CN111895603A - Heat pump unit system capable of defrosting without reducing water temperature and control method - Google Patents
Heat pump unit system capable of defrosting without reducing water temperature and control method Download PDFInfo
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- CN111895603A CN111895603A CN202010660120.XA CN202010660120A CN111895603A CN 111895603 A CN111895603 A CN 111895603A CN 202010660120 A CN202010660120 A CN 202010660120A CN 111895603 A CN111895603 A CN 111895603A
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- Prior art keywords
- way valve
- evaporator
- defrosting
- heat pump
- condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
- F25B2313/0211—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit the auxiliary heat exchanger being only used during defrosting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a heat pump unit system and a control method for defrosting without reducing water temperature, wherein one end of a compressor of the heat pump unit system is connected with the S end of a four-way valve through a pipeline, the other end of the compressor is connected with one end of a water path condenser through a pipeline, and the other end of the water path condenser is connected with the E end of the four-way valve through a pipeline; the C end of the four-way valve is connected with the auxiliary condenser through a pipeline; the auxiliary condenser is connected with the expansion valve through a pipeline; the other end of the expansion valve is connected with an evaporator through a pipeline, and the evaporator is connected with the D end of the four-way valve through a pipeline. According to the invention, through switching of the four-way valve of the unit, the auxiliary condenser is changed from a heating mode to a cooling mode, the cooling mode absorbs heat from the environment, the evaporator is changed from the cooling mode to the heating mode, the auxiliary condenser absorbs heat from the environment and inputs the heat into the evaporator through a pipeline, and the condenser is not influenced by defrosting operation in winter.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat pump unit system and a control method for defrosting without reducing water temperature.
Background
The air source heat pump is a high-efficiency energy-saving technology for producing domestic hot water, heating hot water and industrial hot water by utilizing low-grade heat energy in air. Especially, the heating in winter in northern areas is widely applied. The most common problem encountered by air source heat pumps during winter operation is the problem of finned evaporator frost formation and defrosting. Particularly in the weather and areas with high humidity in winter, when the heat pump operates, moisture in the air can frost on the surface of the fin evaporator, particularly on the windward side, the frost layer can be gradually thickened along with the operation of the heat pump, so that gaps among the fins are smaller and smaller, the damping of the air flowing into the heat pump fin evaporator is larger and larger, the thickening of the frost layer can also increase the thermal resistance between the evaporator and convective air, when the gaps among the fins are fully blocked by the frost layer, the air circulation of the heat pump evaporator is difficult to maintain, and under the condition, the heating capacity of the air source heat pump is greatly attenuated. Therefore, effective defrosting is extremely important to ensure reliable operation of the air source heat pump unit.
At present, a great deal of research is carried out on defrosting control methods of fin evaporators of air source heat pumps at home and abroad, and the main methods are summarized as follows: 1) and defrosting at regular time, and defrosting at regular time according to the heating operation time of the heat pump unit. 2) And setting defrosting conditions according to the difference between the ambient temperature and the temperature of the coil of the evaporator, and starting defrosting when the difference between the temperature of the coil and the ambient temperature is greater than a certain set difference. 3) And controlling defrosting by convection air pressure difference, and starting defrosting when the air pressure difference between the air inlet side and the air outlet side of the evaporator fin reaches a certain numerical value. 4) And determining defrosting conditions according to the humidity of the convection air and the difference between the determined ambient temperature and the temperature of the coil, and defrosting when the conditions are met. 5) The frost layer sensor controls a defrosting method, and frost layer detection is carried out through capacitance, temperature and other detection methods to defrost. 6) The infrared thermal imaging method is used for detecting frost layer and judging to defrost. 7) And carrying out defrosting fuzzy control on other parameters such as comprehensive environment temperature, humidity, evaporation pressure, coil temperature, unit defrosting accumulated running time and the like. In the defrosting mode, the water temperature is reduced along with defrosting in the defrosting process, the hot water supply is enough due to defrosting influence in winter, and the heat supply of an indoor unit is necessarily greatly influenced.
To solve this problem, the present invention is hereby proposed.
