CN111692774A - Heat pump system with enhanced vapor injection and control method thereof - Google Patents
Heat pump system with enhanced vapor injection and control method thereof Download PDFInfo
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- CN111692774A CN111692774A CN202010602721.5A CN202010602721A CN111692774A CN 111692774 A CN111692774 A CN 111692774A CN 202010602721 A CN202010602721 A CN 202010602721A CN 111692774 A CN111692774 A CN 111692774A
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- vapor injection
- enhanced vapor
- opening degree
- expansion valve
- electronic expansion
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a heat pump system with enhanced vapor injection, which comprises an enhanced vapor injection compressor, a four-way valve, a hydraulic heat exchanger, a flash evaporator and an outdoor heat exchanger, wherein four interfaces of the four-way valve are respectively connected with the output end of the enhanced vapor injection compressor, the air return end of the enhanced vapor injection compressor, one end of the hydraulic heat exchanger and one end of the outdoor heat exchanger, a first pipe orifice of the flash evaporator is connected with the other end of the outdoor heat exchanger, a second pipe orifice of the flash evaporator is connected with the other end of the hydraulic heat exchanger through an electronic expansion valve, and a gas-liquid ejection port of the flash evaporator is connected with the air return end of the enhanced vapor injection compressor; the hydraulic heat exchanger is respectively connected with the water using side through a water outlet pipe and a water return pipe; the temperature monitoring device also comprises an outlet water temperature detection unit for monitoring the outlet water temperature of the outlet pipe and an outdoor environment temperature detection unit for monitoring the outdoor environment temperature.
Description
Technical Field
The invention relates to the technical field of heat pump systems, in particular to a heat pump system with enhanced vapor injection and a control method thereof.
Background
The following problems exist in the existing heat pump system: 1) in the enhanced vapor injection technology, the flash evaporator has requirements on the throttling degree of a throttling part, and the risk of liquid carrying of the injected gas is reduced by high dryness; 2) when the water temperature is high, if the throttling degree of the throttling component is too large, the pressure and the exhaust gas are easily overhigh; 3) when the water temperature is low, if the throttling degree of the throttling component is too small, the risk of liquid carrying of the air injection is easily increased.
On the heat pump without the enhanced vapor injection technology, the electronic expansion valve can be controlled by two temperature parameters of exhaust temperature and ambient temperature, and the opening degree of the electronic expansion valve can not have great influence on the reliability of the compressor even if the opening degree of the electronic expansion valve is changed in a larger range. However, in the heat pump with enhanced vapor injection technology, the opening degree of the electronic expansion valve needs to be changed in a relatively small range, so that the dryness of the refrigerant after primary throttling is ensured to be relatively large, and the refrigerant returning through the gas injection port does not have liquid refrigerant. Therefore, the method of adding frequency correction and fixed correction coefficient to make the opening of the electronic expansion valve change only in a small amplitude in a specific interval is widely applied at present, and the dryness of the primary throttling refrigerant is ensured. In fact, in the case of high water temperature and small frequency variation of the compressor, too small opening degree of the electronic expansion valve may cause the phenomena of excessive high exhaust gas and pressure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a heat pump system with enhanced vapor injection and a control method thereof.
In order to achieve the purpose, the heat pump system with enhanced vapor injection provided by the invention comprises an enhanced vapor injection compressor, a four-way valve, a hydraulic heat exchanger, a flash evaporator and an outdoor heat exchanger, wherein four interfaces of the four-way valve are respectively connected with the output end of the enhanced vapor injection compressor, the air return end of the enhanced vapor injection compressor, one end of the hydraulic heat exchanger and one end of the outdoor heat exchanger, a first pipe orifice of the flash evaporator is connected with the other end of the outdoor heat exchanger, a second pipe orifice of the flash evaporator is connected with the other end of the hydraulic heat exchanger through an electronic expansion valve, and a gas-liquid ejection port of the flash evaporator is connected with the air return end of the enhanced vapor injection compressor; the hydraulic heat exchanger is respectively connected with the water using side through a water outlet pipe and a water return pipe; the temperature monitoring device also comprises an outlet water temperature detection unit for monitoring the outlet water temperature of the outlet pipe and an outdoor environment temperature detection unit for monitoring the outdoor environment temperature.
