CN113294900A - Multifunctional variable-rated-power-end variable-frequency heat pump system and operation method - Google Patents

Multifunctional variable-rated-power-end variable-frequency heat pump system and operation method Download PDF

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Publication number
CN113294900A
CN113294900A CN202011050381.6A CN202011050381A CN113294900A CN 113294900 A CN113294900 A CN 113294900A CN 202011050381 A CN202011050381 A CN 202011050381A CN 113294900 A CN113294900 A CN 113294900A
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refrigerant
unit
reheating
dehumidification
heat
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龚长山
王伟华
陈娟
吴家祥
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Nanjing Sanni Electric Equipment Co ltd
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Nanjing Sanni Electric Equipment Co ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D17/00—Domestic hot-water supply systems
    • F24D17/02—Domestic hot-water supply systems using heat pumps
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H4/00—Fluid heaters characterised by the use of heat pumps
    • F24H4/02—Water heaters
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to a multifunctional variable-frequency heat pump system with variable rated power at the tail end and an operation method thereof. The invention can carry out multi-mode operation through a set of variable-frequency heat pump system, automatically adjusts the rated output power of each indoor air conditioner terminal under different operation modes, so that the variable-frequency heat pump system is suitable for various operation modes, and ensures that the sum of the rated output powers of each indoor machine does not exceed the rated output power allowed by the outdoor host machine on the premise of not increasing the rated output power of the outdoor host machine.

Description

Multifunctional variable-rated-power-end variable-frequency heat pump system and operation method
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a multifunctional variable-rated-power-end variable-frequency heat pump system and an operation method.
Background
At present, widely applied air conditioning systems in the household central air conditioning market mainly comprise a variable-frequency multi-connected central air conditioning system, an air source heat pump floor heating central air conditioning system and a radiation refrigeration heating and dehumidification fresh air triple constant (constant temperature, constant humidity and constant oxygen) air conditioning system adopting a temperature and humidity independent control technology. Various systems have different advantages and disadvantages, and have suitable application scenes and environments, different central air-conditioning types, different forms of tail end output energy, cold and hot water output, cold and hot air output and condensation and dehumidification output. Particularly, the triple constant air conditioning system needs cold and hot water for a radiation system, and also needs to condense, dehumidify and reheat fresh air entering a room for temperature rise. The energy required by various types of air conditioners and the same type of air conditioning system in different operation modes is different for various indoor terminals.
The rated output power of the indoor end of the central air conditioner in the prior art is a fixed value, and cannot be adjusted in different ends, and the actually output energy can only be adjusted within the range of the rated power. For the frequency conversion central air conditioner with the indoor unit directly exchanging heat with the refrigerant, the rated output power of the outdoor main machine is consistent with the total rated output power of the indoor unit, the ratio of the total rated output power of the indoor unit to the total rated output power of the outdoor unit needs to be within the super-proportioning range (generally less than or equal to 1.3) of the product design, and the unit can stably run. Therefore, the existing central air conditioning technology can not only refrigerate and heat in a frequency conversion multi-split air conditioner running mode, but also convert the frequency conversion multi-split air conditioner into a three-constant (constant temperature, constant humidity and constant oxygen) mode to run on the premise of not changing the rated output power of an outdoor host, and can also provide domestic hot water all the year round.
In addition, the indoor dehumidification reheating air conditioner can realize that an indoor unit of an indoor dehumidification reheating air conditioner performs secondary circulation dehumidification in a single dehumidification mode that the existing three-constant (constant temperature, constant humidity and constant oxygen) air conditioning system only has fresh air dehumidification, and solves the problem that doors and windows cannot be opened when the existing three-constant (constant temperature, constant humidity and constant oxygen) system operates so as to prevent condensation and frosting caused by the fact that outdoor un-dehumidified air directly enters the room. If directly get into indoorly because of outdoor humid air to and because of the fresh air dehumidification effect is not good or cause indoor humidity to exceed control range because of various reasons in the indoor short time, the operation of dehumidification and reheat will be carried out automatically to the interior machine of dehumidification reheat air conditioner in the indoor relevant space, ensure that indoor humidity is in the within range that needs the control, thereby ensure that the radiant surface does not condense dew and milden and rot.
Disclosure of Invention
The invention aims to provide a multifunctional variable-frequency heat pump system with variable rated power at the tail end and an operation method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as one aspect of the invention, the invention provides a multifunctional variable-rated-power variable-frequency heat pump system, which comprises an outdoor unit, a radiation system cold and hot water heat exchange unit connected with the outdoor unit, a fresh air dehumidification reheating unit, a dehumidification reheating air conditioner internal unit and a domestic hot water heat exchange unit, wherein the fresh air dehumidification reheating unit is connected with the indoor unit;
high-temperature and high-pressure refrigerants of the outdoor unit flow through the domestic hot water heat exchange unit to be condensed and released after passing through the second refrigerant main pipe, heat is transmitted to domestic hot water flowing through the heat exchange unit to heat the domestic hot water, and the condensed and released refrigerants enter the first refrigerant main pipe;
after passing through the second refrigerant main pipe, the high-temperature and high-pressure refrigerant of the outdoor unit can flow through the reheating heat exchanger of the fresh air dehumidifying and reheating unit to be condensed and released, heat is transmitted to the dehumidified and cooled fresh air to be reheated, and the condensed and released refrigerant flows into the first refrigerant main pipe;
after passing through the second refrigerant main pipe, a high-temperature and high-pressure refrigerant of the outdoor unit can flow through the dehumidification and reheating air conditioner internal unit as required, the dehumidified air is reheated and heated, and the refrigerant after condensation and heat release flows into the first refrigerant main pipe;
the refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger of the fresh air dehumidification reheating unit, and the refrigerant after evaporation and heat absorption flows into the air suction port of the outdoor unit compressor through the fourth refrigerant main pipe;
one end pipeline of the cold and hot water heat exchange unit of the radiation system is connected with a first refrigerant main pipe, and the other end pipeline of the cold and hot water heat exchange unit of the radiation system is connected with an outdoor unit through a third refrigerant main pipe;
and under the condition that the rated output power of the outdoor unit is not changed, the multifunctional tail end output unit performs allocation control of different rated output powers in different operation modes.
As another aspect of the present invention, there is provided an operation method of a multifunctional variable-power-rating-at-end variable-frequency heat pump system, comprising the steps of:
(1) when the operation mode is an air-conditioning refrigeration mode, a fresh air dehumidification mode, a fresh air reheating mode and a domestic hot water mode:
the outdoor unit works, and a high-temperature and high-pressure refrigerant passes through the end A of the four-way valve, flows through the end D, enters the outdoor air-side heat exchanger, is condensed and releases heat, and then enters the first refrigerant main pipe; and the other path of refrigerant enters a second refrigerant main pipe.
