CN115420534A - Heat pump unit test system and test method - Google Patents
Heat pump unit test system and test method Download PDFInfo
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- CN115420534A CN115420534A CN202211083198.5A CN202211083198A CN115420534A CN 115420534 A CN115420534 A CN 115420534A CN 202211083198 A CN202211083198 A CN 202211083198A CN 115420534 A CN115420534 A CN 115420534A
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- 238000012360 testing method Methods 0.000 title claims abstract description 351
- 238000010998 test method Methods 0.000 title claims description 5
- 239000002918 waste heat Substances 0.000 claims abstract description 106
- 238000007599 discharging Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 959
- 239000000498 cooling water Substances 0.000 claims description 218
- 230000001105 regulatory effect Effects 0.000 claims description 146
- 238000001816 cooling Methods 0.000 claims description 105
- 230000017525 heat dissipation Effects 0.000 claims description 58
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- 238000006243 chemical reaction Methods 0.000 claims description 32
- 230000033228 biological regulation Effects 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 23
- 238000005057 refrigeration Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 238000007710 freezing Methods 0.000 claims description 12
- 230000008014 freezing Effects 0.000 claims description 12
- 230000001502 supplementing effect Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 7
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000011056 performance test Methods 0.000 description 17
- 238000004891 communication Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000009834 vaporization Methods 0.000 description 4
- 230000008016 vaporization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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Abstract
The invention belongs to the field of heat pump unit testing, and particularly relates to a heat pump unit testing system and a heat pump unit testing method, which comprise the following steps: the system comprises a cold quantity testing system, a cold and heat quantity exchanging system, a heat quantity testing system, a constant pressure system, a heat quantity adjusting system and a waste heat discharging system. The system comprises a cold quantity testing system, a heat quantity testing system, a cold quantity exchanging system, a heat quantity adjusting system, a waste heat discharging system and a heat quantity testing system, wherein the cold quantity testing system and the heat quantity testing system are used for measuring various performance parameters of the heat pump unit, the cold quantity exchanging system is used for exchanging cold quantity and heat quantity in the cold quantity testing system and the heat quantity testing system, the heat quantity adjusting system maintains the temperature of the heat quantity adjusting system by using waste heat which is not exchanged with the cold quantity, the waste heat is used for ensuring that the tested heat pump unit is always in a starting state in the test, the constant pressure system is used for maintaining the pressure required by a pipeline in the heat quantity testing system, and the waste heat discharging system is used for discharging waste heat which cannot be used in the testing system. The invention solves the problems of large test investment and low general degree of the heat pump unit, reduces the energy consumption, reduces the thermal pollution and protects the environment.
Description
Technical Field
The invention belongs to the field of heat pump unit testing, and particularly relates to a heat pump unit testing system and a heat pump unit testing method.
Background
Heat pump systems find application in many industrial fields, particularly when processes require both cooling and heating, heat pump systems can provide efficient solutions; in addition, the heat pump system provides an important means for industrial waste heat recovery, and has a wide development prospect.
The common water source heat pump unit and the common ground source heat pump unit in the heat pump system are used as effective energy-saving means, and various industrial waste water, underground water and the like can be used as heat sources for heating or discharging heat to underground water, lakes and the like for refrigeration. Due to the outstanding advantages of the two types of heat pump units, people pay more and more attention to the performance of the two types of heat pump units, and the performance of the heat pump units is required to be tested no matter the type is selected or the unit performance is optimized. At present, the performance test of a heat pump unit is usually performed by adjusting an external cold source or heat source test unit according to the actual condition of the heat pump unit and the working condition required by the test.
However, in the actual testing process, the increase and decrease and function debugging of peripheral testing equipment must be carried out according to the specific conditions of the heat pump unit and the test in each performance test, the general degree is low, the investment is large, the operation cost is high, and the problems of heat emission to the surrounding environment and environmental pollution exist in the testing period.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a heat pump unit testing system which can more conveniently, efficiently and widely carry out the performance test of a water source/ground source heat pump unit and simultaneously reduce the thermal pollution to the surrounding environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a heat pump set test system, this system includes cold volume test system I, heat test system III and the waste heat discharge system VI who discharges the surplus heat in the test system that carries out performance test to heat pump set, still includes cold heat exchange system II, II one end intercommunication cold volume test system I of cold heat exchange system, other end intercommunication heat test system III, cold heat exchange system II is arranged in exchanging whole cold capacities in the cold volume test system I with the heat in the heat test system III.
Preferably, the cold quantity testing system I comprises a chilled water circulation pipeline penetrating through the evaporator EV of the heat pump unit, and a chilled water flowmeter 12 and a chilled water pump 11 which are arranged on a chilled water inlet pipeline penetrating through the evaporator EV of the heat pump unit, wherein the water outlet end of the chilled water pump 11 is communicated with the water inlet end of the chilled water flowmeter 12, a temperature sensor T3 and a water pressure sensor P3 are both arranged on a chilled water outlet pipeline close to the evaporator EV of the heat pump unit, and a temperature sensor T4 and a water pressure sensor P4 are both arranged on a chilled water inlet pipeline close to the evaporator EV of the heat pump unit; the heat testing system III comprises a cooling water circulation pipeline penetrating through the condenser CO of the heat pump unit, and a cooling water flowmeter 32 and a cooling water pump 31 which are arranged on a cooling water inlet pipeline penetrating through the condenser CO of the heat pump unit, wherein the water outlet end of the cooling water pump 31 is communicated with the water inlet end of the cooling water flowmeter 32, a temperature sensor T1 and a water pressure sensor P1 are both arranged on the cooling water inlet pipeline close to the condenser CO of the heat pump unit, and a temperature sensor T2 and a water pressure sensor P2 are both arranged on the cooling water outlet pipeline close to the condenser CO of the heat pump unit; the heat testing system III is communicated with the waste heat discharging system VI through a heat adjusting system V, the heat adjusting system V is used for collecting part of waste heat which cannot be exchanged between the cold and heat exchanging system II and all cold generated in the cold and heat testing system I in the heat testing system III, part of the waste heat is used for maintaining the temperature of the heat adjusting system V, and the rest of the waste heat is discharged to the environment through the waste heat discharging system VI.
Preferably, the cold and heat exchange system ii comprises a first heat exchanger 22, a freezing side heat exchange water pump 21 and a water mixing pump 23, wherein a water inlet end of the freezing side heat exchange water pump 21 is communicated with a chilled water outlet pipeline penetrating through an evaporator EV of the heat pump unit, a water outlet end of the freezing side heat exchange water pump 21 is communicated with a secondary side water inlet pipeline of the first heat exchanger 22, and a secondary side water outlet pipeline of the first heat exchanger 22 is communicated with a water inlet end of the chilled water pump 11; the water inlet end of the water mixing pump 23 is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, the water outlet end of the water mixing pump 23 is communicated with a primary side water inlet pipeline of the first heat exchanger 22, and the primary side water outlet pipeline of the first heat exchanger 22 is communicated with the water inlet end of the cooling water pump 31;
or, the cold and heat exchange system ii includes a second temperature regulating valve 24, the second temperature regulating valve 24 includes two water inlet ends and one water outlet end, a first water inlet end of the second temperature regulating valve 24 is communicated with a cooling water outlet pipeline penetrating through a heat pump unit condenser CO, a second water inlet end of the second temperature regulating valve 24 is communicated with a chilled water outlet pipeline penetrating through a heat pump unit evaporator EV, a water outlet end of the second temperature regulating valve 24 is communicated with a chilled water inlet pipeline penetrating through the heat pump unit evaporator EV, and a water inlet end of the cooling water pump 31 is further communicated between the second water inlet end of the second temperature regulating valve 24 and the chilled water outlet pipeline penetrating through the heat pump unit evaporator EV; the second temperature regulating valve 24 mixes the water from the first water inlet end with the water from the second water inlet end and the mixed water flows out from the water outlet end of the second temperature regulating valve 24.
Preferably, the heat regulating system v includes a first water supplementing pump 51a, a second heat exchanger 52, a cooling side heat exchange water pump 53, a constant temperature water tank 54, a first heat dissipation water pump 55a, a third heat exchanger 56 and pipelines, a water inlet end of the first water supplementing pump 51a is communicated with a cooling water outlet pipeline penetrating through a condenser CO of a heat pump set, a water outlet end of the first water supplementing pump 51a is communicated with a primary side water inlet pipeline of the second heat exchanger 52, a primary side water outlet pipeline of the second heat exchanger 52 is communicated with a cooling water inlet pipeline at a water inlet end of the cooling water pump 31, a secondary side water inlet pipeline of the second heat exchanger 52 is communicated with a water outlet end of the cooling side heat exchange water pump 53, a secondary side water outlet pipeline of the second heat exchanger 52 is communicated with a water inlet pipeline at a first end of the constant temperature water tank 54, a water inlet end of the cooling side heat exchange water pump 53 is communicated with a water outlet pipeline at a first end of the constant temperature water tank 54, a temperature sensor T6 and a heater 541 are arranged in the constant temperature water tank 54, a water outlet pipeline at a second end of the constant temperature water tank 54 is communicated with a water inlet end of the first heat dissipation water pump 55a water inlet end of the constant temperature heat exchanger, a third heat exchange water outlet pipeline 56 is communicated with a primary side water outlet pipeline of the constant temperature heat exchanger 54;
or, the heat regulating system v includes a second water replenishing pump 51b, a constant temperature water tank 54, a first heat dissipation water pump 55a, a third heat exchanger 56 and a pipeline, a water inlet end of the second water replenishing pump 51b is communicated with a water outlet pipeline at a first end of the constant temperature water tank 54, a water outlet end of the second water replenishing pump 51b is communicated with a cooling water inlet pipeline at a water inlet end of the cooling water pump 31, a water inlet pipeline at a first end of the constant temperature water tank 54 is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, a temperature sensor T6 and a heater 541 are arranged in the constant temperature water tank 54, a water outlet pipeline at a second end of the constant temperature water tank 54 is communicated with a water inlet end of the first heat dissipation water pump 55a, a water outlet end of the first heat dissipation water pump 55a is communicated with a water inlet pipeline at a primary side of the third heat exchanger 56, and a water outlet pipeline at a primary side of the third heat exchanger 56 is communicated with a water inlet pipeline at a second end of the constant temperature water tank 54;
the waste heat discharge system VI comprises a cooling tower water pump 61, a cooling tower 62 and pipelines, wherein a water inlet pipeline of the cooling tower 62 is communicated with a water outlet pipeline on the secondary side of the third heat exchanger 56, a water outlet pipeline of the cooling tower 62 is communicated with a water inlet end of the cooling tower water pump 61, and a water outlet end of the cooling tower water pump 61 is communicated with a water inlet pipeline on the secondary side of the third heat exchanger 56.
Preferably, the heat regulating system v comprises a second water replenishing pump 51b, a constant temperature water tank 54, a second heat dissipation water pump 55b, a temperature sensor T5, a first temperature regulating valve 57 and a pipeline, and the waste heat discharging system vi comprises a cooling tower 62 and a pipeline; the water inlet end of the second water replenishing pump 51b is communicated with a water outlet pipeline at the first end of the constant-temperature water tank 54, the water outlet end of the second water replenishing pump 51b is communicated with a cooling water inlet pipeline at the water inlet end of the cooling water pump 31, a water inlet pipeline at the first end of the constant-temperature water tank 54 is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, and a temperature sensor T6 and a heater 541 are arranged in the constant-temperature water tank 54; the first temperature regulating valve 57 comprises a first water inlet end, a second water inlet end and a water outlet end, a second end water outlet pipeline of the warm water tank 54 is communicated with the first water inlet end of the first temperature regulating valve 57, the water outlet end of the first temperature regulating valve 57 is communicated with the water inlet end of the second heat dissipation water pump 55b, the water outlet end of the second heat dissipation water pump 55b is communicated with a water inlet pipeline of the cooling tower 62, the temperature sensor T5 is arranged on a water inlet pipeline of the cooling tower 62 at the water outlet end of the second heat dissipation water pump 55b, the water outlet pipeline of the cooling tower 62 is communicated with the second water inlet end of the first temperature regulating valve 57, and the second end water inlet pipeline of the warm water tank 54 is communicated between the second water inlet end of the first temperature regulating valve 57 and the water outlet pipeline of the cooling tower 62;
or the heat regulating system v comprises a first water supplementing pump 51a, a second heat exchanger 52, a cooling side heat exchange water pump 53, a constant temperature water tank 54, a second heat dissipation water pump 55b, a temperature sensor T5, a first temperature regulating valve 57 and a pipeline, and the waste heat discharging system vi comprises a cooling tower 62 and a pipeline; a water inlet end of the first water replenishing pump 51a is communicated with a cooling water outlet pipeline penetrating through a condenser CO of a heat pump unit, a water outlet end of the first water replenishing pump 51a is communicated with a primary side water inlet pipeline of the second heat exchanger 52, a primary side water outlet pipeline of the second heat exchanger 52 is communicated with a cooling water inlet pipeline of a water inlet end of the cooling water pump 31, a secondary side water inlet pipeline of the second heat exchanger 52 is communicated with a water outlet end of the cooling side heat exchange water pump 53, a secondary side water outlet pipeline of the second heat exchanger 52 is communicated with a first end water inlet pipeline of the constant temperature water tank 54, a water inlet end of the cooling side heat exchange water pump 53 is communicated with a first end water outlet pipeline of the constant temperature water tank 54, and a temperature sensor T6 and a heater 541 are arranged in the constant temperature water tank 54; the first temperature regulating valve 57 comprises a first water inlet end, a second water inlet end and a water outlet end, a second end water outlet pipeline of the warm water tank 54 is communicated with the first water inlet end of the first temperature regulating valve 57, the water outlet end of the first temperature regulating valve 57 is communicated with the water inlet end of the second heat dissipation water pump 55b, the water outlet end of the second heat dissipation water pump 55b is communicated with a water inlet pipeline of the cooling tower 62, the water inlet pipeline of the cooling tower 62 at the water outlet end of the second heat dissipation water pump 55b is provided with the temperature sensor T5, the water outlet pipeline of the cooling tower 62 is communicated with the second water inlet end of the first temperature regulating valve 57, and the second end water inlet pipeline of the warm water tank 54 is communicated between the second water inlet end of the first temperature regulating valve 57 and the water outlet pipeline of the cooling tower 62.
