CN112815569B - Gas heat pump cold and hot water unit air conditioning system and control method thereof - Google Patents
Gas heat pump cold and hot water unit air conditioning system and control method thereof Download PDFInfo
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- CN112815569B CN112815569B CN202110050048.3A CN202110050048A CN112815569B CN 112815569 B CN112815569 B CN 112815569B CN 202110050048 A CN202110050048 A CN 202110050048A CN 112815569 B CN112815569 B CN 112815569B
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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
- 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
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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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
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Abstract
The invention discloses a gas heat pump cold and hot water unit air conditioning system and a control method thereof, the system comprises a refrigerant system, a cooling water system and an air conditioning water system, a first defrosting mode and a second defrosting mode are used in the gas heat pump cold and hot water unit air conditioning system, a first waste heat recoverer is used as an evaporator of the refrigerant system in the first defrosting mode and transmits the heat of the refrigerant system to the cooling water system, a water side heat exchanger is used as the evaporator of the refrigerant system in the second defrosting mode and transmits the heat of the refrigerant system to the air conditioning water system, and the water temperature is not reduced during defrosting by optimizing a defrosting treatment mode.
Description
Technical Field
The invention relates to the field of gas-driven air source heat pump air conditioners, in particular to a gas heat pump cold and hot water unit air conditioning system and a control method thereof.
Background
The gas heat pump adopts a gas engine to drive a refrigerant compressor to operate so as to realize a vapor compression refrigeration cycle. The practical application of the method has the following problems:
at present, when heating and defrosting are carried out on an air source gas heat pump water chiller-heater unit, reverse circulation defrosting is adopted or only a small part of refrigerant is led for defrosting, but the problems of large water temperature fluctuation at a user side or overlong defrosting period can be caused.
Disclosure of Invention
Aiming at the problems, the invention provides a gas heat pump cold and hot water unit air conditioning system and a control method thereof, which mainly solve the problem that the water temperature fluctuation of a user side of a gas heat pump is large.
In order to solve the technical problem, the invention provides two optional gas heat pump cold and hot water unit air conditioning systems, which comprise the following components:
the first gas heat pump cold and hot water unit air conditioning system comprises a refrigerant system, a cooling water system and an air conditioning water system;
the refrigerant system comprises a compressor, the output end of the compressor is connected with the input end of an oil separator, the output end of the oil separator is connected with the input end of the compressor, the output end of the oil separator is connected with the D end of a four-way valve, the C end of the four-way valve is sequentially connected with a first outdoor heat exchanger, a first two-way valve, a first filter, an electronic expansion valve, a second filter, a liquid reservoir, a second two-way valve and a heat medium channel of a water side heat exchanger, the outlet of the heat medium channel of the water side heat exchanger is connected with the E end of the four-way valve, a pipeline between the first two-way valve and the first filter is connected with one end of a first electromagnetic valve, a pipeline between the second filter and the liquid reservoir is connected with one end of a second electromagnetic valve, the other end of the first electromagnetic valve and the other end of the second electromagnetic valve are connected to the heat medium channel of a first waste heat recoverer through the same node, the heat medium channel outlet of the first waste heat recoverer and the S end of the four-way valve are connected with the input end of a gas-liquid separator, the S end of the four-way valve is also provided with a one-way valve pointing to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected with the input end of the compressor;
the cooling water system is used for recovering waste heat of a gas engine, the gas engine is used for conveying power to the compressor, and a cold medium channel of the first waste heat recoverer is connected with any section of pipeline of the cooling water system;
the cold medium channel of the water side heat exchanger is connected with any section of pipeline of the air-conditioning water system, the any section of pipeline of the air-conditioning water system is also connected with the cold medium channel of the second waste heat recoverer, and the hot medium channel of the second waste heat recoverer is connected with any section of pipeline of the cooling water system.
In some embodiments, the cooling water system includes a first water pump, an output end of the first water pump is connected to a cooling pipeline inside the gas engine and then connected to parallel branches, one of the parallel branches is connected to one of ends of a fourth electromagnetic valve, the other end of the fourth electromagnetic valve is sequentially connected to a second outdoor heat exchanger, a cold medium channel of the first waste heat recoverer, a hot medium channel of the second waste heat recoverer, and a third filter, the third filter is connected to an input end of the first water pump, the other branch of the parallel branches is connected to one of ends of a fifth electromagnetic valve, the other end of the fifth electromagnetic valve is connected to a cold medium channel of a third waste heat recoverer, the hot medium channel of the third waste heat recoverer is connected to any section of a domestic hot water system, and a pipeline between the cold medium channel of the first waste heat recoverer and the hot medium channel of the second waste heat recoverer And the input end of the third filter is connected with the input end of the third filter through a sixth electromagnetic valve.