One path of refrigerant in the second refrigerant main pipe passes through a reheating heat exchanger in the fresh air dehumidification reheating unit to reheat the cooled and dehumidified fresh air, the other path of refrigerant passes through the domestic hot water heat exchange unit to be condensed and released to heat domestic hot water passing through the domestic hot water heat exchange unit, and the condensed and released refrigerant enters the first refrigerant main pipe;
the refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger in the fresh air dehumidification reheating unit to be throttled, evaporated and heat absorbed, the fresh air flowing through the dehumidification heat exchanger is cooled and dehumidified, and the refrigerant after evaporation and heat absorption flows into a compressor air suction port of the outdoor unit through the fourth refrigerant main pipe;
the refrigerant in the first refrigerant main pipe can respectively flow into an air conditioner indoor unit needing to be refrigerated after being throttled by respective electronic throttling devices, and the space where the air conditioner indoor unit is located is refrigerated under the condition that the rated output power is the rated power gear of the air conditioner refrigeration.
(2) When three constant (constant temperature, constant humidity and constant oxygen) modes are selected for refrigeration (radiation refrigeration, fresh air dehumidification, fresh air reheating and dehumidification)
Dehumidification of the reheat air conditioner indoor unit + reheat of the dehumidification reheat air conditioner indoor unit):
the outdoor unit works, and a high-temperature and high-pressure refrigerant passes through the end A of the four-way valve, flows through the end D, enters the outdoor air-side heat exchanger, is condensed and releases heat, and then enters the first refrigerant main pipe; and the other path of refrigerant enters a second refrigerant main pipe.
One path of refrigerant in the second refrigerant main pipe passes through a reheating heat exchanger in the fresh air dehumidification reheating unit to reheat the cooled and dehumidified fresh air, and the other path of refrigerant passes through the domestic hot water heat exchange unit to be condensed and release heat to heat domestic hot water passing through the domestic hot water heat exchange unit and then enters the first refrigerant main pipe; the third path of refrigerant can respectively flow into a reheating heat exchanger of a dehumidification reheating air conditioner indoor unit needing dehumidification after being throttled by respective electronic throttling devices, and the reheating operation is carried out on the indoor air flowing through the reheating heat exchanger of the air conditioner indoor unit.
The refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger in the fresh air dehumidification reheating unit to be throttled, evaporated and heat absorbed, the fresh air flowing through the dehumidification heat exchanger is cooled and dehumidified, and the refrigerant after evaporation and heat absorption flows into a compressor air suction port of the outdoor unit through the fourth refrigerant main pipe;
the refrigerant in the first refrigerant main pipe can respectively flow into each dehumidification and reheating air conditioner internal unit, an electronic throttling device of each dehumidification and reheating air conditioner internal unit throttles and then flows into a dehumidification air conditioner heat exchanger needing dehumidification operation, and indoor air flowing through the dehumidification air conditioner internal unit is dehumidified under the rated power of a dehumidification gear.
The refrigerant in the first refrigerant main pipe enters the refrigerant heat exchange module of the cold and hot water heat exchange unit of the radiation system under the set low-grade rated output power state to evaporate and absorb heat, and the refrigeration operation is carried out on the high-temperature cold water circulating through the radiation system of the water side heat exchanger of the cold and hot water heat exchange module. The refrigerant after absorbing heat flows through the third refrigerant main pipe, flows through the B end and the C end of the four-way valve and then flows into the air suction port of the outdoor unit compressor.
(3) When the operation mode is a heating, domestic hot water, fresh air dehumidification and fresh air reheating mode, the method comprises the following steps:
the outdoor unit works, and a high-temperature and high-pressure refrigerant enters the second refrigerant main pipe and enters the third refrigerant main pipe after passing through the A end and the B end of the four-way valve;
the refrigerant in the second refrigerant main pipe is condensed and released heat through a reheating heat exchanger in the fresh air dehumidifying and reheating unit and the domestic hot water heat exchange unit respectively and flows into the first refrigerant main pipe;
a. when the air conditioner is in a heating mode, the refrigerant in the third refrigerant main pipe enters the air conditioner heat exchanger of the dehumidification reheating air conditioner internal unit to be condensed and released, the indoor air flowing through the air conditioner heat exchanger is heated, and the condensed and released refrigerant flows into the first refrigerant main pipe. At the moment, the rated output power of the air conditioner indoor unit during heating is 100%, and the cold and hot water heat exchange unit of the radiation system is in a closed working state;
b. and in the radiation heating mode, the refrigerant in the third refrigerant main pipe enters the radiation system cold and hot water heat exchange unit, and exchanges heat with the radiation system circulating hot water flowing through the radiation system cold and hot water heat exchange unit to heat the refrigerant. The refrigerant after condensing and releasing heat flows into the first refrigerant main pipe. At the moment, the air conditioner indoor unit is in a closed working state, and the cold and hot water heat exchange unit of the radiation system is in a 100% working state;
c. when the radiation heating and air-conditioning heating mixed mode is adopted, a part of the refrigerant in the third refrigerant main pipe enters the radiation system cold and hot water heat exchange unit, and the refrigerant exchanges heat with the radiation system circulating hot water flowing through the radiation system cold and hot water heat exchange unit to heat the refrigerant. And the other part of the refrigerant enters an air conditioner heat exchanger of the dehumidification reheating air conditioner internal unit to be condensed and released heat, the indoor air flowing through the cold air conditioner heat exchanger is heated, and the condensed and released heat refrigerant flows into the first refrigerant main pipe. At the moment, the cold and hot water heat exchange unit of the radiation system is in a working state at a low gear, namely a gear less than or equal to 40%, and is in a closed state at a medium gear, namely a gear less than or equal to 60%, or is in a closed state at a low gear, namely a gear less than or equal to 40%, and is in a working state at a medium gear, namely a gear greater than or equal to 60%, and the rated output power of the cold and hot water heat exchange unit of the radiation system which is closed to work is transferred to a part of turned-on air conditioner internal units for heating;
d. in spring and autumn (outdoor temperature is 18-26 ℃), when only the operation modes of domestic hot water, fresh air dehumidification, fresh air reheating and indoor unit reheating are needed, the outdoor unit works, and the high-temperature and high-pressure refrigerant enters the second refrigerant main pipe, and the refrigerant in the second refrigerant main pipe is condensed and released heat through the reheating heat exchanger in the fresh air dehumidification reheating unit, the reheating heat exchanger of the dehumidification reheating air conditioner indoor unit and the domestic hot water heat exchange unit respectively, and flows into the first refrigerant main pipe. At the moment, the reheating rated output power of the reheating heat exchanger in the fresh air dehumidifying and reheating unit is the rated output power of the outdoor host machine which is less than or equal to 15 percent, the reheating rated output power of the reheating heat exchanger of the indoor unit of the dehumidifying and reheating air conditioner is the rated output power of the outdoor host machine which is less than or equal to 50 percent, and the heating rated output power of the domestic hot water heat exchange unit is the rated output power of the outdoor host machine which is less than or equal to 30 percent.
Compared with the prior art, the invention has the beneficial effects that:
the invention is based on a set of units, on the premise of not changing the rated output power of the outdoor host, not only can refrigerate and heat in a frequency conversion multi-split air conditioner running mode, but also can convert the running mode into a three-constant (constant temperature, constant humidity and constant oxygen) mode to run, and can provide domestic hot water all the year round.
