CN117347089A - Reverse temperature working condition test system and working condition set control strategy of water chilling unit - Google Patents
Reverse temperature working condition test system and working condition set control strategy of water chilling unit Download PDFInfo
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- CN117347089A CN117347089A CN202311323957.5A CN202311323957A CN117347089A CN 117347089 A CN117347089 A CN 117347089A CN 202311323957 A CN202311323957 A CN 202311323957A CN 117347089 A CN117347089 A CN 117347089A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Abstract
The invention belongs to the technical field of refrigeration test of water chilling units, and particularly relates to a reverse temperature working condition test system of a water chilling unit and a working condition unit control strategy. The reverse temperature working condition test system of the water chilling unit comprises a test subsystem for simulating a reverse temperature working condition and testing a test prototype, and a heat dissipation subsystem for discharging heat in the test subsystem into the surrounding environment; the test prototype comprises a test prototype evaporator and a test prototype condenser; the test subsystem comprises a working condition unit, a test sample machine chilled water pump, a test sample machine cooling water pump and a pipeline; the working condition unit comprises a working condition unit condenser and a working condition unit evaporator; the heat radiation subsystem comprises a cooling tower, a working condition unit condenser water pump and a pipeline. The invention can test the performance of the water cooling chiller in an efficient and energy-saving way under the reverse temperature working condition.
Description
The application is a divisional application of a cold water unit reverse temperature working condition test system and a working condition unit control strategy with application number 202311007254.1 of 2023, 8 and 11 days, and the original acceptance mechanism is China.
Technical Field
The invention belongs to the technical field of refrigeration test of water chilling units, and particularly relates to a reverse temperature working condition test system of a water chilling unit and a working condition unit control strategy.
Background
Along with the progress of technology, the refrigeration technology is widely applied in modern life, and the development is mature.
The water chilling unit, especially the water chilling unit, has been widely used in the production construction of various industries, and many water chilling units have had corresponding technical conditions for year-round refrigeration operation. However, in winter, the water-cooling chiller operates in refrigeration mode, and a reverse temperature working condition is most likely to occur, namely, the inlet water temperature of the evaporator is equal to or higher than the outlet water temperature of the condenser, and the outlet water temperature of the evaporator is equal to or higher than the inlet water temperature of the condenser.
However, the test system of the water-cooling chiller in the prior art cannot stably and flexibly simulate the reverse temperature working condition, so that the performance of the water-cooling chiller cannot be tested efficiently and energy-effectively under the reverse temperature working condition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a reverse temperature working condition test system for a water chilling unit, which is used for efficiently and energy-saving testing the performance of the water chilling unit under the reverse temperature working condition.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the reverse temperature working condition test system of the water chilling unit is characterized by comprising a test subsystem for simulating a reverse temperature working condition and testing a test prototype and a heat dissipation subsystem for discharging heat in the test subsystem into the surrounding environment; the test prototype comprises a test prototype evaporator and a test prototype condenser; the test subsystem comprises a working condition unit, a test sample machine chilled water pump, a test sample machine cooling water pump and a pipeline; the working condition unit comprises a working condition unit condenser and a working condition unit evaporator; the heat radiation subsystem comprises a cooling tower, a working condition unit condenser water pump and a pipeline; the water outlet end of the test sample machine chilled water pump is communicated with the water inlet pipeline of the test sample machine evaporator, and the water inlet end of the test sample machine chilled water pump is communicated with the water outlet pipeline of the test sample machine evaporator; the water outlet end of the test prototype cooling water pump is communicated with the water inlet pipeline of the test prototype condenser, and the water inlet end of the test prototype cooling water pump is communicated with the water outlet pipeline of the test prototype condenser; the working condition unit evaporator brings the evaporating cold into the test sample condenser by connecting a pipeline in parallel between the water inlet end of the test sample cooling water pump and the water outlet pipeline of the test sample condenser; the working condition unit condenser brings a part of condensation heat into the test sample machine evaporator through a pipeline connected in parallel between the water inlet end of the test sample machine chilled water pump and the water outlet pipeline of the test sample machine evaporator; the working condition unit condenser is further provided with a working condition unit condenser water pump and a cooling tower in series on the pipeline, and the other part of condensation heat is discharged into the surrounding environment through the cooling tower.
Preferably, the test subsystem further comprises an evaporator water adding pump, a low-temperature side of a working condition unit condenser heat recovery heat exchanger, a constant-temperature water tank, a condenser water supplementing pump and a working condition unit evaporator water pump; the heat radiation subsystem also comprises a high temperature side of a heat recovery heat exchanger of a condenser of the working condition unit; the water inlet end of the chilled water pump of the test sample machine is also communicated with the water outlet end of the water adding pump of the evaporator, the water inlet end of the water adding pump of the evaporator is communicated with a water outlet pipeline at the low temperature side of the heat recovery heat exchanger of the condenser of the working condition machine set, and the water inlet pipeline at the low temperature side of the heat recovery heat exchanger of the condenser of the working condition machine set is communicated with a water outlet pipeline of the evaporator of the test sample machine; the first water outlet end of the constant-temperature water tank is communicated with the water inlet end of the condenser water supplementing pump, the water outlet end of the condenser water supplementing pump is respectively communicated with the water inlet end of the cooling water pump of the test sample machine and the first water inlet end of the constant-temperature water tank, and the water outlet pipeline of the condenser of the test sample machine is communicated with the first water inlet end of the constant-temperature water tank; the second water outlet end of the constant temperature water tank is communicated with the water inlet end of the working condition unit evaporator water pump, the water outlet end of the working condition unit evaporator water pump is communicated with the water inlet pipeline of the working condition unit evaporator, and the water outlet pipeline of the working condition unit evaporator is communicated with the second water inlet end of the constant temperature water tank; the water outlet end of the working condition unit condenser water pump is communicated with the water inlet pipeline of the working condition unit condenser, the water outlet pipeline of the working condition unit condenser is communicated with the high-temperature side water inlet pipeline of the working condition unit condenser heat recovery heat exchanger, the high-temperature side water outlet pipeline of the working condition unit condenser heat recovery heat exchanger is communicated with the water inlet end of the cooling tower, and the water outlet end of the cooling tower is communicated with the water inlet end of the working condition unit condenser water pump.
Preferably, the test subsystem further comprises a chilled water temperature two-way regulating valve, a low-temperature side of a heat recovery heat exchanger of a condenser of the working condition unit, a cold recovery heat exchanger of the working condition unit, a cooling water temperature two-way regulating valve and an evaporator water pump of the working condition unit; the heat radiation subsystem also comprises a high temperature side of a heat recovery heat exchanger of a condenser of the working condition unit; the water inlet end of the chilled water pump of the test sample machine is also communicated with the water outlet end of the chilled water temperature two-way regulating valve, the water inlet end of the chilled water temperature two-way regulating valve is communicated with a water outlet pipeline at the low temperature side of the heat recovery heat exchanger of the working condition unit condenser, and the water inlet pipeline at the low temperature side of the heat recovery heat exchanger of the working condition unit condenser is communicated with a water outlet pipeline of the evaporator of the test sample machine; the high-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger is communicated with the water inlet end of the cooling water temperature two-way regulating valve, the water outlet end of the cooling water temperature two-way regulating valve is respectively communicated with the water inlet end of the cooling water pump of the test prototype and the high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger, and the water outlet pipeline of the condenser of the test prototype is communicated with the high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger; the low-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger is communicated with the water inlet end of the working condition unit evaporator water pump, the water outlet end of the working condition unit evaporator water pump is communicated with the water inlet pipeline of the working condition unit evaporator, and the water outlet pipeline of the working condition unit evaporator is communicated with the low Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger; the water outlet end of the working condition unit condenser water pump is communicated with the water inlet pipeline of the working condition unit condenser, the water outlet pipeline of the working condition unit condenser is communicated with the high-temperature side water inlet pipeline of the working condition unit condenser heat recovery heat exchanger, the high-temperature side water outlet pipeline of the working condition unit condenser heat recovery heat exchanger is communicated with the water inlet end of the cooling tower, and the water outlet end of the cooling tower is communicated with the water inlet end of the working condition unit condenser water pump.
Preferably, the test subsystem further comprises a cooling water temperature three-way regulating valve, a chilled water temperature three-way regulating valve and a working condition unit evaporator water pump; the cooling water temperature three-way regulating valve comprises a third water inlet end, a third water outlet end and a fourth water outlet end, and cooling water flowing out of a water outlet pipeline of the condenser of the test prototype is split into a first branch and a second branch; the water outlet pipeline of the working condition unit evaporator is communicated with the third water inlet end of the cooling water temperature three-way regulating valve, the fourth water outlet end of the cooling water temperature three-way regulating valve is connected with the first branch in parallel with the water inlet end of the cooling water pump of the test sample machine, the third water outlet end of the cooling water temperature three-way regulating valve is connected with the second branch in parallel with the water inlet end of the working condition unit evaporator water pump, and the water outlet end of the working condition unit evaporator water pump is communicated with the water inlet pipeline of the working condition unit evaporator; the chilled water temperature three-way regulating valve comprises a fifth water inlet end, a fifth water outlet end and a sixth water outlet end, and cooling water flowing out from a water outlet pipeline of the test sample machine evaporator is split into a third branch and a fourth branch; the water outlet pipeline of the working condition unit condenser is communicated with the fifth water inlet end of the chilled water temperature three-way regulating valve, the sixth water outlet end of the chilled water temperature three-way regulating valve is connected with the third branch in parallel at the water inlet end of the chilled water pump of the test model machine, the water outlet end of the chilled water temperature three-way regulating valve is connected with the fourth branch in parallel at the water inlet end of the cooling tower, the water outlet end of the cooling tower is communicated with the water inlet end of the working condition unit condenser water pump, and the water outlet end of the working condition unit condenser water pump is communicated with the water inlet pipeline of the working condition unit condenser.
Preferably, the water inlet pipeline of the test prototype evaporator is also provided with a chilled water flowmeter and a first temperature sensor, and the water outlet pipeline of the test prototype evaporator is also provided with a second temperature sensor; the water inlet pipeline of the test prototype condenser is also provided with a cooling water flowmeter and a fourth temperature sensor, and the water outlet pipeline of the test prototype condenser is also provided with a third temperature sensor.