In some embodiments, the domestic hot water system comprises a third water pump, a heat medium channel of the third waste heat recoverer, a hot water tank and a fourth filter which are connected in sequence, and an input end of the fourth filter is connected with an input end of the third water pump.
In some embodiments, the air-conditioning water system comprises a second water pump, an output end of the second water pump is connected with the cold medium channel of the second waste heat recoverer through a third electromagnetic valve, an output end of the second water pump is further connected with the cold medium channel of the water-side heat exchanger, and the cold medium channel of the second waste heat recoverer and the cold medium channel of the water-side heat exchanger are output in parallel through the same node.
In some embodiments, the output end of the first outdoor heat exchanger is provided with a liquid pipe temperature sensor.
In some embodiments, the cold medium channel input end of the first waste heat recoverer is provided with a cooling water temperature sensor.
In some embodiments, an input end of the second water pump is provided with a water inlet temperature sensor, and an output end of the cold medium channel of the second waste heat recoverer and a parallel connection output end of the cold medium channel of the water-side heat exchanger are provided with water outlet temperature sensors; and an environment temperature sensor is arranged in the external environment of the gas heat pump cold and hot water unit air conditioning system.
And the second electromagnetic valve and the second two-way valve are cancelled on the basis of the first gas heat pump cold and hot water unit air conditioning system.
The control method is used for the first gas heat pump water chiller-heater unit air conditioning system and comprises a first defrosting mode, a second defrosting mode and a low-temperature heating mode; calculating a difference value between a detection value of the cooling water temperature sensor and a detection value of the water inlet temperature sensor before defrosting, if the difference value is larger than a preset temperature difference, selecting a first defrosting mode, and if not, selecting a second defrosting mode; when the detection value of the environment temperature sensor is smaller than a first preset temperature value, or the detection value of the environment temperature sensor is smaller than a second preset temperature value, and the difference value between the detection value of the environment temperature sensor and the detection value of the liquid pipe temperature sensor is smaller than a third preset temperature value, or the detection value of the liquid pipe temperature sensor is lower than a fourth preset temperature value, and the falling rate of the detection value of the liquid pipe temperature sensor is higher than a preset threshold value, entering the low-temperature heating mode;
the first defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve and the second electromagnetic valve are opened, and the second two-way valve and the first electromagnetic valve are closed;
the second defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve and the second two-way valve are opened, and the first electromagnetic valve and the second electromagnetic valve are closed;
the low-temperature heating mode comprises the following control processes: and the D end and the E end of the four-way valve are communicated, the C end and the S end of the four-way valve are communicated, the second two-way valve and the first electromagnetic valve are opened, and the first two-way valve and the second electromagnetic valve are closed.
The control method is used for the second gas heat pump water chiller-heater unit air conditioning system and comprises a third defrosting mode and a low-temperature heating mode; when the detection value of the environment temperature sensor is smaller than a first preset temperature value, or the detection value of the environment temperature sensor is smaller than a second preset temperature value, and the difference value between the detection value of the environment temperature sensor and the detection value of the liquid pipe temperature sensor is smaller than a third preset temperature value, or the detection value of the liquid pipe temperature sensor is lower than a fourth preset temperature value, and the falling rate of the detection value of the liquid pipe temperature sensor is higher than a preset threshold value, entering the low-temperature heating mode;
the third defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve is opened, and the first electromagnetic valve is closed;
the low-temperature heating mode comprises the following control processes: and the D end and the E end of the four-way valve are communicated, the C end and the S end are communicated, the first electromagnetic valve is opened, and the first two-way valve is closed.
The invention has the beneficial effects that: the first defrosting mode and the second defrosting mode are used for the gas heat pump cold and hot water unit air conditioning system, the first waste heat recoverer is used as an evaporator of the refrigerant system in the first defrosting mode and transmits heat of the refrigerant system to the cooling water system, the water side heat exchanger is used as the evaporator of the refrigerant system in the second defrosting mode and transmits heat of the refrigerant system to the air conditioning water system, and the water temperature is not reduced during defrosting by optimizing a defrosting processing mode. In addition, the energy efficiency and the reliability of the gas heat pump cold and hot water unit are improved by optimizing the switching conditions of the low-temperature heating evaporator.