The invention adds an indoor dehumidification reheating air conditioner indoor unit to carry out secondary circulation dehumidification, and solves the problem that the existing three constant (constant temperature, constant humidity and constant oxygen) system can not open doors and windows during operation so as to prevent the condensation and frosting phenomenon caused by directly entering outdoor un-dehumidified air into the room.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention. Wherein:
FIG. 1 is a schematic structural diagram of a multifunctional variable-power-rating end variable-frequency heat pump system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another multi-functional variable-power-rating-at-end variable-frequency heat pump system according to an embodiment of the present invention;
FIG. 3 is a flow chart of the operation of the refrigerant in the refrigeration mode combining air-conditioning refrigeration, domestic hot water, fresh air dehumidification and fresh air reheating according to the embodiment of the invention;
FIG. 4 is a flow chart of refrigerant operation in a triple-constant refrigeration mode combining radiation refrigeration, fresh air dehumidification, fresh air reheating, indoor unit dehumidification and indoor unit reheating according to an embodiment of the present invention;
FIG. 5 is a flow chart of the operation of the refrigerant in the combined heating mode of radiation heating, domestic hot water, fresh air dehumidification and fresh air reheating according to the embodiment of the present invention;
FIG. 6 is a flow chart of the operation of the refrigerant in the combined heating mode of air conditioning heating, domestic hot water, fresh air dehumidification and fresh air reheating according to the embodiment of the present invention;
FIG. 7 is a flow chart of the operation of the refrigerant in the combined heating mode of the radiation and air conditioning hybrid heating, domestic hot water, fresh air dehumidification and fresh air reheating according to the embodiment of the present invention;
FIG. 8 is a refrigerant operation flow chart of a combined heating mode of domestic hot water, fresh air dehumidification, fresh air reheating and indoor unit reheating in spring and autumn transition seasons according to the embodiment of the invention;
in the figure: 1-outdoor unit, 11-frequency conversion compressor, 12-four-way valve, 13-outdoor unit air side heat exchanger, 14-stop valve a, 15-stop valve b, 16-stop valve c, 17-stop valve d, 18-electromagnetic valve and 19-electronic throttling device;
2-radiation system cold and hot water heat exchange unit, 21-radiation system cold and hot water refrigerant heat exchange module a, 22-radiation system cold and hot water refrigerant heat exchange module b, 23-cold and hot water heat exchange module water side heat exchanger, 2101-electromagnetic valve a, 2102-electronic throttling device a, 2201-electromagnetic valve b, 2202-electronic throttling device b;
3-domestic hot water heat exchange unit, 31-domestic hot water refrigerant heat exchange module a, 32-domestic hot water refrigerant heat exchange module b, 33-domestic hot water module water side heat exchanger, 34-one-way valve a, 35-electromagnetic valve c, 36-electromagnetic valve d;
4-fresh air dehumidification reheating unit, 41-dehumidification heat exchanger, 42-reheating heat exchanger, 43-one-way valve b, 44-electromagnetic valve e, 45-electronic throttling device e;
5-dehumidification reheating air conditioner internal unit, 51-reheating heat exchanger, 52-dehumidification air conditioner heat exchanger, 53-check valve c, 54-electromagnetic valve f, 55-electromagnetic valve g, 56-electronic throttling device g, 57-electromagnetic valve h, 58-electronic throttling device h.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
In one embodiment of the invention, a stop valve a, a point F, a point N and points O1-On form a second refrigerant main pipe; a first refrigerant main pipe is formed by a stop valve d, a point J, a point L and points M, W, P1-Pn; a third refrigerant main pipe is formed by the stop valve b and the points U1-Un; and a pipeline from the dehumidification heat exchanger 41 of the fresh air dehumidification reheating unit 4 to the stop valve c is a fourth refrigerant main pipe.
The exhaust port of the variable frequency compressor 11 is connected with the A end of the four-way valve 12 and is connected with the second refrigerant main pipe through a stop valve a 14; the B end of the four-way valve 12 is connected with a third refrigerant main pipe through a stop valve B15; the fourth refrigerant main pipe is connected with a suction port of the variable frequency compressor 11 through a stop valve C16, and the C end of the four-way valve 12 is connected with the suction port of the variable frequency compressor 11; the D end of the four-way valve 12 is connected to the first refrigerant main pipe through the outdoor unit air side heat exchanger 13 and the cutoff valve D17.
Fig. 1 and fig. 2 show schematic structural diagrams of a multifunctional variable-power-rating-end variable-frequency heat pump system according to an embodiment of the present invention, which includes an outdoor unit 1, a cold and hot water heat exchange unit 2 of a radiation system connected to the outdoor unit 1, a fresh air dehumidification reheating unit 4, an indoor unit 5 of a dehumidification reheating air conditioner, and a domestic hot water heat exchange unit 3.
Specifically, the high temperature high pressure refrigerant of off-premises station unit gets into the second refrigerant through stop valve a14 and is responsible for, it is exothermic to input new trend dehumidification reheat unit 4 respectively, the heat transmits the new trend after the dehumidification cooling for, input dehumidification reheat air conditioner internal 5's reheat heat exchanger 51, can reheat the intensification to the air after the dehumidification cooling of dehumidification reheat air conditioner internal 5, it is exothermic to input life hot water heat transfer unit 3 to carry out the condensation, the heat transmits the life hot water of this heat transfer unit of flowing through, heat is heated it. The refrigerant after condensation and heat release flows into the first refrigerant main pipe;
the refrigerant in the first refrigerant main pipe flows into the dehumidification heat exchanger 41 of the fresh air dehumidification reheating unit 4 to evaporate and absorb heat, and the refrigerant after evaporation and heat absorption flows into the air suction port of the outdoor unit 1 through the fourth refrigerant main pipe; one pipeline of the cold and hot water heat exchange unit 2 of the radiation system is connected with a first refrigerant main pipe, and the other pipeline is connected with the B end of the four-way valve through a third refrigerant main pipe and a stop valve B15;
meanwhile, the cold and hot water heat exchange unit 2, the domestic hot water heat exchange unit 3 and the dehumidification reheating air conditioner indoor unit 5 of the radiation system perform variable frequency control according to the required power in different rated output powers.
As an embodiment of the present invention, the rated output power of the cold and hot water heat exchange unit 2 of the radiation system is output in three stages, and the technical solution includes but is not limited to the following two types: firstly, in the radiation system cold and hot water heat exchange unit 2, the radiation system cold and hot water heat exchange unit 2 is provided with at least two paths of refrigerant heat exchange modules which are independently controlled, each refrigerant heat exchange module is provided with an electromagnetic valve control system and an electronic throttling device, the working condition of each path of refrigerant heat exchange module is controlled through the electromagnetic valve control system and the electronic throttling device, and the sum of rated output power of the two paths of refrigerant heat exchange modules is equal to 70-100% of the output rated power of the outdoor unit 1. The rated output power configuration of one path of refrigerant heat exchange module is less than or equal to 40% of the total rated output power of the refrigerant heat exchange module, and the rated output power configuration of the other path of refrigerant heat exchange module is greater than or equal to 60% of the total rated output power of the refrigerant heat exchange module. When the two refrigerant heat exchange modules are simultaneously opened, the rated output power of the two refrigerant heat exchange modules is 100% of the total rated output power of the refrigerant heat exchange modules.
