CN109975057A - The quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing - Google Patents
The quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing, the following steps are included: the air injection enthalpy-increasing system to throttle before establishing flash vessel, setting engineer application are assumed, establish test bed testing freon system, obtain quasi- two-stage compression system real work circulation pressure-enthalpy chart, then thermodynamic analysis is carried out, pressure-enthalpy chart is recycled according to quasi- two-stage compression system real work and tests the temperature and pressure of each state point, calculate the state parameter of state point and the state parameter of each state point is updated to exothermal process；Test method of the invention is tested by the compressor suction of the quasi- two-stage compressed air source heat pump water heater system to Gas-supplying enthalpy-increasing, delivery temperature, the temperature of electric expansion valve throttling front and back and tonifying Qi temperature, the each state point of system pressure-enthalpy chart is obtained using experiment and by the way of calculating, the COP value of system can be found out, investment is effectively reduced cost, can solve the unstable problem of the test result of temperature change influence.
Description
Technical field
The present invention relates to water heater the field of test technology more particularly to the quasi- two-stage compressed air source heat-pump hot-waters of Gas-supplying enthalpy-increasing
Device experimental test procedures.
Background technique
When existing quasi- two-stage compression Gas-supplying enthalpy-increasing working substance system carries out quasi- two-stage compression defrosting, using paddy wheel compression machine,
The air inlet of paddy wheel compression machine uses 2 air inlets, tonifying Qi is carried out when outdoor temperature is low-down, to promote compressor
Efficiency, but in actual moving process, when outside air temperature is lower, compressor air-discharging is by using quasi- two-stage compression system
The circulatory system of heat pump is exhausted, and the high temperature and high pressure gas of compressor outlet is divided into two parts, and a part is passed through by condenser
Enter evaporator after expansion valve decompression, subsequently into compressor suction side, another part enters economizer after passing through condenser,
Then the auxiliary suction inlet tonifying Qi that steam enters compressor is distributed, on the one hand increases heat pump machine by improving evaporator degree of supercooling
Group absorbs the ability of heat in air, and the temperature for entering compressor working medium is on the other hand improved also by air compensating system, increases
The efficiency of system.
It is that can promote the efficiency of winter air source heat pump using Gas-supplying enthalpy-increasing technology, but the test mode of experimental study
It is different from, if you need to which the quasi- two-stage compression of Gas-supplying enthalpy-increasing is carried out deep thermodynamic study, also needs to obtain each shape of pressure-enthalpy chart
In general air injection enthalpy-increasing air source heat pump is such as carried out pressure test by state point, test program and the process is more complicated, very much
Mechanism for testing does not provide similar service, while in actual moving process, due to intake air temperature be variation, cause tonifying Qi temperature and
Pressure changes therewith, and the disorder that compressor air inlet can be caused to mix in this way, to the service life of compressor, there are larger problems, together
When, the price of paddy wheel compression machine is more many than the price of common compressor, and cost input is larger, and economy is low, therefore, the present invention
The quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing are proposed, to solve deficiency in the prior art
Place.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes that the quasi- two-stage compressed air source heat pump water heater of Gas-supplying enthalpy-increasing tests test side
Method passes through the compressor suction of the quasi- two-stage compressed air source heat pump water heater system to Gas-supplying enthalpy-increasing, delivery temperature, electronic expansion
The temperature and tonifying Qi temperature of valve throttling front and back are tested, and obtain each shape of system pressure-enthalpy chart using experiment and by the way of calculating
State point finally finds out the COP value of system, cost input can be effectively reduced and substantially reduce, good economy performance, can solve temperature change
Change the unstable problem of the test result influenced.