Drawings
FIG. 1 is a schematic diagram of an air conditioning system of a gas heat pump chiller-heater unit according to an embodiment of the present invention;
wherein: 1-a compressor, 2-an oil separator, 3-a four-way valve, 4-a first outdoor heat exchanger, 5-a first two-way valve, 6-a first filter, 7-an electronic expansion valve, 8-a second filter, 9-a liquid reservoir, 10-a second two-way valve, 11-a water side heat exchanger, 12-a first electromagnetic valve, 13-a second electromagnetic valve, 14-a first waste heat recoverer, 15-a gas-liquid separator, 16-a gas engine, 17-a second waste heat recoverer, 18-a first water pump, 19-a fourth electromagnetic valve, 20-a second outdoor heat exchanger, 21-a third filter, 22-a fifth electromagnetic valve, 23-a third waste heat recoverer, 24-a sixth electromagnetic valve, 25-a third water pump, 26-a hot water tank, 27-a fourth filter, 28-a second water pump, 29-a third electromagnetic valve and 30-a one-way valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Example one
As shown in fig. 1, the embodiment provides an air conditioning system of a gas heat pump cold and hot water unit, which includes a refrigerant system, a cooling water system and an air conditioning water system;
the refrigerant system comprises a compressor 1, the output end of the compressor 1 is connected with the input end of an oil separator 2, the output end of the oil separator 2 is connected with the input end of the compressor 1, the output end of the oil separator 2 is connected with the D end of a four-way valve 3, the C end of the four-way valve 3 is sequentially connected with a first outdoor heat exchanger 4, a first two-way valve 5, a first filter 6, an electronic expansion valve 7, a second filter 8, a liquid storage device 9, a second two-way valve 10 and a heat medium channel of a water side heat exchanger 11, the outlet of the heat medium channel of the water side heat exchanger 11 is connected with the E end of the four-way valve 3, a pipeline between the first two-way valve 5 and the first filter 6 is connected with one end of a first electromagnetic valve 12, a pipeline between the second filter 8 and the liquid storage device 9 is connected with one end of a second electromagnetic valve 13, the other end of the first electromagnetic valve 12 and the other end of the second electromagnetic valve 13 are connected with the heat medium channel of a first waste heat recoverer 14 through the same node, the outlet of the heat medium channel of the first waste heat recoverer 14 and the S end of the four-way valve 3 are connected with the input end of a gas-liquid separator 15, the S end of the four-way valve 3 is also provided with a one-way valve 30 pointing to the input end of the gas-liquid separator 15, and the output end of the gas-liquid separator 15 is connected with the input end of the compressor 1;
the cooling water system is used for recovering waste heat of the gas engine 16, the gas engine 16 is used for conveying power to the compressor 1, and a cold medium channel of the first waste heat recoverer 14 is connected with any section of pipeline of the cooling water system;
the cold medium channel of the water side heat exchanger 11 is connected with any section of pipeline of the air conditioning water system, the any section of pipeline of the air conditioning water system is also connected with the cold medium channel of the second waste heat recoverer 17, and the hot medium channel of the second waste heat recoverer 17 is connected with any section of pipeline of the cooling water system.
The cooling water system comprises a first water pump 18, the output end of the first water pump 18 is connected with a cooling pipeline inside the gas engine 16 and then connected with parallel branches, one branch of the parallel branches is connected with one end of a fourth electromagnetic valve 19, the other end of the fourth electromagnetic valve 19 is sequentially connected with a second outdoor heat exchanger 20, a cold medium channel of a first waste heat recoverer 14, a heat medium channel of a second waste heat recoverer 17 and a third filter 21, the third filter 21 is connected with the input end of the first water pump 18, the other branch of the parallel branches is connected with one end of a fifth electromagnetic valve 22, the other end of the fifth electromagnetic valve 22 is connected with the cold medium channel of a third waste heat recoverer 23, the heat medium channel of the third waste heat recoverer 23 is connected with any section of pipeline of a domestic hot water system, and a pipeline between the cold medium channel of the first waste heat recoverer 14 and the heat medium channel of the second waste heat recoverer 17 is connected with the input end of the third filter 21 through a sixth electromagnetic valve 24 .