Preferably, the heat testing system iii is further communicated with a constant pressure system iv, the constant pressure system iv includes a constant pressure tank 41 and a communicating pipeline, and the constant pressure tank 41 is used for performing constant pressure on the pipeline communicated with the constant pressure tank 41; or the constant pressure system iv is a pressure regulating valve 42 and a water pressure sensor P5, the water pressure sensor P5 is disposed on a water inlet pipeline of the cooling water pump 31, and the pressure regulating valve 42 regulates the opening of the valve according to the water pressure sensor P5 to maintain the pressure in the pipeline connected with the pressure regulating valve 42 and the water pressure sensor P5.
The invention also provides a test method of the heat pump unit test system, which can complete the performance test of the heat pump unit more efficiently and in an environment-friendly way. A test method of a heat pump unit test system comprises the following specific steps:
s1, before the test is started, a cooling water circulation pipeline and a chilled water circulation pipeline of a heat test system III and a cold test system I respectively penetrate through a condenser and an evaporator of a heat pump unit to be tested, so that a heat regulation system V conducts heat test to heatSupplying heat to a system III; s2, the temperature of the cooling water in the heat testing system III reaches the starting temperature t 0 When the heat pump unit is started, the heater 541 is turned off, the heat regulating system V stops supplying heat to the heat testing system III, and the test is started; s3, performing constant pressure on a constant pressure system IV; s4, testing the refrigeration performance parameters of the heat pump unit evaporator EV under different working conditions by the refrigeration quantity testing system I, and testing the heating performance parameters of the heat pump unit condenser CO under different working conditions by the heat quantity testing system III; s5, exchanging the cold quantity absorbed by the cold quantity testing system I in the testing process with the heat quantity absorbed by the heat quantity testing system III in the testing process by the cold and heat quantity exchanging system II; s6, the part of waste heat which cannot be exchanged with the cold energy generated in the cold energy testing system I in the heat testing system III in the cold and heat energy exchanging system II to achieve self balance is brought into the heat adjusting system V to provide the heat required by the heat adjusting system V; and S7, the waste heat which cannot be used by the heat regulating system V is brought into the waste heat discharging system VI again and discharged to the environment.
Further preferably, step S1 includes the steps of: s111, a chilled water circulation pipeline in a cold quantity testing system I is arranged on an EV (electric heating) side of a heat pump unit evaporator in a penetrating mode, and a cooling water circulation pipeline in a heat quantity testing system III is arranged on a CO heat supply side of a heat pump unit condenser in a penetrating mode; s112, starting a heater 541 of the constant-temperature water tank 54 in the heat regulating system V to increase the water temperature in the constant-temperature water tank 54; s113, transferring heat in the constant-temperature water tank 54 to a heat testing system III;
the step S2 includes the steps of: s211, when the cooling water inlet temperature t is higher than the water inlet temperature 1 Reaching the starting temperature t of the heat pump unit to be measured 0 When the heat pump unit condenser CO starts to supply heat, and the heat pump unit evaporator EV starts to refrigerate; s212, according to the inlet water temperature t of the cooling water 1 Controlling the heater 541 to start and stop: when t is 1 ≥t 0 When so, the heater 541 is turned off; when t is 1 ＜t 0 When so, the heater 541 is started; the central water temperature T measured by the temperature sensor T6 in the constant temperature water tank 54 6 Is a constant value not lower than t 1 And t 0 The temperature sensor T6 measures the central water temperature of the constant-temperature water tank 54 at the same time;
the step S3 includes the steps of: s311, the constant pressure tank 41 is set to the following pressure values as it is: the pressure value ensures that the cooling water in the pipeline communicated with the constant pressure tank 41 is still in a liquid state when the temperature exceeds 100 ℃;
alternatively, step S3 includes the steps of: s321, the pressure regulating valve 42 measures the pressure value P according to the water pressure sensor P5 5 The valve opening is adjusted according to the size of the pressure sensor, and the pressure of a pipeline in the heat testing system III is maintained;
step S4 includes the following steps: s411, according to different working condition requirements, the chilled water circulating in and out of the heat pump unit evaporator EV is controlled to bring the chilled water into the cold quantity test system I by controlling the chilled water pump 11 through frequency conversion, and the temperature of the chilled water flowing out of the heat pump unit evaporator EV is measured as T by the temperature sensor T3 3 The temperature of the chilled water flowing into the evaporator EV of the heat pump unit is measured by the temperature sensor T4 and is T 4 The water pressure sensor P3 measures the water pressure P of the chilled water flowing out of the evaporator EV of the heat pump unit 3 The water pressure sensor P4 measures the water pressure P of the chilled water flowing into the evaporator EV of the heat pump unit 4 The flow rate of the chilled water circulating in the evaporator EV of the heat pump unit measured by the chilled water flow meter 12 is q 1 The cold quantity generated by the heat pump unit evaporator EV is calculated according to the formula: q EV ＝C 1 ρ 1 q 1 (t 4 -t 3 ) Calculated to obtain, wherein C 1 Is t 4 And t 3 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 1 Is t 4 And t 3 The arithmetic mean value corresponds to the density of water at the temperature; s412, controlling the heat of cooling water circularly flowing in and out of the condenser CO of the heat pump unit and entering the heat test system III by controlling the cooling water pump 31 through frequency conversion according to different working condition requirements, and measuring the water temperature T of the cooling water flowing out of the condenser CO of the heat pump unit by the temperature sensor T2 2 The temperature of the cooling water flowing into the condenser CO of the heat pump unit is measured by the temperature sensor T1 and is T 1 The water pressure sensor P2 measures the water pressure P of the cooling water flowing out of the condenser CO of the heat pump unit 2 The water pressure sensor P1 measures the water pressure P of the cooling water flowing into the condenser CO of the heat pump unit 1 The cooling water measured by the cooling water flow meter 32 circulates in the heat pump unitWater flow of condenser CO is q 2 The heat generated by the condenser CO of the heat pump unit is expressed by the formula: q CO ＝C 2 ρ 2 q 2 (t 2 -t 1 ) Is calculated to obtain, wherein C 2 Is t 2 And t 1 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 2 Is t 2 And t 1 The arithmetic mean value corresponds to the density of water at temperature;
further preferably, step S5 includes the steps of: s511, the refrigeration quantity in the refrigeration quantity testing system I is brought into the secondary side of the first heat exchanger 22 by controlling the refrigeration side heat exchange water pump 21 through frequency conversion; s512, the corresponding heat in the heat testing system III is brought into the primary side of the first heat exchanger 22 through the variable-frequency control water charging pump 23; s513, cold and heat in the first heat exchanger 22 are exchanged, all cold in the cold testing system I and most heat in the heat testing system III are self-balanced in the exchange, and more than half of heat in the heat testing system is defined as most heat;
alternatively, step S5 includes the steps of: s541, the second temperature regulating valve 24 measures the temperature T according to the temperature sensor T4 4 The opening of a valve of the cold testing system is adjusted, so that part of low-temperature chilled water flowing out of the cold testing system I is mixed with high-temperature water flowing into the cold testing system I and then flows into the cold testing system I, part of low-temperature chilled water in the cold testing system I directly flows into the heat maintaining testing system III, all cold in the cold testing system I and most of heat in the heat testing system III reach self balance in exchange, and more than half of heat in the heat testing system is defined as most of heat;
further preferably, steps S6 and S7 include the steps of:
s611, the first water replenishing pump 51a is controlled through frequency conversion to bring the waste heat in the heat testing system III into the primary side of the second heat exchanger 22; s612, controlling the cooling side heat exchange water pump 53 through frequency conversion to enable water in the constant temperature water tank 54 to circularly flow through the secondary side of the second heat exchanger 22, bringing heat on the primary side of the second heat exchanger 22 into the constant temperature water tank 54, and maintaining the water temperature of the constant temperature water tank 54; s613, the first heat dissipation water pump 55a is controlled by frequency conversion to bring the waste heat of the constant temperature water tank 54 that cannot be used into the primary side of the third heat exchanger 56; s711, the waste heat on the primary side of the third heat exchanger 56 is led into the cooling tower 62 through cooling water circularly flowing through the secondary side of the third heat exchanger 56 by controlling the cooling tower water pump 61 through frequency conversion; the cooling tower 62 discharges the waste heat to the ambient environment through evaporative heat dissipation S712.
Alternatively, steps S6 and S7 include the following steps:
s621, the second water replenishing pump 51b brings the constant-temperature water in the constant-temperature water tank 54 into the heat testing system III, mixes the constant-temperature water with cooling water in the heat testing system III, heats the mixture by a condenser CO of a heat pump unit, and then flows back into the constant-temperature water tank 54; s622, the first heat dissipation water pump 55a is controlled by frequency conversion to bring the waste heat of the constant temperature water tank 54 that cannot be used into the primary side of the third heat exchanger 56; s721, the waste heat on the primary side of the third heat exchanger 56 is led into the cooling tower 62 through the cooling water which circularly flows through the secondary side of the third heat exchanger 56 by controlling the water pump 61 of the cooling tower through frequency conversion; the cooling tower 62 discharges the waste heat to the ambient environment through evaporative heat dissipation S722.
Alternatively, steps S6 and S7 include the steps of:
s631, the second water replenishing pump 51b brings the constant-temperature water in the constant-temperature water tank 54 into the heat testing system III, mixes the constant-temperature water with the cooling water in the heat testing system III, heats the mixture by the condenser CO of the heat pump unit, and then flows back into the constant-temperature water tank 54; s632, directly introducing waste heat which cannot be used by the constant-temperature water tank 54 into a waste heat discharge system VI through controlling the second heat dissipation water pump 55b through frequency conversion; s633, mixing part of low-temperature cooling water flowing out of the waste heat discharge system VI with high-temperature cooling water flowing into the waste heat discharge system VI by the first temperature regulating valve 57, and reducing the temperature of water directly flowing into the waste heat discharge system VI; s731, the cooling water mixed by the first temperature adjusting valve 57 directly brings the waste heat into the cooling tower 62, and discharges to the surrounding environment.
The invention has the beneficial effects that:
(1) The heat and the cold generated in the heat pump unit test are exchanged through the cold and heat exchange system, so that the cold heat self-balance in the system is achieved, the heat and the cold generated in the test are effectively recycled and put into the test system again, the cold test system and the heat test system do not need to be additionally supplied with heat and cooled, the energy consumption is reduced, and the waste heat discharged to the environment is also reduced.
(2) When the detected heat pump unit stops working due to too low temperature, the heat regulating system can supply heat to the heat pump unit to start the heat pump unit; when the test is carried out, the heat regulating system can also regulate the waste heat which cannot be self-balanced with the cold quantity in the test system, and a part of the waste heat is used for maintaining the temperature of the heat regulating system, so that the heat pump unit is ensured to be always in a starting state in the test process, the test process is more stable, the test data is more accurate, meanwhile, the waste heat discharged to the environment is further reduced, and the operation cost is reduced.
(3) The constant pressure system of the invention ensures that the test object of the test system of the invention not only can be a common water source/ground source heat pump unit, but also can test a high-temperature heat pump unit; the constant pressure system enables the cooling water circulating in the heat testing system to be always kept in a liquid state through pressurization, the testing cannot be influenced due to vaporization of the cooling water circulating in the heat testing system caused by high temperature, the testing object is wider, and the testing system is high in universality.
