CN113551330A - Refrigerant exchange cascade heating control method, controller and system - Google Patents
Refrigerant exchange cascade heating control method, controller and system Download PDFInfo
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- CN113551330A CN113551330A CN202110617592.1A CN202110617592A CN113551330A CN 113551330 A CN113551330 A CN 113551330A CN 202110617592 A CN202110617592 A CN 202110617592A CN 113551330 A CN113551330 A CN 113551330A
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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
- 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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using 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
- F25B41/20—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
- 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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- 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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
Abstract
The invention discloses a refrigerant exchange cascade-based heating control method, which comprises the following steps: acquiring an ambient temperature and a heating set temperature; calculating the temperature difference between the heating set temperature and the ambient temperature; judging whether the heating set temperature is smaller than a preset heating temperature or not and whether the temperature difference is smaller than a preset temperature difference or not; and if the judgment result is yes, heating according to a single-stage heating mode, wherein the low-temperature heating device is used for heating in the single-stage heating mode, and if the judgment result is no, heating is carried out according to a multi-stack heating mode, wherein in the multi-stack heating mode, the low-temperature heating device is used for heating firstly, and then the high-temperature heating device is used for heating. The invention also provides a cascade heating controller and a system based on refrigerant exchange. The invention can improve the heating capacity under the condition of low temperature, simultaneously reduce the energy consumption, improve the utilization rate of energy, simultaneously have the remote regulation function and greatly improve the convenience.
Description
Technical Field
The invention relates to the field of heating, in particular to a refrigerant exchange cascade heating control method and system.
Background
With the improvement of living standard and the continuous expansion of the housing area of cities, the demand of building heating energy consumption is increasing day by day. However, in severe cold areas, the heating method using a vapor compression heat pump or an absorption heat pump alone generally has the problems of poor low-temperature heating capability, low energy utilization rate, serious pollution and the like. In a single heating system, the heating capacity is poor at ultralow temperature (-below 15 ℃), and the single system cannot realize heat energy conversion under the condition of high water temperature requirement, so that a refrigerant exchange-based cascade heating control method, a controller and a system are urgently needed.
Disclosure of Invention
The invention aims to provide a refrigerant exchange cascade-based heating control method, a controller and a system, which can improve the heating capacity under the low-temperature condition, reduce the energy consumption and improve the utilization rate of energy.
In order to solve the technical problem, the invention provides a refrigerant exchange cascade heating control method, which comprises the following steps: acquiring an ambient temperature and a heating set temperature; calculating the temperature difference between the heating set temperature and the ambient temperature; judging whether the heating set temperature is smaller than a preset heating temperature or not and whether the temperature difference is smaller than a preset temperature difference or not; and if the judgment result is yes, heating according to a single-stage heating mode, wherein the low-temperature heating device is used for heating in the single-stage heating mode, and if the judgment result is no, heating is carried out according to a multi-stack heating mode, wherein in the multi-stack heating mode, the low-temperature heating device is used for heating firstly, and then the high-temperature heating device is used for heating.
Preferably, the low-temperature heating apparatus includes a first heating path and a second heating path; when the single-stage heating mode is adopted, a first heating passage in the low-temperature heating device is started, and the high-temperature heating device is closed, so that heat exchange is carried out on an external substance to be heated through the first heating passage; when the cascade heating mode is used, a second heating path and a high-temperature heating device in the low-temperature heating device are started, so that the high-temperature heating device exchanges heat with the second heating path, and an external substance to be heated exchanges heat with the high-temperature heating device.
Preferably, the external substance to be heated exchanges heat with the high-temperature heating device and the first heating passage through a heat exchange device, respectively, wherein the heat exchange device comprises a first heat exchange passage and a second heat exchange passage; when the single-stage heating mode is adopted, the first heat exchange passage and the first heating passage are communicated, so that an external substance to be heated exchanges heat with the first heating passage through the first heat exchange passage; when the cascade heating mode is adopted, the second heat exchange passage and the high-temperature heating device are conducted, so that the external substance to be heated exchanges heat with the high-temperature heating device through the second heat exchange passage.