The domestic hot water system comprises a third water pump 25, a heat medium channel of a third waste heat recoverer 23, a hot water tank 26 and a fourth filter 27 which are sequentially connected, and the input end of the fourth filter 27 is connected with the input end of the third water pump 25.
The air-conditioning water system comprises a second water pump 28, the output end of the second water pump 28 is connected with the cold medium channel of the second waste heat recoverer 17 through a third electromagnetic valve 29, the output end of the second water pump 28 is also connected with the cold medium channel of the water side heat exchanger 11, and the cold medium channel of the second waste heat recoverer 17 and the cold medium channel of the water side heat exchanger 11 are connected in parallel through the same node for output.
The output end of the first outdoor heat exchanger 4 is provided with a liquid pipe temperature sensor T5.
The input end of the cooling medium passage of the first waste heat recoverer 14 is provided with a cooling water temperature sensor T1. The output end of the second water pump 28 is provided with an inlet water temperature sensor T2, and the parallel output ends of the cold medium channel of the second waste heat recoverer 17 and the cold medium channel of the water-side heat exchanger 11 are provided with an outlet water temperature sensor T3; an environment temperature sensor T4 is arranged in the external environment of the air conditioning system of the gas heat pump water chiller-heater unit, and an outlet water temperature sensor T3 does not participate in the control method of the invention, but is necessary to be used as an outlet water temperature sensor of the air conditioner, and generally displays that the current water temperature meter participates in energy regulation control to a user.
The heat exchanger and the heat recoverer are generally arranged at the output end of the water pump, so that the advantage that the pressure of the output end is relatively high is facilitated, and the heat exchange efficiency of the main machine is improved.
Example two
On the basis of the first embodiment described above, the second solenoid valve 13 and the second two-way valve 10 may be eliminated for the sake of structural design or cost consideration. But only one defrost mode, i.e., the third defrost mode described in example four, is maintained.
EXAMPLE III
A control method of a gas heat pump cold and hot water unit air conditioning system is used for the gas heat pump cold and hot water unit air conditioning system in the first embodiment and comprises a first defrosting mode and a second defrosting mode; calculating a difference value between a detection value of a cooling water temperature sensor T1 and a detection value of an inlet water temperature sensor T2 before defrosting, if the difference value is larger than a preset temperature difference (default 18 ℃), selecting a first defrosting mode, and otherwise, selecting a second defrosting mode; when the detection value of the ambient temperature sensor T4 is smaller than a first preset temperature value (e.g., -10 ℃), or the detection value of the ambient temperature sensor T4 is smaller than a second preset temperature value (e.g., -5 ℃), and the difference between the detection value of the ambient temperature sensor T4 and the detection value of the liquid pipe temperature sensor T5 is smaller than a third preset temperature value (e.g., -5 ℃), or the detection value of the liquid pipe temperature sensor T5 is lower than a fourth preset temperature value (e.g., -5 ℃), and the falling rate of the detection value of the liquid pipe temperature sensor T5 is higher than a preset threshold value (e.g., 2 ℃), entering a low-temperature heating mode;
the first defrost mode includes the following control processes: the D end and the C end of the four-way valve 3 are communicated, the S end and the E end are communicated, the first two-way valve 5 and the second electromagnetic valve 13 are opened, and the second two-way valve 10 and the first electromagnetic valve 12 are closed; the refrigerant passes through the exhaust of the compressor 1, the oil separator 2, the C end of the four-way valve 3, the first outdoor heat exchanger 4, the first two-way valve 5, the first filter 6, the electronic expansion valve 7 and the second filter 8, and then returns to the compressor 1 through the first waste heat recoverer 14 and the gas-liquid separator 15 to complete the circulation.