Another mode for adjusting rated output power in a stepping mode is that a cold and hot water heat exchange unit of a radiation system is provided with a path of refrigerant heat exchange module, multi-stage rated power output setting is realized through an electronic throttling device on a pipeline according to rated output power of different requirements, such as low-stage radiation cold and hot water, medium-stage radiation cold and hot water and high-stage radiation cold and hot water when the radiation system is fully opened, the rated output power configuration of the low-stage radiation cold and hot water is less than or equal to 40% of the total rated output power of the refrigerant heat exchange module, the rated output power configuration of the medium-stage radiation hot water is more than or equal to 60% of the total rated output power of the refrigerant heat exchange module, and the rated output power of.
When the cold and hot water heat exchange unit 2 of the radiation system operates in a refrigeration mode, the parameter range and control logic characteristics are as follows:
1. the outlet water temperature range of the cold and hot water heat exchange unit 2 unit of the radiation system is set to be 12-28 ℃;
2. when the system operates, the unit water outlet temperature T (water outlet) should preferably meet the following conditions: in all rooms adopting radiation refrigeration indoors, the highest value T (dew point) of the dew point temperature at the corresponding room temperature and relative humidity is added with 2 ℃ of safe temperature difference, and the heat transfer temperature difference T (temperature difference) of the room radiation surface temperature and the unit water outlet temperature is subtracted, namely T (water outlet) is more than or equal to T (dew point) +2 ℃ -T (temperature difference). T (difference in temperature) its numerical value is different when house, the building material of difference are different, and the control system of unit can calculate corresponding dew point temperature according to indoor temperature and relative humidity to when having the corresponding heat transfer difference in the operating personnel input, can calculate the unit temperature of leaving water at that time, control system such as system meeting automatic adjustment electronic throttle device, solenoid valve can make water supply temperature rise gradually or reduce, lets the temperature of radiant face be higher than dew point temperature all the time, ensures that the radiant face can not the condensation.
3. The control system of the unit needs to satisfy a second condition: the water outlet temperature of the unit needs to ensure that the temperature value T (radiation surface) set by the room radiation refrigeration radiation surface set by the indoor and indoor machine panels is between 18 and 25 ℃, and the fluctuation value is +/-1 ℃. When the temperature of the radiation surface exceeds the set range, the system can automatically adjust control systems such as an electronic throttling device, an electromagnetic valve and the like, so that the water supply temperature is gradually increased or decreased until the set range is met.
4. When the radiation refrigeration operation mode is adopted, the control system of the unit also needs to meet another condition: the temperature parameter of the master control room is used as a control target, and when the indoor air temperature is lower than or higher than a set value by 2 ℃ in the master control room, the system can automatically adjust control systems such as an electronic throttling device and an electromagnetic valve, so that the water supply temperature is gradually increased or decreased until the water supply temperature is met.
When the cold and hot water heat exchange unit 2 of the radiation system operates in a heating mode, the parameter range and the control logic characteristics are as follows:
1. the outlet water temperature range of a cold and hot water heat exchange unit of the cold and hot water heat exchange unit 2 of the radiation system is set to be 28-50 ℃;
2. when the system is in operation, the unit outlet water temperature is ensured to reach the set unit outlet water temperature, and the fluctuation value is +/-2 ℃. When the water outlet temperature of the unit exceeds the set range, the system can automatically adjust control systems such as an electronic throttling device, an electromagnetic valve and the like, so that the water supply temperature is gradually increased or decreased until the water supply temperature is met.
3. The system adopts a domestic hot water priority control mode, and when the indoor temperature is lower than a set temperature value and the domestic hot water module runs at a low rated output energy gear, the two refrigerant heat exchange modules simultaneously participate in heat exchange work; when the outlet water temperature of the unit reaches and exceeds the set temperature or the domestic hot water module is in high rated output energy gear operation, the cold and hot water heat exchange unit 2 of the radiation system stops working at a low rated output energy gear, and only the refrigerant heat exchange module at a high rated output energy gear participates in heat exchange work.
When the domestic hot water heat exchange unit 3 runs, the parameter range and the control logic characteristics are as follows:
1. the outlet water temperature range of the domestic hot water heat exchange unit 3 is set to be 38-50 ℃;
2. the domestic hot water heat exchange unit 3 is a two-way refrigerant heat exchange module and exchanges heat with a water side heat exchanger of the same domestic hot water module. When the temperature of the domestic hot water reaches the set temperature, only one path of the domestic hot water works, namely the working state of the low-gear rated output power is obtained; when the temperature of the domestic hot water does not reach the set temperature, the two refrigerant heat exchange modules work simultaneously, namely the working state of high-gear rated output power is obtained. Each path of domestic hot water refrigerant heat exchange module is provided with an independent electromagnetic valve control system, the opening of each path can be controlled according to the change of hot water temperature and the condition of energy demand, and when the path stops working, the rated (heating) output power of the path can be transferred to other tail end output units.
As an embodiment of the present invention, the technology for controlling rated output power of the domestic hot water module in a step-by-step manner also includes the following technical forms: the domestic hot water heat exchange unit 3 is provided with a path of refrigerant heat exchange module, and is controlled in a grading way through a throttling control device, if a low grade of hot water rated power output and a high grade of hot water rated power output are set, the rated output power of hot water can be controlled according to the change of hot water temperature and required energy.
The total rated output power of the domestic hot water heat exchange units 3 is configured according to 20-30% of the rated output power of the outdoor unit, wherein one path of the domestic hot water heat exchange modules or the rated output power of the low grade of the rated output power of hot water is configured according to 10-15% of the rated output power of the outdoor main unit, and the other path of the domestic hot water heat exchange modules or the rated output power of the high grade of the rated output power of hot water is configured according to 10-20% of the rated output power of the outdoor unit.
Fourthly, the operation parameters and the control logic of the fresh air dehumidifying and reheating unit 4 are as follows:
the fresh air dehumidification reheating unit 4 further comprises a dehumidification heat exchanger 41, the refrigerant in the first refrigerant main pipe flows into the dehumidification heat exchanger 41 of the fresh air dehumidification reheating unit 4, and the refrigerant after evaporation and heat absorption flows into an air suction port of the variable frequency compressor 11 through the fourth refrigerant main pipe. The rated dehumidification refrigerating capacity of the fresh air dehumidification reheating unit 4 is configured according to 20-40% of the rated refrigerating capacity of the outdoor host unit, and the rated heating capacity of the reheating heat exchange module 42 is configured according to 10-20% of the rated refrigerating capacity of the outdoor host unit.
The fresh air dehumidification reheating unit 4 is used for controlling the absolute moisture content of the input indoor fresh air humidity within a set range according to 10 +/-1 g/kg of air, the dehumidification heat exchanger 41 operates when the moisture content of the input indoor fresh air is larger than or equal to 11 g/kg of air, and the dehumidification heat exchanger 41 reduces or stops the supply of dehumidification capacity by adjusting the electronic throttling device e45 when the moisture content of the input indoor fresh air is smaller than or equal to 9 g/kg of air. When the temperature of the fresh air in the input chamber is less than or equal to 21 ℃, the reheating heat exchanger 42 operates, and when the temperature of the fresh air in the input chamber is more than or equal to 25 ℃, the reheating heat exchanger 42 stops operating.