Preferably, in the cascade heating mode, the output temperature of the low-temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
The invention also provides a cascade heating controller based on refrigerant exchange, which comprises an ambient temperature acquisition module, a cascade heating module and a control module, wherein the ambient temperature acquisition module is used for acquiring ambient temperature; the heating set temperature acquisition module is used for acquiring heating set temperature; the temperature difference calculation module is used for calculating the temperature difference between the heating set temperature and the ambient temperature; the judging module is used for judging whether the heating set temperature is smaller than a preset heating temperature and whether the temperature difference value is smaller than a preset temperature difference value; the heating control module is used for heating according to a single-stage heating mode when the judging module judges that the heating set temperature is smaller than the preset heating temperature and the temperature difference value is smaller than the preset temperature difference value, or heating according to a cascade heating mode, wherein the single-stage heating mode is used for heating by a low-temperature heating device, and the cascade heating mode is used for heating by the low-temperature heating device firstly and then by a high-temperature heating device.
Preferably, the heating control module includes a heating control unit for controlling states of the low-temperature heating device and the high-temperature heating device, the low-temperature heating device includes a first heating path and a second heating path, and when in the single-stage heating mode, the heating control unit starts the first heating path in the low-temperature heating device and closes the high-temperature heating device to allow an external substance to be heated to exchange heat through the first heating path; when the cascade heating mode is used, the heating control unit starts a second heating path and a high-temperature heating device in the low-temperature heating device, so that the high-temperature heating device exchanges heat with the second heating path, and an external substance to be heated exchanges heat with the high-temperature heating device.
Preferably, the heating control module further comprises a heat exchange control unit, the heat exchange control unit is used for controlling the state of a heat exchange device, the heat exchange device comprises a first heat exchange passage and a second heat exchange passage, when in the single-stage heating mode, the heat exchange control unit conducts the first heat exchange passage and the first heating passage to exchange heat between an external substance to be heated and the first heating passage through the first heat exchange passage; when the cascade heating mode is in operation, the heat exchange control unit conducts the second heat exchange path and the high-temperature heating device to exchange heat between the external substance to be heated and the high-temperature heating device through the second heat exchange path.
Preferably, the heating control module further includes an output temperature control unit, and the output temperature control unit is configured to control an output temperature of a low-temperature heating apparatus, so that the output temperature of the low-temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
The invention also provides a refrigerant exchange cascade-based heating system, which comprises a low-temperature heating device, a high-temperature heating device, a heat exchange device and the refrigerant exchange cascade-based heating controller; the low-temperature heating device comprises a low-temperature evaporator, a first low-temperature condenser, a second low-temperature condenser, a low-temperature compressor, a first three-way valve and a low-temperature throttle valve, wherein one end of the low-temperature evaporator is connected with the input end of the first three-way valve through the low-temperature compressor, the first output end of the first three-way valve is connected with the other end of the low-temperature evaporator through the first low-temperature condenser and the low-temperature throttle valve in sequence to form a first heating passage, and the second output end of the first three-way valve is connected with the other end of the low-temperature evaporator through the second low-temperature condenser and the low-temperature throttle valve in sequence to form a second heating passage; the high-temperature heating device comprises a high-temperature evaporator, a high-temperature condenser, a high-temperature compressor and a high-temperature throttle valve, wherein one end of the high-temperature evaporator is connected with the other end of the high-temperature evaporator sequentially through the high-temperature compressor, the high-temperature condenser and the high-temperature throttle valve; the heat exchange device comprises a conveying unit, a second three-way valve, a first heat exchange unit and a second heat exchange unit, the conveying unit is connected with the first heat exchange unit through the second three-way valve to form a first heat exchange passage, and the conveying unit is connected with the second heat exchange unit through the second three-way valve to form a second heat exchange passage.
Preferably, the first low-temperature condenser and the first heat exchange unit form a first plate heat exchanger; the second low-temperature condenser and the high-temperature evaporator form a second plate heat exchanger; and the high-temperature condenser and the second heat exchange unit form a third plate heat exchanger.