Disclosure of Invention
The invention aims to provide a heat pump unit system without water temperature reduction during defrosting, which solves the problem that the water temperature is reduced along with defrosting in the defrosting process of the conventional machine, and the supply of hot water quantity is influenced by defrosting in winter.
The purpose of the invention can be realized by the following technical scheme:
a heat pump unit system capable of defrosting without reducing water temperature comprises a compressor, a four-way valve, a water path condenser and an evaporator, wherein the four-way valve is provided with an S end, a C end, a D end and an E end; the C end of the four-way valve is connected with the auxiliary condenser through a pipeline; the auxiliary condenser is connected with the expansion valve through a pipeline; the other end of the expansion valve is connected with an evaporator through a pipeline, and the evaporator is connected with the D end of the four-way valve through a pipeline.
Further, the auxiliary condenser is provided with a first fan.
Further, the evaporator is provided with a second fan.
Further, the waterway condenser comprises a water inlet and a water outlet.
Further, when the unit is in defrosting operation, the exhaust port of the compressor enters the inlet of the condenser and then enters the E end of the four-way valve from the outlet of the condenser, the E end of the four-way valve is communicated with the C end of the four-way valve, the C end of the four-way valve is connected with the inlet of the auxiliary condenser, the outlet of the auxiliary condenser is connected with the inlet of the expansion valve, the outlet of the expansion valve is connected with the inlet of the evaporator, the outlet of the evaporator is connected with the D end of the four-way valve, the.
Further, install ambient temperature sensor and coil pipe temperature sensor on the evaporimeter, ambient temperature sensor is used for measuring outdoor ambient temperature, coil pipe temperature sensor is used for measuring the coil pipe temperature of evaporimeter.
The invention also aims to provide a heat pump unit control method without reducing water temperature during defrosting.
The purpose of the invention can be realized by the following technical scheme:
a control method of a heat pump unit without reducing water temperature during defrosting comprises the following steps,
s1, detecting the outdoor environment temperature and the coil temperature by the unit system through a temperature sensor, and turning to S2;
s2, judging whether the defrosting condition is reached, if yes, turning to S3, if no, turning to S1;
s3, switching a four-way valve of the heat pump unit, changing the heating mode of the auxiliary condenser into a cooling mode, changing the cooling mode of the evaporator into a heating mode, and turning to S4;
s4, judging whether the defrosting quit condition is reached, if yes, turning to S5, if no, turning to S6;
s5, switching a four-way valve of the heat pump unit, wherein the auxiliary condenser is changed into a heating mode from a cooling mode, and the evaporator is changed into a cooling mode from a heating mode;
and S6, operating the auxiliary condenser in a cooling mode and the evaporator in a heating mode.
The invention has the beneficial effects that:
according to the invention, through switching of the four-way valve of the unit, the auxiliary condenser is changed from a heating mode to a cooling mode, the cooling mode absorbs heat from the environment, the evaporator is changed from the cooling mode to the heating mode, the auxiliary condenser absorbs heat from the environment and inputs the heat into the evaporator through a pipeline to defrost the evaporator, and the condenser is not influenced by defrosting operation in winter.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a block diagram of a heat pump unit system for defrosting without reducing water temperature.
FIG. 2 is a flow chart of the heat pump unit control method for defrosting without reducing water temperature.
Reference numerals:
1-a compressor; 2-water outlet; 3-a water inlet; 4-a water path condenser; a 5-four-way valve; 6-a first fan; 7-an auxiliary condenser; 8-an expansion valve; 9-a second fan; 10-evaporator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a heat pump unit system for defrosting without reducing water temperature comprises a compressor 1, a four-way valve 5, a water path condenser 4 and an evaporator 10, wherein the four-way valve 5 is provided with an S end, a C end, a D end and an E end, one end of the compressor 1 is connected with the S end of the four-way valve 5 through a pipeline, the other end of the compressor 1 is connected with one end of the water path condenser 4 through a pipeline, and the other end of the water path condenser 4 is connected with the E end of the four-way valve 5 through a pipeline; the C end of the four-way valve 5 is connected with an auxiliary condenser 7 through a pipeline; the auxiliary condenser 7 is connected with an expansion valve 8 through a pipeline; the other end of the expansion valve 8 is connected with an evaporator 10 through a pipeline, and the evaporator 10 is connected with the D end of the four-way valve 5 through a pipeline.