The invention also provides a working condition unit control strategy which is applied to the reverse temperature working condition test system of the water chilling unit, and is characterized by comprising the following steps of:
s1, after a working condition unit receives a starting signal, a cluster control system performs fault detection on each device in the working condition unit, and after confirming that no fault exists, the cluster control system determines the on-off sequence of each compressor in the working condition unit as an on-duty compressor or manually designates one on-duty compressor according to a wheel value strategy;
round value strategy: the cluster control system records the running time of each compressor in the working condition unit from the first day of each month, designates the compressor with the shortest running time as the duty compressor, arranges the starting sequence of each unloaded running compressor in the working condition unit according to the sequence from the short running time to the long running time, and arranges the shutdown sequence of each loaded running compressor in the working condition unit according to the sequence from the long running time to the short running time;
S2, starting the compressor on duty, and running one of the following strategies by the working condition unit: the loading strategy of the current duty compressor, the loading strategy of the working condition unit and the reducing strategy of the working condition unit;
s3, working condition unit shutdown strategies: when the water flow of the evaporator water pump of the working condition unit and/or the condenser water pump of the working condition unit is cut off, or the actual value Tpv of the water outlet temperature of the water outlet pipeline of the evaporator of the current working condition unit is at the dead zone temperature T ref And when the working condition unit is in the following state, the working condition unit is stopped.
Preferably, the loading strategy of the currently on-duty compressor in S2 further includes the following steps:
the method comprises the steps of (1) presetting a water outlet temperature target value Tsp of a water outlet pipeline of a working condition unit evaporator WCEV, acquiring a water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV once per second by a cluster control system, recording the moment when the cluster control system starts to acquire the water outlet temperature actual value of the water outlet pipeline of the working condition unit evaporator WCEV as 0 th second, and calculating the water temperature change rate Vpv of the nth second according to the water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV acquired by the cluster control system:
tpv (i) represents the actual value of the outlet water temperature of the ith second, tpv (i+1) represents the actual value of the outlet water temperature of the (i+1) th second, wherein i is more than or equal to 0 and less than or equal to n, and i is an integer;
Each compressor in the working condition unit adopts variable frequency control, each compressor corresponds to a set of PID regulating function, and Tpv is close to Tsp by continuously adjusting Tpv of the cluster control system:
if Tpv-Tsp is more than or equal to 10 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV to Vmax=1 ℃/min, judges whether Vpv is less than Vmax, allows the current duty compressor to load if Vpv is less than Vmax, and prohibits the current duty compressor from loading if Vpv is not less than Vmax;
if the temperature is more than or equal to 5 ℃ and less than Tpv-Tsp is less than 10 ℃, the cluster control system sets the maximum rate of change Vmax=0.5 ℃/min of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether the Vpv is less than Vmax, allows the current duty compressor to load if the Vpv is less than Vmax, and prohibits the current duty compressor from loading if the Vpv is less than Vmax;
if Tpv-Tsp is less than 5 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature Vmax=0.2 ℃/min of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether Vpv is less than Vmax, allows the current duty compressor to load if Vpv is less than Vmax, and prohibits the current duty compressor from loading if Vpv is not less than Vmax.
Preferably, the machine adding strategy of the working condition unit in S2 further comprises the following steps:
sb1, when the cluster control system detects that the running capacity of the running compressor in the working condition unit reaches more than 95% of the full-load running capacity within a first set time threshold delta t1, the cluster control system starts to calculate whether the working condition unit meets the machine adding condition;
sb2, the cluster control system calculates a target temperature difference delta T1 = Tpv-Tsp between an actual outlet water temperature value Tpv of an outlet water pipeline of the evaporator of the unit under the current working condition and a target outlet water temperature value Tsp, and returns to Sb1 if the current target temperature difference delta T1 is lower than a first set temperature difference value threshold;
if the current target temperature difference delta T1 is above the first set temperature difference threshold value, the cluster control system calculates a second change difference delta T2= | Tpv-Tpv '| between an actual value Tpv of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator at the moment and an actual value Tpv' of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator passing through the second set time threshold delta T2 from the moment, and if the second change difference delta T2 is above the second set temperature difference threshold value, the cluster control system returns to Sb1; if the second variation difference value delta T2 is lower than a second set temperature difference value threshold value, the working condition unit meets the machine adding condition;
And Sb3, increasing the loading operation of the compressor by the working condition unit according to a wheel strategy or a manually specified starting sequence.
Preferably, the shutdown strategy of the working condition unit in S2 further comprises the following steps:
sc1, the cluster control system detects that at least one compressor in the working condition unit is running, if the running capacity of the at least one compressor is maintained below 40% of the full-load running capacity within a third set time threshold delta t3, the cluster control system starts to calculate whether the working condition unit meets the condition of reducing the running speed;
the cluster control system judges whether the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator WCEV is below the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator, and if the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator is higher than the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, the process returns to Sc1;
if the actual outlet water temperature Tpv of the outlet water pipeline of the evaporator of the working condition unit is below the target outlet water temperature Tsp of the outlet water pipeline of the evaporator of the working condition unit, the cluster control system calculates an actual outlet water temperature Tpv of the outlet water pipeline of the WCEV of the working condition unit at the moment and a fourth variation difference delta T4= | Tpv-Tpv | between the actual outlet water temperature Tpv of the outlet water pipeline of the evaporator of the working condition unit passing through a third set time threshold delta T3 from the moment, and if the fourth variation difference delta T4 is above the fourth set temperature difference threshold, the cluster control system returns to Sc1; if the fourth variation difference value delta T4 is lower than a fourth set temperature difference value threshold value, the working condition unit meets the condition of reducing the machine;
Sc3, the cluster control system reduces the non-duty compressors running in the working condition unit according to a wheel strategy or a manually specified shutdown sequence, and ensures that the running capacity of the duty compressors is controlled to be not lower than 40% of the full-load running capacity; the cluster control system turns off only one off-duty compressor at a time and returns to Sc1.
Preferably, the dead zone temperature T in S3 ref ＝Tsp-5℃。
The invention has the beneficial effects that:
(1) The cold energy in the constant-temperature water tank is substituted into the condenser of the test prototype through the condenser water supplementing pump, and the condensing heat of the constant-temperature water tank is brought by the condenser of the test prototype through the balance of the evaporator of the working condition machine set and the water pump of the evaporator of the working condition machine set. The evaporator is used for adding water to bring the cold energy of the evaporator of the test sample machine into the low-temperature side of the heat recovery heat exchanger of the condenser of the working condition unit, the water pump of the condenser of the working condition unit is used for bringing the heat in the condenser of the working condition unit into the high-temperature side of the heat recovery heat exchanger of the condenser of the working condition unit, and the high-temperature side and the low-temperature side of the heat recovery heat exchanger of the condenser of the working condition unit exchange heat, so that the water inlet temperature of the evaporator of the test sample machine is equal to or higher than the water outlet temperature of the condenser of the test sample machine, and the water outlet temperature of the evaporator of the test sample machine is equal to or higher than the water inlet temperature of the condenser of the test sample machine, thereby realizing the reverse temperature working condition.
(2) According to the cold water machine set reverse temperature working condition testing system, the condensation heat of the condenser of the testing prototype is brought into the high temperature side of the working condition machine set cold energy recovery heat exchanger through the cooling water temperature two-way regulating valve, the evaporation cold energy generated by the working condition machine set evaporator is brought into the low temperature side of the working condition machine set cold energy recovery heat exchanger through the working condition machine set evaporator water pump, the high temperature side and the low temperature side of the working condition machine set cold energy recovery heat exchanger exchange heat, so that the condensation heat generated by the condenser of the testing prototype is balanced, and the water inlet temperature of the condenser of the testing prototype is reduced. The cold energy of the evaporator of the test sample machine is brought into the low-temperature side of the heat recovery heat exchanger of the condenser of the working condition machine set through the two-way chilled water temperature regulating valve, the heat in the condenser of the working condition machine set is brought into the high-temperature side of the heat recovery heat exchanger of the condenser of the working condition machine set through the water pump of the condenser of the working condition machine set, and the high-temperature side and the low-temperature side of the heat recovery heat exchanger of the condenser of the working condition machine set exchange heat, so that the water inlet temperature of the evaporator of the test sample machine is equal to or higher than the water outlet temperature of the condenser of the test sample machine, and the water outlet temperature of the evaporator of the test sample machine is equal to or higher than the water inlet temperature of the condenser of the test sample machine, namely the reverse temperature working condition is realized.
(3) According to the cold water machine set reverse temperature working condition testing system, the valve opening of the three-way regulating valve for controlling the cooling water temperature divides the evaporation cold energy generated by the working condition machine set evaporator carried out by the working condition machine set evaporator water pump into two parts, and one part of the evaporation cold energy is directly carried into the testing machine set condenser through the heat convection of water flow, so that the condensation heat generated by the testing machine set condenser is balanced, and the water inlet temperature of the testing machine set condenser is reduced; after the cold water carrying the other part of evaporated cold energy is mixed with the high-temperature cooling water which does not directly enter the water inlet pipeline of the condenser of the test sample machine, the condensation heat carried by the high-temperature cooling water is balanced, and the mixture returns to the evaporator of the working condition unit. In the same way, the cold water unit reverse temperature working condition testing system divides the condensation heat generated by the working condition unit condenser brought by the working condition unit condenser water pump into two parts by controlling the valve opening of the refrigerating water temperature three-way regulating valve, and part of the condensation heat is directly brought into the test sample machine evaporator by the heat convection of water flow to be used for balancing the evaporation cold energy generated by the test sample machine evaporator; and after the hot water carrying the other part of condensation heat is mixed with the low-temperature chilled water which does not directly enter the water inlet pipeline of the evaporator of the test sample machine, balancing the evaporation cold energy carried by the low-temperature chilled water, and entering the cooling tower.
(4) When the cold water cooling unit is tested under the reverse temperature working condition, the superfluous heat which is not balanced in the working condition unit condenser is in the condensed water, and is connected into the cooling tower through a pipeline and is discharged into the surrounding environment.
(5) The cold water machine set reverse temperature working condition testing system provided by the invention recovers the condensation heat generated by the working condition machine set condenser, and is reused in the testing subsystem to simulate the reverse temperature working condition, and only a small part of heat is dissipated into the surrounding environment in a cooling way of the cooling tower.
(6) Compared with the evaporation cold quantity generated by the working condition unit evaporator, the evaporation cold quantity generated by the working condition unit evaporator balances the condensation heat quantity generated by the testing prototype condenser through the second water inlet end and the second water outlet end of the constant temperature water tank and the condensation heat quantity generated by the testing prototype condenser through the first water inlet end and the second water outlet end of the constant temperature water tank, so that the central temperature of the constant temperature water tank is kept at a set temperature, and the temperature regulation of the cold water unit reverse temperature working condition testing system is more sensitive.
(7) The cold and hot quantity is directly exchanged in the test subsystem through the three-way regulating valve in a water flow heat convection mode, so that the energy loss caused by setting a constant-temperature water tank and a heat exchanger is avoided, the temperature regulation of the cold water machine set reverse temperature working condition test system is more sensitive, the energy utilization efficiency is further improved, and the purposes of energy conservation and concentration are achieved by optimizing the heating and heat dissipation flow.