And the throttling unit is arranged between the outdoor heat exchanger and the first pipe orifice of the flash evaporator, wherein two ends of the throttling unit are respectively connected with the outdoor heat exchanger and the first pipe orifice of the flash evaporator.
And the gas-liquid separator is arranged between the four-way valve and the enhanced vapor injection compressor, wherein two ends of the gas-liquid separator are respectively connected with the four-way valve and the enhanced vapor injection compressor.
Further, still include and establish at the output of enhanced vapor injection compressor and be used for detecting the exhaust temperature detecting element who obtains exhaust temperature Tp.
A control method of a heat pump system with enhanced vapor injection comprises the following steps:
s1, detecting and acquiring the operation frequency F1, the effluent temperature T1, the environment temperature T4 and the actual opening P1 of an electronic expansion valve in real time when the heat pump system operates at the time T1;
s2, selecting corresponding correction coefficients a, b and c based on the current environment temperature T4, and calculating and confirming a target opening P0 of the electronic expansion valve by combining the operation frequency F0 and the outlet water temperature T1;
s3, comparing the actual opening P1 with the target opening P0, and correspondingly adjusting the electronic expansion valve to the target opening P0;
s4, when the heat pump system continues to run for a time T3 after the previous adjusting action, detecting and acquiring the current compressor frequency F1, the outlet water temperature T1, the ambient temperature T4 and the actual opening P1 of the electronic expansion valve, and repeating the step S2 and the step S3 to correspondingly adjust the opening of the electronic expansion valve.
Further, in step S2, a target opening degree P0 of the confirmation electronic expansion valve is calculated based on the calculation formula P0= a × F1+ B × T1+ c.
Further, when the calculated and confirmed target opening degree P0 is lower than the minimum opening degree value of the electronic expansion valve, the minimum opening degree value is set as the target opening degree P0.
Further, when the actual opening degree P1 is greater than the target opening degree P0, the electronic expansion valve is controlled to gradually decrease the opening degree at a preset adjustment rate until the target opening degree P0 is reached; on the contrary, when the actual opening degree P1 is smaller than the target opening degree P0, the electronic expansion valve is controlled to gradually increase the opening degree at a predetermined adjustment rate until the target opening degree P0 is reached.
Further, when the difference between the actual opening degree P1 and the target opening degree P0 is smaller than the opening degree value of the single adjustment of the predetermined adjustment rate, the electronic expansion valve is adjusted directly to the target opening degree P0.
Further, during monitoring and adjusting the opening of the electronic expansion valve, the discharge temperature Tp of the enhanced vapor injection compressor is monitored in real time, wherein when the discharge temperature Tp exceeds a predetermined limit temperature Tpmax, the predetermined adjustment rate of the electronic expansion valve is increased.
The invention adopts the scheme, and has the beneficial effects that: the opening degree of the electronic expansion valve is adjusted more reasonably, the failure probability of the unit is reduced, the reliability of the unit is improved, and the service life of the unit is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioning system according to the present invention.
The system comprises a 1-enhanced vapor injection compressor, an 11-exhaust temperature detection unit, a 2-four-way valve, a 3-hydraulic heat exchanger, a 31-effluent temperature detection unit, a 4-flash evaporator, a 5-outdoor heat exchanger, a 51-outdoor environment temperature detection unit, a 6-electronic expansion valve, a 7-throttling unit and an 8-gas-liquid separator.