(4) The testing system integrates a plurality of devices and pipelines into a whole, the testing can be started only by respectively penetrating the cooling water circulation pipeline and the chilled water circulation pipeline of the heat testing system and the cold testing system into the condenser and the evaporator of the tested heat pump unit, and the testing equipment does not need to be re-arranged and the function debugging does not need to be carried out according to different heat pump units, so that the operation is simple, and the investment cost is reduced.
(5) After the heat pump unit is communicated with the test system, variables such as water flow speed and the like can be flexibly adjusted, tests of different working conditions (such as refrigeration, heating and the like) are carried out, test contents are more comprehensive, and test efficiency is higher.
(6) The heat transfer device can be an indirect heat transfer heat exchanger, and the heat loss in the heat transfer process ensures that the heat transfer process is safer; the heat exchanger and the corresponding water pump can be optimized, the pipelines are directly communicated, heat transfer is carried out by heat convection, the temperature regulating valve is arranged on the pipeline of the device needing temperature protection, the system is simplified, and safety and operation efficiency are also considered while the heat transfer efficiency is higher.
Drawings
FIG. 1 is a schematic structural diagram of a first heat pump unit test system according to the present invention;
FIG. 2 is a schematic structural diagram of a second heat pump unit test system according to the present invention;
FIG. 3 is a schematic structural view of a third heat pump unit test system according to the present invention;
FIG. 4 is a schematic structural diagram of a fourth heat pump unit test system according to the present invention;
FIG. 5 is a schematic view of the flow of water in the thermal test system III of FIG. 1 and its surrounding communication lines;
FIG. 6 is a schematic view of the flow of water in the thermal test system III of FIG. 2 and its surrounding communication lines;
FIG. 7 is a schematic view showing the flow direction of water in a communication pipeline between the thermal regulation system V and the waste heat discharge system VI in FIG. 3;
fig. 8 is a schematic view of the flow direction of the water in the communication pipeline of the cold testing system i and the cold and heat exchanging system ii in fig. 4;
FIG. 9 is a schematic diagram of a module configuration of a heat pump unit testing system corresponding to FIGS. 1-3 according to the present invention;
FIG. 10 is a schematic diagram of a heat pump unit test system module according to FIG. 4;
the actual correspondence between each label and the part name of the invention is as follows:
i, a cold quantity testing system; II-a cold heat exchange system; III-thermal test system; IV-a constant pressure system; v-a thermal regulation system; VI-a waste heat discharge system; 11. a chilled water pump; 12. a chilled water flow meter; 21. a refrigeration side heat exchange water pump; 22. a first heat exchanger; 23. adding a water pump; 24. a second temperature regulating valve; 31. a cooling water pump; 32. a cooling water flow meter; 41. a constant pressure tank; 42. a pressure regulating valve; 51a, a first water replenishing pump; 51b, a second water replenishing pump; 52. a second heat exchanger; 53. a cooling side heat exchange water pump; 54. a constant temperature water tank; 541. a heater; 55a, a first heat-radiating water pump; 55b, a second heat-radiating water pump; 56. a third heat exchanger; 57. a first temperature regulating valve; 61. a cooling tower water pump; 62. a cooling tower; T1-T6-temperature sensor; P1-P5-water pressure sensor; a CO-heat pump unit condenser; an EV-heat pump unit evaporator;
Detailed Description
In order to make the technical scheme of the present invention clearer and clearer, the present invention is described clearly and completely with reference to the attached drawings, and the technical features of the technical scheme of the present invention are equivalent and are deduced by a person skilled in the art without creative efforts to obtain the scheme which falls into the protection scope of the present invention.
Example 1
The invention discloses a heat pump unit test system, wherein a subsystem comprises: the system comprises a cold quantity testing system I, a cold and heat quantity exchanging system II, a heat quantity testing system III, a constant pressure system IV, a heat quantity adjusting system V and a waste heat discharging system VI.
The evaporator EV of the heat pump unit to be tested is communicated with the condenser CO of the heat pump unit through a compressor in the heat pump unit, and the like, and the part is omitted in the figure of the invention; in order to make the drawings clearer, an evaporator EV and a condenser CO of the heat pump unit to be tested are listed separately; the tested heat pump unit is a water source heat pump unit or a ground source heat pump unit. In addition, the electric energy for driving the heat pump unit compressor to work can be converted into part of the heat produced by the heat pump unit condenser CO, so that the heat produced by the heat pump unit condenser CO in the running process of the heat pump unit condenser CO heat pump system is greater than the cold produced by the heat pump unit evaporator EV.
The constitution of each subsystem in the invention is not unique, and the communication is selected by designers according to the actual situation, and the concrete constitution, the communication mode and the working process of each system are explained as follows:
1. cold volume test system I
The cold quantity test system I is used for measuring various performance parameters of the heat pump unit evaporator EV.
The specific composition is shown in fig. 1, and the cold testing system i in fig. 2, 3 and 4 is the same as that in fig. 1. The cold quantity testing system I comprises a chilled water pump 11, a chilled water flowmeter 12, temperature sensors T3-T4, water pressure sensors P3-P4 and a chilled water circulating pipeline. The chilled water circulation pipeline is internally circulated with chilled water and is an independent pipeline, and the chilled water circulation pipeline is arranged in the heat pump unit evaporator EV in a penetrating manner; the chilled water flowing through the heat pump unit evaporator EV absorbs the cold energy generated by the heat pump unit evaporator EV and brings the cold energy back to the cold energy testing system I. The chilled water flowmeter 12 is arranged on a chilled water inlet pipeline of an evaporator EV of the heat pump unit; the chilled water pump 11 is a variable frequency water pump, is arranged on a chilled water inlet pipeline of the heat pump unit evaporator EV and is used for providing water circulation power in the cold quantity testing system I, and a water outlet end of the chilled water pump is communicated with a water inlet end of the chilled water flowmeter 12; the temperature sensor T3 and the water pressure sensor P3 are both arranged on a chilled water outlet pipeline close to an evaporator EV of the heat pump unit; and the temperature sensor T4 and the water pressure sensor P4 are both arranged on a chilled water inlet pipeline close to an evaporator EV of the heat pump unit.
When the performance test of the heat pump unit is carried out, the evaporator EV of the heat pump unit continuously generates cold, the chilled water flowing through the evaporator EV of the heat pump unit absorbs the cold generated by the evaporator EV of the heat pump unit, namely, the temperature sensor T4 arranged on the chilled water inlet pipeline close to the evaporator EV of the heat pump unit measures the inlet water temperature T of the chilled water 4 The water pressure sensor P4 measures the water pressure P of the inlet chilled water 4 (ii) a The chilled water outlet temperature T is measured by a temperature sensor T3 arranged on a chilled water outlet pipeline close to an evaporator EV of the heat pump unit 3 The water pressure sensor P3 measures the water outlet pressure P of the chilled water 3 (ii) a The chilled water flow meter 12 measures the chilled water flow rate q 1 (ii) a Wherein, t is inevitable 4 ＞t 3 . The refrigerating capacity brought into the refrigerating capacity testing system I from the heat pump unit evaporator EV is controlled by controlling the refrigerating water pump 11 through frequency conversion, and the flow q of circulating refrigerating water is changed 1 And the inlet and outlet water pressure p of the chilled water 4 、p 3 Will indirectly change the inlet and outlet water temperature t of the chilled water 4 、t 3 The performance test of the heat pump unit evaporator EV can be realized under different conditions.
The formula for calculating the cooling capacity generated by the heat pump unit evaporator EV is as follows: q EV ＝C 1 ρ 1 q 1 (t 4 -t 3 )；
Wherein Q EV Cold energy generated by heat pump set evaporator EV 1 Is t 4 And t 3 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 1 Is t 4 And t 3 The arithmetic mean corresponds to the density of water at temperature, q 1 For the water flow rate, t, measured by the chilled water flow meter 12 3 Is the temperature, T, measured by the temperature sensor T3 4 Is the temperature measured by the temperature sensor T4.
2. Cold and heat exchange system II
The cold and heat exchange system II is used for exchanging the cold quantity absorbed by the cold quantity testing system I in the testing process with the heat absorbed by the heat testing system III in the testing process; all cold quantity and most heat quantity brought into the cold and heat quantity exchange system II are balanced in a self-balancing manner, and no extra heat supply or refrigerating unit is needed to maintain the stable operation of the cold quantity test system I and the heat quantity test system III; here, "most of the heat" means the amount of heat equal to the amount of cold, and "most of the heat" means more than half of the amount of heat in the heat test system iii.
2.1 Cold-Heat exchange System II with a first Heat exchanger 22
As shown in fig. 1, the cold and heat exchange system ii includes a freezing side heat exchange water pump 21, a first heat exchanger 22, a water mixing pump 23, and heat exchange pipelines, where the heat exchange pipelines in the system include a primary side pipeline and a secondary side pipeline of the first heat exchanger 22, and the two side pipelines are independent and not communicated with each other. The structure of the heat and heat exchange system ii in fig. 2 and 3 is the same as that in fig. 1.
A chilled water outlet pipeline penetrating through an evaporator EV of the heat pump unit is communicated with a water inlet end of a freezing side heat exchange water pump 21, and a water outlet end of the freezing side heat exchange water pump 21 is communicated with a water inlet pipeline on the secondary side of a first heat exchanger 22; and a water outlet pipeline on the secondary side of the first heat exchanger 22 is communicated with a water inlet end of the chilled water pump 11. The refrigeration side heat exchange water pump 21 is a variable frequency water pump and is used for bringing cold energy brought by the cold energy testing system I from the heat pump unit evaporator EV into the secondary side of the first heat exchanger 22.
The water inlet end of the water mixing pump 23 is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, and the water outlet end of the water mixing pump 23 is communicated with a primary side water inlet pipeline of the first heat exchanger 22; the primary side water outlet pipeline of the first heat exchanger 22 is communicated with the water inlet pipeline of the cooling water pump 31. The water mixing pump 23 is a variable frequency water pump and is used for bringing heat brought by the heat testing system III from the condenser CO of the heat pump unit into the primary side of the first heat exchanger 22. The refrigerating side heat exchange water pump 21 is controlled through frequency conversion to control the refrigerating capacity brought into the secondary side of the first heat exchanger 22 from the refrigerating capacity testing system I, the heat brought into the primary side of the first heat exchanger 22 from the heat testing system III is controlled through frequency conversion to control the water charging pump 23, the heat generated in the heat testing system III is more than the refrigerating capacity of the refrigerating capacity testing system I, namely all refrigerating capacity of the refrigerating capacity testing system I and most heat of the heat testing system III are exchanged in the first heat exchanger 22, and the self-balance of the refrigerating capacity in the testing system is achieved.
2.2 Cold-Heat exchange System II with a second temperature control valve 24
As shown in fig. 4, the cold and heat exchanging system ii includes a second temperature adjusting valve 24, and a first heat exchanging pipeline and a second heat exchanging pipeline.
As shown in fig. 8, the second temperature control valve 24 includes two water inlet ends, i.e., an end a, an end B2, and an end AB 2. Chilled water outlet pipeline that wears to locate in heat pump set evaporimeter EV communicates with the B2 end of second temperature regulating valve 24 mutually, and the chilled water outlet pipeline that wears to locate in heat pump set evaporimeter EV still is linked together with the B1 branch road, and the chilled water outlet pipeline that wears to locate in heat pump set evaporimeter EV promptly marks as the B way, and the B way is divided into two tunnel, flows into the B1 branch road all the way, flows into the B2 end all the way. The branch B1 is communicated with a cooling water inlet pipeline penetrating through a CO end of a condenser of the heat pump unit in the heat testing system III, and the section of the water inlet pipeline is positioned at a water inlet end of the cooling water pump 31. A water inlet pipeline of the cooling water pump 31 is also communicated with a chilled water outlet pipeline penetrating through the heat pump unit evaporator EV; a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit is communicated with the A end of the second temperature regulating valve 24; the AB2 end of the second temperature regulating valve 24 is arranged in the heat pump in a penetrating wayAnd chilled water inlet pipelines in the unit evaporator EV are communicated. The valve opening of the second temperature regulating valve 24 can mix the water inlet at the A end and the water inlet at the B2 end according to different proportions and then flow out from the AB2 end, so that the purpose of changing the water outlet temperature of the AB2 end is achieved. Wherein, the temperature of water entering from the A end is higher than that of water entering from the B2 end, the temperature of water entering from the B2 end is higher than that of water entering from the AB2 end, and the temperature of water in the B path is lower than that of water exiting from the AB2 end. The opening of the second temperature regulating valve 24 is adjusted according to the temperature T measured by the temperature sensor T4 4 The adjustment is carried out, so that the temperature of water flowing into the cold quantity testing system I is not too high, and the normal operation of the heat pump unit evaporator EV is ensured.