(8) The control strategy of the working condition unit ensures that the working condition unit operates more stably and reliably, the operation process is more energy-saving, the operation stability of the working condition unit in the reverse temperature working condition test is increased, the operation stability of the reverse temperature working condition test system is further improved, and the temperature control of the reverse temperature working condition test system is more stable and accurate. The working condition unit judges and executes the strategy most suitable for the current test system and the working condition unit mainly according to the water outlet temperature of the water outlet pipeline of the evaporator of the working condition unit and the running capacity of the compressor in the working condition unit. The wheel value strategy is executed, so that the compressors with long running time are started and closed first, the use frequency and the running time of each compressor in the working condition unit are ensured to be similar, and the service life of the compressors is prevented from being shortened because the same compressor is always and fixedly used. The loading strategy of the current duty compressor is executed, so that the service efficiency of the current duty compressor is improved, and the energy is saved. And the machine adding strategy of the working condition unit is executed to determine whether to start a new compressor, so that the working condition unit is ensured not to drop rapidly due to the start of the compressor, and the water outlet temperature of the water outlet pipeline of the evaporator of the working condition unit is prevented from being actually lower than the dead zone temperature, thereby triggering the water temperature fluctuation caused by the low-temperature protection shutdown of the unit. After the actual value of the water outlet temperature reaches the target temperature, executing a shutdown strategy of the working condition unit, and ensuring that the water temperature is not increased due to sudden shutdown of a compressor in the working condition unit. Executing a working condition unit stopping strategy ensures that the working condition unit can be stopped in time under abnormal conditions, and avoids the risk of machine damage.
Drawings
FIG. 1 is a schematic diagram of a system for testing a reverse temperature condition of a chiller according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a system for testing a reverse temperature condition of a chiller according to embodiment 2 of the present invention;
FIG. 3 is a schematic diagram of a system for testing a reverse temperature condition of a chiller according to embodiment 3 of the present invention;
FIG. 4 is a flow chart of a control strategy of a working machine according to embodiment 4 of the present invention;
FIG. 5 is a graph showing the change of the outlet water temperature of the outlet water pipeline of the evaporator of the working condition unit along with time.
Detailed Description
In order to make the technical solution of the present invention clearer and more clear, the present invention is clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments, and those skilled in the art can make equivalent substitutions and conventional inferences to technical features of the technical solution of the present invention without making any creative effort to obtain a solution that falls within the protection scope of the present invention.
Before describing the present invention in detail, some concepts related to the present invention will be briefly described first:
and (3) testing the working condition of the water cooling chiller: and taking the water-cooling water chilling unit to be tested as a test prototype, simulating various working conditions by a water-cooling water chilling unit test system, and detecting the refrigerating and heat release conditions of the evaporator and the condenser of the test prototype in a set time. The working condition test of the water cooling chiller is an indispensable ring in the improvement, research and development and quality inspection processes of the chiller, and can obtain the rated refrigerating capacity, the refrigerating performance coefficient and other important parameters of the test prototype.
The reverse temperature working condition means that: the water inlet temperature of the evaporator is equal to or higher than the water outlet temperature of the condenser, and the water outlet temperature of the evaporator is equal to or higher than the water inlet temperature of the condenser.
Balancing refers to the cancellation of an equal amount of cold and an equal amount of heat.
The test prototype is a water cooling chiller, and comprises a test prototype condenser CO and a test prototype evaporator EV. The test sample machine condenser CO and the test sample machine evaporator EV are integrally connected through a compressor and the like to form a water-cooling water chilling unit, wherein the compressor and the like are omitted in the drawings of the specification for convenience of description and illustration, and the test sample machine condenser CO and the test sample machine evaporator EV of the water-cooling water chilling unit are independently listed. The water inlet and outlet pipelines of the test prototype condenser CO and the test prototype evaporator EV are respectively arranged in the test prototype condenser CO and the test prototype evaporator EV in a penetrating way.
The working condition unit is also a water cooling chiller, and comprises a working condition unit condenser WCCO and a working condition unit evaporator WCEV. And a compressor and other components for helping the working condition unit condenser WCCO and the working condition unit evaporator WCEV to exchange heat are also arranged between the working condition unit condenser WCCO and the working condition unit evaporator WCEV. The water inlet pipeline and the water outlet pipeline of the working condition unit condenser WCCO and the working condition unit evaporator WCEV are also arranged in the working condition unit condenser WCCO and the working condition unit evaporator WCEV in a penetrating way.
A plurality of compressors are arranged in the working condition unit, and at least one compressor is started when the working condition unit runs each time, so that the working condition unit can be ensured not to be incapable of working due to the damage of one compressor. The working condition unit condenser WCCO, the working condition unit evaporator WCEV and each compressor in the working condition unit form a cluster, and the working states of all parts in the cluster are regulated and controlled by the cluster control system.
Example 1
In order to flexibly and efficiently simulate the reverse temperature working condition and realize the efficient and energy-saving test of the performance of the water-cooling chiller under the reverse temperature working condition, the invention designs a reverse temperature working condition test system of the chiller, which is shown in figure 1 and comprises a test subsystem and a heat dissipation subsystem.
The test subsystem is in addition to the operating mode unit, the test machine also comprises a chilled water PUMP PUMP1, a chilled water flowmeter F1, a first temperature sensor T1, a second temperature sensor T2 evaporator water adding PUMP6, water pressure sensor, working condition unit condenser heat recovery heat exchanger HEX1 low temperature side constant temperature TANK, condenser moisturizing PUMP5, test model machine cooling water PUMP2, cooling water flowmeter F2, third temperature sensor T3, fourth temperature sensor T4, operating mode unit evaporimeter water PUMP3 and pipeline.
The heat radiation subsystem comprises a high temperature side of the working condition unit condenser heat recovery heat exchanger HEX1, a cooling TOWER TOWER, a working condition unit condenser water PUMP PUMP4 and a pipeline.
The test subsystem is used for testing the reverse temperature working condition of the test prototype, and the heat dissipation subsystem is used for dissipating redundant heat in the test subsystem to the surrounding environment.
Specific:
the water outlet end of the test sample machine chilled water PUMP PUMP1 is communicated with the water inlet pipeline of the test sample machine evaporator EV, a chilled water flow meter F1 and a first temperature sensor T1 are further arranged on the water inlet pipeline of the test sample machine evaporator EV connected with the water outlet end of the test sample machine chilled water PUMP PUMP1, the chilled water inlet flow of the test sample machine evaporator EV is controlled by adjusting the test sample machine chilled water PUMP PUMP1, namely, the value measured by the chilled water flow meter F1 is recorded as F1, and the value measured by the first temperature sensor T1 is recorded as the chilled water inlet temperature of the test sample machine evaporator EV and is recorded as T1. And a second temperature sensor T2 is arranged on the water outlet pipeline of the test sample machine evaporator EV and close to the test sample machine evaporator EV, and the value measured by the second temperature sensor T2 is recorded as the chilled water outlet temperature of the test sample machine evaporator EV and is recorded as T2. The water inlet end of the chilled water PUMP PUMP1 of the test sample machine is respectively communicated with the water outlet pipeline of the evaporator EV of the test sample machine and the water outlet end of the water PUMP PUMP6 of the evaporator water adding PUMP; the water inlet end of the evaporator water adding PUMP PUMP6 is communicated with a water outlet pipeline at the low temperature side of the working condition unit condenser heat recovery heat exchanger HEX1, and the water inlet pipeline at the low temperature side of the working condition unit condenser heat recovery heat exchanger HEX1 is communicated with a water outlet pipeline of the test sample machine evaporator EV.
Chilled water flows in from a water inlet pipeline of the test sample machine evaporator EV under the control of the test sample machine chilled water PUMP PUMP1, flows out from a water outlet pipeline of the test sample machine evaporator EV, absorbs the cold energy emitted by the test sample machine evaporator EV and cools down, namely T2 < T1, the chilled water flowing out from a water outlet pipeline of the test sample machine evaporator EV is split into two paths after passing through a second temperature sensor T2, one path of chilled water flows into a water inlet pipeline at the low temperature side of the working condition unit condenser heat recovery heat exchanger HEX1 under the control of the evaporator water adding PUMP PUMP6, the low temperature side and the high temperature side of the working condition unit condenser heat recovery heat exchanger HEX1 exchange heat, flows out after absorbing heat by the low temperature chilled water at the low temperature side of the working condition unit condenser heat recovery heat exchanger HEX1, passes through the evaporator water adding PUMP PUMP6, flows out from the water outlet end of the evaporator water adding PUMP PUMP6, returns to the water inlet end of the test sample machine chilled water PUMP PUMP1, and the water temperature flowing out from the water outlet end of the evaporator water adding PUMP MP6 is recorded as T5 > T2; the other path is directly mixed with water flow flowing out from the water outlet end of the evaporator water adding PUMP6 at the water inlet end of the test sample machine chilled water PUMP1 under the control of the test sample machine chilled water PUMP1, flows into the test sample machine chilled water PUMP1, the chilled water flowmeter F1 and the first temperature sensor T1 and flows into the test sample machine evaporator EV from the water inlet pipeline, namely T2 is smaller than T1 and smaller than T5.
The water inlet and outlet pipelines of the test prototype evaporator EV are also provided with water pressure sensors at the parts close to the test prototype evaporator EV, and are used for testing the water inlet and outlet pressure difference of the chilled water flowing through the test prototype evaporator EV, and the water inlet and outlet pressure difference is recorded as delta P1.
The first water outlet end of the constant-temperature water TANK is communicated with the water inlet end of the condenser water supplementing PUMP PUMP5, the water outlet end of the condenser water supplementing PUMP PUMP5 is respectively communicated with the water inlet end of the test sample machine cooling water PUMP PUMP2 and the first water inlet end of the constant-temperature water TANK, and the temperature of the first water inlet end of the constant-temperature water TANK is recorded as t6. The water outlet end of the test sample machine cooling water PUMP PUMP2 is communicated with the water inlet pipeline of the test sample machine condenser CO, and the water inlet pipeline of the test sample machine condenser CO connected with the water outlet end of the test sample machine cooling water PUMP PUMP2 is also provided with a cooling water flowmeter F2 and a fourth temperature sensor T4. And controlling the cooling water inflow flow of the condenser CO of the test sample machine by adjusting the cooling water PUMP PUMP2 of the test sample machine, namely, recording a numerical value measured by the cooling water flowmeter F2 as F2, and recording a numerical value measured by the fourth temperature sensor T4 as the cooling water inflow temperature of the condenser CO of the test sample machine as T4. And a third temperature sensor T3 is arranged on the water outlet pipeline of the condenser CO of the test sample machine, and the value measured by the third temperature sensor T3 is recorded as the cooling water outlet temperature of the condenser CO of the test sample machine and is recorded as T3. If the energy loss of the pipeline is not considered, the first water outlet end temperature of the constant-temperature TANK tank=the water outlet end temperature of the cooling water PUMP2 of the test model machine=the water outlet end temperature of the water supplementing PUMP5 of the condenser=t4. The water outlet pipeline of the condenser CO of the test prototype is communicated with the first water inlet end of the constant-temperature water TANK TANK. The prototype condenser CO was tested for heat release from condensation, so t4 < t3.