Detailed Description
To facilitate an understanding of the invention, the invention is described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, in this embodiment, a heat pump system with enhanced vapor injection includes an enhanced vapor injection compressor 1, a four-way valve 2, a hydraulic heat exchanger 3, a flash evaporator 4, an outdoor heat exchanger 5, a throttling unit 7, and a gas-liquid separator 8, where four interfaces of the four-way valve 2 are respectively connected to an output end of the enhanced vapor injection compressor 1, a gas return end of the enhanced vapor injection compressor 1, one end of the hydraulic heat exchanger 3, and one end of the outdoor heat exchanger 5. A first pipe orifice of the flash evaporator 4 is connected with the other end of the outdoor heat exchanger 5, a second pipe orifice of the flash evaporator 4 is connected with the other end of the hydraulic heat exchanger 3 through an electronic expansion valve 6, and a gas-liquid ejection port of the flash evaporator 4 is connected with a gas return end of the enhanced vapor injection compressor 1; the hydraulic heat exchanger 3 is respectively connected with the water using side through a water outlet pipe and a water return pipe. The throttling unit 7 is arranged between the outdoor heat exchanger 5 and the first pipe orifice of the flash evaporator 4, wherein two ends of the throttling unit 7 are respectively connected with the first pipe orifices of the outdoor heat exchanger 5 and the flash evaporator 4. The gas-liquid separator 8 is arranged between the four-way valve 2 and the enhanced vapor injection compressor 1, wherein two ends of the gas-liquid separator 8 are respectively connected with the four-way valve 2 and the enhanced vapor injection compressor 1.
In this embodiment, the present invention further includes an outlet water temperature detecting unit 31, an outdoor environment temperature detecting unit 51, and an exhaust temperature detecting unit 11, where the outlet water temperature detecting unit 31 of this embodiment is disposed on the outlet pipe and is used to detect an outlet water temperature T1 of the outlet pipe; the outdoor environment temperature detection unit 51 of the present embodiment is provided at the outdoor heat exchanger 5 and is configured to detect and acquire an outdoor environment temperature T4; the exhaust gas temperature detection unit 11 is provided at the output end of the enhanced vapor injection compressor 1 and is used for detecting and acquiring the exhaust gas temperature Tp.
In this embodiment, the high-temperature and high-pressure refrigerant compressed by the enhanced vapor injection compressor 1 flows into the hydraulic heat exchanger 3 through the four-way valve 2 to be condensed and released heat (to be condensed into a high-pressure liquid refrigerant), the released refrigerant is throttled by the electronic expansion valve 6 (medium-pressure gas-liquid two-phase refrigerant) and enters the flash evaporator 4 to be subjected to gas-liquid separation, the medium-pressure gas refrigerant directly returns to the enhanced vapor injection compressor 1 along the pipeline, the separated medium-pressure liquid refrigerant is subjected to secondary throttling by the throttling unit 7 to be converted into a low-pressure gas-liquid two-phase refrigerant, and flows into the outdoor heat exchanger 5 to be evaporated and absorbed, and finally flows back to the enhanced vapor injection compressor.
For convenience of understanding, the control method of the heat pump system with enhanced vapor injection of the embodiment includes the following steps:
s1, detecting and acquiring the operation frequency F1, the outlet water temperature T1, the environment temperature T4 and the actual opening P1 of the electronic expansion valve 6 of the enhanced vapor injection compressor 1 in real time when the operation time T1 of the heat pump system is up.
S2, selecting corresponding correction coefficients a, b and c based on the current environment temperature T4, and calculating and confirming a target opening P0 of the electronic expansion valve 6 by combining the operation frequency F0 and the outlet water temperature T1;
further, in step S2, the correction coefficients a, b, and c are determined by the ambient temperature T4, and each ambient temperature T4 is preset to correspond to one of the correction coefficients a, b, and c, and is determined according to the product specification, the operating condition, and other parameters, and can be preset by those skilled in the art as needed. A
Further, a target opening degree P0 of the electronic expansion valve 6 is calculated and confirmed based on the calculation formula P0= a × F0+ B × T1+ c, where P0 is the target opening degree of the electronic expansion valve 6 and is a unit of steps; f0 is the running frequency of the enhanced vapor injection compressor 1 and the unit is Hz; t1 is the outlet water temperature of the outlet pipe, unit degree.