The heat and cold exchange system ii shown in fig. 4 does not exchange heat and cold through the first heat exchanger 22 in which the primary side and the secondary side are not communicated, but the second temperature adjustment valve 24 and the heat exchange pipeline which are communicated are directly subjected to heat convection to exchange heat. Compared with a cold and heat exchange system II with the first heat exchanger 22, the freezing side heat exchange water pump 21 and the water mixing pump 23 are optimized, only the second temperature adjusting valve 24 is added, the system structure is simplified, and the heat transfer efficiency between the heat testing system III and the cold testing system I is improved.
3. Heat testing system III
And the heat testing system III is used for measuring various performance parameters of the condenser CO of the heat pump unit.
The specific composition is shown in fig. 1, and the heat testing system iii in fig. 2, 3 and 4 is the same as fig. 1. The heat testing system III comprises a cooling water pump 31, a cooling water flowmeter 32, temperature sensors T1-T2, water pressure sensors P1-P2 and a cooling water circulating pipeline.
Cooling water circulates in the cooling water circulation pipeline and is an independent pipeline, and the heat testing system III tests various heating performance parameters of the condenser CO of the heat pump unit through the cooling water circulation pipeline penetrating in the condenser CO of the heat pump unit; the cooling water flowing through the heat pump unit condenser CO absorbs the heat generated by the heat pump unit condenser CO and brings this heat back into the heat test system iii. The cooling water flow meter 32 is arranged on a cooling water inlet pipeline in a condenser CO of the heat pump unit; the cooling water pump 31 is a variable frequency water pump, is also arranged on a cooling water inlet pipeline of a heat pump unit condenser CO and is used for providing power for water circulation in the heat test system III, and the water outlet end of the cooling water pump is communicated with the water inlet end of the cooling water flowmeter 32; the temperature sensor T1 and the water pressure sensor P1 are both arranged on a cooling water inlet pipeline close to a condenser CO of the heat pump unit; the temperature sensor T2 and the water pressure sensor P2 are both arranged on a cooling water outlet pipeline close to a condenser CO of the heat pump unit.
When the performance test of the heat pump unit is carried out, the condenser CO of the heat pump unit continuously generates heat, the cooling water flowing through the condenser CO of the heat pump unit absorbs the heat generated by the condenser CO of the heat pump unit, namely, the temperature sensor T1 arranged on the cooling water inlet pipeline close to the condenser CO of the heat pump unit measures the inlet water temperature T of the cooling water 1 The water pressure sensor P1 measures the water pressure P of the cooling water 1 (ii) a The temperature sensor T2 arranged on the cooling water outlet pipeline close to the condenser CO of the heat pump unit measures the outlet water temperature T of the cooling water 2 The water pressure P of the cooling water outlet is measured by the water pressure sensor P2 2 (ii) a The cooling water flow rate q measured by the cooling water flow meter 32 2 (ii) a Wherein, t is inevitable 2 ＞t 1 . The cooling water pump 31 is controlled through frequency conversion to control the heat brought from the condenser CO of the heat pump unit into the heat test system III, and the flow q of the cooling water is changed 2 And the cooling water inlet and outlet water pressure p 1 、p 2 Will indirectly change the temperature t of the cooling water inlet and outlet 1 、t 2 The performance test of the condenser CO of the heat pump unit can be carried out under different conditions.
The heat quantity calculation formula generated by the condenser CO of the heat pump unit is as follows: q CO ＝C 2 ρ 2 q 2 (t 2 -t 1 )
Wherein Q is CO Heat generated by condenser CO of heat pump unit, C 2 Is t 2 And t 1 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 2 Is t 2 And t 1 The arithmetic mean corresponds to the density of water at temperature, q 2 For cooling the water flow, t, measured by the water flow meter 32 1 Is the temperature, T, measured by the temperature sensor T1 2 Is temperatureThe temperature measured by sensor T2.
4. Constant pressure system IV
And the constant pressure system IV performs constant pressure on a pipeline communicated with the constant pressure system IV, and ensures that cooling water in the heat testing system III is still in a liquid state when the temperature is higher than 100 ℃.
4.1 constant pressure System IV with constant pressure tank 41
As shown in fig. 1, the constant pressure system iv includes a constant pressure tank 41 and a communication pipe. The constant pressure tank 41 is communicated with a cooling water circulation pipeline of the heat testing system III through a communication pipeline, and specifically, the communication pipeline of the constant pressure tank 41 is communicated with the water inlet end of the cooling water pump 31.
When the performance test is carried out on the water source high-temperature heat pump unit, the highest temperature of cooling water in the heat test system III may exceed 100 ℃, and the vaporization pressure of the cooling water is increased due to the temperature rise, so in order to ensure that the cooling water is still liquid under the condition of exceeding 100 ℃, the cooling water needs to be pressurized. The heat pump unit test system can directly set the constant pressure tank 41 to be a high pressure value (larger than a standard atmospheric pressure), so that parameters of the constant pressure tank 41 do not need to be continuously adjusted due to different vaporization pressures even if different high-temperature heat pump units are tested subsequently. Therefore, the test system can also test the water source/ground source high-temperature heat pump unit.
4.2 constant pressure System IV with pressure regulating valve 42
As shown in fig. 2, the constant pressure system iv includes a pressure regulating valve 42, a water pressure sensor P5, and a communication line, and the constant pressure system iv in fig. 3 and 4 is the same as that in fig. 2.
The water pressure sensor P5 is arranged on a cooling water inlet pipeline at the water inlet end of the cooling water pump 31, the water inlet end of the pressure regulating valve 42 is communicated with the water outlet end of the cooling water circulation pipeline, and the water outlet end of the pressure regulating valve 42 is communicated with a first water inlet pipeline of the constant-temperature water tank. According to the water pressure P measured by the water pressure sensor P5 5 The valve opening of the pressure regulating valve 42 is controlled by the size, so that the cooling water in the cooling water circulation pipeline of the heat testing system III still keeps liquid even if the temperature is over 100 ℃, and the test cannot be influenced by vaporization.
5. Heat regulating system V
Before heat pump set performance test begins, heat regulation system V supplies heat to heat pump set performance test system III, makes the cooling water that wears to locate in the cooling water circulation pipeline in heat pump set condenser CO heat rise, when reaching the heat pump set starting temperature of being surveyed by heat pump set condenser CO end, is surveyed heat pump set and starts, and simultaneously, heat regulation system V stops supplying heat to heat pump set performance test system III, and heat pump set performance test begins. After the performance test of the heat pump unit is started, the part of waste heat which cannot be exchanged with the cold energy generated in the cold energy testing system I in the heat testing system III to achieve self balance in the cold and heat energy exchanging system II enters the heat regulating system V, and one part of waste heat is used for maintaining the temperature of the heat regulating system V and is not lower than the temperature of the corresponding heat regulating system V when the heat pump unit to be tested is started so as to keep the heat pump unit to be tested in the running state; another portion of the waste heat that is not needed is sent to a waste heat removal system vi.
5.1 Heat Conditioning System V with a second Heat exchanger 52 and a third Heat exchanger 56
As shown in fig. 1, the heat regulating system v includes a first water replenishing pump 51a, a second heat exchanger 52, a cooling-side heat exchange water pump 53, a constant-temperature water tank 54, a heater 541, a temperature sensor T6, a first heat-dissipation water pump 55a, a third heat exchanger 56, and a circulation line. The circulating pipeline in the system comprises a primary side pipeline and a secondary side pipeline of a second heat exchanger 52, a primary side pipeline and a secondary side pipeline of a third heat exchanger 56, a water inlet and outlet pipeline at a first end of a constant-temperature water tank 54 and a water inlet and outlet pipeline at a second end of the constant-temperature water tank 54; different side pipelines of the same heat exchanger are mutually independent and are not communicated with each other.
The water inlet end of the first water replenishing pump 51a is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit; the water outlet end of the first water replenishing pump 51a is communicated with a primary side water inlet pipeline of the second heat exchanger 52; the first water replenishing pump 51a is a variable frequency water pump and is used for bringing the part of the residual heat which cannot be exchanged with the cold energy generated in the cold energy testing system I in the heat testing system III in the cold and heat exchanging system II to achieve self balance into the primary side of the second heat exchanger 52. The primary side water outlet pipeline of the second heat exchanger 52 is communicated with the cooling water inlet pipeline at the water inlet end of the cooling water pump 31. And a secondary side water inlet pipeline of the second heat exchanger 52 is communicated with a water outlet end of the cooling side heat exchange water pump 53, and a secondary side water outlet pipeline of the second heat exchanger 52 is communicated with a first end water inlet pipeline of the constant temperature water tank 54. The water inlet end of the cooling side heat exchange water pump 53 is communicated with the water outlet pipeline at the first end of the constant temperature water tank 54, and the cooling side heat exchange water pump 53 is a variable frequency water pump and is used for providing power for enabling water in the constant temperature water tank 54 to circulate between the constant temperature water tank 54 and the secondary side of the second heat exchanger 52. The waste heat of the secondary side of the second heat exchanger 52 is carried into the constant temperature water tank 54, and the temperature of the constant temperature water tank 54 is maintained at a constant value by the waste heat.
A heater 541 and a temperature sensor T6 are arranged in the constant-temperature water tank 54, a second-end water outlet pipeline of the constant-temperature water tank 54 is communicated with a water inlet end of the first heat dissipation water pump 55a, a water outlet end of the heat dissipation water pump 55 is communicated with a primary-side water inlet pipeline of the third heat exchanger 56, and a primary-side water outlet pipeline of the third heat exchanger 56 is communicated with a second-end water inlet pipeline of the constant-temperature water tank 54. The first heat-dissipation water pump 55a is a variable-frequency water pump, and is configured to provide power for circulating water in the constant-temperature water tank 54 between the constant-temperature water tank 54 and the primary side of the third heat exchanger 56, so as to bring waste heat that cannot be used by the constant-temperature water tank 54 into the primary side of the third heat exchanger 56, and the waste heat at the primary side of the third heat exchanger 56 is heat-exchanged to the secondary side. During the testing process of the heat pump unit testing system, the heater 541 is turned off.
5.2 Heat regulating System V with third Heat exchanger 56
As shown in fig. 2, the heat quantity adjusting system v includes a second water replenishing pump 51b, a constant temperature water tank 54, a heater 541, a temperature sensor T6, a first heat dissipation water pump 55a, a third heat exchanger 56, and a circulation line. The circulating pipeline in the system comprises a primary side pipeline and a secondary side pipeline of a third heat exchanger 56, a water inlet and outlet pipeline at a first end of a constant-temperature water tank 54 and a water inlet and outlet pipeline at a second end of the constant-temperature water tank 54; the pipelines on different sides of the third heat exchanger 56 are independent and not communicated with each other.
The second water replenishing pump 51b is a power frequency water pump, the water inlet end of which is communicated with the water outlet pipeline at the first end of the constant temperature water tank 54, and the water outlet end of which is communicated with the cooling water inlet pipeline at the water inlet end of the cooling water pump 31; and a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit is communicated with a water inlet pipeline at the first end of the constant temperature water tank 54. The second water replenishing pump 51b is used for providing power, in the testing process of the heat pump unit testing system, the water in the constant temperature water tank 54 is taken into the heat testing system III to be mixed with the cooling water in the cooling water circulation pipeline, then the water is absorbed by the CO end of the condenser of the heat pump unit, and finally the part of waste heat which cannot be exchanged with the cooling capacity generated in the cooling capacity testing system I in the heat testing system III in the cold and heat exchange system II to achieve self balance is taken back into the constant temperature water tank 54 through the water circulation pipeline, and the temperature of the constant temperature water tank 54 is maintained at a constant value by the waste heat.
The connection modes of the heater 541 and the temperature sensor T6 arranged in the constant-temperature water tank 54, the first heat-dissipation water pump 55a connected to the water inlet and outlet pipeline at the second end of the constant-temperature water tank 54, the third heat exchanger 56, and the circulation pipeline are the same as those of the heat regulating system v with the second heat exchanger 52 and the third heat exchanger 56 in fig. 5.1, and details thereof are omitted here.
Compared with the heat regulating system V with the second heat exchanger 52 and the third heat exchanger 56 in the 5.1, the heat regulating system V with the third heat exchanger 56 does not exchange heat through the second heat exchanger 52 of which the primary side and the secondary side are not communicated, and correspondingly, the cooling side heat exchange water pump 53 is also removed; but the constant temperature water tank 54 is directly communicated with the heat testing system III, the first water replenishing pump 51a is adjusted to the second water replenishing pump 51b, heat is exchanged through heat convection, the system structure is simplified, and the heat exchange efficiency is improved.