The water inlet pipeline and the water outlet pipeline of the condenser CO of the test sample machine are also provided with water pressure sensors at the parts close to the condenser CO of the test sample machine, and the water pressure sensors are used for testing the water inlet and outlet pressure difference of cooling water flowing through the condenser CO of the test sample machine and are marked as delta P2.
The second water outlet end of the constant temperature water TANK TANK is communicated with the water inlet end of the working condition unit evaporator water PUMP PUMP3, the water outlet end of the working condition unit evaporator water PUMP PUMP3 is communicated with the water inlet pipeline of the working condition unit evaporator WCEV, the water outlet pipeline of the working condition unit evaporator WCEV is communicated with the second water inlet end of the constant-temperature water TANK TANK, the temperature and water temperature of the second water outlet end of the constant-temperature water TANK TANK are recorded as t7, and the temperature and water temperature of the second water inlet end of the constant-temperature water TANK TANK are recorded as t8. The working condition unit evaporator WCEV absorbs heat through evaporation, and discharges cold energy, namely t8 is less than t7, and the heat absorbed by the working condition unit evaporator WCEV is transmitted into the working condition unit condenser WCCO through a compressor in the working condition unit.
The water outlet end of the working condition unit condenser water PUMP PUMP4 is communicated with the water inlet pipeline of the working condition unit condenser WCCO, the water outlet pipeline of the working condition unit condenser WCCO is communicated with the high-temperature side water inlet pipeline of the working condition unit condenser heat recovery heat exchanger HEX1, the high-temperature side water outlet pipeline of the working condition unit condenser heat recovery heat exchanger HEX1 is communicated with the water inlet end of the cooling TOWER TOWER, and the water outlet end of the cooling TOWER TOWER is communicated with the water inlet end of the working condition unit condenser water PUMP PUMP 4.
The water PUMP PUMP4 of the working condition unit condenser provides power, the temperature of condensed water flowing into a water inlet pipeline of the working condition unit condenser WCCO is recorded as t9, the temperature of condensed water flowing out of a water outlet pipeline of the working condition unit condenser WCCO is recorded as t10, and then the condensed water flowing through the water inlet and outlet pipelines of the working condition unit condenser WCCO brings the condensed water of the working condition unit condenser WCCO into the high temperature side of the heat recovery heat exchanger HEX1 of the working condition unit condenser, namely t9 is less than t10. And heat exchange is carried out between the high-temperature side and the low-temperature side of the heat recovery heat exchanger HEX1 of the working condition unit, and the temperature of condensed water flowing out of the high-temperature side of the heat recovery heat exchanger HEX1 of the working condition unit is recorded as t11, so that t11 is less than t10. Condensed water flowing out of the high temperature side of the heat recovery heat exchanger HEX1 of the working condition unit enters the cooling TOWER TOWER, heat is released to the surrounding environment by the acceleration of a fan, and low-temperature condensed water cooled by the cooling TOWER TOWER flows out of the cooling TOWER TOWER and flows into the WCCO water inlet pipeline of the working condition unit condenser again. If the energy loss of the pipeline into the environment is not considered, the low-temperature condensed water temperature flowing out of the cooling TOWER power=the condensed water temperature of the water inlet pipeline of the WCCO flowing into the working condition unit condenser=t9.
And (3) recording the central water flow temperature of the constant-temperature water TANK as t12, and presetting a target value of the central water flow temperature of the constant-temperature water TANK. The water flow at the second water outlet end and the second water inlet end of the constant-temperature water TANK brings the cold energy of the working condition unit evaporator WCEV into the constant-temperature water TANK by the power provided by the working condition unit evaporator water PUMP PUMP 3. The condenser water supplementing PUMP PUMP5 provides power, water flow in the constant-temperature water TANK TANK flows out through the first water outlet end and is split into two branches, one branch is controlled by the test sample cooling water PUMP PUMP2 to pass through the test sample cooling water PUMP PUMP2, the cooling water flowmeter F2 and the fourth temperature sensor T4, and then flows in from the water inlet pipeline of the test sample condenser CO and flows out from the water outlet pipeline of the test sample condenser CO; the other path of the high-temperature cooling water is mixed with the high-temperature cooling water flowing out of the water outlet pipeline of the condenser CO of the test sample machine and flows into the first water inlet end of the constant-temperature water TANK TANK, namely t4 is smaller than t6 and smaller than t3, and the heat of the condenser CO of the test sample machine is brought into the constant-temperature water TANK TANK by the water flow of the first water outlet end and the first water inlet end of the constant-temperature water TANK TANK, so that t8 is smaller than t7 and smaller than or equal to t12 and smaller than t4 and smaller than t6. The central water temperature t12 in the constant-temperature water TANK TANK reaches a set target value by controlling the working condition unit evaporator water PUMP PUMP3, the condenser water supplementing PUMP PUMP5 and the test sample machine cooling water PUMP PUMP 2.
In the reverse temperature working condition test of the chiller, controlling a test sample machine chilled water PUMP PUMP1 and a test sample machine cooling water PUMP PUMP2 through a frequency converter to respectively regulate water flow circulating in a test sample machine condenser CO and a test sample machine evaporator EV; according to the measured values of the chilled water flowmeter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2, controlling the water supply quantity of the condenser water supplementing PUMP5 and the evaporator water supplementing PUMP6 through a frequency converter to adjust the chilled water inlet temperature T4 of the test sample machine condenser CO and the chilled water inlet temperature T1 of the test sample machine evaporator EV; the temperature of the constant-temperature water TANK1 is regulated by controlling the WCEV refrigerating output of the working condition unit evaporator.
In the reverse temperature working condition test of the water chilling unit, the heat exchange quantity of the evaporator EV of the test prototype is calculated by measuring the chilled water flow meter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2; and the heat exchange quantity of the condenser CO of the test sample machine is calculated by measuring the cooling water flow meter F2, the cooling water inlet temperature T4 and the cooling water outlet temperature T3.
The specific scene is combined to explain how the cold water unit reverse temperature working condition test system simulates a reverse temperature working condition: in winter, the greenhouse is used for planting watermelons, the temperature in the greenhouse needs to be maintained at 30 ℃ in daytime in the flowering and fruit setting period of the watermelons, and a water cooling chiller is used for cooling the greenhouse. The inlet water temperature of the inlet water pipeline of the test prototype evaporator EV is 30 ℃, the outlet water temperature is 26 ℃, and the inlet water temperature of the inlet water pipeline of the test prototype condenser CO is 18 ℃ and the outlet water temperature is 26 ℃ because the test prototype evaporator EV is used in winter.
The invention realizes the reverse temperature working condition: and controlling the central water temperature t12 in the constant-temperature water TANK TANK to be at a target value of 16 ℃ by controlling the working condition unit evaporator water PUMP PUMP3, the condenser water supplementing PUMP PUMP5 and the test sample machine cooling water PUMP PUMP 2. The water temperature of the water storage part in the constant-temperature water TANK is slightly higher than the central water temperature t12 at a place close to the first water inlet end and the water outlet end; near the second water inlet and outlet ends, the water temperature is slightly lower than the central water temperature t12. The water flow flowing out of the first water outlet end is split, one branch flows into a water inlet pipeline of the condenser CO of the test sample machine, the cooling water inlet temperature t4=18 ℃, then flows out of a water outlet pipeline of the condenser CO of the test sample machine, and the cooling water outlet temperature t3=26 ℃; the other branch is mixed with cooling water flowing out of a water outlet pipeline of the condenser CO of the test sample machine and flows into a first water inlet end of the constant-temperature water TANK TANK, and the water temperature t6 of the first water inlet end is=24 ℃. The water flow temperature t7 = 14 ℃ flowing out of the second water outlet end flows through the water inlet and outlet pipelines of the working condition unit evaporator WCEV, is cooled to t8 = 10 ℃, and flows into the constant-temperature water TANK TANK from the second water inlet end. The working condition unit evaporator WCEV transfers heat to the working condition unit condenser WCCO side, the water inlet temperature of a water inlet pipeline of the working condition unit condenser WCCO is t9=28 ℃, after condensation heat is absorbed, the water outlet temperature of a water outlet pipeline of the working condition unit condenser WCCO is t10=36 ℃, namely, high-temperature condensed water with t10=36 ℃ enters the high-temperature side of the working condition unit condenser heat recovery heat exchanger HEX1, and after heat release is cooled to t11=30 ℃, the heat flows out from the high-temperature side of the working condition unit condenser heat recovery heat exchanger HEX1 and enters the cooling TOWER TOWER. And the cooling tower starts a fan to radiate heat to the periphery, when the condensed water is cooled to 28 ℃, the water PUMP PUMP4 of the working condition unit condenser provides power, and the condensed water is circulated back to the water inlet pipeline of the working condition unit condenser WCCO.
The chilled water inlet temperature of the water inlet pipeline of the test prototype evaporator EV is t1=30 ℃, and the chilled water outlet temperature is t2=26 ℃; a part of chilled water with t2=26 ℃ is split, enters the low-temperature side of the heat recovery heat exchanger HEX1 of the working condition unit condenser, absorbs heat exchange of the high-temperature side of the heat recovery heat exchanger HEX1 of the working condition unit condenser, flows out of the low-temperature side of the heat recovery heat exchanger HEX1 of the working condition unit condenser after the temperature is raised to t5=34 ℃, is supplied with power by the water PUMP PUMP6 of the evaporator, becomes high-temperature chilled water with t1=30 ℃ after water flow with t2=26 ℃ and the rest of chilled water are mixed, is supplied with power by the chilled water PUMP PUMP1 of the test prototype, and flows into the water inlet pipeline of the test prototype evaporator EV again.
