CN110186225B - System for improving supercooling degree of fluorine pump inlet and control method thereof - Google Patents
System for improving supercooling degree of fluorine pump inlet and control method thereof Download PDFInfo
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- CN110186225B CN110186225B CN201910535612.3A CN201910535612A CN110186225B CN 110186225 B CN110186225 B CN 110186225B CN 201910535612 A CN201910535612 A CN 201910535612A CN 110186225 B CN110186225 B CN 110186225B
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- cold source
- natural cold
- refrigerant
- supercooling degree
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- 238000004781 supercooling Methods 0.000 title claims abstract description 71
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 33
- 239000011737 fluorine Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title abstract description 9
- 239000003507 refrigerant Substances 0.000 claims abstract description 96
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims description 44
- 238000001816 cooling Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
Abstract
The invention discloses a system for improving the supercooling degree of an inlet of a fluorine pump and a control method, wherein the system comprises a refrigerant pump, a liquid storage device, a natural cold source condenser, a natural cold source supercooler, a first natural cold source adjusting device, a second natural cold source adjusting device, an evaporator, a natural cold source input pipe and a natural cold source output pipe; according to the system, the natural cold source subcooler and the second natural cold source adjusting device are arranged, and the degree of supercooling of the inlet of the refrigerant pump can be controlled by adjusting the opening of the second natural cold source adjusting device, so that the probability of cavitation fault of the refrigerant pump is reduced, the operation efficiency and the service life of the refrigerant pump are improved, and the energy-saving refrigeration effect of the fluorine pump air conditioner is guaranteed.
Description
Technical Field
The invention belongs to the technical field of air conditioners, in particular to a system and a control method for the supercooling degree of a fluorine pump inlet used for a fluorine pump air conditioner.
Background
In the current advocate green energy saving in the data computer lab, in order to reduce air conditioning system's energy consumption, the fluorine pump energy saving technology that utilizes natural cold source is the novel technology that emerges in recent years. At the heart of the energy saving technology of the fluorine pump is a refrigerant loop by means of the power circulation of the pump, because the electric power of the fluorine pump is often much smaller than the electric power of the fluorine pump, and therefore the fluorine pump system has higher energy efficiency. Stable operation of the fluorine pump is critical, wherein cavitation of the fluorine pump is the greatest contributor to system failure. In the prior art, a liquid storage device with a certain volume is arranged at the inlet end of a pump to ensure that sufficient liquid refrigerant enters the fluorine pump, and in order to ensure effective cavitation allowance at the liquid inlet end, the liquid storage device is often required to be arranged to be higher than the fluorine pump by a certain height. However, in the practical use of the fluorine pump, between the outlet of the liquid storage device and the inlet of the fluorine pump, the heat preservation of the pipeline at the inlet of the fluorine pump is good, and the resistance loss of the pipeline can cause gasification of the refrigerant to a certain extent, so that the safe operation and the service life of the fluorine pump are affected.
Therefore, a new solution is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to: the invention provides a system for improving the supercooling degree of a fluorine pump inlet and a control method thereof, which can reduce the probability of cavitation failure of the fluorine pump, improve the safe operation of the fluorine pump system and prolong the service life of a refrigerant pump.
The technical scheme is as follows: the system for improving the supercooling degree of the inlet of the fluorine pump can adopt the following technical scheme:
A system for improving the supercooling degree of an inlet of a fluorine pump comprises a refrigerant pump, a liquid storage device, a natural cold source condenser, a natural cold source supercooler, a first natural cold source adjusting device, a second natural cold source adjusting device, an evaporator, a natural cold source input pipe and a natural cold source output pipe; the outlet of the refrigerant pump is connected with the inlet of the evaporator; the outlet of the evaporator is connected with the refrigerant inlet of the natural cold source condenser; the refrigerant outlet of the natural cold source condenser is connected with the inlet of the liquid storage device; the outlet of the liquid reservoir is connected with the refrigerant inlet of the natural cold source subcooler; the refrigerant outlet of the natural cold source subcooler is connected with the refrigerant pump inlet; a natural cold source inlet of the natural cold source condenser is connected with a natural cold source input pipe; the natural cold source outlet of the natural cold source condenser is connected with a natural cold source output pipe, and the output opening degree is regulated by a first natural cold source regulating device; the natural cold source inlet of the natural cold source subcooler is connected with a natural cold source input pipe; the natural cold source outlet of the natural cold source subcooler is connected with the natural cold source output pipe, and the output opening degree is regulated by the second natural cold source regulating device.