The second defrost mode includes the following control process: the D end and the C end of the four-way valve 3 are communicated, the S end and the E end are communicated, the first two-way valve 5 and the second two-way valve 10 are opened, the first electromagnetic valve 12 and the second electromagnetic valve 13 are closed, and the refrigerant returns to the compressor 1 through the second two-way valve 10, the water side heat exchanger 11 and the gas-liquid separator 15 to complete circulation after passing through the exhaust gas of the compressor 1, the oil separator 2, the C end of the four-way valve 3, the first outdoor heat exchanger 4, the first two-way valve 5, the first filter 6, the electronic expansion valve 7 and the second filter 8;
the low-temperature heating mode comprises the following control processes: the D end and the E end of the four-way valve 3 are communicated, the C end and the S end are communicated, the second two-way valve 10 and the first electromagnetic valve 12 are opened, the first two-way valve 5 and the second electromagnetic valve 13 are closed, and the refrigerant returns to the compressor 1 through the exhaust of the compressor 1, the oil separator 2, the E end of the four-way valve 3, the water side heat exchanger 11, the second two-way valve 10, the second filter 8, the electronic expansion valve 7, the first filter 6, the first electromagnetic valve 12, the first waste heat recoverer 14 and the gas-liquid separator 15 to complete circulation.
The first defrosting mode and the second defrosting mode are used in the gas heat pump chiller-heater air conditioning system designed in the first embodiment, in the first defrosting mode, the first waste heat recoverer 14 serves as an evaporator of a refrigerant system and transfers heat of the refrigerant system to a cooling water system, in the second defrosting mode, the water side heat exchanger 11 serves as an evaporator of the refrigerant system and transfers heat of the refrigerant system to an air conditioning water system, and by optimizing a defrosting treatment mode, water temperature is not reduced during defrosting. In addition, the energy efficiency and the reliability of the gas heat pump cold and hot water unit are improved by optimizing the switching conditions of the low-temperature heating evaporator.
Through the analysis of the judgment conditions of the first defrosting mode and the second defrosting mode, if the difference is greater than the preset temperature difference (default 18 ℃), the first defrosting mode is adopted, although the water-side heat exchanger 11 as an evaporator will reduce the temperature of the air-conditioning water system, because the cooling water temperature is high enough, the heat recovered by the second waste heat recoverer 17 is enough to make up for the loss. If the second defrosting mode is adopted, the temperature of the cooling water recovered by the first waste heat recoverer 14 as an evaporator may be lower than the temperature of the air conditioning water system, and the recovery effect of the second waste heat recoverer 17 is greatly reduced or even adversely affected. Therefore, through the system design and the control method, the defrosting effect is greatly improved.
During refrigeration: the first waste heat recoverer 14 and the second waste heat recoverer 17 do not operate, that is, the first electromagnetic valve 12 and the third electromagnetic valve 29 are not opened, and the cooling water is cooled by the third waste heat recoverer 23 and the second outdoor heat exchanger 20. The first water pump 18 is started, the fifth and sixth electromagnetic valves 22 and 24 are opened, and then the fourth and sixth electromagnetic valves 19 and 24 are adjusted according to the temperature of T1. As shown in table 1 below.
TABLE 1 refrigeration mode control method
In the conventional heating process: the second outdoor heat exchanger 20 and the first waste heat recoverer 14 do not work, that is, the first electromagnetic valve 12 and the fourth electromagnetic valve 19 are not opened, and the cooling water is cooled by the second waste heat recoverer 17, the third waste heat recoverer 23 and the second outdoor heat exchanger 20. As shown in table 2 below.
TABLE 2 control method of conventional heating mode
And (3) during low-temperature heating: the second outdoor heat exchanger 20 does not normally operate, that is, the fourth electromagnetic valve is not opened, and the cooling water is cooled by the first, second, and third waste heat recoverers. The fourth solenoid valve and the second outdoor heat exchanger 20 are opened when the water temperature is too high to approach the protection, as shown in table 3 below.
TABLE 3 control method for low-temperature heating mode
T1min and T1max are related to the model selection of the outdoor heat exchanger, the first waste heat recoverer 14 and the second waste heat recoverer 17, the cooling water temperature returned to the engine is low when T1 is smaller than Tmin, and the cooling water temperature returned to the engine is too high when T1 is larger than Tmax, which are both unfavorable for the operation of the engine.
Wherein, Δ T1, Δ T2, Δ T3 and Δ T4 are design temperature differences, specifically, Δ T1, Δ T2, Δ T3 and Δ T4 refer to control intervals of specific electromagnetic valve switch combinations, and the switches of the electromagnetic valves are controlled according to the temperature intervals of the cooling water temperature T1. T1min is the lowest temperature of cooling water recovery, T1 is higher than T1min and can begin to recover cooling water heat, otherwise the temperature of cooling water returning to the engine is low, which is not beneficial to the work of the engine. T2min is the minimum recovery temperature T1min of the cooling water plus a preset heat exchanger temperature difference, and if the minimum recovery temperature T1min of the cooling water is 30 degrees and the preset heat exchanger temperature difference is 5 degrees (enough temperature difference can make the heat recovery process smoother), T2min is 35 degrees. T1max is the cooling water overheat protection temperature, and if it exceeds this value, the engine is damaged by the excessively high cooling water temperature. The above concept of temperature design is conventional writing and can be recognized by those skilled in the art.