The present invention proposes the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing, including following step
It is rapid:
Step 1: establishing the air injection enthalpy-increasing system to throttle before flash vessel, controls and passes through from the liquid after condenser condensation
Enter flash vessel after the throttling of throttling set expansion valve, pressure value variation is unobvious in working medium mixed process, is set as isobaric procedure；
Step 2: setting engineer application is assumed, it is assumed that the pressure of the superheat section of evaporator outlet is constant, assumes condenser
Pressure is constant and assumes that in Gas-supplying enthalpy-increasing compression process be to determine entropic spueezing, and the entropy before and after tonifying Qi is constant；
Step 3: establishing test bed testing freon system, obtains quasi- two-stage compression system real work circulation pressure-enthalpy chart,
Then thermodynamic analysis is carried out, the temperature and pressure that pressure-enthalpy chart tests each state point are recycled according to quasi- two-stage compression system real work
Power arranges five temperature points according to test schematic, respectively the suction of test compression machine, row, tonifying Qi temperature and electronic expansion
Valve throttling front and back temperature, obtain temperature parameter t1, t3, t4, t5 ', t6, connect pressure gauge respectively in the high and low pressure side of system,
Environmental control system at the top of later on laboratory cools down to laboratory, and opens water pump and heat pump water-heating machine progress pressure survey
Examination, obtains pressure parameter P1、P2、P2’、P4’、P5、P5’, then the relationship of each state point of system is analyzed, is found out between system
Thermodynamic relation；
Step 4: 2 points of state, 2 ' point of state point, 3 points of state point, 4 points of state point, 4 ' point of state point are found out by calculating
With the state parameter of state point 5 ' point；
Step 5: the state parameter of each state point in step 3 and step 4 in cyclic process is updated to heat production
Journey obtains the heat production magnitude of circulation, further according to heating energy efficiency ratio is calculated.
Further improvement lies in that: pass through throttling set expansion valve section from the liquid after condenser condensation in the step 1
After entering flash vessel after stream, the refrigerant in flash vessel is divided into major loop part and auxiliary air compensating loop feature.
Further improvement lies in that: it is full under a certain middle pressure pressure that major loop part mass flow is m in the step 1
And liquid, it absorbs heat entering in evaporator after the throttling of throttling set expansion valve, finally enters compressor air suction mouth.
Further improvement lies in that: auxiliary air compensating loop feature mass flow is a certain middle pressure pressure of i in the step 1
Under saturated vapor, sucked after shut-off valve by compressor gas supplementing opening.
Further improvement lies in that: p-wire is conducting wire during test temperature in the step 3, and temperature test probe is
The bare metal silk of conducting wire, corresponding with measuring point by popping one's head in, probe is close to hot water machine copper pipe outer tube wall, with aluminium-foil paper and insulating tape
It is fixed, and isothermal holding is carried out with foamed material.
Further improvement lies in that: the treatment temperature that cools down in step 3 control reaches for laboratory's interior environment temperature to be set
20 DEG C of definite value.
Further improvement lies in that: in the step 4 shown in 2 points of state of compressive state calculation formula such as formula (1), shape
Shown in the compressive state and enthalpy calculation formula such as formula (2) of state point 2 ' point and (3), the compressive state that 3 points of state point calculates public
Shown in formula such as formula (4), shown in 4 points of state point of pressure parameter calculation formula such as formula (5), the enthalpy of state point 4 ' point is calculated
Shown in formula such as formula (6), shown in the enthalpy calculation formula such as formula (7) of state point 5 ' point:
S2=S1 (1)
S2’=S1 (2)
S3=S1 (4)
P4=P3 (5)
h4=h4’ (6)
h5=h5’ (7)
Wherein, when calculating the compressive state of state point 2 ' point, first assume that 2 ' o'clock to 3 points compression processes of state point are constant entropy
Compression, and assume S2=S1=S2’=S3。
Further improvement lies in that: shown in the heat production magnitude calculation formula recycled in the step 5 such as formula (8), acting
Process calculation formula such as formula (9) is described, finally obtains formula (10) according to formula (8) and formula (9)；
Q=(m+i) (h3-h4) (8)
W0=(m+i) (h3-h2')+m(h3-h2') (9)
Wherein, COP indicates heating energy efficiency ratio.
The invention has the benefit that passing through the pressure of the quasi- two-stage compressed air source heat pump water heater system to Gas-supplying enthalpy-increasing
The suction of contracting machine, delivery temperature, the temperature of electric expansion valve throttling front and back and tonifying Qi temperature are tested, using what is tested and calculate
Mode obtains each state point of system pressure-enthalpy chart, finally finds out the COP value of system, cost input can be effectively reduced and drop significantly
Low, good economy performance can solve the unstable problem of the test result of temperature change influence.