Fifthly, the operation parameters and the control logic of the indoor unit 5 of the dehumidification reheating air conditioner are as follows:
when the system is in radiation refrigeration, a plurality of dehumidification and reheating air conditioner internal units 5 are provided, a high-temperature and high-pressure refrigerant of the outdoor unit 1 enters the dehumidification and reheating air conditioner heat exchangers 52 of the dehumidification and reheating air conditioner internal units 5 through the third refrigerant main pipe for condensation and heat release, and each dehumidification and air conditioner heat exchanger 52 and the first refrigerant main pipe are provided with at least two stages of rated power output pipelines which comprise a dehumidification stage rated power output pipeline and an air conditioner refrigeration stage rated power output pipeline. The rated power of the refrigeration gear of each air conditioner internal unit is the same as that of each air conditioner internal unit, and the rated power of the dehumidification gear is configured according to 30% -60% of the rated power of each air conditioner internal unit.
As an embodiment of the present invention, the technology for controlling the rated output power of the dehumidification and reheating air conditioner internal unit 5 in a stepped manner, that is, in a dehumidification-stage rated power and an air-conditioning refrigeration-stage rated power, also includes the following technical forms, each dehumidification air-conditioning heat exchanger 52 is connected with the first refrigerant main pipe as a pipeline, and stepped control is performed by an electronic throttling device arranged on the pipeline, and the control includes a dehumidification-stage rated power stage and an air-conditioning refrigeration-stage rated power stage, which both play a role in adjusting the rated output power of the dehumidification air-conditioning heat exchanger.
The sum of the total rated output refrigerating capacity and the sum of the heating capacity of the dehumidification and reheating air conditioner internal units 5 are respectively configured according to 80-100% of the rated output refrigerating capacity and the heating capacity of the outdoor host unit 1, and the reheating rated heating capacity of each dehumidification and reheating air conditioner internal unit 5 is configured according to 30-60% of the rated dehumidification refrigerating capacity of the internal unit.
The humidity control setting range of the dehumidification reheating air conditioner internal unit 5 is as follows: the relative humidity of the air in the indoor space is 45-65%, the control quantity of the dehumidifying air-conditioning heat exchanger 52 of each room is controlled according to the relative humidity value of the room set by a user, when the indoor relative humidity is more than or equal to a set value of 2 degrees, the dehumidifying air-conditioning heat exchanger 52 is started, and when the relative humidity is less than or equal to the set value of 2 degrees, the dehumidifying air-conditioning heat exchanger 52 is in a low dehumidifying state or stops working; the control range of the reheating heat exchanger 51 is that the room temperature is set by a user to be 2 ℃ lower, when the room temperature is 2 ℃ lower than the temperature set by the user, the reheating heat exchanger 51 starts to work, and when the room temperature is more than or equal to the temperature set by the user, the reheating heat exchanger 51 stops working.
As an embodiment of the present invention, a summer refrigeration and dehumidification mode refrigerant operation mode is shown in fig. 3 and 4, and includes a refrigeration mode combining air-conditioning refrigeration, domestic hot water, fresh air dehumidification and fresh air reheating; radiation refrigeration, fresh air dehumidification, fresh air reheating, indoor unit dehumidification and indoor unit reheating combined three constant refrigeration modes and the like.
S1, the domestic hot water heat exchange unit provides heat for the domestic hot water;
the refrigerant is compressed by the variable frequency compressor 11, passes through the stop valve a14, flows through the second refrigerant main pipe, and is divided into two paths according to the rated output power of hot water, wherein one path passes through the electromagnetic valve c35 and then is condensed and released to the domestic hot water refrigerant heat exchange module a31, and the heat is transferred to the domestic hot water; the other path of the heat is condensed and released to a domestic hot water refrigerant heat exchange module b32 after passing through an electromagnetic valve d36, and the heat is transferred to domestic hot water; the two paths of the refrigerants subjected to condensation and heat release enter the first refrigerant main pipe.
S2, reheating and heating the fresh air after being frozen and dehumidified by the fresh air dehumidifying and reheating unit;
the refrigerant in the second refrigerant main pipe enters the reheating heat exchanger 42 of the fresh air dehumidifying and reheating unit 4 through the check valve b43 and the electromagnetic valve e44 to be condensed and released, heat is transferred to the dehumidified and cooled fresh air, the temperature of the fresh air is increased, and the condensed and released refrigerant flows into the first refrigerant main pipe.
S3, reheating and heating indoor air by the dehumidification reheating air conditioner indoor unit (when the air conditioner indoor unit is in a heating mode, the function is closed);
the refrigerant in the second refrigerant main pipe passes through the check valve c53 and the solenoid valve f54 and then is condensed and released heat through the inner machine reheating heat exchanger 51, the indoor air is dehumidified and then is reheated and heated to raise the heat, and the condensed and released heat flows into the first refrigerant main pipe.
S4, condensing and releasing heat for outdoor air by the outdoor main machine wind side heat exchanger;
the high-temperature and high-pressure refrigerant discharged from the inverter compressor 11 flows through the end d from the end a of the four-way valve through the other path of the refrigerant at the point E and then flows into the outdoor unit air side heat exchanger 13 to be condensed and released, heat is dissipated into outdoor air, the refrigerant after condensation and heat release flows to the electromagnetic valve 18 and the one-way valve through the point H to the point I, and flows into the first refrigerant main pipe through the stop valve d 17.
S5, the fresh air dehumidification reheating unit performs a fresh air dehumidification and heat absorption process;
after one path of the refrigerant in the first refrigerant main pipe flows into the electronic throttle e45 of the fresh air dehumidification reheating unit 4, evaporation and heat absorption are performed in the dehumidification heat exchanger 41, fresh air is refrigerated and dehumidified, and the refrigerant after evaporation and heat absorption enters the air suction port of the compressor 6 through the fourth refrigerant main pipe.
S6, the cold and hot water heat exchange unit of the radiation system provides refrigeration cold water for the radiation system;
the refrigerant in the first refrigerant main pipe after condensation is divided into two paths after passing through a point V from a point W, wherein one path enters a refrigerant heat exchange module a21 for evaporation and heat absorption after being throttled by an electronic throttling device a2102, and exchanges heat with a cold and hot water heat exchange module water side heat exchanger 23, so that the cold and hot water heat exchange unit 2 of the radiation system provides cooling water for a radiation tail end system, and the two paths of refrigerant after heat absorption reach a point U after passing through a point T and flow into a suction port of the compressor 11 through a third refrigerant main pipe.
When the system is in an air-conditioning refrigeration mode, the electromagnetic valve a2101 and the electromagnetic valve b2201 are closed, and the cold and hot water heat exchange unit 2 of the radiation system stops working.
When the system is in an air-conditioning refrigeration mode and a radiation refrigeration mixed mode, the electromagnetic valve a2101 and the electronic throttling device a2102 are opened, and the electromagnetic valve b2201 and the electronic throttling device b2202 are closed.
When the system is in a radiation refrigeration mode, the electromagnetic valve a2101, the electronic throttling device a2102 and the electromagnetic valve b2201, the electronic throttling device b2202 are opened under a specific condition, for example, the temperature of a radiation surface is higher than the indoor dew point temperature by more than 3 ℃, and meanwhile, the total rated power of the tail end of refrigeration and dehumidification can ensure that the system is opened when the system has a sufficient limit.