The beneficial effects of the implementation of the invention are as follows:
according to the invention, the environment temperature and the heating set temperature are obtained, the temperature difference between the heating set temperature and the environment temperature is calculated, whether the heating set temperature is smaller than the preset heating temperature or not and whether the temperature difference is smaller than the preset temperature difference or not are judged, if yes, the low-temperature heating device is used for heating, and otherwise, the low-temperature heating device is used for heating firstly and then the high-temperature heating device is used for heating. The invention can improve the heating capacity under the condition of low temperature, reduce the energy consumption and improve the utilization rate of energy.
Drawings
Fig. 1 is a schematic flow chart of a refrigerant exchange cascade-based heat control method according to the present invention;
fig. 2 is a schematic block diagram of a refrigerant exchange cascade-based heating controller according to the present invention;
FIG. 3 is a functional block diagram of a heating control module provided by the present invention;
fig. 4 is a schematic block diagram of a refrigerant exchange cascade-based heating system provided by the invention;
fig. 5 is a schematic view of a low-temperature heating apparatus and a high-temperature heating apparatus provided in the present invention;
FIG. 6 is a schematic view of a heat exchange apparatus provided by the present invention;
fig. 7 is another schematic block diagram of a refrigerant exchange cascade-based heating system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.
As shown in fig. 1, the present invention provides a method for controlling heating based on refrigerant exchange cascade, comprising:
s101, acquiring an environment temperature and a heating set temperature;
s102, calculating a temperature difference value between the heating set temperature and the ambient temperature;
s103, judging whether the heating set temperature is smaller than a preset heating temperature and whether the temperature difference is smaller than a preset temperature difference;
s104, when the judgment result is yes, heating is carried out according to a single-stage heating mode, wherein a low-temperature heating device is used for heating in the single-stage heating mode,
and S105, if the judgment result is no, heating according to a cascade heating mode, wherein in the cascade heating mode, heating is firstly carried out through a low-temperature heating device, and then heating is carried out through a high-temperature heating device.
According to the invention, the environment temperature and the heating set temperature are obtained, the temperature difference between the heating set temperature and the environment temperature is calculated, whether the heating set temperature is smaller than the preset heating temperature or not and whether the temperature difference is smaller than the preset temperature difference or not are judged, if yes, the low-temperature heating device is used for heating, and otherwise, the low-temperature heating device is used for heating firstly and then the high-temperature heating device is used for heating. The invention can improve the heating capacity under the condition of low temperature, reduce the energy consumption and improve the utilization rate of energy.
It should be noted that, preferably, the preset heating temperature is 50 ℃, and the preset temperature difference is 60 ℃, but not limited thereto.
Preferably, the low-temperature heating apparatus includes a first heating path and a second heating path; when the single-stage heating mode is adopted, a first heating passage in the low-temperature heating device is started, and the high-temperature heating device is closed, so that heat exchange is carried out on an external substance to be heated through the first heating passage; when the cascade heating mode is used, a second heating path and a high-temperature heating device in the low-temperature heating device are started, so that the high-temperature heating device exchanges heat with the second heating path, and an external substance to be heated exchanges heat with the high-temperature heating device.
In this embodiment, when the single-stage heating mode is used, the low-temperature compressor is in an operating state, the high-temperature compressor is in a closed state, the low-temperature compressor is communicated with the first low-temperature condenser through the first three-way valve, and an external substance to be heated exchanges heat with the first low-temperature condenser; when the cascade heating mode is adopted, the low-temperature compressor and the high-temperature compressor are both in working states, the low-temperature compressor is communicated with the second low-temperature condenser through the first three-way valve, the high-temperature evaporator exchanges heat with the second low-temperature condenser, and an external substance to be heated exchanges heat with the high-temperature condenser. Therefore, this embodiment is through first three-way valve is under the mode of heating of difference, with low temperature compressor and corresponding low temperature condenser intercommunication to can make low temperature compression system in time change different modes of heating, improve the efficiency of heating, and then reduce the energy consumption, improve the utilization ratio of the energy.