Example four
A control method of a gas heat pump cold and hot water unit air conditioning system is used for the gas heat pump cold and hot water unit air conditioning system in the second embodiment and comprises a third defrosting mode and a low-temperature heating mode; when the detection value of the ambient temperature sensor T4 is smaller than a first preset temperature value (e.g., -10 ℃), or the detection value of the ambient temperature sensor T4 is smaller than a second preset temperature value (e.g., -5 ℃), and the difference between the detection value of the ambient temperature sensor T4 and the detection value of the liquid pipe temperature sensor T5 is smaller than a third preset temperature value (e.g., -5 ℃), or the detection value of the liquid pipe temperature sensor T5 is lower than a fourth preset temperature value (e.g., -5 ℃), and the falling rate of the detection value of the liquid pipe temperature sensor T5 is higher than a preset threshold value (e.g., 2 ℃), entering a low-temperature heating mode;
the third defrost mode includes the following control processes: the D end and the C end of the four-way valve 3 are communicated, the S end and the E end are communicated, the first two-way valve 5 is opened, and the first electromagnetic valve 12 is closed;
the low-temperature heating mode comprises the following control processes: and the D end and the E end of the four-way valve are communicated, the C end and the S end of the four-way valve are communicated, the first electromagnetic valve is opened 12, and the first two-way valve 5 is closed.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (4)
1. An air conditioning system of a gas heat pump cold and hot water unit is characterized by comprising a refrigerant system, a cooling water system and an air conditioning water system;
the refrigerant system comprises a compressor, the output end of the compressor is connected with the input end of an oil separator, the output end of the oil separator is connected with the input end of the compressor, the output end of the oil separator is connected with the D end of a four-way valve, the C end of the four-way valve is sequentially connected with a first outdoor heat exchanger, a first two-way valve, a first filter, an electronic expansion valve, a second filter, a liquid reservoir, a second two-way valve and a heat medium channel of a water side heat exchanger, the outlet of the heat medium channel of the water side heat exchanger is connected with the E end of the four-way valve, a pipeline between the first two-way valve and the first filter is connected with one end of a first electromagnetic valve, a pipeline between the second filter and the liquid reservoir is connected with one end of a second electromagnetic valve, the other end of the first electromagnetic valve and the other end of the second electromagnetic valve are connected to the heat medium channel of a first waste heat recoverer through the same node, the heat medium channel outlet of the first waste heat recoverer and the S end of the four-way valve are connected with the input end of a gas-liquid separator, the S end of the four-way valve is also provided with a one-way valve pointing to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected with the input end of the compressor;
the cooling water system is used for recovering waste heat of a gas engine, the gas engine is used for conveying power to the compressor, and a cold medium channel of the first waste heat recoverer is connected with any section of pipeline of the cooling water system;
the cold medium channel of the water side heat exchanger is connected with any section of pipeline of the air-conditioning water system, the any section of pipeline of the air-conditioning water system is also connected with the cold medium channel of a second waste heat recoverer, and the hot medium channel of the second waste heat recoverer is connected with any section of pipeline of the cooling water system;
the cooling water system comprises a first water pump, an output end of the first water pump is connected with a cooling pipeline in the gas engine and then connected with parallel branches, one branch of the parallel branches is connected with one end of a fourth electromagnetic valve, the other end of the fourth electromagnetic valve is sequentially connected with a second outdoor heat exchanger, a cold medium channel of the first waste heat recoverer, a heat medium channel of the second waste heat recoverer and a third filter, the third filter is connected with an input end of the first water pump, the other branch of the parallel branches is connected with one end of a fifth electromagnetic valve, the other end of the fifth electromagnetic valve is connected with the cold medium channel of a third waste heat recoverer, the heat medium channel of the third waste heat recoverer is connected with any section of a domestic hot water system, and a pipeline between the cold medium channel of the first waste heat recoverer and the heat medium channel of the second recoverer is connected with a third electromagnetic valve through a sixth electromagnetic valve An input of the third filter;
the domestic hot water system comprises a third water pump, a heat medium channel of the third waste heat recoverer, a hot water tank and a fourth filter which are sequentially connected, wherein the input end of the fourth filter is connected with the input end of the third water pump;
the air-conditioning water system comprises a second water pump, the output end of the second water pump is connected with the cold medium channel of the second waste heat recoverer through a third electromagnetic valve, the output end of the second water pump is also connected with the cold medium channel of the water side heat exchanger, and the cold medium channel of the second waste heat recoverer and the cold medium channel of the water side heat exchanger are connected in parallel through the same node and output;
a liquid pipe temperature sensor is arranged at the output end of the first outdoor heat exchanger;
the input end of a cold medium channel of the first waste heat recoverer is provided with a cooling water temperature sensor;
the output end of the second water pump is provided with a water inlet temperature sensor, and the parallel output ends of the cold medium channel of the second waste heat recoverer and the cold medium channel of the water-side heat exchanger are provided with water outlet temperature sensors; and an environment temperature sensor is arranged in the external environment of the gas heat pump cold and hot water unit air conditioning system.
