CN110671834A - Heat pump system and defrosting method thereof - Google Patents
Heat pump system and defrosting method thereof Download PDFInfo
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- CN110671834A CN110671834A CN201910897166.0A CN201910897166A CN110671834A CN 110671834 A CN110671834 A CN 110671834A CN 201910897166 A CN201910897166 A CN 201910897166A CN 110671834 A CN110671834 A CN 110671834A
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B49/022—Compressor control arrangements
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of heat pumps, in particular to a heat pump system, which comprises a compressor, a four-way valve, a heat exchanger, a fin heat exchanger and a gas-liquid separator, wherein the compressor, the four-way valve, the heat exchanger, the fin heat exchanger and the gas-liquid separator are connected into a refrigerant loop through pipelines; and a bypass electromagnetic valve and an expansion valve are arranged on a pipeline between the heat exchanger and the fin heat exchanger in parallel. The bypass electromagnetic valve and the expansion valve are arranged on the pipeline between the heat exchanger and the fin heat exchanger in parallel, when the heat pump system defrosts, the expansion valve and the bypass electromagnetic valve are opened simultaneously, the expansion valve and the bypass electromagnetic valve are opened to split the inflow refrigerant, and the total flow of the refrigerant flowing in the pipeline is increased, so that the flow of the refrigerant entering the fin heat exchanger is increased, and the defrosting enhancement effect is achieved.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat pump system and a defrosting method thereof.
Background
The heat pump is also called a cold machine, and is a high-efficiency heating device generated on the basis of the second law of thermodynamics, and can transmit energy from a low-temperature place (a low-temperature heat reservoir) to a high-temperature place (a high-temperature heat reservoir). The total energy which can be provided for the high temperature is larger than the energy required by the operation of the high temperature, and the extra heat is obtained from the lower temperature under the action of the operation energy.
The heat pump absorbs heat from a lower temperature part when low-boiling-point liquid is evaporated after being decompressed by the throttle valve, then compresses vapor by the compressor to increase the temperature, releases the absorbed heat when passing through the condenser to be liquefied, and then returns to the throttle valve. The circulation can continuously transfer heat from a place with lower temperature to a place with higher temperature (needing heat).
In the heat pump system in the prior art, the valve in the pipeline limits the flow of the refrigerant, so that the flow of the refrigerant is small when the heat pump system defrosts, and the defrosting effect is influenced. Therefore, in view of the above situation, there is a need to develop a heat pump system to overcome the shortcomings of the current practical application.
Disclosure of Invention
The present invention is directed to a heat pump system and a defrosting method thereof, which solve the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat pump system comprises a compressor, a four-way valve, a heat exchanger, a fin heat exchanger and a gas-liquid separator which are connected into a refrigerant loop through pipelines, wherein when the heat pump system heats, the heat exchanger is used as a condenser, and the fin heat exchanger is used as an evaporator; and a bypass electromagnetic valve and an expansion valve are arranged on a pipeline between the heat exchanger and the fin heat exchanger in parallel.
As a further scheme of the invention: the four-way valve comprises A, B, C and D four interfaces, when the heat pump system heats, the A port is communicated with the B port, the C port is communicated with the D port, when the heat pump system defrosts, the A port is communicated with the D port, and the B port is communicated with the C port.
As a further scheme of the invention: and the compressor is provided with a current sensor, a high-pressure sensor and an exhaust probe.
As a further scheme of the invention: and the heat exchanger is provided with a water outlet probe, a water inlet probe and a cold inlet probe.
As a further scheme of the invention: and a coil pipe probe is arranged in the fin heat exchanger.
As a further scheme of the invention: and the gas-liquid separator is provided with a gas return probe and a low-pressure sensor.
As a further scheme of the invention: the heat pump system also comprises an environment probe used for detecting the environment temperature.