Preferably, the external substance to be heated exchanges heat with the high-temperature heating device and the first heating passage through a heat exchange device, wherein the heat exchange device comprises a first heat exchange passage and a second heat exchange passage; when the single-stage heating mode is adopted, the first heat exchange passage and the first heating passage are communicated, so that an external substance to be heated exchanges heat with the first heating passage through the first heat exchange passage; when the cascade heating mode is adopted, the second heat exchange passage and the high-temperature heating device are conducted, so that the external substance to be heated exchanges heat with the high-temperature heating device through the second heat exchange passage.
In this embodiment, when the single-stage heating mode is used, the carrying unit is communicated with the first heat exchange unit through the second three-way valve, the external substance to be heated is carried to the first heat exchange unit through the carrying unit, and the external substance to be heated exchanges heat with the first low-temperature condenser through the first heat exchange unit; when the cascade heating mode is in use, the conveying unit is communicated with the second heat exchange unit through the second three-way valve, the external substance to be heated is conveyed to the second heat exchange unit through the conveying unit, and the external substance to be heated exchanges heat with the high-temperature condenser through the second heat exchange unit. Therefore, this embodiment is through the second three-way valve will transport unit and corresponding heat transfer unit intercommunication under the mode of heating of difference to carry out corresponding heat transfer, with heat transfer efficiency who improves heat transfer device, reach the purpose of energy saving.
Preferably, in the cascade heating mode, the output temperature of the low-temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
In the present embodiment, in order to further improve the heating capacity under the low temperature condition, in the cascade heating mode, the output temperature of the low temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And preferably, the system compensation temperature A is 5 ℃. For example: if the ambient temperature T1-20 deg.C, the heating set temperature T2+60 ℃, the output temperature T of the low-temperature heating device3When the output temperature of the low-temperature heating device is too high, the heating capacity of the low-temperature heating device is reduced, and when the output temperature of the low-temperature heating device is too low, the heating capacity of the high-temperature heating device is reduced.
As shown in fig. 2, the present invention further provides a cascade heating controller 1 based on refrigerant exchange, which includes an ambient temperature obtaining module 11 for obtaining an ambient temperature; a heating set temperature obtaining module 12, configured to obtain a heating set temperature; a temperature difference calculation module 13, configured to calculate a temperature difference between the heating setting temperature and an ambient temperature; the judging module 14 is configured to judge whether the heating setting temperature is less than a preset heating temperature and whether the temperature difference is less than a preset temperature difference; and the heating control module 15 is configured to heat according to a single-stage heating mode when the judging module judges that the heating set temperature is smaller than the preset heating temperature and the temperature difference value is smaller than the preset temperature difference value, or heat according to a cascade heating mode, wherein the single-stage heating mode heats by a low-temperature heating device, and the cascade heating mode heats by the low-temperature heating device and then heats by a high-temperature heating device.
According to the invention, the ambient temperature is obtained by the ambient temperature obtaining module 11; the heating set temperature is acquired through the heating set temperature acquisition module 12; calculating the temperature difference between the heating set temperature and the ambient temperature through the temperature difference calculation module 13; judging whether the heating set temperature is smaller than a preset heating temperature and whether the temperature difference is smaller than a preset temperature difference through the judging module 14; through heating control module 15, work as the judge module judges that the heating settlement temperature is less than predetermineeing the heating temperature just when the temperature difference is less than predetermineeing the temperature difference, heats according to single-stage heating mode, otherwise heats according to the overlapping heating mode, wherein, heat by low temperature heating device in the single-stage heating mode, heat through low temperature heating device earlier in the overlapping heating mode, rethread high temperature heating device heats. The invention can improve the heating capacity under the condition of low temperature, reduce the energy consumption and improve the utilization rate of energy.
