CN108679868B - Self-operated multifunctional heat pump system and control method thereof - Google Patents

Self-operated multifunctional heat pump system and control method thereof Download PDF

Info

Publication number
CN108679868B
CN108679868B CN201810503031.7A CN201810503031A CN108679868B CN 108679868 B CN108679868 B CN 108679868B CN 201810503031 A CN201810503031 A CN 201810503031A CN 108679868 B CN108679868 B CN 108679868B
Authority
CN
China
Prior art keywords
reversing valve
heat exchanger
port
heat
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810503031.7A
Other languages
Chinese (zh)
Other versions
CN108679868A (en
Inventor
唐兰
聂志辉
穆欢
黎清荐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou University
Original Assignee
Guangzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangzhou University filed Critical Guangzhou University
Priority to CN201810503031.7A priority Critical patent/CN108679868B/en
Publication of CN108679868A publication Critical patent/CN108679868A/en
Application granted granted Critical
Publication of CN108679868B publication Critical patent/CN108679868B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/20Disposition of valves, e.g. of on-off valves or flow control valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/027Compression machines, plant, or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742Compression machines, plant, or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves

Abstract

The invention relates to a self-operated multifunctional heat pump system and a control method thereof, wherein the self-operated multifunctional heat pump system comprises a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first reversing valve, a second reversing valve, a throttling device, a liquid storage device, a gas-liquid separator, a hot water circulating pump, a cold water circulating pump and an outdoor fan. Compared with the prior art, the self-operated multifunctional heat pump system has multiple operation modes through the control of the reversing valve and the starting and stopping of the outdoor fan, the hot water circulating pump and the cold water circulating pump: the refrigeration and heating device can refrigerate and heat simultaneously, refrigerate independently or heat independently, the most appropriate operation mode can be automatically selected under different working conditions, the balance between the supply and the demand of cold and heat is realized, all functions can be automatically controlled and realized, and manual operation is not needed.