5.3 Heat regulating System V with first temperature regulating valve 57
As shown in fig. 3 or 4, the heat quantity adjusting system v includes a second water replenishing pump 51b, a constant temperature water tank 54, a heater 541, a temperature sensor T6, a second heat-radiating water pump 55b, a temperature sensor T5, a first temperature adjusting valve 57, and a circulation line.
The connection mode between the water inlet and outlet pipeline at the first end of the constant-temperature water tank 54 and the heat test system iii and the internal arrangement of the constant-temperature water tank 54 are the same as those of the heat regulation system v with the third heat exchanger 56 in 5.2, and are not described again here.
As shown in fig. 7, the first temperature control valve 57 includes two water inlet ends, i.e., an end a, an end B2, and an end AB 2. The outlet pipe of the second end of the constant temperature water tank 54 is connected to the end a of the first temperature regulating valve 57, the inlet pipes of the end B2 of the first temperature regulating valve 57 and the second end of the constant temperature water tank 54 are both connected to the outlet pipe of the cooling tower 62, i.e. the second inlet end of the constant temperature water tank 54 is marked as the end B1, the outlet pipe of the cooling water pump 62 is marked as the path B, which is divided into two branches, one of which flows into the end B2, and the other of which flows into the end B1. The valve opening of the first temperature adjusting valve 57 can mix the water entering from the end A and the water entering from the end B2 according to different proportions and then flow out from the end AB2, namely, the purpose of changing the water temperature of the end AB2 is achieved, the temperature of the end A is higher than that of the end AB2, and the temperature of the end AB2 is higher than that of the end B. The AB2 end of the first temperature regulating valve 57 is communicated with the water inlet end of the second heat dissipation water pump 55b, and the water outlet end of the second heat dissipation water pump 55b is communicated with the water inlet pipeline of the cooling tower 62 in the waste heat discharge system VI; the second heat-radiating water pump 55b is a variable-frequency water pump for supplying power for circulating the water in the constant-temperature water tank 54 between the constant-temperature water tank 54 and the cooling tower 62. A temperature sensor T5 is provided on the water inlet line between the second heat-radiating water pump 55b and the cooling tower 62 for detecting the temperature of the water flowing into the cooling tower 62, and the temperature of the water detected by the temperature sensor T5 is denoted as T 5 The valve opening of the first temperature regulating valve 57 is according to t 5 Is adjusted to ensure t 5 Below 55 deg.C, the water temperature flowing directly into the cooling tower 62 is not too high.
Compared with the heat regulating system V with the third heat exchanger 56 in the step 5.2, the heat regulating system V with the first temperature regulating valve 57 optimizes the third heat exchanger 56, further simplifies the system and improves the heat transfer efficiency of waste heat from the constant-temperature water tank 54 to the cooling tower 62; meanwhile, a first temperature regulating valve 57 and a temperature sensor T5 are additionally arranged, and the first temperature regulating valve 57 measures the water temperature T according to the temperature sensor T5 5 The valve opening degree is adjusted, so that the water inlet temperature of the cooling tower 62 is not too high while the heat is efficiently transferred, and the heat dissipation effect and the safe operation of the cooling tower 62 are ensured.
5.4 Heat regulating System V with second Heat exchanger 52 and first temperature regulating valve 57
The heat regulating system v includes a first water replenishing pump 51a, a second heat exchanger 52, a cooling side heat exchange water pump 53, a constant temperature water tank 54, a heater 541, a temperature sensor T6, a second heat dissipation water pump 55b, a temperature sensor T5, a first temperature regulating valve 57, and a circulation line. Such a heat regulating system v is not shown in the figure.
The heater 541 and the temperature sensor T6 which are arranged inside the constant temperature water tank 54 of the heat regulating system v with the second heat exchanger 52 and the first temperature regulating valve 57, and the structure and the connection mode between the water inlet and outlet pipeline at the first end of the constant temperature water tank 54 and the heat testing system iii are the same as those of the heat regulating system v with the second heat exchanger 52 and the third heat exchanger 56 in 5.1; the structure and connection mode between the water inlet and outlet pipeline at the second end of the constant temperature water tank 54 and the second heat dissipation water pump 55b, the temperature sensor T5 and the first temperature regulating valve 57 are the same as those of the heat regulating system v with the first temperature regulating valve 57 in 5.3, which are not described herein again.
6. Waste heat discharge system VI
And the waste heat discharge system VI is used for discharging waste heat which is not needed by the heat regulating system V to the surrounding environment.
6.1 waste heat discharge system VI connected to third heat exchanger 56
As shown in fig. 1 or 2, the waste heat discharging system vi includes a cooling tower water pump 61, a cooling tower 62, and a circulation line.
And a water inlet pipeline of the cooling tower 62 is communicated with a water outlet pipeline on the secondary side of the third heat exchanger 56, a water outlet pipeline of the cooling tower 62 is communicated with a water inlet end of the cooling tower water pump 61, and a water outlet end of the cooling tower water pump 61 is communicated with a water inlet pipeline on the secondary side of the third heat exchanger 56. The cooling tower water pump 61 is a variable frequency water pump and is used for providing water circulation power, the cooling tower water pump 61 is controlled through variable frequency to enable cooling water to circulate between the secondary side of the third heat exchanger 56 and the cooling tower 62, waste heat transmitted from the primary side of the third heat exchanger 56 to the secondary side is brought into the cooling tower 62, the waste heat is evaporated and dissipated through the cooling tower 62, the waste heat is discharged to the ambient environment, and the temperature T measured by the temperature sensor T6 in the constant temperature water tank 54 is enabled to be measured 6 Maintained at a constant value.
6.2 waste heat discharge system VI connected to a first temperature control valve 57
As shown in fig. 3 or 4, the waste heat discharge system vi includes only the cooling tower 62 and the circulation line.
The water inlet end of the second heat dissipation water pump 55b is communicated with the water outlet end of the first temperature regulating valve 57, the water outlet end of the second heat dissipation water pump 55b is communicated with the water inlet pipeline of the cooling tower 62, and a temperature sensor T5 is arranged on the pipeline between the first temperature regulating valve 57 and the cooling tower 62. The water outlet pipeline of the cooling tower 62 is communicated with the end B2 of the first temperature regulating valve 57 and the second water inlet pipeline of the constant temperature water tank 54.
The second heat-radiating water pump 55b is a variable-frequency water pump for providing power for circulating water in the constant-temperature water tank 54 between the constant-temperature water tank 54 and the cooling tower 62, the second heat-radiating water pump 55b is controlled by variable frequency to directly bring waste heat which cannot be used by the constant-temperature water tank 54 into the cooling tower 62, the waste heat is evaporated and radiated by the cooling tower 62, and the waste heat is discharged to the ambient environment, so that the temperature T measured by the temperature sensor T6 in the constant-temperature water tank 54 is measured 6 Maintained at a constant value.
The selection and connection of different structural subsystems within the heat pump unit test system will result in slightly different embodiments, since the above detailed description has been given for different structures within each subsystem and for the connection between some subsystems, and only the connections and embodiments between subsystems not described above will be described below:
before the performance test of the heat pump unit is carried out, a cooling water circulation pipeline of the heat testing system III is firstly arranged at the CO end of a condenser of the heat pump unit in a penetrating way, and a refrigerating water circulation pipeline of the refrigerating capacity testing system I is arranged at the EV end of an evaporator of the heat pump unit in a penetrating way. The heater 541 in the constant temperature water tank 54 is controlled to start heating, so that the water temperature T measured by the temperature sensor T6 in the water tank is enabled to be 6 Continuously rising, the heat in the constant temperature water tank 54 is transferred to the heat test system III, namely the heat regulating system V supplies heat to the heat test system III, so that the cooling water in the cooling water circulation pipeline penetrating the condenser CO of the heat pump unit is heated, and the temperature T measured by the temperature sensor T1 arranged on the cooling water inlet pipeline close to the condenser CO of the heat pump unit 1 Reaching the starting temperature t of the heat pump unit to be measured 0 When the heat pump unit is started, the heat pump unit to be measured starts to work, and t at the moment 6 Namely, presetting the constant temperature to be kept for the constant temperature water tank 54; once the tested heat pump unit starts to operate, the heater 541 stops heating immediately, and t is always kept in the process 1 ≥t 0 。
As shown in fig. 1, when the cold heat exchange system ii with the first heat exchanger 22, the constant pressure system iv with the constant pressure tank 41, and the thermal regulation system v with the second heat exchanger 52 and the third heat exchanger 56 or the thermal regulation system v with the second heat exchanger 52 and the first temperature regulation valve 57 are connected: in order to make the water flow direction in each pipeline clearer, as shown in fig. 5, the primary side water outlet end of the second heat exchanger 52 is marked as end a, the water outlet end of the cooling water circulation pipeline penetrating through the condenser CO of the heat pump unit is marked as end C, the cooling water flowing out from the end C is divided into two branches, which are respectively marked as branch C1 and branch C2, the cooling water in the branch C1 flows into the primary side water inlet pipeline of the second heat exchanger 52 communicated with the branch C, and the cooling water after heat exchange and temperature reduction flows out from the primary side water outlet pipeline of the second heat exchanger 52 and flows to the end a; the cooling water in the branch C2 flows into a primary side water inlet pipeline of the first heat exchanger 22 communicated with the branch C2, flows through a water mixing pump 23, the cooling water flowing out of a primary side water outlet pipeline of the first heat exchanger 22 after heat exchange and temperature reduction is marked as a path B, and the cooling water in the path B flows into a cooling water inlet pipeline communicated with the path B; the cooling water in the path B is mixed with the cooling water flowing out from the end A and flows into the water inlet end of the cooling water pump 31, and the cooling water flowing out from the water outlet end of the cooling water pump 31 is marked as a path AB. The water temperature of the C1 branch is higher than that of the water flowing out of the A end, the water temperature of the B branch is lower than that of the C2 branch, and the water temperature of the water flowing out of the C end is higher than that of the AB branch. The constant pressure tank 41 is communicated with a cooling water inlet pipeline between the A end and the B end and is communicated with a water inlet end of the cooling water pump 31, and the heat testing system III, the cold and heat exchange system II and the heat adjusting system V exchange heat through the first heat exchanger 22 and the second heat exchanger 52 which exchange heat indirectly, so that the constant pressure system IV is used for independently and constantly pressing the heat testing system III, and the heat pump unit testing system can be used for testing the performance of the high-temperature heat pump unit.
When the cold and heat exchange system ii with the second temperature regulating valve 24, the constant pressure system iv with the constant pressure tank 41, and the heat regulation system v with the second heat exchanger 52 and the third heat exchanger 56 or the heat regulation system v with the second heat exchanger 52 and the first temperature regulating valve 57 are connected (this connection mode is not shown in the figure), the connection and implementation of the constant pressure system iv between other corresponding subsystems are similar to the connection mode described above except that the constant pressure is performed on the heat testing system iii, and thus, the details are not described herein again.
As shown in fig. 2, when the cold heat exchange system ii with the first heat exchanger 22, the constant pressure system iv with the pressure regulating valve 42, and the heat regulation system v with the third heat exchanger 56 or the heat regulation system v with the first temperature regulating valve 57 are connected: in order to make the water flow direction in each pipeline clearer, as shown in fig. 6, the water outlet end of the second water replenishing pump 51b is marked as end a, and the water inlet end thereof is communicated with the water outlet pipeline at the first end of the constant temperature water tank 54, that is, the water in the water outlet pipeline at the first end of the constant temperature water tank 54 flows out from end a; the water outlet end of a cooling water circulation pipeline penetrating through a condenser CO of the heat pump unit is marked as a C end, cooling water flowing out of the C end is divided into two branches which are respectively marked as a C1 branch and a C2 branch, cooling water in the C1 branch flows into a first end water inlet pipeline of the constant temperature water tank 54, flows through a pressure regulating valve 42 arranged on the first end water inlet pipeline of the constant temperature water tank 54 and then flows into the constant temperature water tank 54; cooling water in the branch C2 flows into a primary side water inlet pipeline of the first heat exchanger 22 communicated with the branch C2, flows through a water mixing pump 23, cooling water flowing out of a primary side water outlet pipeline of the first heat exchanger 22 after heat exchange and temperature reduction is marked as a path B, and cooling water in the path B flows into a cooling water inlet pipeline communicated with the path B; the cooling water in the path B and the cooling water flowing out from the end A are mixed, flow through a water pressure sensor P5 and then flow into the water inlet end of a cooling water pump 31; the cooling water flowing out of the water outlet end of the cooling water pump 31 is denoted as an AB path. The water temperature of the C end is higher than that of the AB branch, the water temperature of the C1 branch is higher than that of the A end, and the water temperature of the B branch is lower than that of the C2 branch. The water pressure sensor P5 is used for testing the water pressure at the water inlet end of the cooling water pump 31, the pressure regulating valve 42 is arranged between the heat testing system III and the heat regulating system V, and the cold and heat exchange system II in the connection mode indirectly exchanges heat through the first heat exchanger 22, so that the constant pressure system IV not only performs constant pressure on the heat testing system III, but also at least influences the pressure of the heat regulating system V. However, the function of the constant pressure system IV still enables the heat pump unit testing system provided by the invention to carry out performance testing on the high-temperature heat pump unit.