As shown in fig. 3, it is preferable that the heating control module 15 includes a heating control unit 151, the heating control unit 151 is configured to control states of the low-temperature heating device and the high-temperature heating device, the low-temperature heating device includes a first heating path and a second heating path, and when the single-stage heating mode is performed, the heating control unit 151 activates the first heating path in the low-temperature heating device and deactivates the high-temperature heating device, so that the external material to be heated exchanges heat through the first heating path; when in the cascade heating mode, the heating control unit 151 activates a second heating path and a high-temperature heating device of the low-temperature heating device so that the high-temperature heating device exchanges heat with the second heating path and an external substance to be heated exchanges heat with the high-temperature heating device.
In this embodiment, the heating control unit 151 controls the states of the low-temperature heating apparatus and the high-temperature heating apparatus, the low-temperature heating apparatus includes a first heating path and a second heating path, and when in the single-stage heating mode, the heating control unit 151 activates the first heating path in the low-temperature heating apparatus and deactivates the high-temperature heating apparatus to allow an external material to be heated to exchange heat through the first heating path; when in the cascade heating mode, the heating control unit 151 activates a second heating path and a high-temperature heating device of the low-temperature heating device so that the high-temperature heating device exchanges heat with the second heating path and an external substance to be heated exchanges heat with the high-temperature heating device. Therefore, different heating passages of the low-temperature compression system can be replaced in time, the heating efficiency is improved, the energy consumption is reduced, and the utilization rate of energy is improved.
Further, the heating control module 15 further includes a heat exchange control unit 152, the heat exchange control unit 152 is configured to control a state of the heat exchange device 4, the heat exchange device 4 includes a first heat exchange path and a second heat exchange path, wherein when in the single-stage heating mode, the heat exchange control unit 152 conducts the first heat exchange path and the first heating path to exchange heat between an external substance to be heated and the first heating path through the first heat exchange path; when in the cascade heating mode, the heat exchange control unit 152 conducts the second heat exchange path and the high temperature heating apparatus to exchange heat between the external substance to be heated and the high temperature heating apparatus through the second heat exchange path.
In this embodiment, the heat exchange control unit 152 controls the state of the heat exchange device 4, the heat exchange device 4 includes a first heat exchange path and a second heat exchange path, and when in the single-stage heating mode, the heat exchange control unit 152 conducts the first heat exchange path and the first heating path to exchange heat between the external substance to be heated and the first heating path through the first heat exchange path; when in the cascade heating mode, the heat exchange control unit 152 conducts the second heat exchange path and the high temperature heating apparatus to exchange heat between the external substance to be heated and the high temperature heating apparatus through the second heat exchange path. Thereby carrying out corresponding heat exchange to improve heat exchange efficiency of the heat exchange device and achieve the purpose of saving energy.
More preferably, the heating control module further includes an output temperature control unit 153, and the output temperature control unit 153 is configured to control the output temperature of the low-temperature heating apparatus, so that the output temperature of the low-temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
In the present embodiment, in order to further improve the heating capacity under the low temperature condition, in the cascade heating mode, the output temperature of the low temperature heating apparatus satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And preferably, the system compensation temperature A is 5 ℃. For example: if the ambient temperature T1-20 deg.C, the heating set temperature T2+60 ℃, the output temperature T of the low-temperature heating device3When the output temperature of the low-temperature heating device is too high, the heating capacity of the low-temperature heating device is reduced, and when the output temperature of the low-temperature heating device is too low, the heating capacity of the high-temperature heating device is reduced.