Further, the auxiliary condenser 7 is provided with a first fan 6, and the evaporator 10 is provided with a second fan 9.
The waterway condenser 4 comprises a water inlet 3 and a water outlet 2.
When the unit is in defrosting operation, an exhaust port of the compressor 1 enters an inlet of the condenser 4 and then enters an E end of the four-way valve from an outlet of the condenser 4, the E end of the four-way valve is communicated with a C end of the four-way valve, the C end of the four-way valve is connected with an inlet of the auxiliary condenser 7, an outlet of the auxiliary condenser 7 is connected with an inlet of the expansion valve 8, an outlet of the expansion valve 8 is connected with an inlet of the evaporator 10, an outlet of the evaporator 10 is connected with a D end of the four-way valve.
An ambient temperature sensor and a coil temperature sensor are installed on the evaporator 10, the ambient temperature sensor is used for measuring the outdoor ambient temperature, and the coil temperature sensor is used for measuring the coil temperature of the evaporator.
Specifically, when the unit system is started, the outdoor environment temperature and the coil temperature are detected through the temperature sensor, whether the defrosting condition is achieved or not is judged according to the outdoor environment temperature and the coil temperature, the judging method belongs to the common knowledge, and all the technical personnel in the field can know that when the defrosting condition is achieved, the four-way valve of the unit is switched to the defrosting mode, the heating mode of the auxiliary condenser is changed to the refrigerating mode, the refrigerating mode absorbs heat from the environment, the refrigerating mode of the evaporator is changed to the heating mode, and the auxiliary condenser absorbs heat from the environment and inputs the heat to the evaporator through a pipeline to defrost the evaporator.
Referring to fig. 2, a method for controlling a heat pump unit without reducing water temperature during defrosting includes the following steps,
s1, detecting the outdoor environment temperature and the coil temperature by the unit system through a temperature sensor, and turning to S2;
s2, judging whether the defrosting condition is reached, if yes, turning to S3, if no, turning to S1;
s3, switching a four-way valve of the heat pump unit, changing the heating mode of the auxiliary condenser into a cooling mode, changing the cooling mode of the evaporator into a heating mode, and turning to S4;
s4, judging whether the defrosting quit condition is reached, if yes, turning to S5, if no, turning to S6;
s5, switching a four-way valve of the heat pump unit, wherein the auxiliary condenser is changed into a heating mode from a cooling mode, and the evaporator is changed into a cooling mode from a heating mode;
and S6, operating the auxiliary condenser in a cooling mode and the evaporator in a heating mode.
The auxiliary condenser is switched from a heating mode to a cooling mode through a unit four-way valve, the cooling mode absorbs heat from the environment, the evaporator is switched from the cooling mode to the heating mode, the auxiliary condenser absorbs heat from the environment and inputs the heat into the evaporator through a pipeline to defrost the evaporator, the condenser is not influenced by defrosting operation in winter, meanwhile, the temperature of a water tank of the existing air source water heater is as high as 70 ℃, the condensing temperature is also high, the energy efficiency is low, and under the condition that the temperature of the water tank is high, the condensing temperature can be reduced through the auxiliary condenser to realize high-energy-efficiency utilization.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A heat pump unit system capable of defrosting without reducing water temperature comprises a compressor (1), a four-way valve (5), a water path condenser (4) and an evaporator (10), wherein the four-way valve (5) is provided with an S end, a C end, a D end and an E end, one end of the compressor (1) is connected with the S end of the four-way valve (5) through a pipeline, the other end of the compressor (1) is connected with one end of the water path condenser (4) through a pipeline, and the other end of the water path condenser (4) is connected with the E end of the four-way valve (5) through a pipeline; the device is characterized by also comprising an auxiliary condenser (7), wherein the C end of the four-way valve (5) is connected with the auxiliary condenser (7) through a pipeline; the auxiliary condenser (7) is connected with an expansion valve (8) through a pipeline; the other end of the expansion valve (8) is connected with an evaporator (10) through a pipeline, and the evaporator (10) is connected with the D end of the four-way valve (5) through a pipeline.