Further, when the calculated and confirmed target opening degree P0 is lower than the minimum opening degree value of the electronic expansion valve 6, the minimum opening degree value is set as the target opening degree P0.
S3, comparing the actual opening P1 with the target opening P0, and correspondingly adjusting the electronic expansion valve 6 to the target opening P0, wherein when the actual opening P1 is larger than the target opening P0 (P1 is larger than P0), the electronic expansion valve 6 is controlled to gradually reduce the opening at a preset adjustment rate until the target opening P0 is reached; on the contrary, when the actual opening degree P1 is smaller than the target opening degree P0 (P1 < P0), the electronic expansion valve 6 is controlled to gradually increase the opening degree at a predetermined adjustment rate until the target opening degree P0 is reached.
Further, the predetermined adjustment rate is a preset n steps/unit time t.
Further, when the difference between the actual opening degree P1 and the target opening degree P0 is smaller than the opening degree value of a single adjustment of the predetermined adjustment rate (i.e., P1-P0 or P0-P1 < n steps), the electronic expansion valve 6 is adjusted directly to the target opening degree P0.
S4, when the heat pump system continues to run for a time T3 after the previous adjusting action, detecting and acquiring the current compressor frequency F1, the outlet water temperature T1, the ambient temperature T4 and the actual opening P1 of the electronic expansion valve 6, repeating the steps S2 and S3 to correspondingly adjust the opening of the electronic expansion valve 6 again, and circularly repeating the steps until the actual opening P1 is equal to the target opening P0.
In the present embodiment, during the monitoring and adjusting of the opening degree of the electronic expansion valve 6, the exhaust temperature Tp of the enhanced vapor injection compressor 1 is monitored in real time, wherein when the exhaust temperature Tp exceeds the predetermined limit temperature Tpmax, the predetermined adjustment rate of the electronic expansion valve 6 is decreased, i.e., n/unit time t in the predetermined adjustment rate of the electronic expansion valve 6 is increased to m/unit time t (m > n), so as to speed up the adjustment rate and avoid the problem of excessive exhaust temperature.
The opening degree of the electronic expansion valve 6 is more reasonably adjusted by the heat pump system and the control method thereof, so that the failure probability of the unit is reduced, the reliability of the unit is improved, and the service life of the unit is prolonged.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent changes made according to the spirit of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. The utility model provides a take heat pump system of enhanced vapor injection which characterized in that: the device comprises an enhanced vapor injection compressor (1), a four-way valve (2), a hydraulic heat exchanger (3), a flash evaporator (4), an outdoor heat exchanger (5) and an electronic expansion valve (6), wherein four interfaces of the four-way valve (2) are respectively connected with the output end of the enhanced vapor injection compressor (1), the air return end of the enhanced vapor injection compressor (1), one end of the hydraulic heat exchanger (3) and one end of the outdoor heat exchanger (5), a first pipe orifice of the flash evaporator (4) is connected with the other end of the outdoor heat exchanger (5), a second pipe orifice of the flash evaporator (4) is connected with the other end of the hydraulic heat exchanger (3) through the electronic expansion valve (6), and a gas-liquid spray outlet of the flash evaporator (4) is connected with the air return end of the enhanced vapor injection compressor (1); the hydraulic heat exchanger (3) is respectively connected with the water using side through a water outlet pipe and a water return pipe; the temperature control device also comprises an outlet water temperature detection unit (31) used for monitoring the outlet water temperature of the outlet pipe and an outdoor environment temperature detection unit (51) used for monitoring the outdoor environment temperature.
2. The heat pump system with enhanced vapor injection according to claim 1, wherein: the device also comprises a throttling unit (7) arranged between the outdoor heat exchanger (5) and the first pipe orifice of the flash evaporator (4), wherein two ends of the throttling unit (7) are respectively connected with the first pipe orifice of the outdoor heat exchanger (5) and the first pipe orifice of the flash evaporator (4).