As shown in fig. 4 to 6, the present invention further provides a system for heating based on refrigerant exchange cascade, which includes a low temperature heating device 2, a high temperature heating device 3, a heat exchange device 4 and the controller 1 for heating based on refrigerant exchange cascade; the low-temperature heating device 2 comprises a low-temperature evaporator 21, a first low-temperature condenser 22, a second low-temperature condenser 23, a low-temperature compressor 24, a first three-way valve 25 and a low-temperature throttle valve 26, wherein one end of the low-temperature evaporator 21 is connected with the input end of the first three-way valve 25 through the low-temperature compressor 24, the first output end of the first three-way valve 25 is connected with the other end of the low-temperature evaporator 21 sequentially through the first low-temperature condenser 22 and the low-temperature throttle valve 26 to form a first heating passage, and the second output end of the first three-way valve 25 is connected with the other end of the low-temperature evaporator 21 sequentially through the second low-temperature condenser 23 and the low-temperature throttle valve 26 to form a second heating passage; the high-temperature heating device 3 comprises a high-temperature evaporator 31, a high-temperature condenser 32, a high-temperature compressor 33 and a high-temperature throttle valve 34, wherein one end of the high-temperature evaporator 31 is connected with the other end of the high-temperature evaporator 31 sequentially through the high-temperature compressor 33, the high-temperature condenser 32 and the high-temperature throttle valve 34; the heat exchanging device 4 includes a carrying unit 41, a second three-way valve 42, a first heat exchanging unit 43, and a second heat exchanging unit 44, the carrying unit 41 is connected with the first heat exchanging unit 43 through the second three-way valve 42 to form a first heat exchanging path, and the carrying unit 41 is connected with the second heat exchanging unit 44 through the second three-way valve 42 to form a second heat exchanging path.
According to the invention, the ambient temperature is obtained by the ambient temperature obtaining module 11; the heating set temperature is acquired through the heating set temperature acquisition module 12; calculating the temperature difference between the heating set temperature and the ambient temperature through the temperature difference calculation module 13; judging whether the heating set temperature is smaller than a preset heating temperature and whether the temperature difference is smaller than a preset temperature difference through the judging module 14; through the heating control module 15, when the judging module judges that the heating set temperature is less than the preset heating temperature and the temperature difference is less than the preset temperature difference, heating is carried out according to a single-stage heating mode, otherwise, heating is carried out according to a cascade heating mode,the single-stage heating mode is characterized in that a low-temperature heating device is used for heating, and the overlapping heating mode is characterized in that the low-temperature heating device is used for heating firstly and then the high-temperature heating device is used for heating. The invention can improve the heating capacity under the condition of low temperature, reduce the energy consumption and improve the utilization rate of energy. In this embodiment, the heating control unit 151 controls the states of the low-temperature heating apparatus and the high-temperature heating apparatus, the low-temperature heating apparatus includes a first heating path and a second heating path, and when in the single-stage heating mode, the heating control unit 151 activates the first heating path in the low-temperature heating apparatus and deactivates the high-temperature heating apparatus to allow an external material to be heated to exchange heat through the first heating path; when in the cascade heating mode, the heating control unit 151 activates a second heating path and a high-temperature heating device of the low-temperature heating device so that the high-temperature heating device exchanges heat with the second heating path and an external substance to be heated exchanges heat with the high-temperature heating device. Therefore, different heating passages of the low-temperature compression system can be replaced in time, the heating efficiency is improved, the energy consumption is reduced, and the utilization rate of energy is improved. In this embodiment, the heat exchange control unit 152 controls the state of the heat exchange device 4, the heat exchange device 4 includes a first heat exchange path and a second heat exchange path, and when in the single-stage heating mode, the heat exchange control unit 152 conducts the first heat exchange path and the first heating path to exchange heat between the external substance to be heated and the first heating path through the first heat exchange path; when in the cascade heating mode, the heat exchange control unit 152 conducts the second heat exchange path and the high temperature heating apparatus to exchange heat between the external substance to be heated and the high temperature heating apparatus through the second heat exchange path. Thereby carrying out corresponding heat exchange to improve heat exchange efficiency of the heat exchange device and achieve the purpose of saving energy. In the present embodiment, in order to further improve the heating capacity under the low temperature condition, in the cascade heating mode, the output temperature of the low temperature heating apparatus satisfies:T3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And preferably, the system compensation temperature A is 5 ℃. For example: if the ambient temperature T1-20 deg.C, the heating set temperature T2+60 ℃, the output temperature T of the low-temperature heating device3When the output temperature of the low-temperature heating device is too high, the heating capacity of the low-temperature heating device is reduced, and when the output temperature of the low-temperature heating device is too low, the heating capacity of the high-temperature heating device is reduced.