S7, cooling and dehumidifying the indoor air by the dehumidification reheating air conditioner indoor unit;
the refrigerant condensed and flowing into the first refrigerant main pipe flows from the R1-nWhen the dehumidification and reheating air conditioner indoor unit 5 operates in a dehumidification mode, the dehumidification electromagnetic valve g55 and the dehumidification electronic throttling device g56 are opened, the refrigerant flowing through is throttled, the refrigerant is evaporated, absorbed in the dehumidification air conditioner heat exchanger 52, cooled, and dehumidifies the indoor air flowing through the dehumidification and reheating air conditioner indoor unit 5 in a circulating mode, and at the moment, the electromagnetic valve h57 and the electronic throttling device h58 of the other air conditioner are in a closed state.
When the dehumidification reheating air conditioner indoor unit operates in an air-conditioning refrigeration mode, the air-conditioning electromagnetic valve h57 and the air-conditioning electronic throttling device h58 are in an open state, the convective refrigerant is throttled and then evaporated and absorbs heat in the dehumidification air-conditioning heat exchanger 52, and the indoor air is cooled in a circulating mode. At this time, the other path of the dehumidification solenoid valve g55 and the dehumidification electronic throttle device g56 are in a closed state.
The refrigerant which is evaporated and absorbs heat in the two working states flows into the B end of the four-way valve through the third refrigerant main pipe, flows out of the C end of the four-way valve and returns to the air suction port of the compressor 11 through the point K.
As an embodiment of the present invention, the operation mode of the refrigerant of the winter heating mode system is shown in fig. 5 to 8, and includes a heating mode combining radiation heating, domestic hot water, fresh air dehumidification and fresh air reheating; a heating mode combining air conditioner heating, domestic hot water, fresh air dehumidification and fresh air reheating; a heating mode combining radiation and air conditioner mixed heating, domestic hot water, fresh air dehumidification and fresh air reheating; and a heating mode combining domestic hot water, fresh air dehumidification, fresh air reheating and indoor unit reheating in spring and autumn transition seasons, and the like.
S1, the domestic hot water heat exchange unit provides heat for the domestic hot water;
the refrigerant flows into a second refrigerant main pipe through a stop valve a14 after being compressed by the variable frequency compressor, the refrigerant is divided into two paths after reaching a point G by a one-way valve a34, and one path of the refrigerant is condensed and released heat to a domestic hot water refrigerant heat exchange module a31 after passing through an electromagnetic valve c35, and the heat is transferred to domestic hot water; the other path of the heat is condensed and released to a domestic hot water refrigerant heat exchange module b32 after passing through an electromagnetic valve d36, and the heat is transferred to domestic hot water; the two paths of the refrigerants subjected to condensation and heat release enter the first refrigerant main pipe.
S2, reheating and heating the fresh air after being frozen and dehumidified by the fresh air dehumidifying and reheating unit;
the high-temperature and high-pressure refrigerant in the second refrigerant main pipe enters the reheating heat exchanger 42 of the fresh air dehumidifying and reheating unit 4 through the check valve b43 and the electromagnetic valve e44 to be condensed and released, heat is transferred to the dehumidified and cooled fresh air, the temperature of the fresh air is increased, and the condensed and released refrigerant flows into the first refrigerant main pipe.
S3, reheating and heating indoor air by the dehumidification reheating air conditioner internal unit;
the high-temperature and high-pressure refrigerant in the second refrigerant main pipe flows through the check valve c53 and the electromagnetic valve f54 from the point Q, enters the reheat heat exchanger 51 of the dehumidification and reheat air conditioner indoor unit 5 to be condensed and released, the air dehumidified by the indoor unit is reheated and heated, and the refrigerant after condensation and heat release flows into the first refrigerant main pipe.
S4, when the air conditioner operates in the air conditioning mode, the indoor unit of the air conditioner heats the indoor air;
the high-temperature and high-pressure refrigerant discharged from the exhaust port of the inverter compressor enters the third refrigerant main pipe through the stop valve b15, enters the dehumidification air-conditioning heat exchanger 52 of the dehumidification and reheating air-conditioning indoor unit 5 from the U point to be condensed and released, transfers the heat to indoor air to perform circulating heating for the indoor air, and the refrigerant after condensation and heat release flows into the first refrigerant main pipe through the R point after passing through the opened air-conditioning electronic throttling device h58 and the air-conditioning electromagnetic valve h 57. At this time, the dehumidification solenoid valve g56 and the dehumidification electronic throttle device g55 are both in a closed state.
S5, the cold and hot water heat exchange unit of the radiation system provides heating hot water for the radiation system;
high-temperature and high-pressure refrigerants flowing out of a U point enter two refrigerant heat exchange modules of the cold and hot water heat exchange unit 2 of different radiation systems in two paths, wherein one path of the refrigerants flows into a refrigerant heat exchange module a21 through an electromagnetic valve a2101 to be condensed and released, and heat of the refrigerants is transferred to air-conditioning circulating water flowing through the heat exchange module water side heat exchanger 23 to supplement heat for heating; the other path of refrigerant flows into the refrigerant heat exchange module b22 for condensation and heat release through the electromagnetic valve b2201, and the heat of the refrigerant is transferred to the air-conditioning circulating water flowing through the heat exchange module water side heat exchanger 23 to supplement heat for temperature rise; two paths of refrigerants which are subjected to condensation and heat release flow into the first refrigerant main pipe from the V point.
S6, a fresh air dehumidification and heat absorption process;
the refrigerant after heat release in the first refrigerant main pipe is throttled by the fresh air dehumidification electronic throttle device e45 from point M, enters the dehumidification heat exchanger 41 for evaporation, heat absorption, temperature reduction and dehumidification, and then flows into the air suction port of the inverter compressor 11 through the fourth refrigerant main pipe.
S7, absorbing heat from outdoor air by the outdoor main machine wind side heat exchanger;
the refrigerant in the first refrigerant main pipe after condensing and releasing heat is throttled by the stop valve D17 and the electronic throttling device 19, enters the outdoor unit air side heat exchanger 13 through the point H to evaporate and absorb heat, absorbs heat from outdoor air, and returns to the air suction port of the inverter compressor 11 after passing through the point K from the end D to the end C of the four-way valve.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A multifunctional variable-rated-power variable-frequency heat pump system at the tail end is characterized by comprising an outdoor unit and a multifunctional tail end output unit connected with the outdoor unit, wherein the multifunctional variable-rated-power variable-frequency heat pump system comprises a radiation system cold and hot water heat exchange unit, a fresh air dehumidification reheating unit, a dehumidification reheating air conditioner internal unit and a domestic hot water heat exchange unit;
the high-temperature and high-pressure refrigerant of the outdoor unit enters the second refrigerant main pipe, flows through the domestic hot water heat exchange unit, is condensed to release heat, and is heated for the domestic hot water; the reheating heat exchanger flowing through the fresh air dehumidifying and reheating unit carries out condensation and heat release, and the heat is transmitted to the dehumidified and cooled fresh air to carry out reheating treatment on the fresh air; the air dehumidified by the dehumidification reheating air conditioner indoor unit is reheated and heated by the reheating heat exchanger of the dehumidification reheating air conditioner indoor unit. The refrigerants after condensation and heat release all flow into the first refrigerant main pipe;
the refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger of the fresh air dehumidification reheating unit to cool and dehumidify the fresh air flowing through the dehumidification heat exchanger, and the refrigerant after evaporation and heat absorption flows into the air suction port of the compressor of the outdoor unit through the fourth refrigerant main pipe;
one end pipeline of the cold and hot water heat exchange unit of the radiation system is connected with a first refrigerant main pipe, and the other end pipeline is connected with an exhaust port of a compressor of the outdoor unit through a third refrigerant main pipe;
under the condition that the rated output power of the outdoor unit is not changed, the multifunctional tail end output unit can perform rated power gear shifting regulation control in different operation modes.