2. A heat pump unit system for defrosting without lowering the water temperature according to claim 1, characterized in that the auxiliary condenser (7) is provided with a first fan (6).
3. A heat pump unit system for defrosting without lowering the water temperature according to claim 2, characterized in that the evaporator (10) is provided with a second fan (9).
4. A heat pump unit system that defrosts without lowering the water temperature according to claims 2-3, characterized in that the water circuit condenser (4) comprises a water inlet (3) and a water outlet (2).
5. A heat pump unit system according to claims 3-4, characterized in that when the unit is operated for defrosting, the air outlet of the compressor (1) enters the inlet of the condenser (4) and then enters the E end of the four-way valve from the outlet of the condenser (4), the E end of the four-way valve is connected to the C end of the four-way valve, the C end of the four-way valve is connected to the inlet of the auxiliary condenser (7), the outlet of the auxiliary condenser (7) is connected to the inlet of the expansion valve (8), the outlet of the expansion valve (8) is connected to the inlet of the evaporator (10), the outlet of the evaporator (10) is connected to the D end of the four-way valve, the D end of the four-way valve.
6. A heat pump unit system that eliminates water temperature degradation during defrost according to claim 5, wherein said evaporator (10) has an ambient temperature sensor mounted thereon for measuring outdoor ambient temperature and a coil temperature sensor for measuring coil temperature of the evaporator.
7. A control method of a heat pump unit for defrosting without lowering water temperature, using the heat pump unit system according to any one of claims 1 to 6, said control method comprising the steps of,
s1, detecting the outdoor environment temperature and the coil temperature by the unit system through a temperature sensor, and turning to S2;
s2, judging whether the defrosting condition is reached, if yes, turning to S3, if no, turning to S1;
s3, switching a four-way valve of the heat pump unit, changing the heating mode of the auxiliary condenser into a cooling mode, changing the cooling mode of the evaporator into a heating mode, and turning to S4;
s4, judging whether the defrosting quit condition is reached, if yes, turning to S5, if no, turning to S6;
s5, switching a four-way valve of the heat pump unit, wherein the auxiliary condenser is changed into a heating mode from a cooling mode, and the evaporator is changed into a cooling mode from a heating mode;
and S6, operating the auxiliary condenser in a cooling mode and the evaporator in a heating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660120.XA CN111895603A (en) | 2020-07-10 | 2020-07-10 | Heat pump unit system capable of defrosting without reducing water temperature and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010660120.XA CN111895603A (en) | 2020-07-10 | 2020-07-10 | Heat pump unit system capable of defrosting without reducing water temperature and control method |
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| CN111895603A true CN111895603A (en) | 2020-11-06 |
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| CN202010660120.XA Pending CN111895603A (en) | 2020-07-10 | 2020-07-10 | Heat pump unit system capable of defrosting without reducing water temperature and control method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759456A (en) * | 2014-01-27 | 2014-04-30 | 平武臣 | Heat exchange system of air conditioner or heat pump and defrosting method of heat exchange system |
| CN105066255A (en) * | 2015-09-01 | 2015-11-18 | 珠海格力电器股份有限公司 | Air conditioning system with continuous heat supply function in defrosting process |
| CN106225296A (en) * | 2016-09-05 | 2016-12-14 | 南京理工大学 | A kind of commutation defrosting net for air-source heat pump units and commutation Defrost method |
-
2020
- 2020-07-10 CN CN202010660120.XA patent/CN111895603A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759456A (en) * | 2014-01-27 | 2014-04-30 | 平武臣 | Heat exchange system of air conditioner or heat pump and defrosting method of heat exchange system |
| CN105066255A (en) * | 2015-09-01 | 2015-11-18 | 珠海格力电器股份有限公司 | Air conditioning system with continuous heat supply function in defrosting process |
| CN106225296A (en) * | 2016-09-05 | 2016-12-14 | 南京理工大学 | A kind of commutation defrosting net for air-source heat pump units and commutation Defrost method |
Non-Patent Citations (1)
| Title |
|---|
| 刘方亮等主编: "《建筑设备》", 28 February 2016, 北京理工大学出版社 * |
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Application publication date: 20201106 |
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