Preferably, the first low-temperature condenser and the first heat exchange unit form a first plate heat exchanger; the second low-temperature condenser and the high-temperature evaporator form a second plate heat exchanger; and the high-temperature condenser and the second heat exchange unit form a third plate heat exchanger.
In this embodiment, the condensing, evaporating and heat exchanging elements in the multiple heating device all adopt a plate heat exchanger structure, wherein: the first low-temperature condenser and the first heat exchange unit form a first plate heat exchanger; the second low-temperature condenser and the high-temperature evaporator form a second plate heat exchanger; and the high-temperature condenser and the second heat exchange unit form a third plate heat exchanger. Through plate heat exchanger, can carry out abundant transfer to the heat, improve thermal conversion efficiency.
As shown in fig. 7, which is a schematic view of another embodiment of a refrigerant exchange cascade-based heating system provided in the present invention, in this embodiment, the first three-way valve is composed of an electromagnetic valve 1 and an electromagnetic valve 2, and a cooling and defrosting function is added on the basis of heating;
when the system is in a single-stage heating mode, the electromagnetic valve 1 is disconnected, the electromagnetic valve 2 is opened, and when the system is in a cascade heating mode, the electromagnetic valve 1 is opened, and the electromagnetic valve 2 is disconnected;
when the system is in a refrigeration mode, the electromagnetic valve 1 is disconnected, the electromagnetic valve 2 is opened, the direct-current variable-frequency compressor (low-temperature system for short) is started, and the fixed-frequency compressor (high-temperature system for short) is not started;
when the system is in a defrosting mode, only the low-temperature system is started, the high-temperature system is not started, the electromagnetic valve 2 is opened, the electromagnetic valve 1 is disconnected, and the four-way valve is switched.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A heating control method based on refrigerant exchange cascade is characterized by comprising the following steps:
acquiring an ambient temperature and a heating set temperature;
calculating the temperature difference between the heating set temperature and the ambient temperature;
judging whether the heating set temperature is smaller than a preset heating temperature or not and whether the temperature difference is smaller than a preset temperature difference or not;
if so, heating according to a single-stage heating mode, wherein a low-temperature heating device heats in the single-stage heating mode,
and if not, heating according to a cascade heating mode, wherein in the cascade heating mode, heating is firstly carried out through a low-temperature heating device, and then heating is carried out through a high-temperature heating device.
2. The method of claim 1, wherein the low-temperature heating apparatus includes a first heating path and a second heating path;
when the single-stage heating mode is adopted, a first heating passage in the low-temperature heating device is started, and the high-temperature heating device is closed, so that heat exchange is carried out on an external substance to be heated through the first heating passage;
when the cascade heating mode is used, a second heating path and a high-temperature heating device in the low-temperature heating device are started, so that the high-temperature heating device exchanges heat with the second heating path, and an external substance to be heated exchanges heat with the high-temperature heating device.
3. The refrigerant exchange cascade heating control method according to claim 2, wherein an external substance to be heated exchanges heat with the high-temperature heating device and the first heating passage through a heat exchange device, respectively, wherein the heat exchange device includes a first heat exchange passage and a second heat exchange passage;
when the single-stage heating mode is adopted, the first heat exchange passage and the first heating passage are communicated, so that an external substance to be heated exchanges heat with the first heating passage through the first heat exchange passage;
when the cascade heating mode is adopted, the second heat exchange passage and the high-temperature heating device are conducted, so that the external substance to be heated exchanges heat with the high-temperature heating device through the second heat exchange passage.
4. The method for controlling heating based on refrigerant exchange cascade of any one of claims 1 to 3,
in the cascade heating mode, the output temperature of the low-temperature heating device satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
5. A cascade heating controller based on refrigerant exchange is characterized by comprising:
the environment temperature acquisition module is used for acquiring environment temperature;
the heating set temperature acquisition module is used for acquiring heating set temperature;
the temperature difference calculation module is used for calculating the temperature difference between the heating set temperature and the ambient temperature;
the judging module is used for judging whether the heating set temperature is smaller than a preset heating temperature and whether the temperature difference value is smaller than a preset temperature difference value;
the heating control module is used for heating according to a single-stage heating mode when the judging module judges that the heating set temperature is smaller than the preset heating temperature and the temperature difference value is smaller than the preset temperature difference value, or heating according to a cascade heating mode, wherein the single-stage heating mode is used for heating by a low-temperature heating device, and the cascade heating mode is used for heating by the low-temperature heating device firstly and then by a high-temperature heating device.