2. The variable-frequency heat pump system according to claim 1, wherein the radiation system hot and cold water heat exchange unit is provided with at least two paths of independently controlled refrigerant heat exchange modules, each refrigerant heat exchange module controls the working condition of each refrigerant heat exchange module through a solenoid valve control system and an electronic throttling device, the rated output power configuration of one path of the refrigerant heat exchange modules is less than or equal to 40% of the total rated output power, the rated output power configuration of the other path of the refrigerant heat exchange modules is greater than or equal to 60% of the total rated output power, and the sum of the rated output powers of the two paths of the refrigerant heat exchange modules is equal to 70-100% of the rated output power of the outdoor unit.
3. The variable-frequency heat pump system according to claim 1, wherein the radiant system hot and cold water heat exchange unit realizes multiple-stage rated power output settings, namely a low-stage radiant hot water, a medium-stage radiant hot water and a high-stage radiant hot water at full opening, through an electronic throttling device and a control system on a pipeline according to rated output powers of different requirements; wherein the rated output power configuration of the low grade of the radiant hot water is less than or equal to 40 percent, the rated output power configuration of the medium grade of the radiant hot water is more than or equal to 60 percent, and the rated output power configuration of the high grade of the radiant hot water is 100 percent.
4. The variable-frequency heat pump system according to claim 1, wherein a plurality of dehumidification and reheating air conditioner internal units are provided, a refrigerant which is condensed and releases heat and then enters the second refrigerant main pipe passes through a dehumidification air conditioner heat exchanger with two gears of different rated output powers and comprises a dehumidification rated power gear with a low gear and an air conditioner refrigeration rated power gear with a high gear, a dehumidification rated output power passage is opened in the dehumidification operation mode, and a rated output power passage is opened in the air conditioner operation mode; the dehumidification rated power gear or the air-conditioning refrigeration rated power gear can realize two-gear rated power output setting through an electronic throttling device and a control system on a pipeline.
5. The variable-frequency heat pump system according to claim 1, wherein the domestic hot water heat exchange unit is a dual-refrigerant heat exchange module, and exchanges heat with a water-side heat exchanger of the same domestic hot water module, each refrigerant heat exchange module is provided with an independent electromagnetic valve control system which can control the opening of each path according to the change of hot water temperature and the condition of required energy, and when a path stops working, the rated heating power of the path can be transferred to other tail end output units.
6. The variable frequency heat pump system according to any one of claims 1 to 5, wherein the outdoor unit comprises a variable frequency compressor, a four-way valve, and an outdoor air side heat exchanger, wherein an exhaust port of the variable frequency compressor is connected to an A end of the four-way valve and connected to the second main refrigerant pipe via a stop valve a, a B end of the four-way valve is connected to the third main refrigerant pipe via a stop valve B, the fourth main refrigerant pipe is connected to a suction port of the variable frequency compressor via a stop valve C, a C end of the four-way valve is connected to the fourth main refrigerant pipe, and a D end of the four-way valve is connected to the first main refrigerant pipe via the outdoor air side heat exchanger and a stop valve D.
7. A method for operating a variable-rated-output-power multifunctional variable-frequency heat pump system, which is used for the variable-frequency heat pump system according to any one of claims 1 to 7, and is characterized by comprising the following steps:
when the operation mode is air conditioner refrigeration, fresh air dehumidification, fresh air reheating, life hot water mode:
the outdoor unit works, and a high-temperature and high-pressure refrigerant passes through the end A of the four-way valve, flows through the end D, enters the outdoor air-side heat exchanger, is condensed and releases heat, and then enters the first refrigerant main pipe; and the other path of refrigerant enters a second refrigerant main pipe.
One path of refrigerant in the second refrigerant main pipe passes through a reheating heat exchanger in the fresh air dehumidification reheating unit to reheat the cooled and dehumidified fresh air, and the other path of refrigerant passes through the domestic hot water heat exchange unit to be condensed and release heat to heat domestic hot water passing through the domestic hot water heat exchange unit and then enters the first refrigerant main pipe;
the refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger in the fresh air dehumidification reheating unit to be throttled, evaporated and heat absorbed, the fresh air flowing through the dehumidification heat exchanger is cooled and dehumidified, and the refrigerant after evaporation and heat absorption flows into a compressor air suction port of the outdoor unit through the fourth refrigerant main pipe;
the refrigerant in the first refrigerant main pipe can respectively flow into an air conditioner internal unit needing to be refrigerated after being throttled by respective electronic throttling devices, and the space where the air conditioner internal unit is located is refrigerated under the condition that the rated output power is the rated power gear of the air conditioner refrigeration;
when three constant modes of refrigeration are selected, namely radiation refrigeration, fresh air dehumidification, fresh air reheating, dehumidification reheating air conditioner internal machine dehumidification and dehumidification reheating air conditioner internal machine reheating:
the outdoor unit works, one path of high-temperature and high-pressure refrigerant flows through the end A of the four-way valve and the end D, enters the outdoor air-side heat exchanger for condensation and heat release, and then enters the first refrigerant main pipe, and the other path of refrigerant enters the second refrigerant main pipe;
one path of the refrigerant in the second refrigerant main pipe is condensed and released through a reheating heat exchanger in the fresh air dehumidifying and reheating unit to reheat and heat the cooled and dehumidified fresh air; in addition, one path of refrigerant flows through the domestic hot water heat exchange unit to be condensed and released, and domestic hot water flowing through the domestic hot water heat exchange unit is heated. The third path of refrigerant respectively flows into a reheating heat exchanger of a dehumidification reheating air conditioner indoor unit needing dehumidification after being throttled by respective electronic throttling devices, condensation heat release is carried out, and indoor air flowing through the reheating heat exchanger of the air conditioner indoor unit is reheated; the refrigerant after condensing and releasing heat all enters the first refrigerant main pipe.