Detailed description of the invention
Fig. 1 is the quasi- two-stage compression measuring and calculation flow diagram of the method for the present invention Gas-supplying enthalpy-increasing.
Fig. 2 is quasi- two-stage compression Gas-supplying enthalpy-increasing working substance system structure chart in the method for the present invention.
Fig. 3 is quasi- two-stage compression system real work circulation pressure enthalpy schematic diagram in the method for the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
According to Fig. 1,2,3, the present embodiment proposes that the quasi- two-stage compressed air source heat pump water heater experiment of Gas-supplying enthalpy-increasing is surveyed
Method for testing, comprising the following steps:
Step 1: establishing the air injection enthalpy-increasing system to throttle before flash vessel, controls and passes through from the liquid after condenser condensation
Enter flash vessel after the throttling of throttling set expansion valve, from the liquid after condenser condensation after the throttling of throttling set expansion valve
Into after flash vessel, the refrigerant in flash vessel is divided into major loop part and auxiliary air compensating loop feature, major loop part matter
The saturated liquid under a certain middle pressure pressure that flow is m is measured, is absorbed heat entering in evaporator after the throttling of throttling set expansion valve,
Compressor air suction mouth is finally entered, auxiliary air compensating loop feature mass flow is the saturated vapor under a certain middle pressure pressure of i, warp
It is sucked after crossing shut-off valve by compressor gas supplementing opening, pressure value variation is unobvious in working medium mixed process, is set as isobaric procedure；
Step 2: setting engineer application is assumed, it is assumed that the pressure of the superheat section of evaporator outlet is constant, assumes condenser
Pressure is constant and assumes that in Gas-supplying enthalpy-increasing compression process be to determine entropic spueezing, and the entropy before and after tonifying Qi is constant；
Step 3: establishing test bed testing freon system, obtains quasi- two-stage compression system real work circulation pressure-enthalpy chart,
Then thermodynamic analysis is carried out, the temperature and pressure that pressure-enthalpy chart tests each state point are recycled according to quasi- two-stage compression system real work
Power arranges five temperature points according to test schematic, respectively the suction of test compression machine, row, tonifying Qi temperature and electronic expansion
Valve throttling front and back temperature, obtain temperature parameter t1, t3, t4, t5 ', t6, connect pressure gauge respectively in the high and low pressure side of system,
Environmental control system at the top of later on laboratory cools down to laboratory, and Control experiment chamber interior environment temperature reaches setting value
20 DEG C, and water pump and heat pump water-heating machine progress pressure test are opened, p-wire is conducting wire, and temperature test probe is the exposed of conducting wire
Wire, corresponding with measuring point by popping one's head in, probe is close to hot water machine copper pipe outer tube wall, is fixed, is used in combination with aluminium-foil paper and insulating tape
Foamed material carries out isothermal holding, obtains pressure parameter P1、P2、P2’、P4’、P5、P5’, then to the relationship of each state point of system into
Row analysis, finds out the thermodynamic relation between system；
Step 4: 2 points of state, 2 ' point of state point, 3 points of state point, 4 points of state point, 4 ' point of state point are found out by calculating
With the state parameter of state point 5 ' point, shown in 2 points of state of compressive state calculation formula such as formula (1), the pressure of state point 2 ' point
Shown in contracting state and enthalpy calculation formula such as formula (2) and (3), 3 points of state point compressive state calculation formula such as formula (4) institute
Show, shown in 4 points of state point of pressure parameter calculation formula such as formula (5), the enthalpy calculation formula such as formula (6) of state point 4 ' point
It is shown, shown in the enthalpy calculation formula such as formula (7) of state point 5 ' point:
S2=S1 (1)
S2’=S1 (2)
S3=S1 (4)
P4=P3 (5)
h4=h4’ (6)
h5=h5’ (7)
Wherein, when calculating the compressive state of state point 2 ' point, first assume that 2 ' o'clock to 3 points compression processes of state point are constant entropy
Compression, and assume S2=S1=S2’=S3；
Step 5: the state parameter of each state point in step 3 and step 4 in cyclic process is updated to heat production
Journey obtains the heat production magnitude of circulation, further according to heating energy efficiency ratio, the heat production magnitude calculation formula such as formula of circulation is calculated
(8) shown in, acting process calculation formula such as formula (9) is described, finally obtains formula (10) according to formula (8) and formula (9)；
Q=(m+i) (h3-h4) (8)
W0=(m+i) (h3-h2')+m(h3-h2') (9)
Wherein, COP indicates heating energy efficiency ratio.