According to the cold water unit reverse temperature working condition testing system, the cold energy in the constant-temperature water TANK is substituted into the testing sample machine condenser CO through the condenser water supplementing PUMP PUMP5, and the condensing energy brought to the constant-temperature water TANK by the testing sample machine condenser CO is balanced through the working condition unit evaporator WCEV and the working condition unit evaporator water PUMP PUMP 3. The cold energy of the test sample machine evaporator EV is brought into the low-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 through the evaporator water adding PUMP PUMP6, the heat in the working condition machine set condenser WCCO is brought into the high-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 through the working condition machine set condenser water PUMP PUMP4, and the high-temperature side and the low-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 exchange heat, so that the water inlet temperature T1 of the test sample machine evaporator EV is equal to or higher than the water outlet temperature T3 of the test sample machine condenser CO, and the water outlet temperature T2 of the test sample machine evaporator EV is equal to or higher than the water inlet temperature T4 of the test sample machine CO, and the reverse temperature working condition is realized. When the cold water cooling unit is tested under the reverse temperature working condition, redundant heat in the working condition unit condenser WCCO is connected with the cooling TOWER TOWER through a pipeline and is discharged to the surrounding environment.
The cold water machine set reverse temperature working condition testing system provided by the invention recovers the condensation heat generated by the working condition machine set condenser WCCO, and is reused in the testing subsystem, the reverse temperature working condition is simulated, and only a small part of heat is dissipated into the surrounding environment in a cooling way of the cooling tower.
Example 2
The invention designs a reverse temperature working condition test system of a water chilling unit, which is shown in fig. 2 and comprises a test subsystem and a heat dissipation subsystem.
Besides the working condition unit, the test subsystem further comprises a test model machine chilled water PUMP PUMP1, a chilled water flowmeter F1, a first temperature sensor T1, a second temperature sensor T2, a chilled water temperature two-way regulating valve CV1, a water pressure sensor, a low-temperature side of a working condition unit condenser heat recovery heat exchanger HEX1, a working condition unit cold recovery heat exchanger HEX2, a cooling water temperature two-way regulating valve CV2, a test model machine cooling water PUMP PUMP2, a cooling water flowmeter F2, a third temperature sensor T3, a fourth temperature sensor T4, a working condition unit evaporator water PUMP PUMP3 and pipelines.
The heat radiation subsystem comprises a working condition unit condenser heat recovery heat exchanger HEX1 high temperature side, a cooling TOWER TOWER, a working condition unit condenser water PUMP PUMP4 and a pipeline.
The test subsystem is used for testing the reverse temperature working condition of the test prototype, and the heat dissipation subsystem is used for dissipating redundant heat in the test subsystem to the surrounding environment.
Compared with the embodiment 1, in the embodiment 2, the evaporator water adding PUMP6 in the embodiment 1 is replaced by a chilled water temperature two-way regulating valve CV1, the constant-temperature water TANK is replaced by a working condition unit cold energy recovery heat exchanger HEX2, and the condenser water adding PUMP5 is replaced by a cooling water temperature two-way regulating valve CV2. Other parts that are the same as those in embodiment 1 will not be described in detail, and different parts will be described below:
the water inlet end of the chilled water temperature two-way regulating valve CV1 is communicated with a water outlet pipeline at the low temperature side of the heat recovery heat exchanger HEX1 of the working condition unit condenser, and the water outlet end of the chilled water temperature two-way regulating valve CV1 and a water outlet pipeline branch of the test prototype evaporator EV are connected in parallel with the water inlet end of the test prototype chilled water PUMP PUMP 1; the water flow flowing out from the water outlet end of the chilled water temperature two-way regulating valve CV1 is mixed with the low-temperature chilled water flowing out from the water outlet pipeline branch of the test sample machine evaporator EV, and then flows into the test sample machine chilled water PUMP PUMP1 from the water inlet end of the test sample machine chilled water PUMP PUMP1. And (3) recording the water flow temperature of the water outlet end of the chilled water temperature two-way regulating valve CV1 as t13, wherein t2 is smaller than t1 and smaller than t13.
The low-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger HEX2 is communicated with the water inlet end of the working condition unit evaporator water PUMP PUMP3, the water outlet end of the working condition unit evaporator water PUMP PUMP3 is communicated with the water inlet pipeline of the working condition unit evaporator WCEV, and the water outlet pipeline of the working condition unit evaporator WCEV is communicated with the low Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX 2. The low Wen Cejin water temperature of the working condition unit cold recovery heat exchanger HEX2 is recorded as t14, and the low-temperature side water outlet temperature is recorded as t15. The working condition unit evaporator WCEV absorbs heat and discharges cold energy through evaporation, the low-temperature side and the high-temperature side of the working condition unit cold energy recovery heat exchanger HEX2 exchange heat, and water flow flowing through the low-temperature side of the working condition unit cold energy recovery heat exchanger HEX2 absorbs heat, namely t14 is less than t13.
The high-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger HEX2 is communicated with the water inlet end of the cooling water temperature two-way regulating valve CV2, and the water outlet end of the cooling water temperature two-way regulating valve CV2 is respectively communicated with the water inlet end of the test sample machine cooling water PUMP PUMP2 and the high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX 2. And (3) recording the water flow temperature flowing out of a high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX2 as t15, and if the energy loss of the pipeline is not considered to the environment, controlling the water outlet temperature of the high temperature side of the working condition unit cold recovery heat exchanger HEX2 to be equal to the water outlet end temperature of the test sample cooling water PUMP PUMP2 to be equal to the water inlet end temperature of the cooling water temperature two-way regulating valve CV2 to be equal to t4. The water outlet pipeline of the condenser CO of the test prototype is communicated with the high Wen Cejin water pipeline of the cold recovery heat exchanger HEX2 of the working condition unit. The prototype condenser CO was tested for heat release from condensation, so t4 < t3.
The working condition unit evaporator water PUMP PUMP3 provides power, and the low-temperature side water outlet pipeline and the water inlet pipeline of the working condition unit cold recovery heat exchanger HEX2 bring the cold of the working condition unit evaporator WCEV into the low-temperature side of the working condition unit cold recovery heat exchanger HEX 2. The cooling water temperature two-way regulating valve CV2 is controlled, so that the water flow flowing out of the high-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger HEX2 is divided into two branches, and one branch is controlled by the test sample cooling water PUMP PUMP2 to flow in from the water inlet pipeline of the test sample condenser CO and flow out from the water outlet pipeline of the test sample condenser CO through the test sample cooling water PUMP PUMP2, the cooling water flowmeter F2 and the fourth temperature sensor T4; the other path of the high-temperature cooling water is mixed with the high-temperature cooling water flowing out of the water outlet pipeline of the condenser CO of the test sample machine and flows into the water inlet pipeline at the high-temperature side of the cold recovery heat exchanger HEX2 of the working condition machine set, and the condensation heat of the condenser CO of the test sample machine is brought into the high-temperature side of the cold recovery heat exchanger HEX2 of the working condition machine set, namely t4 is less than t15 and less than t3.
In the reverse temperature working condition test of the chiller, controlling a test sample machine chilled water PUMP PUMP1 and a test sample machine cooling water PUMP PUMP2 through a frequency converter to respectively regulate water flow circulating in a test sample machine condenser CO and a test sample machine evaporator EV; according to the measured values of the chilled water flowmeter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2, the valve opening of the chilled water temperature two-way regulating valve CV1 and the valve opening of the cooling water temperature two-way regulating valve CV2 are controlled to regulate the chilled water inlet temperature T4 of the test sample machine condenser CO and the chilled water inlet temperature T1 of the test sample machine evaporator EV.
In the reverse temperature working condition test of the water chilling unit, the heat exchange quantity of the evaporator EV of the test prototype is calculated by measuring the chilled water flow meter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2; and the heat exchange quantity of the condenser CO of the test sample machine is calculated by measuring the cooling water flow meter F2, the cooling water inlet temperature T4 and the cooling water outlet temperature T3.
According to the cold water unit reverse temperature working condition testing system, the condensation heat of the condenser CO of the testing prototype is brought into the high temperature side of the cold energy recovery heat exchanger HEX2 of the working condition unit through the cooling water temperature two-way regulating valve CV2, the evaporation cold energy generated by the evaporator WCEV of the working condition unit is brought into the low temperature side of the cold energy recovery heat exchanger HEX2 of the working condition unit through the water PUMP PUMP3 of the working condition unit, and the high temperature side and the low temperature side of the cold energy recovery heat exchanger HEX2 of the working condition unit exchange heat, so that the condensation heat generated by the condenser CO of the testing prototype is balanced, and the water inlet temperature of the condenser CO entering the testing prototype is reduced. The cold energy of the test sample machine evaporator EV is brought into the low-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 through the chilled water temperature two-way regulating valve CV1, the heat in the working condition machine set condenser WCCO is brought into the high-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 through the working condition machine set condenser water PUMP PUMP4, the high-temperature side and the low-temperature side of the working condition machine set condenser heat recovery heat exchanger HEX1 exchange heat, so that the water inlet temperature T1 of the test sample machine evaporator EV is equal to or higher than the water outlet temperature T3 of the test sample machine condenser CO, and the water outlet temperature T2 of the test sample machine evaporator EV is equal to or higher than the water inlet temperature T4 of the test sample machine condenser CO, and the reverse temperature working condition is realized. When the cold water cooling unit is tested under the reverse temperature working condition, redundant heat in the working condition unit condenser WCCO is connected with the cooling TOWER TOWER through a pipeline and is discharged to the surrounding environment.
The cold water machine set reverse temperature working condition testing system provided by the invention recovers the condensation heat generated by the working condition machine set condenser WCCO, and is reused in the testing subsystem, the reverse temperature working condition is simulated, and only a small part of redundant heat is dissipated into the surrounding environment in a cooling way of the cooling tower. Compared with the embodiment 1 in which the evaporation cooling capacity generated by the working condition unit evaporator WCEV is that the heat convection is generated in the constant temperature water TANK through the second water inlet and outlet ends of the constant temperature water TANK and the condensation heat generated by the test sample machine condenser CO through the first water inlet and outlet ends of the constant temperature water TANK, the central temperature of the constant temperature water TANK is kept at the set temperature, so that the condensation heat generated by the test sample machine condenser CO is balanced, the evaporation cooling capacity generated by the working condition unit evaporator WCEV in the embodiment balances the condensation heat generated by the test sample machine condenser CO through the heat exchange of the working condition unit cooling capacity recovery heat exchanger HEX2, the influence of the water storage inertia in the water TANK on the cooling and heating capacity balance and temperature regulation speed in the whole test system is avoided, and the temperature regulation of the cold water machine reverse temperature working condition test system is more sensitive.
Example 3
The invention designs a reverse temperature working condition testing system of a water chilling unit, which is shown in figure 3 and comprises a testing subsystem and a heat dissipation subsystem.
The test subsystem comprises a test sample machine chilled water PUMP PUMP1, a chilled water flow meter F1, a first temperature sensor T1, a second temperature sensor T2, a cooling water temperature three-way regulating valve CV3, a water pressure sensor, a chilled water temperature three-way regulating valve CV4, a test sample machine chilled water PUMP PUMP2, a cooling water flow meter F2, a third temperature sensor T3, a fourth temperature sensor T4, a sixteenth temperature sensor T16, a working condition machine evaporator water PUMP PUMP3 and pipelines.