6. The refrigerant-exchange cascade-based heating controller of claim 5, wherein the heating control module comprises a heating control unit for controlling states of the low-temperature heating device and the high-temperature heating device, the low-temperature heating device comprises a first heating path and a second heating path, wherein,
when in the single-stage heating mode, the heating control unit starts a first heating passage in the low-temperature heating device and closes the high-temperature heating device, so that an external substance to be heated exchanges heat through the first heating passage;
when the cascade heating mode is used, the heating control unit starts a second heating path and a high-temperature heating device in the low-temperature heating device, so that the high-temperature heating device exchanges heat with the second heating path, and an external substance to be heated exchanges heat with the high-temperature heating device.
7. The refrigerant-exchange cascade heating controller of claim 6, wherein the heating control module further comprises a heat exchange control unit for controlling a state of a heat exchange device comprising a first heat exchange path and a second heat exchange path, wherein,
when the single-stage heating mode is adopted, the heat exchange control unit conducts the first heat exchange passage and the first heating passage so as to exchange heat between an external substance to be heated and the first heating passage through the first heat exchange passage;
when the cascade heating mode is in operation, the heat exchange control unit conducts the second heat exchange path and the high-temperature heating device to exchange heat between the external substance to be heated and the high-temperature heating device through the second heat exchange path.
8. The refrigerant-exchange-based cascade heating controller according to any one of claims 5 to 7, wherein the heating control module further comprises an output temperature control unit, and the output temperature control unit is configured to control an output temperature of a low-temperature heating device so that the output temperature of the low-temperature heating device satisfies: t is3＝(T1+T2) A 2+ A, wherein T3Is the output temperature, T, of the low-temperature heating device1Is the ambient temperature, T2And setting the temperature for heating, wherein A is the system compensation temperature.
9. A refrigerant exchange cascade-based heating system is characterized by comprising a low-temperature heating device, a high-temperature heating device, a heat exchange device and a refrigerant exchange cascade-based heating controller according to any one of claims 5 to 8;
the low-temperature heating device comprises a low-temperature evaporator, a first low-temperature condenser, a second low-temperature condenser, a low-temperature compressor, a first three-way valve and a low-temperature throttle valve, wherein one end of the low-temperature evaporator is connected with the input end of the first three-way valve through the low-temperature compressor, the first output end of the first three-way valve is connected with the other end of the low-temperature evaporator through the first low-temperature condenser and the low-temperature throttle valve in sequence to form a first heating passage, and the second output end of the first three-way valve is connected with the other end of the low-temperature evaporator through the second low-temperature condenser and the low-temperature throttle valve in sequence to form a second heating passage;
the high-temperature heating device comprises a high-temperature evaporator, a high-temperature condenser, a high-temperature compressor and a high-temperature throttle valve, wherein one end of the high-temperature evaporator is connected with the other end of the high-temperature evaporator sequentially through the high-temperature compressor, the high-temperature condenser and the high-temperature throttle valve;
the heat exchange device comprises a conveying unit, a second three-way valve, a first heat exchange unit and a second heat exchange unit, the conveying unit is connected with the first heat exchange unit through the second three-way valve to form a first heat exchange passage, and the conveying unit is connected with the second heat exchange unit through the second three-way valve to form a second heat exchange passage.
10. The refrigerant-exchange cascade heating system of claim 9,
the first low-temperature condenser and the first heat exchange unit form a first plate heat exchanger;
the second low-temperature condenser and the high-temperature evaporator form a second plate heat exchanger;
and the high-temperature condenser and the second heat exchange unit form a third plate heat exchanger.
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