When the cold and heat exchanging system ii with the second temperature adjusting valve 24, the constant pressure system iv with the pressure adjusting valve 42, and the heat regulating system v with the third heat exchanger 56 or the heat regulating system v with the first temperature adjusting valve 57 are connected (this connection mode is not shown in the figure), the connection and implementation of the constant pressure system iv between other corresponding subsystems are similar to the above connection mode except that the constant pressure is performed on the heat testing system iii, and thus, the description is omitted here.
As shown in fig. 1 and fig. 2, when the thermal regulation system v with the third heat exchanger 56 or the thermal regulation system v with the second heat exchanger 52 and the third heat exchanger 56 is connected to the waste heat discharge system vi connected to the third heat exchanger 56, the specific connection and implementation thereof have been described in the foregoing sub-system structural parts, and are not described herein again.
As shown in fig. 3, when the thermal regulation system v with the first temperature regulation valve 57 or the thermal regulation system v with the second heat exchanger 52 and the first temperature regulation valve 57 is connected to the waste heat discharge system vi connected to the first temperature regulation valve 57: fig. 4 is the same as fig. 3 in connection with this part, and in order to make the water flow direction in each pipeline clearer, as shown in fig. 7, it has been described in detail at the above-mentioned "5.3 heat regulating system v with first temperature regulating valve 57", and the description thereof is omitted.
As shown in fig. 4, when the cold quantity test system i, the cold and heat quantity exchange system ii with the second temperature regulating valve 24, the heat quantity test system iii, and the constant pressure system iv with the pressure regulating valve 42 are connected: in order to make the water flow direction in each pipeline clearer, as shown in fig. 8, the detailed description has been given at the above "2.2 heat and cold exchanging system ii with the second temperature regulating valve 24", and the detailed description is omitted here, and only the emphasis is placed: a cooling water outlet pipeline penetrating through the heat pump unit condenser CO is communicated with the end A of the second temperature regulating valve 24, namely the water inlet pipe at the end A of the second temperature regulating valve 24 is derived from the cooling water outlet pipe penetrating through the heat pump unit condenser CO; the water outlet end of the second water replenishing pump 51B is communicated between the water inlet pipelines of the branch B1 and the water inlet end of the cooling water pump 31, that is, the water flowing out of the branch B1 and the water flowing out of the water outlet end of the second water replenishing pump 51B are mixed and then flow into the water inlet end of the cooling water pump 31, and then flow out of the water outlet end of the cooling water pump 31 and enter the cooling water inlet pipeline penetrating through the condenser CO of the heat pump unit.
When the cold quantity testing system i, the cold and heat quantity exchanging system ii with the second temperature regulating valve 24, the heat quantity testing system iii and the constant pressure system iv with the constant pressure tank 41 are connected (not shown in the figure), the connection mode is different from that described in the previous paragraph in that: the constant pressure tank 41 is communicated between the water inlet pipelines of the B1 branch and the water inlet end of the cooling water pump 31, the constant pressure tank 41 only performs constant pressure on the pipelines communicated with the constant pressure tank, water in the pipelines communicated with the water inlet end of the cooling water pump 31 is converged into the water inlet end of the cooling water pump 31, the water flows out from the water outlet end of the cooling water pump 31 after mixing, and other parts are not described again.
The schematic diagram of the heat pump unit test system module architecture corresponding to the connection manner shown in fig. 1-3 is shown in fig. 9; fig. 10 shows a schematic diagram of a heat pump unit testing system module corresponding to the connection manner of fig. 4. The heat pump unit test system integrates a plurality of devices and pipelines into a whole, only needs to respectively penetrate the cooling water circulation pipeline and the chilled water circulation pipeline of the heat test system III and the cold test system I into the condenser and the evaporator of the heat pump unit to be tested, namely, preparation work before test is finished, test equipment does not need to be newly arranged and function debugging does not need to be carried out according to different heat pump units, operation is simple, and early investment is reduced. The test system can test different working conditions of the water source or ground source heat pump unit, such as refrigeration and heating, flexibly adjust the variables of water flow speed and the like, and has high general degree and more comprehensive test content; and need not the external test equipment of many times dismouting heat pump unit under test, this test system and heat pump unit under test once communicate, can carry out different operating mode tests, and efficiency of software testing is high. The performance test of the water source/ground source high-temperature heat pump unit can be realized through the pressurization effect of the constant pressure system IV. The testing system provided by the invention effectively recycles the heat generated in the test through the cold and heat exchange system II and the heat adjusting system V, namely, the heat which is originally directly discharged to the environment is put into the testing system again, the operation of the testing system is maintained, and the residual waste heat is discharged to the surrounding environment, so that the additional heat supply or refrigeration of the testing system is reduced, the energy is saved, and the heat pollution to the surrounding environment is greatly reduced. In the cold and heat exchange system II and the heat regulation system V, the heat exchangers can be used for exchanging heat, and the heat can be directly transferred in a thermal convection mode of the temperature regulation valve, so that the system is simplified, the heat transfer efficiency is higher, and the safety is ensured.
Example 2
The testing method of the heat pump unit testing system of the invention is described corresponding to embodiment 1 and fig. 1-4. The first heat pump unit test system shown in fig. 1 specifically comprises the following steps:
s1, before testing begins, a cooling water circulation pipeline and a chilled water circulation pipeline of a heat testing system III and a cold testing system I are respectively arranged in a condenser and an evaporator of a tested heat pump unit in a penetrating mode, so that a heat regulating system V supplies heat to the heat testing system III;
s111, a chilled water circulation pipeline of the cold quantity testing system I is arranged in an evaporator EV of the heat pump unit in a penetrating mode, and a cooling water circulation pipeline of the heat quantity testing system III is arranged in a condenser CO of the heat pump unit in a penetrating mode; s112, starting the heater 541 to raise the water temperature in the constant-temperature water tank 54; s113, the heat in the constant-temperature water tank 54 is brought into a heat testing system III;
s2, the temperature of the cooling water in the heat testing system III reaches the starting temperature t 0 When the heat pump unit is started, the heater 541 is turned off, the heat regulating system V stops supplying heat to the heat testing system III, and the test is started:
s211, when the temperature T of the cooling water inlet measured by the temperature sensor T1 1 Reaching the starting temperature t of the heat pump unit to be measured 0 When the heat pump unit condenser CO starts to heat, the heat pump unit evaporator EV is openedStarting refrigeration; s212, according to the inlet water temperature t of the cooling water 1 Controlling the heater 541 to start and stop: when t is 1 ≥t 0 When so, the heater 541 is turned off; when t is 1 ＜t 0 When so, the heater 541 is started; the central water temperature T measured by the temperature sensor T6 in the constant temperature water tank 54 6 Is a constant value not lower than t 1 And t 0 The central water temperature of the constant temperature water tank 54 measured by the temperature sensor T6 at the equal time;
s3, carrying out constant pressure by a constant pressure system IV:
s311, the constant pressure tank 41 is set to the following pressure values: the pressure value ensures that the cooling water in the pipeline communicated with the constant pressure tank 41 is still in a liquid state when the temperature exceeds 100 ℃;
s4, the cold volume test system I tests the refrigeration performance parameters of the heat pump unit evaporator EV under different working conditions, and the heat test system III tests the heating performance parameters of the heat pump unit condenser CO under different working conditions:
s411, according to different working condition requirements, the chilled water circulating in and out of the heat pump unit evaporator EV is controlled to bring the chilled water into the cold quantity test system I by controlling the chilled water pump 11 through frequency conversion, and the temperature of the chilled water flowing out of the heat pump unit evaporator EV is measured as T by the temperature sensor T3 3 The temperature sensor T4 measures the temperature T of the chilled water flowing into the evaporator EV of the heat pump unit 4 The water pressure sensor P3 measures the water pressure P of the chilled water flowing out of the evaporator EV of the heat pump unit 3 The water pressure sensor P4 measures the water pressure P of chilled water flowing into the evaporator EV of the heat pump unit 4 The flow rate q of the chilled water circulating in the evaporator EV of the heat pump unit measured by the chilled water flow meter 12 is 1 The cold quantity generated by the heat pump unit evaporator EV is calculated according to the formula: q EV ＝C 1 ρ 1 q 1 (t 4 -t 3 ) Calculated to obtain, wherein C 1 Is t 4 And t 3 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 1 Is t 4 And t 3 The arithmetic mean value corresponds to the density of water at the temperature;
s412, according to different working condition requirements, the cooling water pump 31 is controlled through frequency conversion to control circulation to enter and exit the heat pump unit condenser COThe cooling water is taken into the heat in the heat testing system III, and the temperature of the cooling water flowing out of the condenser CO of the heat pump unit is measured by the temperature sensor T2 and is T 2 The temperature sensor T1 measures the temperature T of the cooling water flowing into the condenser CO of the heat pump unit 1 The water pressure sensor P2 measures the water pressure P of the cooling water flowing out of the condenser CO of the heat pump unit 2 The water pressure of the cooling water flowing into the condenser CO of the heat pump unit is measured to be P by the water pressure sensor P1 1 The flow rate q of the cooling water circulating in the condenser CO of the heat pump unit is measured by the cooling water flow meter 32 2 The heat generated by the condenser CO of the heat pump unit is calculated according to the formula: q CO ＝C 2 ρ 2 q 2 (t 2 -t 1 ) Calculated to obtain, wherein C 2 Is t 2 And t 1 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 2 Is t 2 And t 1 The arithmetic mean value corresponds to the density of water at temperature;
s5, exchanging the cold quantity absorbed by the cold quantity testing system I in the testing process with the heat absorbed by the heat quantity testing system III in the testing process by the cold and heat exchange system II:
s511, the refrigeration quantity in the refrigeration quantity testing system I is brought into the secondary side of the first heat exchanger 22 through controlling the refrigeration side heat exchange water pump 21 through frequency conversion; s512, the corresponding heat in the heat testing system III is brought into the primary side of the first heat exchanger 22 through the variable-frequency control water charging pump 23; s513, cold energy and heat energy in the first heat exchanger 22 are exchanged, all cold energy in the cold energy testing system I and most heat energy in the heat energy testing system III achieve self balance in the exchange, and more than half of heat energy in the heat energy testing system is defined as most heat energy;
s6, the part of waste heat which cannot be exchanged with the cold energy generated in the cold energy testing system I in the heat testing system III in the cold and heat energy exchanging system II to achieve self balance is brought into the heat regulating system V to provide the heat required by the heat regulating system V:
s611, the first water replenishing pump 51a is controlled through frequency conversion to bring the waste heat in the heat testing system III into the primary side of the second heat exchanger 22; s612, controlling the cooling side heat exchange water pump 53 through frequency conversion to enable water in the constant temperature water tank 54 to circularly flow through the secondary side of the second heat exchanger 22, bringing heat on the primary side of the second heat exchanger 22 into the constant temperature water tank 54, and maintaining the water temperature of the constant temperature water tank 54; s613, the first heat dissipation water pump 55a is controlled by frequency conversion to bring the waste heat of the constant temperature water tank 54 that cannot be used into the primary side of the third heat exchanger 56;
s7, the waste heat which cannot be used by the heat regulating system V is brought into a waste heat discharge system VI again to be discharged into the environment:
s711, the waste heat on the primary side of the third heat exchanger 56 is led into the cooling tower 62 through cooling water circularly flowing through the secondary side of the third heat exchanger 56 by controlling the cooling tower water pump 61 through frequency conversion; the cooling tower 62 discharges the waste heat to the ambient environment through evaporative heat dissipation S712.
As shown in fig. 2, the specific steps of the testing method of the second heat pump unit testing system are different from those of the second heat pump unit testing system in the sub-steps included in S3 and S6, and are as follows:
s321, the pressure regulating valve 42 measures the pressure value P according to the water pressure sensor P5 5 The valve opening is adjusted according to the size of the pressure sensor, and the pressure of a pipeline in the heat testing system III is maintained;
s621, the second water replenishing pump 51b brings the constant-temperature water in the constant-temperature water tank 54 into the heat testing system III, mixes the constant-temperature water with the cooling water in the heat testing system III, heats the mixture by a condenser CO of a heat pump unit, and then flows back into the constant-temperature water tank 54; s622, the first heat dissipation water pump 55a is controlled by frequency conversion to bring the waste heat of the constant temperature water tank 54 into the primary side of the third heat exchanger 56.