The heat radiation subsystem comprises a cooling TOWER TOWER, a working condition unit condenser water PUMP4 and a pipeline.
The test subsystem is used for testing the reverse temperature working condition of the test prototype, and the heat dissipation subsystem is used for dissipating redundant heat in the test subsystem to the surrounding environment.
Compared with the embodiment 1, in the embodiment 3, the evaporator water adding PUMP6 and the working condition unit condenser heat recovery heat exchanger HEX1 in the embodiment 1 are replaced by a chilled water temperature three-way regulating valve CV4, and the constant temperature water TANK TANK and the condenser water adding PUMP5 are replaced by a cooling water temperature three-way regulating valve CV3.
Compared with the embodiment 2, in the embodiment 3, the chilled water temperature two-way regulating valve CV1 and the working condition unit condenser heat recovery heat exchanger HEX1 in the embodiment 2 are replaced by the chilled water temperature three-way regulating valve CV4, and the working condition unit cold recovery heat exchanger HEX2 and the cooling water temperature two-way regulating valve CV2 are replaced by the cooling water temperature three-way regulating valve CV3.
The following describes the different parts of this embodiment and embodiment 1 specifically on the basis of embodiment 1, and the same parts are not repeated:
the cooling water temperature three-way regulating valve CV3 comprises a water inlet end and two water outlet ends, namely a third water inlet end A1, a third water outlet end A2 and a fourth water outlet end A3; the cooling water flowing out from the water outlet pipeline of the condenser CO of the test prototype is split into two branches, namely a first branch A4 and a second branch A5.
The water outlet pipeline of the working condition unit evaporator WCEV is communicated with the third water inlet end A1 of the cooling water temperature three-way regulating valve CV3, the fourth water outlet end A3 of the cooling water temperature three-way regulating valve CV3 is connected with the first branch A4 in parallel with the water inlet end of the test sample cooling water PUMP PUMP2, the third water outlet end A2 of the cooling water temperature three-way regulating valve CV3 is connected with the second branch A5 in parallel with the water inlet end of the working condition unit evaporator water PUMP PUMP3, and the water outlet end of the working condition unit evaporator water PUMP PUMP3 is communicated with the water inlet pipeline of the working condition unit evaporator WCEV. The water PUMP PUMP3 of the working condition unit evaporator provides water circulating power, low-temperature water flowing out of a water outlet pipeline of the working condition unit evaporator WCEV flows into the cooling water temperature three-way regulating valve CV3 from the third water inlet end A1, and is split from the third water outlet end A2 and the fourth water outlet end A3 respectively, the low-temperature water flowing out of the water outlet end A3 of the cooling water temperature three-way regulating valve CV3 is mixed with high-temperature cooling water flowing out of the first branch A4 and flows into the test cooling water PUMP PUMP2, namely, part of cold energy generated by the working condition unit evaporator WCEV is directly brought into the test condenser CO through the fourth water outlet end A3, so that the cooling water inlet temperature of the water inlet pipeline of the test sample machine condenser CO is reduced; the low-temperature water flowing out from the third water outlet end A2 of the cooling water temperature three-way regulating valve CV3 is mixed with the high-temperature cooling water flowing out from the second branch A5 and flows into the water inlet pipeline of the working condition unit evaporator WCEV, namely, a part of heat generated by the condenser CO of the test sample machine is directly brought into the working condition unit evaporator WCEV through the second branch A5, and after the part of heat is balanced in the working condition unit evaporator WCEV, the low-temperature water is changed into low-temperature water again and flows out from the water outlet pipeline of the working condition unit evaporator WCEV.
The chilled water temperature three-way regulating valve CV4 comprises a water inlet end and two water outlet ends, namely a fifth water inlet end B1, a fifth water outlet end B2 and a sixth water outlet end B3; the cooling water flowing out from the water outlet pipeline of the test prototype evaporator EV is split into two branches, namely a third branch B4 and a fourth branch B5.
The water outlet pipeline of the working condition unit condenser WCCO is communicated with a fifth water inlet end B1 of the chilled water temperature three-way regulating valve CV4, a sixth water outlet end B3 of the chilled water temperature three-way regulating valve CV4 is connected with a third branch B4 in parallel at the water inlet end of the chilled water PUMP PUMP1 of the test model machine, a fifth water outlet end B2 of the chilled water temperature three-way regulating valve CV4 is connected with a fourth branch B5 in parallel at the water inlet end of the cooling TOWER TOWER, the water outlet end of the cooling TOWER TOWER is communicated with the water inlet end of the working condition unit condenser water PUMP PUMP4, and the water outlet end of the working condition unit condenser water PUMP PUMP4 is communicated with the water inlet pipeline of the working condition unit condenser WCCO. The control working condition unit condenser water PUMP4 provides water circulation power, high-temperature water flowing out of a water outlet pipeline of the working condition unit condenser WCCO flows into the chilled water temperature three-way regulating valve CV4 from the fifth water inlet end B1, and is respectively split from the fifth water outlet end B2 and the sixth water outlet end B3, the high-temperature water flowing out of the sixth water outlet end B3 of the chilled water temperature three-way regulating valve CV4 is mixed with low-temperature chilled water flowing out of the third branch B4 and flows into the test sample machine chilled water PUMP PUMP1, namely, part of condensing heat generated by the working condition unit condenser WCCO is directly brought into the test sample machine evaporator EV through the sixth water outlet end B3, and the chilled water inlet temperature of the test sample machine evaporator EV water inlet pipeline is improved; after the high-temperature water flowing out from the fifth water outlet end B2 of the chilled water temperature three-way regulating valve CV4 is mixed with the low-temperature chilled water flowing out from the fourth branch B5, the mixture flows into the water inlet end of the cooling TOWER TOWER, namely, a part of cold energy generated by the test sample machine evaporator EV balances out a part of condensation heat of the working condition unit condenser WCCO brought out by the fifth water outlet end B2 through the fourth branch B5. After the condensed water in the cooling TOWER TOWER releases heat to the surrounding environment, the temperature is reduced again to become low-temperature condensed water, the low-temperature condensed water flows out from the water outlet end of the cooling TOWER TOWER and enters the water inlet pipeline of the working condition unit condenser WCCO again.
In the reverse temperature working condition test of the chiller, controlling a test sample machine chilled water PUMP PUMP1 and a test sample machine cooling water PUMP PUMP2 through a frequency converter to respectively regulate water flow circulating in a test sample machine condenser CO and a test sample machine evaporator EV; according to the measured values of the chilled water flowmeter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2, the valve opening of the cooling water temperature three-way regulating valve CV3 and the valve opening of the chilled water temperature three-way regulating valve CV4 are controlled to regulate the cooling water inlet temperature T4 of the test sample machine condenser CO and the chilled water inlet temperature T1 of the test sample machine evaporator EV.
In the reverse temperature working condition test of the water chilling unit, the heat exchange quantity of the evaporator EV of the test prototype is calculated by measuring the chilled water flow meter F1, the chilled water inlet temperature T1 and the chilled water outlet temperature T2; and the heat exchange quantity of the condenser CO of the test sample machine is calculated by measuring the cooling water flow meter F2, the cooling water inlet temperature T4 and the cooling water outlet temperature T3.
According to the cold water unit reverse temperature working condition testing system, the valve opening of the cooling water temperature three-way regulating valve CV3 is controlled, so that the evaporation cold energy generated by the working condition unit evaporator WCEV carried out by the working condition unit evaporator water PUMP PUMP3 is divided into two parts, and one part of evaporation cold energy is directly carried into the test sample machine condenser CO through the heat convection of water flow, so that the condensation heat generated by the test sample machine condenser CO is balanced, and the water inlet temperature entering the test sample machine condenser CO is reduced; after the cold water carrying the other part of evaporated cold energy is mixed with the high-temperature cooling water which does not directly enter the CO water inlet pipeline of the condenser of the test sample machine, the condensation heat carried by the high-temperature cooling water is balanced, and the mixture returns to the working condition unit evaporator WCEV. Similarly, the cold water unit reverse temperature working condition test system divides the condensation heat generated by the working condition unit condenser WCCO carried by the working condition unit condenser water PUMP PUMP4 into two parts by controlling the valve opening of the refrigerating water temperature three-way regulating valve CV4, and one part of the condensation heat is directly carried into the test model machine evaporator EV by the heat convection of water flow to balance the evaporation cold energy generated by the test model machine evaporator EV; after the hot water carrying the other part of condensation heat is mixed with the low-temperature chilled water which does not directly enter the EV water inlet pipeline of the test sample machine evaporator, the evaporated cold energy carried by the low-temperature chilled water is balanced, the mixture enters the cooling TOWER TOWER, and if the condensed water in the cooling TOWER TOWER also contains redundant heat, the condensed water is discharged to the surrounding environment.
The cold water machine set reverse temperature working condition testing system provided by the invention recovers the condensation heat generated by the working condition machine set condenser WCCO, and is reused in the testing subsystem, the reverse temperature working condition is simulated, and only a small part of redundant heat is dissipated into the surrounding environment in a cooling way of the cooling tower. Compared with the embodiment 1 in which the evaporation cooling capacity generated by the working condition unit evaporator WCEV is that the heat convection is generated in the constant temperature water TANK through the second water inlet and outlet ends of the constant temperature water TANK and the condensation heat generated by the test sample machine condenser CO through the first water inlet and outlet ends of the constant temperature water TANK, the center temperature of the constant temperature water TANK is kept at the set temperature, so that the condensation heat generated by the test sample machine condenser CO is balanced, the evaporation cooling capacity generated by the working condition unit evaporator WCEV in the embodiment balances the condensation heat generated by the test sample machine condenser CO through the heat exchange of the working condition unit cooling capacity recovery heat exchanger HEX2, and the influence of the inertia of the water storage in the water TANK on the cooling and heating capacity balance and the temperature regulation speed in the whole test system is avoided. Compared with embodiment 2, the cold and heat quantity in the embodiment is directly exchanged in the test subsystem in a water flow heat convection mode, so that energy loss caused by setting a constant-temperature water tank and a heat exchanger is avoided, the temperature regulation of the cold water unit reverse temperature working condition test system is more sensitive, the energy utilization efficiency is further improved, and the purposes of energy conservation and concentration are achieved by optimizing the heating and heat dissipation flow.
Example 4
In the test system, as the working condition machine directly participates in the reverse temperature working condition test of the water-cooling chiller, as shown in fig. 4, the invention also provides a working condition machine set control strategy, so that the running stability of the working condition machine set in the reverse temperature working condition test is improved, and the stability of the reverse temperature working condition test system is further improved:
s1, after a working condition unit receives a starting signal, a cluster control system performs fault detection on all devices in the working condition unit, and after confirming that no fault exists, the cluster control system determines the on-off sequence of each compressor in the working condition unit as an on-duty compressor or manually designates one on-duty compressor according to a wheel value strategy.