The system for improving the supercooling degree of the inlet of the fluorine pump can adopt the following control method:
The method comprises the following steps:
(1) Controlling the opening degree of the first natural cold source regulating device according to the outlet temperature of the refrigerant and the set value of the temperature of the refrigerant; enabling the refrigerant to enter an air conditioner evaporator of the machine room at a preset temperature;
(2) Controlling the opening of the second natural cold source regulating device according to the supercooling degree of the refrigerant and the supercooling degree set value of the refrigerant; wherein the refrigerant pressure P0 at the input end of the refrigerant pump is detected, and the refrigerant saturation temperature T0 is determined according to the pressure; detecting the temperature T1 of the refrigerant at the input end of the refrigerant pump, and determining the actual supercooling degree Ta=T0-T1; setting a supercooling degree set value Ts; setting a supercooling degree dead zone a; setting a supercooling degree proportion zone b; if the actual supercooling degree Ta is between [ Ts-a, ts+a ], the second natural cold source regulating device is closed;
(3) When the actual supercooling degree Ta is smaller than Ts-a, starting a second natural cold source regulating device, wherein the opening of the second natural cold source regulating device is started according to the requirement, namely, the TS-a-Ta/b, and the opening is started according to the percentage; until the actual supercooling degree Ta falls within the supercooling degree static region;
(4) When the detected actual supercooling degree Ta is more than Ts+a, reducing the opening degree of the second natural cold source regulating device and enabling the temperature of the refrigerant outlet to meet the set value range at the same time, wherein the actual supercooling degree Ta is more than Ts+a, so that energy is saved;
(5) If the second natural cold source regulating device reaches the maximum value, the current supercooling degree of the refrigerant is still lower than the set supercooling degree, and the maximum state of the second natural cold source regulating device is maintained; ta is smaller than Ts-a, and the opening degree of the natural cold source regulating device 2-6 is kept;
(6) If the second natural cold source regulating device is in the maximum opening state, the operation frequency of the refrigerant pump is reduced until the supercooling degree reaches a set value;
(7) If the refrigerant pump has been operated to the minimum frequency state, the second natural cooling source adjusting device is in the maximum opening state, and the supercooling degree still cannot reach the set supercooling degree, the operation of the refrigerant pump is stopped.
The beneficial effects are that: compared with the prior art, the invention can control the supercooling degree of the inlet of the refrigerant pump by arranging the natural cold source supercooler and the second natural cold source regulating device and regulating the opening of the second natural cold source regulating device, thereby reducing the probability of cavitation fault of the refrigerant pump, improving the operation efficiency and the service life of the refrigerant pump and guaranteeing the energy-saving refrigeration effect of the fluorine pump air conditioner; meanwhile, the volume of the liquid storage device in front of the refrigerant pump in the prior art can be reduced, and the filling amount of the refrigerant is reduced.
Drawings
FIG. 1 is a schematic diagram of a system for increasing the supercooling degree of an inlet of a fluorine pump according to the present invention.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1, the invention discloses a system for improving the supercooling degree of a fluorine pump inlet, which comprises a refrigerant pump 1, a liquid storage device 2, a natural cold source condenser 3, a natural cold source supercooler 4, a first natural cold source adjusting device 5, a second natural cold source adjusting device 6, an evaporator 7, a natural cold source input pipe 8 and a natural cold source output pipe 9.
The outlet of the refrigerant pump 1 is connected with the inlet of the evaporator 7; the outlet of the evaporator 7 is connected with the refrigerant inlet 10 of the natural cold source condenser 3. The refrigerant outlet 11 of the natural cold source condenser 3 is connected with the inlet of the liquid reservoir 2. The outlet of the liquid reservoir 2 is connected with the refrigerant inlet 14 of the natural cold source subcooler 4. The refrigerant outlet 15 of the natural cooling source subcooler 4 is connected to the refrigerant pump 1 inlet.
The natural cold source inlet 12 of the natural cold source condenser 3 is connected with the natural cold source input pipe 8. The natural cold source outlet 13 of the natural cold source condenser 3 is connected with the natural cold source output pipe 9, and the output opening degree is regulated by the first natural cold source regulating device 5. The natural cold source inlet 16 of the natural cold source subcooler 4 is connected with the natural cold source input pipe 8. The natural cold source outlet 17 of the natural cold source subcooler 4 is connected with the natural cold source output pipe 9. And the output opening degree is regulated by the second natural cold source regulating device 6. In the system, a natural cold source subcooler 4, a natural cold source input pipe 8 and a natural cold source output pipe 9 form a subcooling degree adjusting cycle. The natural cold source condenser 3, the natural cold source input pipe 8 and the natural cold source output pipe 9 form a refrigerant condensation cycle. The supercooling degree adjusting cycle is connected in parallel with the refrigerant condensing cycle. In this embodiment, the natural cooling medium input into the natural cooling medium input pipe is preferably a natural cooling medium including a low-temperature air source or low-temperature lake water. The refrigerant medium in the refrigerant pump and the liquid reservoir is Freon medium comprising R134a or R22 or R410A.