According to above-mentioned steps, the system of the air source hot pump water heater of certain quasi- two-stage compression is tested, obtain with
Test result under lower five kinds of operating conditions:
One test condition of operating condition is as shown in table 1-1:
Table 1-1
| Environment dry-bulb temperature | Ambient wet bulb temperature | Inflow temperature | Leaving water temperature |
| 20℃ | 15℃ | 15℃ | 20℃ |
One test case of operating condition is as shown in table 1-2, and wherein last group of data are data when unit reaches stable state:
Table 1-2
Obtained quasi- two-stage compression Gas-supplying enthalpy-increasing test parameter table is as shown in table 1-3:
Table 1-3
Two test condition of operating condition is as shown in table 2-1:
Table 2-1
It during test, keeps environment wet and dry bulb temperature constant by control device, and changes and control inlet and outlet temperature,
It is 50 DEG C by inflow temperature control, leaving water temperature control is 55 DEG C, is often separated by and records one group of test data test feelings for a period of time
Condition obtains two test case of operating condition as shown in table 2-2:
Table 2-2
Obtained quasi- two-stage compression Gas-supplying enthalpy-increasing test parameter table is as shown in table 2-3:
Table 2-3
Three test condition of operating condition is as shown in table 3-1:
Table 3-1
Then by adjusting environment parameter control device, to gradually reduce laboratory's environment temperature, by dropping for a long time
Wen Hou, environment temperature are finally down to and maintain -10 DEG C, and need to separately change and control leaving water temperature is 50 DEG C, and inflow temperature is not
It is controlled, the adjusting of a water flow has also been carried out in test process, equally, be often separated by a period of time one group of test number of record
According to obtaining test case as shown in table 3-2:
Table 3-2
Four test condition of operating condition is as shown in table 4-1:
Table 4-1
2 DEG C are set by environment dry-bulb temperature when test, wet-bulb temperature is 1 DEG C, is often separated by a period of time one group of survey of record
Data are tried, test case is as shown in table 4-2:
Table 4-2
Occurs frosting on the hot water machine air cooling fin run in clammy environment, but frost layer is than relatively thin, wherein front wing
Piece is layering frosting, and frosting position appears in the top half of fin, the non-frosting in lower half portion；Back side fin is all tied substantially
Frost, unit enters defrost operating condition after frosting for a period of time, and the defrost time is very short, it is only necessary to 5 minutes or so time, machine after defrost
Group quickly reaches stable state, is successively defrosted twice in test, unit operation conditions is good in the whole process.
Five test condition of operating condition is as shown in Table 5-1:
Table 5-1
The testing experiment is carried out on the basis of previous testing experiment, and test process keeps environment wet and dry bulb temperature not
Become, changing and controlling leaving water temperature is 50 DEG C, and inflow temperature is without control, after the debugging of short time, the fortune of unit
Row situation reaches stable state, is often separated by a period of time one group of test data of record, test case is as shown in table 5-2:
Table 5-2
Pass through the compressor suction of the quasi- two-stage compressed air source heat pump water heater system to Gas-supplying enthalpy-increasing, delivery temperature, electricity
The temperature and tonifying Qi temperature of sub- expansion valve throttling front and back are tested, and obtain system pressure-enthalpy chart using experiment and by the way of calculating
Each state point finally finds out the COP value of system, cost input can be effectively reduced and substantially reduce, and good economy performance can solve
The unstable problem of the test result that temperature change influences.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (8)
1. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing, which comprises the following steps:
Step 1: establishing the air injection enthalpy-increasing system to throttle before flash vessel, controls from the liquid after condenser condensation by throttling
Enter flash vessel after the throttling of device expansion valve, pressure value variation is unobvious in working medium mixed process, is set as isobaric procedure；
Step 2: setting engineer application is assumed, it is assumed that the pressure of the superheat section of evaporator outlet is constant, assumes the pressure of condenser
It is to determine entropic spueezing, and the entropy before and after tonifying Qi is constant in constant and hypothesis Gas-supplying enthalpy-increasing compression process；
Step 3: establishing test bed testing freon system, obtains quasi- two-stage compression system real work circulation pressure-enthalpy chart, then
Thermodynamic analysis is carried out, the temperature and pressure that pressure-enthalpy chart tests each state point is recycled according to quasi- two-stage compression system real work,
Five temperature points are arranged according to test schematic, respectively the suction of test compression machine, row, tonifying Qi temperature and electric expansion valve section
Flow front and back temperature, obtain temperature parameter t1, t3, t4, t5 ', t6, connect pressure gauge respectively in the high and low pressure side of system, then
It opens the environmental control system at the top of laboratory to cool down to laboratory, and opens water pump and heat pump water-heating machine progress pressure test,
Obtain pressure parameter P1、P2、P2’、P4’、P5、P5’, then the relationship of each state point of system is analyzed, find out the heat between system
Mechanical relationship；
Step 4: 2 points of state, 2 ' point of state point, 3 points of state point, 4 points of state point, state point 4 ' point and shape are found out by calculating
The state parameter of state point 5 ' point；
Step 5: the state parameter of each state point in step 3 and step 4 in cyclic process is updated to exothermal process, is obtained
The heat production magnitude recycled out, further according to heating energy efficiency ratio is calculated.
2. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 1, special
Sign is: entering flash vessel after the throttling of throttling set expansion valve from the liquid after condenser condensation in the step 1
Afterwards, the refrigerant in flash vessel is divided into major loop part and auxiliary air compensating loop feature.
3. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 2, special
Sign is: major loop part mass flow is the saturated liquid under a certain middle pressure pressure of m in the step 1, is filled through throttling
It sets to enter in evaporator after expansion valve throttles and absorb heat, finally enter compressor air suction mouth.
4. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 2, special
Sign is: auxiliary air compensating loop feature mass flow is the saturated vapor under a certain middle pressure pressure of i in the step 1, is passed through
It is sucked after shut-off valve by compressor gas supplementing opening.
5. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 1, special
Sign is: p-wire is conducting wire during test temperature in the step 3, and temperature test probe is the bare metal silk of conducting wire,
It will pop one's head in corresponding with measuring point, probe is close to hot water machine copper pipe outer tube wall, is fixed with aluminium-foil paper and insulating tape, and use foamed material
Carry out isothermal holding.
6. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 1, special
Sign is: the treatment temperature that cools down in step 3 control is that laboratory's interior environment temperature reaches 20 DEG C of setting value.
7. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 1, special
Sign is: in the step 4 shown in 2 points of state of compressive state calculation formula such as formula (1), the compression shape of state point 2 ' point
Shown in state and enthalpy calculation formula such as formula (2) and (3), shown in 3 points of state point of compressive state calculation formula such as formula (4),
Shown in 4 points of state point of pressure parameter calculation formula such as formula (5), enthalpy calculation formula such as formula (6) institute of state point 4 ' point
Show, shown in the enthalpy calculation formula such as formula (7) of state point 5 ' point:
S2=S1 (1)
S2’=S1 (2)
S3=S1 (4)
P4=P3 (5)
h4=h4’ (6)
h5=h5’ (7)
Wherein, when calculating the compressive state of state point 2 ' point, first assume that 2 ' o'clock to 3 points compression processes of state point are constant entropy pressure
Contracting, and assume S2=S1=S2’=S3。
8. the quasi- two-stage compressed air source heat pump water heater experimental test procedures of Gas-supplying enthalpy-increasing according to claim 1, special
Sign is: shown in the heat production magnitude calculation formula recycled in the step 5 such as formula (8), acting process calculation formula is such as public
Formula (9) is described, finally obtains formula (10) according to formula (8) and formula (9)；
Q=(m+i) (h3-h4) (8)
W0=(m+i) (h3-h2')+m(h3-h2') (9)
Wherein, COP indicates heating energy efficiency ratio.
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| CN111059762A (en) * | 2019-11-08 | 2020-04-24 | 湖南工程学院 | Debugging method of air-supply enthalpy-increasing quasi-secondary compressed air source heat pump water heater |
| CN112984855A (en) * | 2021-03-31 | 2021-06-18 | 广东积微科技有限公司 | Heat pump air conditioning system and control logic |
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