3. The heat pump system with enhanced vapor injection according to claim 1, wherein: the device also comprises a gas-liquid separator (8) arranged between the four-way valve (2) and the enhanced vapor injection compressor (1), wherein two ends of the gas-liquid separator (8) are respectively connected with the four-way valve (2) and the enhanced vapor injection compressor (1).
4. The heat pump system with enhanced vapor injection according to claim 1, wherein: the device also comprises an exhaust temperature detection unit (11) which is arranged at the output end of the enhanced vapor injection compressor (1) and is used for detecting and acquiring the exhaust temperature Tp.
5. A control method of a heat pump system with enhanced vapor injection according to any one of claims 1 to 4, characterized in that:
the method comprises the following steps:
s1, detecting and acquiring the operation frequency F1, the effluent temperature T1, the ambient temperature T4 and the actual opening P1 of an electronic expansion valve (6) of the enhanced vapor injection compressor (1) in real time when the operation time T1 of the heat pump system is up;
s2, selecting corresponding correction coefficients a, b and c based on the current environment temperature T4, and calculating and confirming a target opening P0 of the electronic expansion valve (6) by combining the operation frequency F0 and the outlet water temperature T1;
s3, comparing the actual opening P1 with the target opening P0, and correspondingly adjusting the electronic expansion valve (6) to the target opening P0;
s4, when the heat pump system continues to run for a time T3 after the previous adjusting action, detecting and acquiring the current compressor frequency F1, the outlet water temperature T1, the ambient temperature T4 and the actual opening P1 of the electronic expansion valve (6), and repeating the step S2 and the step S3 to correspondingly adjust the opening of the electronic expansion valve (6).
6. The control method of the heat pump system with enhanced vapor injection according to claim 5, characterized in that: in step S2, a target opening degree P0 of the confirmation electronic expansion valve (6) is calculated based on the calculation formula P0= a × F1+ B × T1+ c.
7. The control method of the heat pump system with enhanced vapor injection according to claim 5, characterized in that: when the calculated and confirmed target opening degree P0 is lower than the minimum opening degree value of the electronic expansion valve (6), the minimum opening degree value is used as the target opening degree P0.
8. The control method of the heat pump system with enhanced vapor injection according to claim 5, characterized in that: when the actual opening degree P1 is larger than the target opening degree P0, controlling the electronic expansion valve (6) to gradually reduce the opening degree at a preset adjusting rate until the target opening degree P0 is reached; on the contrary, when the actual opening degree P1 is smaller than the target opening degree P0, the electronic expansion valve (6) is controlled to gradually increase the opening degree at a predetermined adjustment rate until the target opening degree P0 is reached.
9. The control method of the heat pump system with enhanced vapor injection according to claim 8, characterized in that: when the difference between the actual opening degree P1 and the target opening degree P0 is smaller than the opening degree value of a single adjustment of the predetermined adjustment rate, the electronic expansion valve (6) is adjusted directly to the target opening degree P0.
10. The control method of the heat pump system with enhanced vapor injection according to claim 8, characterized in that: during monitoring and adjusting the opening degree of the electronic expansion valve (6), the exhaust gas temperature Tp of the enhanced vapor injection compressor (1) is monitored in real time, wherein when the exhaust gas temperature Tp exceeds a predetermined limit temperature Tpmax, the predetermined adjustment rate of the electronic expansion valve (6) is increased.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010602721.5A CN111692774A (en) | 2020-06-29 | 2020-06-29 | Heat pump system with enhanced vapor injection and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010602721.5A CN111692774A (en) | 2020-06-29 | 2020-06-29 | Heat pump system with enhanced vapor injection and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112781266A (en) * | 2020-12-04 | 2021-05-11 | 广东积微科技有限公司 | Enhanced vapor injection heat pump system and control method of electronic expansion valve thereof |
| CN112880122A (en) * | 2021-01-29 | 2021-06-01 | 广东积微科技有限公司 | Control method for lower limit of refrigeration humidity of air pipe type air conditioner |
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Application publication date: 20200922 |