The first natural cold source adjusting device 5 and the second natural cold source adjusting device 6 can be selected as electric adjusting water valves or electric adjusting air valves or fan rotating speed adjusting devices according to different cold source sources.
In the system, the natural cold source subcooler 4 and the second natural cold source regulating device 6 are arranged, and the degree of supercooling of the inlet of the refrigerant pump 1 can be controlled by regulating the opening of the second natural cold source regulating device 6, so that the probability of cavitation fault of the refrigerant pump 1 is reduced, the operation efficiency and the service life of the refrigerant pump 1 are improved, and the energy-saving refrigeration effect of the fluorine pump air conditioner is ensured; meanwhile, the volume of the liquid reservoir 2 in front of the refrigerant pump in the prior art can be reduced, and the filling amount of the refrigerant can be reduced.
The invention also provides a control method of the system, which comprises the following steps:
(1) Controlling the opening degree of the first natural cold source regulating device 5 according to the outlet temperature of the refrigerant and the set value of the temperature of the refrigerant; the refrigerant enters the air conditioner evaporator of the machine room at a preset temperature.
(2) Controlling the opening degree of the second natural cold source regulating device 6 according to the supercooling degree of the refrigerant and the supercooling degree set value of the refrigerant; wherein the refrigerant pressure P0 at the input end of the refrigerant pump 1 is detected, and the refrigerant saturation temperature T0 is determined according to the pressure; detecting the temperature T1 of the refrigerant at the input end of the refrigerant pump 1, and determining the actual supercooling degree Ta=T0-T1; setting a supercooling degree set value Ts; setting a supercooling degree dead zone a; setting a supercooling degree proportion zone b; if the actual supercooling degree Ta is between [ Ts-a, ts+a ], the second natural cold source regulating device is closed.
(3) When the actual supercooling degree Ta is smaller than Ts-a, the second natural cold source regulating device 6 is started, and the opening of the second natural cold source regulating device 6 is started according to the requirement, namely, the TS-a-Ta/b, and the percentage is calculated; until the actual supercooling degree Ta falls within the supercooling degree dead zone.
(4) When the actual supercooling degree Ta > Ts+a is detected, the opening degree of the second natural cooling source adjusting device 6 is reduced and the refrigerant outlet temperature of the refrigerant pump is made to satisfy the set value range for energy saving.
(5) If the second natural cold source adjusting device 6 has reached the maximum value, and the current supercooling degree of the refrigerant is still lower than the set supercooling degree, maintaining the maximum state of the second natural cold source adjusting device 6; namely Ta is smaller than Ts-a, and the opening degree of the natural cold source regulating device 2-6 is kept.
(6) If the second natural cooling source adjusting device 6 is already in the maximum opening state, the operating frequency of the refrigerant pump 1 is reduced until the supercooling degree reaches the set value.
(7) If the refrigerant pump 1 has been operated to the minimum frequency state and the second natural cooling source adjusting device 6 has been in the maximum opening state, the supercooling degree still cannot reach the set supercooling degree, the operation of the refrigerant pump 1 is stopped to prevent the refrigerant pump 1 from being damaged due to cavitation of the refrigerant.
By the above control method, the opening degree of the second natural cooling source adjusting device can be automatically adjusted by the detected actual supercooling degree to realize automatic control of the supercooling degree of the inlet of the refrigerant pump 1. Thereby further optimizing the real-time control capability of the system.