As shown in fig. 3, the specific steps of the testing method of the third heat pump unit testing system are different from those of the second heat pump unit testing system in the substeps included in S6 and S7, as follows:
s631, the second water replenishing pump 51b brings the constant-temperature water in the constant-temperature water tank 54 into the heat testing system III, mixes the constant-temperature water with the cooling water in the heat testing system III, heats the mixture by the condenser CO of the heat pump unit, and then flows back into the constant-temperature water tank 54; s632, directly introducing waste heat which cannot be used by the constant-temperature water tank 54 into a waste heat discharge system VI through controlling the second heat dissipation water pump 55b through frequency conversion; s633, mixing part of low-temperature cooling water flowing out of the waste heat discharging system VI with high-temperature cooling water flowing into the waste heat discharging system VI by the first temperature regulating valve 57, and reducing the temperature of the water directly flowing into the waste heat discharging system VI;
s731, the cooling water mixed by the first temperature adjusting valve 57 directly brings the waste heat into the cooling tower 62, and discharges to the surrounding environment.
The specific steps of the testing method of the fourth heat pump unit testing system shown in fig. 4 are different from the testing method of the third heat pump unit testing system in the sub-steps included in S3 and S5, and are as follows:
s341, the pressure regulating valve 42 measures the pressure value P according to the water pressure sensor P5 5 The valve opening is adjusted according to the size of the pressure difference, and the pressure of pipelines in the heat testing system III, the cold testing system I and the cold and heat exchanging system II is maintained;
s541, the second temperature adjusting valve 24 measures the temperature T according to the temperature sensor T4 4 The opening of a valve of the cold testing system is adjusted, part of low-temperature chilled water flowing out of the cold testing system I is mixed with high-temperature water flowing into the cold testing system I and then flows into the cold testing system I, part of low-temperature chilled water in the cold testing system I directly flows into the heat testing system III, all cold in the cold testing system I and most of heat in the heat testing system III reach self balance in exchange, and more than half of heat in the heat testing system III is defined as most of heat.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques. The decomposition and/or recombination of each component or each step in the embodiments of the present invention should be regarded as an equivalent scheme of the present application, and should fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a heat pump set test system, this system includes cold volume test system (I), heat test system (III) and the waste heat discharge system (VI) of discharging unnecessary heat in the test system that carry out capability test to heat pump set which characterized in that: the cold and heat energy testing system is characterized by further comprising a cold and heat energy exchange system (II), wherein one end of the cold and heat energy exchange system (II) is communicated with the cold energy testing system (I), the other end of the cold and heat energy exchange system (II) is communicated with the heat energy testing system (III), and the cold and heat energy exchange system (II) is used for exchanging all cold energy in the cold energy testing system (I) with heat energy in the heat energy testing system (III).
2. A heat pump unit test system according to claim 1, wherein:
the cold quantity testing system (I) comprises a chilled water circulation pipeline penetrating through the heat pump unit evaporator EV, a chilled water flowmeter (12) and a chilled water pump (11) which are arranged on a chilled water inlet pipeline penetrating through the heat pump unit evaporator EV, wherein the water outlet end of the chilled water pump (11) is communicated with the water inlet end of the chilled water flowmeter (12), a temperature sensor T3 and a water pressure sensor P3 are both arranged on a chilled water outlet pipeline close to the heat pump unit evaporator EV, and a temperature sensor T4 and a water pressure sensor P4 are both arranged on a chilled water inlet pipeline close to the heat pump unit evaporator EV;
the heat testing system (III) comprises a cooling water circulation pipeline penetrating through a condenser CO of the heat pump unit, a cooling water flowmeter (32) and a cooling water pump (31) which are arranged on a cooling water inlet pipeline penetrating through the condenser CO of the heat pump unit, wherein the water outlet end of the cooling water pump (31) is communicated with the water inlet end of the cooling water flowmeter (32), a temperature sensor T1 and a water pressure sensor P1 are arranged on a cooling water inlet pipeline close to the condenser CO of the heat pump unit, and a temperature sensor T2 and a water pressure sensor P2 are arranged on a cooling water outlet pipeline close to the condenser CO of the heat pump unit;
the heat testing system (III) is communicated with the waste heat discharging system (VI) through a heat adjusting system (V), the heat adjusting system (V) is used for collecting part of waste heat which cannot be exchanged between the cold and heat exchanging system (II) and all cold generated in the cold and heat testing system (I) in the heat testing system (III), part of the waste heat is used for maintaining the temperature of the heat adjusting system (V), and the rest of the waste heat is discharged to the environment through the waste heat discharging system (VI).
3. A heat pump unit test system according to claim 2, wherein:
the cold and heat exchange system (II) comprises a first heat exchanger (22), a freezing side heat exchange water pump (21) and a water mixing pump (23), wherein the water inlet end of the freezing side heat exchange water pump (21) is communicated with a freezing water outlet pipeline penetrating through an evaporator EV of a heat pump unit, the water outlet end of the freezing side heat exchange water pump (21) is communicated with a secondary side water inlet pipeline of the first heat exchanger (22), and a secondary side water outlet pipeline of the first heat exchanger (22) is communicated with the water inlet end of the freezing water pump (11); the water inlet end of the water mixing pump (23) is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, the water outlet end of the water mixing pump (23) is communicated with a primary side water inlet pipeline of the first heat exchanger (22), and the primary side water outlet pipeline of the first heat exchanger (22) is communicated with the water inlet end of the cooling water pump (31);
or the cold and heat exchange system (II) comprises a second temperature regulating valve (24), the second temperature regulating valve (24) comprises two water inlet ends and one water outlet end, the first water inlet end of the second temperature regulating valve (24) is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, the second water inlet end of the second temperature regulating valve (24) is communicated with a chilled water outlet pipeline penetrating through an evaporator EV of the heat pump unit, the water outlet end of the second temperature regulating valve (24) is communicated with a chilled water inlet pipeline penetrating through the evaporator EV of the heat pump unit, and the water inlet end of the cooling water pump (31) is also communicated between the second water inlet end of the second temperature regulating valve (24) and the chilled water outlet pipeline penetrating through the evaporator EV of the heat pump unit; the second temperature regulating valve (24) mixes the water inlet of the first water inlet end with the water inlet of the second water inlet end and the water flows out of the water outlet end of the second temperature regulating valve (24).
4. A heat pump unit test system according to claim 3, wherein:
the heat regulation system (V) comprises a first water supplementing pump (51 a), a second heat exchanger (52), a cooling side heat exchange water pump (53), a constant temperature water tank (54), a first heat dissipation water pump (55 a), a third heat exchanger (56) and a pipeline, wherein the water inlet end of the first water supplementing pump (51 a) is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, the water outlet end of the first water supplementing pump (51 a) is communicated with a primary side water inlet pipeline of the second heat exchanger (52), a primary side water outlet pipeline of the second heat exchanger (52) is communicated with a cooling water inlet pipeline of the water inlet end of the cooling water pump (31), a secondary side water inlet pipeline of the second heat exchanger (52) is communicated with the water outlet end of the cooling side heat exchange water pump (53), a secondary side water outlet pipeline of the second heat exchanger (52) is communicated with a first end water inlet pipeline of the constant temperature water tank (54), a water inlet end of the cooling side heat exchange water pump (53) is communicated with a first end water inlet pipeline of the constant temperature water tank (541), a temperature sensor T6 and a heater (54) are arranged in the water tank (54), a second end of the constant temperature water exchange water tank (541) is communicated with a second end of the constant temperature heat dissipation water pump (541) is communicated with a second heat exchange water outlet pipeline (55 a) and a heat exchange water outlet pipeline (55 a), a second end of the constant temperature heat dissipation water outlet pipeline (55 a) is communicated with a heat exchange water outlet pipeline, and a second heat dissipation water outlet pipeline (55 a) are arranged in the constant temperature heat exchange water outlet pipeline (55 a), and a heat pump (55) are communicated with a third end of the constant temperature heat dissipation water outlet pipeline (55 a) are communicated with a heat pump (55 a), and a) are arranged in the heat dissipation water outlet pipeline, and a heat pump (55) are communicated with a heat pump (55) are arranged in the heat dissipation water outlet pipeline, and a) are arranged in the heat pump (55 a heat pump (55) are communicated with a) and a heat pump Opening;
or the heat regulating system (V) comprises a second water supplementing pump (51 b), a constant temperature water tank (54), a first heat dissipation water pump (55 a), a third heat exchanger (56) and a pipeline, wherein the water inlet end of the second water supplementing pump (51 b) is communicated with the water outlet pipeline at the first end of the constant temperature water tank (54), the water outlet end of the second water supplementing pump (51 b) is communicated with the cooling water inlet pipeline at the water inlet end of the cooling water pump (31), the water inlet pipeline at the first end of the constant temperature water tank (54) is communicated with the cooling water outlet pipeline penetrating through a heat pump unit condenser CO, a temperature sensor T6 and a heater (541) are arranged in the constant temperature water tank (54), the water outlet pipeline at the second end of the constant temperature water tank (54) is communicated with the water inlet end of the first heat dissipation water pump (55 a), the water outlet end of the first heat dissipation water pump (55 a) is communicated with the water inlet pipeline at the primary side of the third heat exchanger (56), and the water outlet pipeline of the third heat dissipation water exchanger (56) is communicated with the water inlet pipeline at the second end of the constant temperature water tank (54);
the waste heat discharge system (VI) comprises a cooling tower water pump (61), a cooling tower (62) and pipelines, wherein a water inlet pipeline of the cooling tower (62) is communicated with a water outlet pipeline on the secondary side of the third heat exchanger (56), a water outlet pipeline of the cooling tower (62) is communicated with a water inlet end of the cooling tower water pump (61), and a water outlet end of the cooling tower water pump (61) is communicated with a water inlet pipeline on the secondary side of the third heat exchanger (56).
5. A heat pump unit test system according to claim 3, wherein:
the heat adjusting system (V) comprises a second water replenishing pump (51 b), a constant-temperature water tank (54), a second heat radiating pump (55 b), a temperature sensor T5, a first temperature adjusting valve (57) and a pipeline, and the waste heat discharging system (VI) comprises a cooling tower (62) and a pipeline; the water inlet end of the second water replenishing pump (51 b) is communicated with a water outlet pipeline at the first end of the constant-temperature water tank (54), the water outlet end of the second water replenishing pump (51 b) is communicated with a cooling water inlet pipeline at the water inlet end of the cooling water pump (31), a water inlet pipeline at the first end of the constant-temperature water tank (54) is communicated with a cooling water outlet pipeline penetrating through a condenser CO of the heat pump unit, and a temperature sensor T6 and a heater (541) are arranged in the constant-temperature water tank (54); the first temperature regulating valve (57) comprises a first water inlet end, a second water inlet end and a water outlet end, a second end water outlet pipeline of the warm water tank (54) is communicated with the first water inlet end of the first temperature regulating valve (57), the water outlet end of the first temperature regulating valve (57) is communicated with the water inlet end of the second heat dissipation water pump (55 b), the water outlet end of the second heat dissipation water pump (55 b) is communicated with a water inlet pipeline of the cooling tower (62), the temperature sensor T5 is arranged on a water inlet pipeline of the cooling tower (62) at the water outlet end of the second heat dissipation water pump (55 b), the water outlet pipeline of the cooling tower (62) is communicated with the second water inlet end of the first temperature regulating valve (57), and the water inlet pipeline at the second end of the warm water tank (54) is communicated between the second water inlet end of the first temperature regulating valve (57) and the water outlet pipeline of the cooling tower (62);
or the heat regulating system (V) comprises a first water supplementing pump (51 a), a second heat exchanger (52), a cooling side heat exchange water pump (53), a constant temperature water tank (54), a second heat dissipation water pump (55 b), a temperature sensor T5, a first temperature regulating valve (57) and a pipeline, and the waste heat discharging system (VI) comprises a cooling tower (62) and a pipeline; the water inlet end of the first water replenishing pump (51 a) is communicated with a cooling water outlet pipeline penetrating through a condenser CO of a heat pump unit, the water outlet end of the first water replenishing pump (51 a) is communicated with a primary side water inlet pipeline of the second heat exchanger (52), the primary side water outlet pipeline of the second heat exchanger (52) is communicated with a cooling water inlet pipeline of the water inlet end of the cooling water pump (31), a secondary side water inlet pipeline of the second heat exchanger (52) is communicated with the water outlet end of the cooling side heat exchange water pump (53), the secondary side water outlet pipeline of the second heat exchanger (52) is communicated with a first end water inlet pipeline of the constant temperature water tank (54), the water inlet end of the cooling side heat exchange water pump (53) is communicated with a first end water outlet pipeline of the constant temperature water tank (54), and a temperature sensor T6 and a heater (541) are arranged in the constant temperature water tank (54); the first temperature regulating valve (57) comprises a first water inlet end, a second water inlet end and a water outlet end, a second end water outlet pipeline of the warm water tank (54) is communicated with the first water inlet end of the first temperature regulating valve (57), the water outlet end of the first temperature regulating valve (57) is communicated with the water inlet end of the second heat dissipation water pump (55 b), the water outlet end of the second heat dissipation water pump (55 b) is communicated with a water inlet pipeline of the cooling tower (62), the water inlet pipeline of the cooling tower (62) at the water outlet end of the second heat dissipation water pump (55 b) is provided with the temperature sensor T5, the water outlet pipeline of the cooling tower (62) is communicated with the second water inlet end of the first temperature regulating valve (57), and the water inlet pipeline of the second end of the warm water tank (54) is communicated between the second water inlet end of the first temperature regulating valve (57) and the water outlet pipeline of the cooling tower (62).