A defrosting method of a heat pump system, comprising the steps of:
s1, the accumulated running time of the compressor of the unit is more than or equal to T1, the environment temperature is less than or equal to S1, the temperature of the coil is less than or equal to S2, the system enters defrosting operation, the fan is closed, the four-way valve is started, the bypass electromagnetic valve is started, and the unit defrosts;
s2, when the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is more than or equal to the temperature S4 or the system high-pressure is more than or equal to Y1 or the compressor current is more than or equal to the rated current 1.4, the defrosting operation is kept, and after the fan operation time T3 is started:
1) if the defrosting operation time is not less than T2 and the temperature of the coil is not less than S3, stopping the defrosting operation, closing the four-way valve, closing the bypass electromagnetic valve, and normally heating the unit;
2) if the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is less than or equal to (S4-30), the high-pressure is less than or equal to (Y1-0.6) and the compressor current is less than or equal to the rated current, the fan is turned off, defrosting is continued until the defrosting operation time is greater than or equal to T2 and the coil temperature is greater than or equal to S3, defrosting is stopped, the four-way valve is turned off, the bypass electromagnetic valve is turned off, the fan is started.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the bypass electromagnetic valve and the expansion valve are arranged in parallel on the pipeline between the heat exchanger and the fin heat exchanger, when the heat pump system is defrosted, the expansion valve and the bypass electromagnetic valve are opened simultaneously, the expansion valve and the bypass electromagnetic valve are opened to split the inflow refrigerant, and the total flow of the refrigerant flowing in the pipeline is increased, so that the flow of the refrigerant entering the fin heat exchanger is increased, and the defrosting enhancement effect is achieved;
2. still install current sensor, high-pressure sensor and exhaust probe on the compressor for detect the current value of compressor, carry out pressure detection to exhaust high temperature high-pressure gas simultaneously, control the stop and start of outdoor fan through detecting exhaust, high-pressure, current value, reach the effect that reduces condensing pressure, play the effect of protection compressor, reduction unit fault rate and extension unit life.
Drawings
Fig. 1 is a heating normal heating operation diagram in the heat pump system.
Fig. 2 is a diagram illustrating a defrost state operation in the heat pump system.
In the figure: 1-compressor, 101-current sensor, 102-high pressure sensor, 103-exhaust probe, 2-four-way valve, 201-water outlet probe, 202-water inlet probe, 203-cold inlet probe, 3-heat exchanger, 4-bypass solenoid valve, 5-expansion valve, 6-fin heat exchanger, 601-coil probe, 7-blower, 8-gas-liquid separator, 801-gas return probe, 802-low pressure sensor, 9-environment probe.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-2, in an embodiment of the present invention, a heat pump system includes a compressor 1, a four-way valve 2, a heat exchanger 3, a fin heat exchanger 6, and a gas-liquid separator 8, which are connected to form a refrigerant loop through a pipeline, wherein when the heat pump system heats, the heat exchanger 3 serves as a condenser, and the fin heat exchanger 6 serves as an evaporator;
a bypass electromagnetic valve 4 and an expansion valve 5 are arranged on a pipeline between the heat exchanger 3 and the fin heat exchanger 6 in parallel, when the heat pump system heats, the expansion valve 5 is opened, a refrigerant flows from the heat exchanger 3 to the fin heat exchanger 6 through the expansion valve 5, when the heat pump system defrosts, the expansion valve 5 and the bypass electromagnetic valve 4 are opened simultaneously, the expansion valve 5 and the bypass electromagnetic valve 4 are opened to split the inflow refrigerant, the total flow of the refrigerant flowing in the pipeline is increased, the flow of the refrigerant entering the fin heat exchanger 6 is increased, and the defrosting enhancement effect is achieved;
the four-way valve 2 comprises A, B, C and D four interfaces, when a heat pump system heats, the port A is communicated with the port B, the port C is communicated with the port D, a gaseous refrigerant is compressed by the compressor 1 and then becomes high-temperature high-pressure gas, the high-temperature high-pressure gas enters the heat exchanger 3 and then is liquefied and released, then enters the fin heat exchanger 6 to absorb heat and become gas, and finally flows into the gas-liquid separator 8, and the gas outlet of the gas-liquid separator 8 discharges the gas into the compressor 1 for cyclic utilization;
when the heat pump system defrosts, the port A is communicated with the port D, the port B is communicated with the port C, a gaseous refrigerant is compressed by the compressor 1 and then is changed into high-temperature high-pressure gas, and the high-temperature high-pressure gas flows into the fin radiator 6 through the port A and the port D to defrost;
the compressor 1 is provided with a current sensor 101, a high-pressure sensor 102 and an exhaust probe 103, and is used for detecting the current value of the compressor 1 and detecting the pressure of the exhausted high-temperature high-pressure gas;
the heat exchanger 3 is provided with a water outlet probe 201, a water inlet probe 202 and a cold inlet probe 203;
a coil pipe probe 601 is arranged inside the fin heat exchanger 6 and used for detecting the temperature of a coil pipe inside the fin heat exchanger 6, and a fan 7 is arranged outside the fin heat exchanger 6;
the gas-liquid separator 8 is provided with a gas return probe 801 and a low-pressure sensor 802;
the heat pump system also comprises an environment probe 9 for detecting the environment temperature;
in the defrosting process, if the fin heat exchanger 6 of the unit is in a frostless state or a little frost state, the exhaust temperature, the high pressure value and the current value of the compressor can be rapidly increased, so that the stop and start of the outdoor fan are controlled by detecting the exhaust, high pressure and current values, the effect of reducing the condensation pressure is achieved, and the effects of protecting the compressor, reducing the failure rate of the unit and prolonging the service life of the unit are achieved.