In addition, the invention may be embodied in many specific forms and should not be construed as limited to the embodiments set forth herein. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (4)
1. The system for improving the supercooling degree of the inlet of the fluorine pump is characterized by comprising a refrigerant pump, a liquid storage device, a natural cold source condenser, a natural cold source supercooler, a first natural cold source adjusting device, a second natural cold source adjusting device, an evaporator, a natural cold source input pipe and a natural cold source output pipe;
The outlet of the refrigerant pump is connected with the inlet of the evaporator; the outlet of the evaporator is connected with the refrigerant inlet of the natural cold source condenser; the refrigerant outlet of the natural cold source condenser is connected with the inlet of the liquid storage device; the outlet of the liquid reservoir is connected with the refrigerant inlet of the natural cold source subcooler; the refrigerant outlet of the natural cold source subcooler is connected with the refrigerant pump inlet;
The natural cold source subcooler, the natural cold source input pipe and the natural cold source output pipe form a supercooling degree adjusting cycle; the natural cold source condenser, the natural cold source input pipe and the natural cold source output pipe form refrigerant condensation circulation; the supercooling degree adjusting cycle is connected with the refrigerant condensing cycle in parallel;
A natural cold source inlet of the natural cold source condenser is connected with a natural cold source input pipe; the natural cold source outlet of the natural cold source condenser is connected with a natural cold source output pipe, and the output opening degree is regulated by a first natural cold source regulating device; the adjusting mode is as follows: controlling the opening degree of the first natural cold source regulating device according to the outlet temperature of the refrigerant and the set value of the temperature of the refrigerant; enabling the refrigerant to enter an air conditioner evaporator of the machine room at a preset temperature;
the natural cold source inlet of the natural cold source subcooler is connected with a natural cold source input pipe; the natural cold source outlet of the natural cold source subcooler is connected with a natural cold source output pipe, and the output opening degree is regulated by a second natural cold source regulating device; the adjusting mode is as follows:
Controlling the opening degree of the second natural cold source regulating device according to the supercooling degree of the refrigerant and the supercooling degree set value of the refrigerant; wherein the refrigerant pressure P0 at the input end of the refrigerant pump is detected, and the refrigerant saturation temperature T0 is determined according to the pressure; detecting the temperature T1 of the refrigerant at the input end of the refrigerant pump, and determining the actual supercooling degree Ta=T0-T1; setting a supercooling degree set value Ts; setting a supercooling degree static region a and a supercooling degree proportion zone b; if the actual supercooling degree Ta is between [ Ts-a, ts+a ], the second natural cold source regulating device is closed;
When the actual supercooling degree Ta is smaller than Ts-a, starting a second natural cold source regulating device, wherein the opening of the second natural cold source regulating device is started according to the requirement, namely, the TS-a-Ta/b, and the opening is started according to the percentage; until the actual supercooling degree Ta falls within the supercooling degree static region;
when the detected actual supercooling degree Ta is more than Ts+a, reducing the opening degree of the second natural cold source regulating device and enabling the outlet temperature of the refrigerant to meet the set value range at the same time for saving energy;
If the second natural cold source regulating device reaches the maximum value, the current supercooling degree of the refrigerant is still lower than the set supercooling degree, and the maximum state of the second natural cold source regulating device is maintained; ta is smaller than Ts-a, and the opening degree of the natural cold source regulating device 2-6 is kept;
If the second natural cold source regulating device is in the maximum opening state, the operation frequency of the refrigerant pump is reduced until the supercooling degree reaches a set value;
If the refrigerant pump has been operated to the minimum frequency state and the second natural cooling source adjusting device has been in the maximum opening state, the supercooling degree still cannot reach the set supercooling degree, and the operation of the refrigerant pump is stopped.
2. The system for increasing the supercooling degree of an inlet of a fluorine pump according to claim 1, wherein: the natural cold source medium input in the natural cold source input pipe is a natural cold source comprising a low-temperature air source or low-temperature lake water.
3. The system for increasing the supercooling degree of an inlet of a fluorine pump according to claim 1 or 2, wherein: the refrigerant medium in the refrigerant pump and the liquid reservoir is Freon medium comprising R134a or R22 or R410A.
4. The system for increasing the supercooling degree of an inlet of a fluorine pump according to claim 1 or 2, wherein: the first natural cold source adjusting device and the second natural cold source adjusting device are electric adjusting water valves or electric adjusting air valves or fan rotating speed adjusting devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535612.3A CN110186225B (en) | 2019-06-20 | System for improving supercooling degree of fluorine pump inlet and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910535612.3A CN110186225B (en) | 2019-06-20 | System for improving supercooling degree of fluorine pump inlet and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110186225A CN110186225A (en) | 2019-08-30 |
| CN110186225B true CN110186225B (en) | 2024-06-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210267822U (en) * | 2019-06-20 | 2020-04-07 | 南京佳力图机房环境技术股份有限公司 | System for improving degree of supercooling of fluorine pump inlet |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210267822U (en) * | 2019-06-20 | 2020-04-07 | 南京佳力图机房环境技术股份有限公司 | System for improving degree of supercooling of fluorine pump inlet |
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