6. A heat pump unit test system according to claim 4 or 5, characterized in that:
the heat testing system (III) is also communicated with a constant pressure system (IV), the constant pressure system (IV) comprises a constant pressure tank (41) and a communicating pipeline, and the constant pressure tank (41) is used for performing constant pressure on the pipeline communicated with the constant pressure tank (41);
or the constant pressure system (IV) comprises a pressure regulating valve (42) and a water pressure sensor P5, the water pressure sensor P5 is arranged on a water inlet pipeline of the cooling water pump (31), and the pressure regulating valve (42) maintains the pressure in the pipeline connected with the pressure regulating valve (42) and the water pressure sensor P5 according to the opening of the water pressure sensor P5.
7. The test method applied to the heat pump unit test system of the claims 1 to 5, is characterized in that:
s1, before testing, cooling water circulation pipelines and chilled water circulation pipelines of a heat testing system (III) and a cold testing system (I) are respectively arranged in a condenser and an evaporator of a tested heat pump unit in a penetrating manner, so that a heat regulating system (V) supplies heat to the heat testing system (III);
s2, the temperature of cooling water in the heat testing system (III) reaches a starting temperature t 0 When the heat pump unit to be tested is started, the heater (541) is turned off, the heat regulating system (V) stops supplying heat to the heat testing system (III), and the test is started;
s3, performing constant pressure by a constant pressure system (IV);
s4, testing the refrigeration performance parameters of the heat pump unit evaporator EV under different working conditions by the cold quantity testing system (I), and testing the heat supply performance parameters of the heat pump unit condenser CO under different working conditions by the heat quantity testing system (III);
s5, the cold and heat exchange system (II) exchanges the cold energy absorbed by the cold energy testing system (I) in the testing process with the heat absorbed by the heat testing system (III) in the testing process;
s6, the part of waste heat which cannot be exchanged with the cold energy generated in the cold energy testing system (I) in the heat testing system (III) in the cold and heat exchanging system (II) to achieve self balance is brought into the heat regulating system (V) to provide the heat required by the heat regulating system (V);
and S7, the waste heat which cannot be used by the heat regulating system (V) is brought into a waste heat discharge system (VI) again to be discharged to the environment.
8. The method for testing a heat pump unit test system according to claim 7, wherein:
the step S1 includes the steps of:
s111, a chilled water circulation pipeline in a cold quantity testing system (I) is arranged on an EV (electric vehicle) refrigeration side of a heat pump unit evaporator in a penetrating mode, and a cooling water circulation pipeline in a heat quantity testing system (III) is arranged on a CO heat supply side of a heat pump unit condenser in a penetrating mode;
s112, starting a heater (541) of a constant-temperature water tank (54) in the heat regulating system (V) to increase the water temperature in the constant-temperature water tank (54);
s113, transferring heat in the constant-temperature water tank (54) to a heat testing system (III);
the step S2 includes the steps of:
s211, when the cooling water inlet temperature t is higher than the water inlet temperature 1 Reaching the starting temperature t of the heat pump unit to be measured 0 When the heat pump unit condenser CO starts to supply heat, and the heat pump unit evaporator EV starts to refrigerate;
s212, according to the inlet water temperature t of the cooling water 1 Controlling the heater (541) to start and stop: when t is 1 ≥t 0 When the heater (541) is turned off; when t is 1 ＜t 0 When the temperature is high, the heater (541) is started; the central water temperature T measured by a temperature sensor T6 in the constant temperature water tank (54) 6 Is a constant value not lower than t 1 And t 0 The central water temperature of the constant temperature water tank (54) is measured by the temperature sensor T6 at the same time;
the step S3 includes the steps of:
s311, directly setting the constant pressure tank (41) to the following pressure values: the pressure value ensures that the cooling water in the pipeline communicated with the constant pressure tank (41) is still in a liquid state when the temperature exceeds 100 ℃;
alternatively, step S3 includes the steps of:
s321, the pressure regulating valve (42) measures the pressure value P according to the water pressure sensor P5 5 The valve opening is adjusted according to the size of the pressure difference, and the pressure of a pipeline in the heat testing system (III) is maintained;
step S4 includes the following steps:
s411, according to different working condition requirements, the refrigerating water pump (11) is controlled through frequency conversion to control refrigerating water circularly flowing in and out of the heat pump unit evaporator EV to bring refrigerating capacity into the refrigerating capacity testing system (I), and the temperature sensor T3 measures the temperature of the refrigerating water flowing out of the heat pump unit evaporator EV as T 3 The temperature sensor T4 detects the inflow heat of the chilled waterThe water temperature of the pump unit evaporator EV is t 4 The water pressure of the chilled water flowing out of the evaporator EV of the heat pump unit is measured by the water pressure sensor P3 to be P 3 The water pressure sensor P4 measures the water pressure P of chilled water flowing into the evaporator EV of the heat pump unit 4 The flow rate of the chilled water circulated in the evaporator EV of the heat pump unit is q measured by a chilled water flow meter (12) 1 The cold energy generated by the heat pump unit evaporator EV passes through a formula: q EV ＝C 1 ρ 1 q 1 (t 4 -t 3 ) Calculated to obtain, wherein C 1 Is t 4 And t 3 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 1 Is t 4 And t 3 The arithmetic mean value corresponds to the density of water at temperature;
s412, controlling the heat of cooling water circularly flowing into and out of the condenser CO of the heat pump unit and entering the heat test system (III) by controlling the cooling water pump (31) through frequency conversion according to different working condition requirements, wherein the temperature of the water, flowing out of the condenser CO of the heat pump unit, of the cooling water is measured as T by the temperature sensor T2 2 The temperature sensor T1 measures the temperature T of the cooling water flowing into the condenser CO of the heat pump unit 1 The water pressure sensor P2 measures the water pressure P of the cooling water flowing out of the condenser CO of the heat pump unit 2 The water pressure sensor P1 measures the water pressure P of the cooling water flowing into the condenser CO of the heat pump unit 1 The flow rate q of the cooling water circulating in the condenser CO of the heat pump unit is measured by the cooling water flowmeter 32 2 The heat generated by the condenser CO of the heat pump unit is expressed by the formula: q CO ＝C 2 ρ 2 q 2 (t 2 -t 1 ) Calculated to obtain, wherein C 2 Is t 2 And t 1 The arithmetic mean corresponds to the specific heat capacity, rho, of water at temperature 2 Is t 2 And t 1 The arithmetic mean value corresponds to the density of water at temperature;
9. the method for testing a heat pump unit test system according to claim 8, wherein:
step S5 includes the steps of:
s511, the refrigerating capacity in the refrigerating capacity testing system (I) is brought into the secondary side of the first heat exchanger (22) through the variable-frequency control refrigerating side heat exchange water pump (21); s512, the corresponding heat in the heat testing system (III) is brought into the primary side of the first heat exchanger (22) through the variable-frequency control water charging pump (23); s513, cold and heat in the first heat exchanger (22) are exchanged, all cold in the cold testing system (I) and most heat in the heat testing system (III) achieve self balance in the exchange, and more than half of heat in the heat testing system is defined as most heat;
alternatively, step S5 includes the steps of:
s541, the second temperature regulating valve (24) measures the temperature T according to the temperature sensor T4 4 The opening of a valve is adjusted, so that part of low-temperature chilled water flowing out of a cold testing system (I) is mixed with high-temperature water flowing into the cold testing system (I) and then flows into the cold testing system (I), part of low-temperature chilled water in the cold testing system (I) directly flows into a heat maintaining testing system (III), all cold in the cold testing system (I) and most of heat in the heat testing system (III) reach self balance in exchange, and more than half of heat in the heat testing system is defined as most of heat;
10. the method for testing a heat pump unit test system according to claim 9, wherein:
steps S6, S7 include the following steps:
s611, the first water replenishing pump (51 a) is controlled through frequency conversion to bring the waste heat in the heat testing system (III) into the primary side of the second heat exchanger (22); s612, controlling a cooling side heat exchange water pump (53) through frequency conversion to enable water in the constant temperature water tank (54) to circularly flow through a secondary side of a second heat exchanger (22), and bringing heat on the primary side of the second heat exchanger (22) into the constant temperature water tank (54) to maintain the water temperature of the constant temperature water tank (54); s613, the first heat dissipation water pump (55 a) is controlled through frequency conversion to bring waste heat which cannot be used by the constant-temperature water tank (54) into the primary side of the third heat exchanger (56);
s711, the waste heat on the primary side of the third heat exchanger (56) is brought into the cooling tower (62) through cooling water circularly flowing through the secondary side of the third heat exchanger (56) by controlling a cooling tower water pump (61) through frequency conversion; the cooling tower (62) discharges waste heat to the ambient environment by evaporative heat dissipation S712.
Alternatively, steps S6 and S7 include the following steps:
s621, a second water replenishing pump (51 b) brings constant-temperature water in a constant-temperature water tank (54) into a heat testing system (III), mixes the constant-temperature water with cooling water in the heat testing system (III), heats the mixture by a condenser CO of a heat pump unit, and then flows back into the constant-temperature water tank (54); s622, the first heat dissipation water pump (55 a) is controlled through frequency conversion to bring waste heat which cannot be used by the constant-temperature water tank (54) into the primary side of the third heat exchanger (56);
s721, the waste heat on the primary side of the third heat exchanger (56) is brought into the cooling tower (62) through cooling water circularly flowing through the secondary side of the third heat exchanger (56) by controlling a cooling tower water pump (61) through frequency conversion; the cooling tower (62) discharges the waste heat to the ambient environment through evaporative heat dissipation S722.
Alternatively, steps S6 and S7 include the following steps:
s631, the second water replenishing pump (51 b) brings the constant-temperature water in the constant-temperature water tank (54) into the heat testing system (III), mixes the constant-temperature water with the cooling water in the heat testing system (III), heats the mixture by the condenser CO of the heat pump unit, and then flows back into the constant-temperature water tank (54); s632, directly bringing waste heat which cannot be used by the constant-temperature water tank (54) into a waste heat discharge system (VI) by controlling a second heat dissipation water pump (55 b) through frequency conversion; s633, mixing part of low-temperature cooling water flowing out of the waste heat discharge system (VI) with high-temperature cooling water flowing into the waste heat discharge system (VI) by the first temperature regulating valve (57), and reducing the temperature of the water directly flowing into the waste heat discharge system (VI);
s731, the cooling water mixed by the first temperature regulating valve (57) directly brings waste heat into the cooling tower (62) and discharges the waste heat to the surrounding environment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115451609A (en) * | 2022-09-14 | 2022-12-09 | 合肥通用机械研究院有限公司 | Condensation heat recovery system and method during refrigeration evaluation of water chilling unit |
| CN116754273A (en) * | 2023-08-11 | 2023-09-15 | 合肥通用机械研究院有限公司 | Cold water unit reverse temperature working condition testing system and working condition unit control strategy |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115451609A (en) * | 2022-09-14 | 2022-12-09 | 合肥通用机械研究院有限公司 | Condensation heat recovery system and method during refrigeration evaluation of water chilling unit |
| CN115451609B (en) * | 2022-09-14 | 2023-09-22 | 合肥通用机械研究院有限公司 | Condensation heat recovery system and recovery method for refrigeration evaluation of water chilling unit |
| CN116754273A (en) * | 2023-08-11 | 2023-09-15 | 合肥通用机械研究院有限公司 | Cold water unit reverse temperature working condition testing system and working condition unit control strategy |
| CN116754273B (en) * | 2023-08-11 | 2023-11-14 | 合肥通用机械研究院有限公司 | Cold water unit reverse temperature working condition testing system and working condition unit control strategy |
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