Example 2
Referring to fig. 1-2, the defrosting method of the heat pump system includes the following steps:
s1, the accumulated running time of the compressor 1 of the unit is more than or equal to T1, the environment temperature is less than or equal to S1, the temperature of the coil is less than or equal to S2, the system enters defrosting operation, the fan 7 is closed, the four-way valve 2 is started, the bypass electromagnetic valve 4 is started, and the unit defrosts;
s2, when the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is more than or equal to the temperature S4 or the system high-pressure is more than or equal to Y1 or the compressor current is more than or equal to the rated current 1.4, the defrosting operation is kept, and after the fan operation time T3 is started:
1) if the defrosting operation time is more than or equal to T2 and the temperature of the coil is more than or equal to S3, stopping the defrosting operation, closing the four-way valve 2, closing the bypass electromagnetic valve 4, and normally heating the unit;
2) if the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is less than or equal to (S4-30), the high-pressure is less than or equal to (Y1-0.6) and the compressor current is less than or equal to the rated current, the fan 7 is turned off, defrosting is continued until the defrosting operation time is greater than or equal to T2 and the coil temperature is greater than or equal to S3, defrosting is stopped, the four-way valve 2 is turned off, the bypass electromagnetic valve 4 is turned off, the fan 7 is started.
Example 3
The defrosting method of the heat pump system comprises the following steps:
s1, the accumulated running time of the compressor 1 of the unit is more than or equal to 40min, the environment temperature is less than or equal to 7 ℃, the coil temperature is less than or equal to minus 3 ℃, the system enters defrosting operation, the fan 7 is closed, the four-way valve 2 is started, the bypass electromagnetic valve 4 is started, and the unit defrosts;
s2, when the defrosting operation time is less than or equal to 10min and the coil temperature is less than or equal to 18 ℃, the exhaust temperature is more than or equal to 115 ℃, the system high pressure is more than or equal to 2.8MPa, or the compressor current is more than or equal to the rated current 1.4A, the defrosting operation is kept, and after the fan is started for 1 min:
1) if the defrosting operation time is more than or equal to 10min and the temperature of the coil is more than or equal to 18 ℃, stopping the defrosting operation, closing the four-way valve 2, closing the bypass electromagnetic valve 4, and normally heating the unit;
2) if the defrosting operation time is less than or equal to 10min and the temperature of the coil is less than or equal to 18 ℃, the exhaust temperature is less than or equal to 85 ℃, the high-pressure is less than or equal to 2.2MPa and the current of the compressor is less than or equal to the rated current, the fan 7 is closed, defrosting is continued until the defrosting operation time is more than or equal to 10min and the temperature of the coil is more than or equal to 18 ℃, the defrosting is stopped, the four-way valve 2 is closed, the bypass electromagnetic valve 4 is closed, the.