Round value strategy: the cluster control system records the running time of each compressor in the working condition unit from the first day of each month, designates the compressor with the shortest running time as the duty compressor, arranges the starting sequence of each unloaded running compressor in the working condition unit according to the sequence from the short running time to the long running time, and arranges the shutdown sequence of each loaded running compressor in the working condition unit according to the sequence from the long running time to the short running time.
S2, starting the compressor on duty, and running one of the following strategies by the working condition unit: the loading strategy of the current duty compressor, the loading strategy of the working condition unit and the reducing strategy of the working condition unit.
S2, the following contents are also included:
loading strategy of current duty compressor:
the compressor adopts variable frequency control, and when loading, whether the current on-duty compressor is allowed to be loaded is determined through the change rate of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV, and the loading rate of the current on-duty compressor is controlled by the unit.
The method comprises the steps of (1) presetting a water outlet temperature target value Tsp of a water outlet pipeline of a working condition unit evaporator WCEV, acquiring a water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV once per second by a cluster control system, recording the moment when the cluster control system starts to acquire the water outlet temperature actual value of the water outlet pipeline of the working condition unit evaporator WCEV as 0 th second, and calculating the water temperature change rate Vpv of the nth second according to the water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV acquired by the cluster control system:
tpv (i) represents the actual value of the outlet water temperature of the ith second, tpv (i+1) represents the actual value of the outlet water temperature of the (i+1) th second, wherein i is more than or equal to 0 and less than or equal to n, and i is an integer;
each compressor in the working condition unit adopts variable frequency control, each compressor corresponds to a set of PID regulating function, and Tpv is close to Tsp by continuously adjusting Tpv of the cluster control system:
If Tpv-Tsp is more than or equal to 10 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV to Vmax=1 ℃/min, judges whether Vpv is less than Vmax, allows the current duty compressor to load if Vpv is less than Vmax, and prohibits the current duty compressor from loading if Vpv is not less than Vmax;
if the temperature is more than or equal to 5 ℃ and less than Tpv-Tsp is less than 10 ℃, the cluster control system sets the maximum rate of change Vmax=0.5 ℃/min of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether the Vpv is less than Vmax, allows the current duty compressor to load if the Vpv is less than Vmax, and prohibits the current duty compressor from loading if the Vpv is less than Vmax;
if Tpv-Tsp is less than 5 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature Vmax=0.2 ℃/min of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether Vpv is less than Vmax, allows the current duty compressor to load if the Vpv is less than Vmax, and prohibits the current duty compressor from loading if the Vpv is not less than Vmax;
and (3) adding a working condition unit:
Sb1, when the cluster control system detects that the running capacity of the running compressor in the working condition unit reaches more than 95% of the full-load running capacity within a first set time threshold delta t1, the cluster control system starts to calculate whether the working condition unit meets the machine adding condition;
in the present embodiment, the first set time threshold Δt1 is set to 10min;
sb2, the cluster control system calculates the target temperature difference delta T1 = Tpv-Tsp between the actual outlet water temperature value Tpv of the outlet water pipeline of the evaporator WCEV of the current working condition unit and the outlet water temperature target value Tsp, and returns to Sb1 if the current target temperature difference delta T1 is lower than the first set temperature difference value threshold;
if the current target temperature difference delta T1 is above the first set temperature difference threshold value, the cluster control system calculates a second change difference delta T2= | Tpv-Tpv '| between an actual outlet water temperature value Tpv of an outlet pipeline of the working condition unit evaporator WCEV at the moment and an actual outlet water temperature value Tpv' of the outlet pipeline of the working condition unit evaporator WCEV passing through a second set time threshold delta T2 from the moment, and if the second change difference delta T2 is above the second set temperature difference threshold value, returning to Sb1; if the second variation difference value delta T2 is lower than a second set temperature difference value threshold value, the working condition unit meets the machine adding condition;
Sb3, the working condition unit increases the running compressors according to the wheel strategy or the manually specified starting sequence;
in this embodiment, the first set temperature difference threshold of the current target temperature difference Δt1 is set to 2 ℃, the second set time threshold Δt2 is set to 5min, and the second set temperature difference threshold of the second variation difference Δt2 is set to 1 ℃.
In step Sb2, when the target temperature difference Δt1 is above the first set temperature difference threshold, if the second variation difference Δt2 is also above the second set temperature difference threshold, that is, the outlet water temperature of the outlet water pipeline of the working condition unit evaporator WCEV is a certain distance from the outlet water temperature target value Tsp, but the outlet water temperature of the outlet water pipeline of the working condition unit evaporator WCEV varies rapidly, that is, the outlet water temperature actual value of the outlet water pipeline of the working condition unit evaporator WCEV will reach the outlet water temperature target value soon, so that the machine adding is not performed. On the contrary, when the target temperature difference Δt1 is above the first set temperature difference threshold, if the second change difference Δt2 is still lower than the second set temperature difference threshold, that is, the outlet water temperature of the outlet water pipeline of the working condition unit evaporator WCEV is not only a certain difference from the outlet water temperature target value Tsp, but also the outlet water temperature of the outlet water pipeline of the working condition unit evaporator WCEV is changed slowly, that is, the outlet water temperature actual value of the outlet water pipeline of the working condition unit evaporator WCEV can reach the outlet water temperature target value only by a long time under the condition that the number of compressors in operation of the working condition unit is not increased, so that the machine adding is needed.
And (3) reducing the working condition unit:
sc1, the cluster control system detects that at least one compressor in the working condition unit is running, if the running capacity of the at least one compressor is maintained below 40% of the full-load running capacity within a third set time threshold delta t3, the cluster control system starts to calculate whether the working condition unit meets the condition of reducing the running speed;
in the present embodiment, the third set time threshold Δt3 is set to 10min;
sc2, the cluster control system judges whether the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator WCEV is below the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, and if the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator WCEV is higher than the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, the process returns to Sc1;
if the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV is below the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, the cluster control system calculates the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV at the moment and a fourth variation difference value delta T4= | Tpv-Tpv | between the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV passing through a third set time threshold delta T3 from the moment, and if the fourth variation difference value delta T4 is above a fourth set temperature difference value threshold, the cluster control system returns to Sc1; if the fourth variation difference value delta T4 is lower than a fourth set temperature difference value threshold value, the working condition unit meets the condition of reducing the machine;
Sc3, the cluster control system reduces the non-duty compressors running in the working condition unit according to a wheel strategy or a manually specified shutdown sequence, and ensures that the running capacity of the duty compressors is controlled to be not lower than 40% of the full-load running capacity; the cluster control system only turns off one non-duty compressor at a time and returns to Sc1;
in the present embodiment, the fourth variation difference Δt4 is set to 1 ℃ at the fourth set temperature difference value threshold.
S3, working condition unit shutdown strategies: when the water flow of the working condition unit evaporator water PUMP PUMP3 and/or the working condition unit condenser water PUMP PUMP4 is cut off, or the actual value Tpv of the water outlet temperature of the water outlet pipeline of the current working condition unit evaporator WCEV is at the dead zone temperature T ref When the working condition unit is in the following, the working condition unit is stopped, wherein T is ref ＝Tsp-5℃。
As shown in fig. 5, the graph is a graph simulating the change of the outlet water temperature of the outlet water pipeline of the evaporator of the working condition unit under the reverse temperature working condition along with time, and the abscissa is time, which represents the running time of the working condition unit after being started, and the unit is: second, wherein the second is; the ordinate is water temperature, which indicates the water outlet temperature of the water outlet pipeline of the working condition unit evaporator, and the unit is: degrees celsius. The working condition unit adopts the control strategy of the working condition unit, the time change curve of the outlet water temperature of the evaporator is represented by a solid line and is recorded as a curve 1; the time change curve of the temperature of the water outlet of the evaporator of the working condition unit by only adopting the PID control method in the prior art is represented by a dotted line and is marked as a curve 2.
The water outlet temperature target value Tsp is set to be 6.8 ℃, and it can be seen that the curve 1 can reach the water outlet temperature target value in a shorter time relative to the curve 2, and the fluctuation range is very small after the curve 1 reaches the water outlet temperature target value, so that the water outlet temperature of the water outlet pipeline of the evaporator of the working condition unit is controlled more stably and accurately by verifying the working condition unit control strategy, the operation of the working condition unit in the reverse temperature working condition test is more stable and reliable, and meanwhile, the operation stability and the temperature regulation accuracy of a cold water unit reverse temperature working condition test system using the control strategy are also increased.
The control strategy of the working condition unit is applied to the cold water unit reverse temperature working condition test system in the embodiments 1-3, so that the working condition unit operates more stably and reliably and the operation process is more energy-saving. The working condition unit judges and executes the strategy most suitable for the current test system and the working condition unit mainly according to the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV and the running capacity of the compressor in the working condition unit. The wheel value strategy is executed, so that the compressors with long running time are started and closed first, the use frequency and the running time of each compressor in the working condition unit are ensured to be similar, and the service life of the compressors is prevented from being shortened because the same compressor is always and fixedly used. The loading strategy of the current duty compressor is executed, so that the service efficiency of the current duty compressor is improved, and the energy is saved. Executing the charging strategy of the working condition unit to determine whether to start a new compressor, ensuring that the working condition unit cannot drop rapidly due to the fact that the water temperature is reduced sharply when the compressor is started, and avoiding that the actual value Tpv of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV is at the dead zone temperature T ref And then, triggering the water temperature fluctuation caused by the low-temperature protection shutdown of the unit. After the actual value Tpv of the outlet water temperature reaches the target temperature, executing a shutdown strategy of the working condition unit, and ensuring that the water temperature is not increased due to sudden shutdown of a compressor in the working condition unit. Executing a working condition unit stopping strategy ensures that the working condition unit can be stopped in time under abnormal conditions, and avoids the risk of machine damage.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art. It should also be noted that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention, and the components or steps in the embodiment of the present invention may be disassembled and/or assembled again, and the disassembly and/or assembly should be considered as equivalent schemes of the present application, which fall within the protection scope of the present invention.