The refrigerant in the first refrigerant main pipe flows through the dehumidification heat exchanger in the fresh air dehumidification reheating unit to be throttled, evaporated and heat absorbed, the fresh air flowing through the dehumidification heat exchanger is cooled and dehumidified, and the refrigerant after evaporation and heat absorption flows into a compressor air suction port of the outdoor unit through the fourth refrigerant main pipe;
the refrigerant in the first refrigerant main pipe can respectively flow into each dehumidification and reheating air conditioner internal unit, an electronic throttling device of each dehumidification and reheating air conditioner internal unit throttles the refrigerant and then flows into a dehumidification air conditioner heat exchanger needing dehumidification operation, and indoor air flowing through the dehumidification air conditioner internal unit is dehumidified under the rated power of a dehumidification gear;
the refrigerant in the first refrigerant main pipe enters the refrigerant heat exchange module of the cold and hot water heat exchange unit of the radiation system under the set low-grade rated output power state to evaporate and absorb heat, and the refrigeration operation is carried out on the high-temperature cold water circulating through the radiation system of the water side heat exchanger of the cold and hot water heat exchange module. The refrigerant after absorbing heat flows through the third refrigerant main pipe, flows through the B end and the C end of the four-way valve and then flows into the air suction port of the outdoor unit compressor.
8. The operation method of the multifunctional variable-frequency heat pump system according to claim 7, wherein when the operation mode is a heating mode, a domestic hot water mode, a fresh air dehumidification mode and a fresh air reheating mode, the operation method comprises the following steps:
the outdoor unit works, and a high-temperature and high-pressure refrigerant enters the second refrigerant main pipe and enters the third refrigerant main pipe after passing through the A end and the B end of the four-way valve;
the refrigerant in the second refrigerant main pipe is condensed and released heat through a reheating heat exchanger in the fresh air dehumidifying and reheating unit and the domestic hot water heat exchange unit respectively and flows into the first refrigerant main pipe;
when the air conditioner is in a heating mode, the refrigerant in the third refrigerant main pipe enters the air conditioner heat exchanger of the dehumidification reheating air conditioner internal unit to be condensed and released, the indoor air flowing through the air conditioner heat exchanger is heated, the condensed and released refrigerant flows into the first refrigerant main pipe, the rated output power of the air conditioner internal unit during heating is 100%, and the cold and hot water heat exchange unit of the radiation system is in a closed working state;
in the radiation heating mode, the refrigerant in the third refrigerant main pipe enters the radiation system cold and hot water heat exchange unit, exchanges heat with the radiation system circulating hot water flowing through the radiation system cold and hot water heat exchange unit to heat the refrigerant, the condensed and heat-released refrigerant flows into the first refrigerant main pipe, the air conditioner indoor unit is in a closed working state at the moment, and the radiation system cold and hot water heat exchange unit is in a 100% working state;
when the radiation heating and air-conditioning heating are mixed, one part of the refrigerant in the third refrigerant main pipe enters the cold and hot water heat exchange unit of the radiation system, the refrigerant exchanges heat with the circulating hot water of the radiation system flowing through the cold and hot water heat exchange unit of the radiation system to heat the refrigerant, the other part of the refrigerant enters the air-conditioning heat exchanger of the dehumidification reheating air-conditioning indoor unit to condense and release heat, the indoor air flowing through the cold and heat exchange unit is heated, the condensed and released refrigerant flows into the first refrigerant main pipe, at the moment, the cold and hot water heat exchange unit of the radiation system is in a low gear, namely, a gear less than or equal to 40 percent, is in a working state, a middle gear, namely, a gear less than or equal to 60 percent, is in a closing state, a gear less than or equal to 40 percent, is in a working state, and the rated output power of the cold and hot water heat exchange unit of the radiation system which is closed is transferred to part of the started air-up air-conditioning indoor unit to heat;
when the operation mode is a domestic hot water, fresh air dehumidification, fresh air reheating and indoor unit reheating operation mode, the outdoor unit works, a high-temperature and high-pressure refrigerant enters the second refrigerant main pipe, the refrigerant in the second refrigerant main pipe is condensed and released heat through the reheating heat exchanger in the fresh air dehumidification reheating unit, the reheating heat exchanger of the dehumidification reheating air conditioner indoor unit and the domestic hot water heat exchange unit respectively, and flows into the first refrigerant main pipe, and at the moment, the reheating rated output power of the reheating heat exchanger in the fresh air dehumidification reheating unit is the rated output power of the outdoor host machine which is not more than 15%, the reheating rated output power of the reheating heat exchanger of the dehumidification reheating air conditioner indoor unit is not more than 50%, and the heating rated output power of the domestic hot water heat exchange unit is not more than 30%;
one path of the refrigerant in the first refrigerant main pipe flows into a dehumidifying heat exchanger in the fresh air dehumidifying and reheating unit to evaporate and absorb heat, so that fresh air is dehumidified, and the refrigerant after evaporation and heat absorption flows into an air suction port of a compressor of the outdoor unit through the fourth refrigerant main pipe; the other path of the air flows into an outdoor unit air side heat exchanger of the outdoor unit to evaporate and absorb heat, and the air flows into a compressor air suction port of the outdoor unit after absorbing heat from outdoor air through a D end and a C end of the four-way valve.
9. The operation method of the multifunctional variable-frequency heat pump system according to claim 7, wherein the radiation system cold and hot water heat exchange unit is provided with two independently controlled refrigerant heat exchange modules which exchange heat with a water side heat exchanger in the same cold and hot water output unit respectively; each refrigerant heat exchange module is provided with an electromagnetic valve control system and an electronic throttling device, the working condition of each refrigerant heat exchange module is controlled through the electromagnetic valve control system and the electronic throttling device, the sum of rated output energy of the two refrigerant heat exchange modules is equal to 70-100% of rated output energy of an outdoor host unit, the rated output energy of one refrigerant heat exchange module is less than or equal to 40% of low-grade rated output energy of the total refrigerant heat exchange module, and the rated output energy of the other refrigerant heat exchange module is greater than or equal to 60% of medium-grade rated output energy of the total refrigerant heat exchange module.
10. The operation method of the multifunctional variable-frequency heat pump system according to any one of claims 7 to 9, wherein the sum of the total rated output refrigerating capacity and the sum of the heating capacity of all the indoor units of the dehumidifying and reheating air-conditioning indoor units are respectively configured according to 80-100% of the rated output refrigerating capacity and the heating capacity of the outdoor host unit, and the rated dehumidifying output power of the dehumidifying and reheating air-conditioning indoor units is configured according to 30-60% of the rated air-conditioning power of each dehumidifying and reheating air-conditioning indoor unit; the reheating rated output power of each dehumidification and reheating air conditioner indoor unit is configured according to 30-60% of rated dehumidification cooling capacity of the dehumidification and reheating air conditioner indoor unit.
CN202011050381.6A 2020-09-29 2020-09-29 Multifunctional variable-rated-power-end variable-frequency heat pump system and operation method Pending CN113294900A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113883579A (en) * 2021-10-29 2022-01-04 青岛海信日立空调系统有限公司 Water system air conditioner
CN114110981A (en) * 2021-11-24 2022-03-01 广东美的制冷设备有限公司 Fresh air equipment control method and device, fresh air equipment and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113883579A (en) * 2021-10-29 2022-01-04 青岛海信日立空调系统有限公司 Water system air conditioner
CN113883579B (en) * 2021-10-29 2022-11-22 青岛海信日立空调系统有限公司 Water system air conditioner
CN114110981A (en) * 2021-11-24 2022-03-01 广东美的制冷设备有限公司 Fresh air equipment control method and device, fresh air equipment and storage medium

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