2. The gas heat pump chiller air conditioning system of claim 1 wherein said second solenoid valve and said second two-way valve are eliminated.
3. A control method of a gas heat pump chiller/heater unit air conditioning system is characterized in that the control method is used for the gas heat pump chiller/heater unit air conditioning system as claimed in claim 1, and comprises a first defrosting mode, a second defrosting mode and a low-temperature heating mode; calculating a difference value between a detection value of the cooling water temperature sensor and a detection value of the water inlet temperature sensor before defrosting, if the difference value is larger than a preset temperature difference, selecting a first defrosting mode, and if not, selecting a second defrosting mode; when the detection value of the environment temperature sensor is smaller than a first preset temperature value, or the detection value of the environment temperature sensor is smaller than a second preset temperature value, and the difference value between the detection value of the environment temperature sensor and the detection value of the liquid pipe temperature sensor is smaller than a third preset temperature value, or the detection value of the liquid pipe temperature sensor is lower than a fourth preset temperature value, and the falling rate of the detection value of the liquid pipe temperature sensor is higher than a preset threshold value, entering the low-temperature heating mode;
the first defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve and the second electromagnetic valve are opened, and the second two-way valve and the first electromagnetic valve are closed;
the second defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve and the second two-way valve are opened, and the first electromagnetic valve and the second electromagnetic valve are closed;
the low-temperature heating mode comprises the following control processes: and the D end and the E end of the four-way valve are communicated, the C end and the S end of the four-way valve are communicated, the second two-way valve and the first electromagnetic valve are opened, and the first two-way valve and the second electromagnetic valve are closed.
4. A control method of a gas heat pump chiller/heater unit air conditioning system, which is used for the gas heat pump chiller/heater unit air conditioning system of claim 2, and comprises a third defrosting mode and a low-temperature heating mode; when the detection value of the environment temperature sensor is smaller than a first preset temperature value, or the detection value of the environment temperature sensor is smaller than a second preset temperature value, and the difference value between the detection value of the environment temperature sensor and the detection value of the liquid pipe temperature sensor is smaller than a third preset temperature value, or the detection value of the liquid pipe temperature sensor is lower than a fourth preset temperature value, and the falling rate of the detection value of the liquid pipe temperature sensor is higher than a preset threshold value, entering the low-temperature heating mode;
the third defrost mode includes the following control process: the D end and the C end of the four-way valve are communicated, the S end and the E end of the four-way valve are communicated, the first two-way valve is opened, and the first electromagnetic valve is closed;
the low-temperature heating mode comprises the following control processes: and the D end and the E end of the four-way valve are communicated, the C end and the S end are communicated, the first electromagnetic valve is opened, and the first two-way valve is closed.
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| CN115218309B (en) * | 2022-07-20 | 2023-12-19 | 南京天加环境科技有限公司 | Gas heat pump cold and hot water unit, control method and air conditioner |
| CN115307338B (en) * | 2022-08-12 | 2023-12-01 | 南京天加环境科技有限公司 | Heat recovery device of gas heat pump and control method |
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| KR101698261B1 (en) * | 2015-01-12 | 2017-01-19 | 엘지전자 주식회사 | Air conditioner and control method thereof |
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