Claims (4)
1. The reverse temperature working condition test system of the water chilling unit is characterized by comprising a test subsystem for simulating a reverse temperature working condition and testing a test prototype and a heat dissipation subsystem for discharging heat in the test subsystem into the surrounding environment;
the test prototype comprises a test prototype evaporator EV and a test prototype condenser CO;
The test subsystem comprises a working condition unit, a test prototype chilled water PUMP PUMP1, a test prototype cooling water PUMP PUMP2 and a pipeline;
the working condition unit comprises a working condition unit condenser WCCO and a working condition unit evaporator WCEV;
the heat radiation subsystem comprises a cooling TOWER TOWER, a working condition unit condenser water PUMP4 and a pipeline;
the water outlet end of the test sample machine chilled water PUMP PUMP1 is communicated with the water inlet pipeline of the test sample machine evaporator EV, and the water inlet end of the test sample machine chilled water PUMP PUMP1 is communicated with the water outlet pipeline of the test sample machine evaporator EV; the water outlet end of the test sample machine cooling water PUMP PUMP2 is communicated with the water inlet pipeline of the test sample machine condenser CO, and the water inlet end of the test sample machine cooling water PUMP PUMP2 is communicated with the water outlet pipeline of the test sample machine condenser CO;
the working condition unit evaporator WCEV brings evaporation cooling capacity into the test prototype condenser CO by connecting a pipeline in parallel between the water inlet end of the test prototype cooling water PUMP PUMP2 and the water outlet pipeline of the test prototype condenser CO;
the working condition unit condenser WCCO brings a part of condensation heat into the test sample machine evaporator EV through a pipeline connected in parallel between the water inlet end of the test sample machine chilled water PUMP PUMP1 and the water outlet pipeline of the test sample machine evaporator EV; the working condition unit condenser WCCO is further provided with a working condition unit condenser water PUMP PUMP4 and a cooling TOWER TOWER in series on a pipeline, and the other part of condensation heat is discharged into the surrounding environment through the cooling TOWER TOWER;
The test subsystem further comprises a chilled water temperature two-way regulating valve CV1, a low-temperature side of a working condition unit condenser heat recovery heat exchanger HEX1, a working condition unit cold recovery heat exchanger HEX2, a cooling water temperature two-way regulating valve CV2 and a working condition unit evaporator water PUMP PUMP3;
the heat radiation subsystem also comprises a high temperature side of a working condition unit condenser heat recovery heat exchanger HEX 1;
the water inlet end of the chilled water PUMP PUMP1 of the test model machine is also communicated with the water outlet end of the chilled water temperature two-way regulating valve CV1, the water inlet end of the chilled water temperature two-way regulating valve CV1 is communicated with a water outlet pipeline at the low temperature side of the heat recovery heat exchanger HEX1 of the condenser of the working condition machine set, and the water inlet pipeline at the low temperature side of the heat recovery heat exchanger HEX1 of the working condition machine set is communicated with a water outlet pipeline of the evaporator EV of the test model machine;
the high-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger HEX2 is communicated with the water inlet end of the cooling water temperature two-way regulating valve CV2, the water outlet end of the cooling water temperature two-way regulating valve CV2 is respectively communicated with the water inlet end of the test prototype cooling water PUMP PUMP2 and the high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX2, and the water outlet pipeline of the test prototype condenser CO is communicated with the high Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX 2;
The low-temperature side water outlet pipeline of the working condition unit cold recovery heat exchanger HEX2 is communicated with the water inlet end of the working condition unit evaporator water PUMP PUMP3, the water outlet end of the working condition unit evaporator water PUMP PUMP3 is communicated with the water inlet pipeline of the working condition unit evaporator WCEV, and the water outlet pipeline of the working condition unit evaporator WCEV is communicated with the low Wen Cejin water pipeline of the working condition unit cold recovery heat exchanger HEX 2;
the water outlet end of the working condition unit condenser water PUMP PUMP4 is communicated with the water inlet pipeline of the working condition unit condenser WCCO, the water outlet pipeline of the working condition unit condenser WCCO is communicated with the high-temperature side water inlet pipeline of the working condition unit condenser heat recovery heat exchanger HEX1, the high-temperature side water outlet pipeline of the working condition unit condenser heat recovery heat exchanger HEX1 is communicated with the water inlet end of the cooling TOWER TOWER, and the water outlet end of the cooling TOWER TOWER is communicated with the water inlet end of the working condition unit condenser water PUMP PUMP 4.
2. The system for testing the reverse temperature condition of a water chiller according to any one of claims 1, wherein: the water inlet pipeline of the test prototype evaporator EV is also provided with a chilled water flow meter F1 and a first temperature sensor T1, and the water outlet pipeline of the test prototype evaporator EV is also provided with a second temperature sensor T2; the water inlet pipeline of the test prototype condenser CO is also provided with a cooling water flowmeter F2 and a fourth temperature sensor T4, and the water outlet pipeline of the test prototype condenser CO is also provided with a third temperature sensor T3.
3. A condition unit control strategy applied to a cold water unit reverse temperature condition test system as claimed in claim 2, comprising the steps of:
s1, after a working condition unit receives a starting signal, a cluster control system performs fault detection on each device in the working condition unit, and after confirming that no fault exists, the cluster control system determines the on-off sequence of each compressor in the working condition unit as an on-duty compressor or manually designates one on-duty compressor according to a wheel value strategy;
round value strategy: the cluster control system records the running time of each compressor in the working condition unit from the first day of each month, designates the compressor with the shortest running time as the duty compressor, arranges the starting sequence of each unloaded running compressor in the working condition unit according to the sequence from the short running time to the long running time, and arranges the shutdown sequence of each loaded running compressor in the working condition unit according to the sequence from the long running time to the short running time;
s2, starting the compressor on duty, and running one of the following strategies by the working condition unit: the loading strategy of the current duty compressor, the loading strategy of the working condition unit and the reducing strategy of the working condition unit;
S3, working condition unit shutdown strategies: when the water flow of the working condition unit evaporator water PUMP PUMP3 and/or the working condition unit condenser water PUMP PUMP4 is cut off, or the water outlet of the water outlet pipeline of the current working condition unit evaporator WCEV is cut offThe actual temperature value Tpv is at the dead zone temperature T ref When the working condition unit is in the following state, the working condition unit is stopped;
the loading strategy of the compressor currently on duty in S2 further comprises the steps of:
the method comprises the steps of (1) presetting a water outlet temperature target value Tsp of a water outlet pipeline of a working condition unit evaporator WCEV, acquiring a water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV once per second by a cluster control system, recording the moment when the cluster control system starts to acquire the water outlet temperature actual value of the water outlet pipeline of the working condition unit evaporator WCEV as 0 th second, and calculating the water temperature change rate Vpv of the nth second according to the water outlet temperature actual value Tpv of the water outlet pipeline of the working condition unit evaporator WCEV acquired by the cluster control system:
tpv (i) represents the actual value of the outlet water temperature of the ith second, tpv (i+1) represents the actual value of the outlet water temperature of the (i+1) th second, wherein i is more than or equal to 0 and less than or equal to n, and i is an integer;
each compressor in the working condition unit adopts variable frequency control, each compressor corresponds to a set of PID regulating function, and Tpv is close to Tsp by continuously adjusting Tpv of the cluster control system:
If Tpv-Tsp is more than or equal to 10 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV to Vmax=1 ℃/min, judges whether Vpv is less than Vmax, allows the current duty compressor to load if Vpv is less than Vmax, and prohibits the current duty compressor from loading if Vpv is not less than Vmax;
if the temperature is more than or equal to 5 ℃ and less than Tpv-Tsp is less than 10 ℃, the cluster control system sets the maximum rate of change Vmax=0.5 ℃/min of the water outlet temperature of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether the Vpv is less than Vmax, allows the current duty compressor to load if the Vpv is less than Vmax, and prohibits the current duty compressor from loading if the Vpv is less than Vmax;
if Tpv-Tsp is less than 5 ℃, the cluster control system sets the maximum rate of change of the water outlet temperature Vmax=0.2 ℃/min of the water outlet pipeline of the working condition unit evaporator WCEV, judges whether Vpv is less than Vmax, allows the current duty compressor to load if Vpv is less than Vmax, and prohibits the current duty compressor from loading if Vpv is not less than Vmax.
The machine adding strategy of the working condition unit in the S2 further comprises the following steps:
Sb1, when the cluster control system detects that the running capacity of the running compressor in the working condition unit reaches more than 95% of the full-load running capacity within a first set time threshold delta t1, the cluster control system starts to calculate whether the working condition unit meets the machine adding condition;
sb2, the cluster control system calculates the target temperature difference delta T1 = Tpv-Tsp between the actual outlet water temperature value Tpv of the outlet water pipeline of the evaporator WCEV of the current working condition unit and the outlet water temperature target value Tsp, and returns to Sb1 if the current target temperature difference delta T1 is lower than the first set temperature difference value threshold;
if the current target temperature difference delta T1 is above the first set temperature difference threshold value, the cluster control system calculates a second change difference delta T2= | Tpv-Tpv '| between an actual outlet water temperature value Tpv of an outlet pipeline of the working condition unit evaporator WCEV at the moment and an actual outlet water temperature value Tpv' of the outlet pipeline of the working condition unit evaporator WCEV passing through a second set time threshold delta T2 from the moment, and if the second change difference delta T2 is above the second set temperature difference threshold value, returning to Sb1; if the second variation difference value delta T2 is lower than a second set temperature difference value threshold value, the working condition unit meets the machine adding condition;
and Sb3, increasing the loading operation of the compressor by the working condition unit according to a wheel strategy or a manually specified starting sequence.
The shutdown strategy of the working condition unit in the S2 further comprises the following steps:
sc1, the cluster control system detects that at least one compressor in the working condition unit is running, if the running capacity of the at least one compressor is maintained below 40% of the full-load running capacity within a third set time threshold delta t3, the cluster control system starts to calculate whether the working condition unit meets the condition of reducing the running speed;
sc2, the cluster control system judges whether the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator WCEV is below the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, and if the actual outlet water temperature value Tpv of the outlet water pipeline of the current working condition unit evaporator WCEV is higher than the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, the process returns to Sc1;
if the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV is below the outlet water temperature target value Tsp of the outlet water pipeline of the working condition unit evaporator WCEV, the cluster control system calculates the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV at the moment and a fourth variation difference value delta T4= | Tpv-Tpv | between the actual outlet water temperature Tpv of the outlet water pipeline of the working condition unit evaporator WCEV passing through a third set time threshold delta T3 from the moment, and if the fourth variation difference value delta T4 is above a fourth set temperature difference value threshold, the cluster control system returns to Sc1; if the fourth variation difference value delta T4 is lower than a fourth set temperature difference value threshold value, the working condition unit meets the condition of reducing the machine;
Sc3, the cluster control system reduces the non-duty compressors running in the working condition unit according to a wheel strategy or a manually specified shutdown sequence, and ensures that the running capacity of the duty compressors is controlled to be not lower than 40% of the full-load running capacity; the cluster control system turns off only one off-duty compressor at a time and returns to Sc1.
4. A condition unit control strategy according to claim 3, characterized in that: dead zone temperature T in S3 ref ＝Tsp-5℃。
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