According to the invention, the bypass electromagnetic valve and the expansion valve are arranged in parallel on the pipeline between the heat exchanger and the fin heat exchanger, when the heat pump system is defrosted, the expansion valve and the bypass electromagnetic valve are opened simultaneously, the expansion valve and the bypass electromagnetic valve are opened to split the inflow refrigerant, and the total flow of the refrigerant flowing in the pipeline is increased, so that the flow of the refrigerant entering the fin heat exchanger is increased, and the defrosting enhancement effect is achieved; still install current sensor, high-pressure sensor and exhaust probe on the compressor for detect the current value of compressor, carry out pressure detection to exhaust high temperature high-pressure gas simultaneously, control the stop and start of outdoor fan through detecting exhaust, high-pressure, current value, reach the effect that reduces condensing pressure, play the effect of protection compressor, reduction unit fault rate and extension unit life.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (7)
1. A heat pump system is characterized by comprising a compressor (1), a four-way valve (2), a heat exchanger (3), a fin heat exchanger (6) and a gas-liquid separator (8) which are connected into a refrigerant loop through pipelines, wherein when the heat pump system heats, the heat exchanger (3) is used as a condenser, and the fin heat exchanger (6) is used as an evaporator; a bypass electromagnetic valve (4) and an expansion valve (5) are arranged in parallel on a pipeline between the heat exchanger (3) and the fin heat exchanger (6); the compressor (1) is provided with a current sensor (101), a high-pressure sensor (102) and an exhaust probe (103).
2. The heat pump system according to claim 1, wherein the four-way valve (2) comprises A, B, C and D ports, wherein, during heating of the heat pump system, the A port is communicated with the B port, the C port is communicated with the D port, and during defrosting of the heat pump system, the A port is communicated with the D port, and the B port is communicated with the C port.
3. The heat pump system according to claim 1, wherein the heat exchanger (3) is provided with a water outlet probe (201), a water inlet probe (202) and a cold inlet probe (203).
4. A heat pump system according to claim 3, characterized in that a coil probe (601) is mounted inside the fin heat exchanger (6).
5. The heat pump system according to claim 4, wherein a return air probe (801) and a low pressure sensor (802) are mounted on the gas-liquid separator (8).
6. The heat pump system according to claim 1, further comprising an ambient probe (9) for sensing ambient temperature.
7. A defrosting method of a heat pump system according to any one of claims 1 to 6, comprising the steps of:
s1, the accumulated running time of the compressor (1) of the unit is more than or equal to T1, the environment temperature is less than or equal to S1, the temperature of the coil is less than or equal to S2, the system enters defrosting operation, the fan (7) is closed, the four-way valve (2) is started, the bypass electromagnetic valve (4) is started, and the unit defrosts;
s2, when the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is more than or equal to the temperature S4 or the system high-pressure is more than or equal to Y1 or the compressor current is more than or equal to the rated current 1.4, the defrosting operation is kept, and after the fan operation time T3 is started:
1) if the defrosting operation time is more than or equal to T2 and the temperature of the coil is more than or equal to S3, stopping the defrosting operation, closing the four-way valve (2), closing the bypass electromagnetic valve (4), and normally heating the unit;
2) if the defrosting operation time is less than or equal to T2 and the coil temperature is less than or equal to S3, the exhaust temperature is less than or equal to S4-30, the high-pressure is less than or equal to Y1-0.6 and the compressor current is less than or equal to the rated current, the fan (7) is turned off, defrosting is continued until the defrosting operation time is greater than or equal to T2 and the coil temperature is greater than or equal to S3, defrosting is stopped, the four-way valve (2) is turned off, the bypass electromagnetic valve (4) is turned off, the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910897166.0A CN110671834A (en) | 2019-09-23 | 2019-09-23 | Heat pump system and defrosting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910897166.0A CN110671834A (en) | 2019-09-23 | 2019-09-23 | Heat pump system and defrosting method thereof |
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| CN110671834A true CN110671834A (en) | 2020-01-10 |
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| CN201910897166.0A Pending CN110671834A (en) | 2019-09-23 | 2019-09-23 | Heat pump system and defrosting method thereof |
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| CN (1) | CN110671834A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531696A (en) * | 2020-04-13 | 2021-10-22 | 青岛海尔空调电子有限公司 | Air-cooled heat pump air conditioning system capable of efficiently heating |
| CN113932505A (en) * | 2021-10-09 | 2022-01-14 | 东莞市锦沐节能科技有限公司 | Intelligent optimized ice-free perception defrosting system for defrosting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113531696A (en) * | 2020-04-13 | 2021-10-22 | 青岛海尔空调电子有限公司 | Air-cooled heat pump air conditioning system capable of efficiently heating |
| CN113932505A (en) * | 2021-10-09 | 2022-01-14 | 东莞市锦沐节能科技有限公司 | Intelligent optimized ice-free perception defrosting system for defrosting |
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Application publication date: 20200110 |