Description

Self-operated multifunctional heat pump system and control method thereof
Technical Field
The invention relates to the technical field of air conditioners and heat pump hot water, in particular to a self-operated multifunctional heat pump system and a control method thereof.
Background
With the development of economy and the improvement of living standard, the demand of cold water and hot water is gradually increased, the energy consumption of buildings accounts for 30% -40% of the total energy consumption every year, the energy consumption of hot water in civil buildings is about 30% of the total energy consumption of buildings, but cold water and hot water are separately supplied in the market at present, the traditional hot water supply mode mainly adopts boilers, the consumed energy is high-grade energy such as coal, petroleum, natural gas and the like, the energy utilization rate is low, the safety is poor, and along with serious pollution and carbon dioxide emission, the energy and the environmental protection are harmed in many aspects; meanwhile, the condensation heat of the air conditioning system is directly discharged to the outdoor air, which has a great influence on the local heat environment of the city (von laudong, structural design and topological optimization of the air source heat pump water heater [ D ], university of fertilizer industry, 2012).
In various civil and industrial occasions, cold water and hot water (Zhou PHNIX combined cooling and heating heat pump is successfully applied to Shanghai Peixin packaging Limited company [ J ] front package edge, 2014(4): 33-35; Guoguedong and the like, research and development of milk station energy-saving and emission-reducing combined cooling and heating unit [ J ]. contemporary livestock breeding industry, 2012(6): 56-58; Peng development, Zhan Xinrong.food processing industry using natural working medium [ J ]. refrigeration and air conditioning, 2015,15(12): 67-71; Yiyi combined cooling and heating heat pump application [ J ] Guangdong packaging, 2013:87-90) in printing industry are needed to be simultaneously provided, and the current combined cooling and heating system mainly comprises a heat engine-based combined cooling and heating system, a combined cooling and heating system and a heat pump heat recovery combined cooling and heating system. The heat engine-based combined cooling and heating system improves the comprehensive utilization efficiency of energy to a certain extent, but mainly consumes fossil energy such as natural gas and the like, and has no obvious advantages in the aspect of reducing carbon emission (Wangcolong and the like, heat engine-based combined cooling and heating system CN103673389A [ P ] 2014); the combined cooling heating and power supply is based on energy gradient utilization, can improve the comprehensive utilization efficiency of energy, reduce the emission of pollutants, relieve the advantages of power shortage and the like, but has larger scale, is generally divided into a building type, a regional type and an industrial type, and is not suitable for small places (Yangan and the like, the current situation and the development trend of the domestic combined cooling heating and power supply system [ J ]. the chemical industry report, 2015,66(s2): 1-9).
The principle of the heat pump is a reverse carnot cycle, in which refrigerant vapor of low temperature and low pressure is compressed by a compressor into high pressure and high temperature vapor and discharged, and flows into a condenser, where heat is transferred to the surrounding medium, so that the refrigerant vapor is gradually condensed into liquid, the refrigerant liquid from the condenser is throttled down to evaporation pressure, and part of flash vapor is generated, and the throttled gas-liquid mixture enters an evaporator to evaporate and absorb the heat of the surrounding medium, and becomes gaseous refrigerant, and then enters the compressor to be compressed, and the cycle is repeated (zhahu. heat pump technology [ M ]. beijing: chemical industry press, 2007). In the whole circulation process, the heat pump can absorb heat from a low-temperature heat source and transport the heat to a high-temperature heat source by inputting a small amount of electric energy, low-grade energy in the nature is fully utilized, if an energy supply scheme of combined supply of cold and heat is implemented by the heat pump, the condensation heat of an air conditioner is used as a free heat source to prepare hot water, the initial investment is reduced, the operation cost can be reduced, and most importantly, the energy consumption and the influence of a large amount of condensation heat on the environment can be reduced. However, for the heat pump system, the heating capacity is equal to the sum of the cooling capacity and the consumed power, that is, the heating capacity is always greater than the cooling capacity, in daily production life, the required cooling capacity and the required heating capacity can change according to factors such as seasonal variation, so that the required cooling capacity and the required heating capacity are not matched with the cooling capacity and the heating capacity of the heat pump unit, and according to the relative value, the heat pump system can be divided into three conditions of simultaneously requiring cooling capacity and heat, only requiring cooling capacity and only requiring heat, in order to meet the use requirement, an operation mode corresponding to the cooling and heating capacity requirement is realized by optimizing the structural design and the pipeline layout, and the matching of the cooling and heating capacity and the supply.
There are many forms of combined heat and cold heat pump systems, and different forms of combined heat and cold heat pump systems are discussed below:
(1) cold and hot combined supply system without reversing valve
For example, although the purpose of combined cooling and heating can be achieved by the solutions in patent documents such as "a combined cooling and heating heat pump unit" in patent publication No. CN2632558Y, "a seawater desalination combined cooling and heating device" in patent publication No. CN102838181A, "a heat step utilization heat pump system for achieving combined cooling and heating" in patent publication No. CN206056012U, the system structure is too simple, the operation mode is single, the balance is achieved or cannot be adjusted only by controlling a valve or a bypass, only the adjustment of combined cooling and heating and the imbalance in extreme cases can be satisfied, and most of the solutions perform heat or cooling recovery while performing cooling or heating.
(2) Cold and hot combined supply system of single reversing valve
The patent documents of patent publication No. CN2884059Y, "cold and hot water combined supply chiller unit", patent publication No. CN201229088Y, "multiple heat source triple supply heat pump chiller-heater unit", patent publication No. CN201680649U, "soil source heat pump hot water air conditioning cold and hot water combined supply system", patent publication No. CN106679223A, "a heat recovery triple supply system", and the like all adopt a single four-way valve, and the operation mode of the chiller can be adjusted by the reversing function of the four-way valve, so as to solve the problem of unbalanced cold and hot supply demand, but because the adjusting capability of the single four-way valve is limited, under the conditions of spring and autumn transition seasons and the like, the phenomenon of unbalanced cold and hot can occur, for example, the patent document scheme of patent publication No. CN2884059Y has the disadvantages that when the cold demand is small, the heat recovery amount does not meet the use requirement, domestic hot water cannot be prepared separately, auxiliary.
(3) Cold and hot combined supply system with reversing valve and auxiliary valve
The 'ground source heat pump central air conditioning hot water triple co-generation unit' of patent publication No. CN203024477U adopts 10 electric ball valves, and realizes balance of cold and hot supply by controlling the switch of the electric ball valves to realize multiple operation modes; the air energy heat pump triple supply system of patent publication No. CN204854070U adopts a form of combining a four-way valve with an electromagnetic valve, a stop valve and a one-way valve to realize the balance of cold and hot supply by adjusting the operation mode of a unit; the cold, warm and hot triple heat supply pump unit of patent publication No. CN201715778U adopts a double four-way valve structure, and realizes multiple operation modes by combining the auxiliary action of valves to solve the question and answer of unbalanced cold and heat supply. Although the heat pump system can realize the balance type of cold and heat supply and demand by using various types and numbers of valves and adjusting the operation mode of the unit, the system has a complex structure, the manufacturing cost is increased, the control is not easy, and the operation is unstable. And because the heat exchangers of the system are in a parallel structure, the refrigerant distribution is not uniform.
Disclosure of Invention
The invention aims to disclose a self-operated multifunctional heat pump system, which solves the problem of unbalance of cooling capacity and heat supply and demand under the conditions of transition seasons and the like of the traditional heat recovery system, and correspondingly discloses a control method of the self-operated multifunctional heat pump system.
The invention discloses a self-operated multifunctional heat pump system which comprises a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first reversing valve, a second reversing valve, a throttling device, a liquid storage device, a gas-liquid separator, a hot water circulating pump, a cold water circulating pump and an outdoor fan, wherein the first heat exchanger is connected with the first heat exchanger through the first heat exchanger;
an air outlet of the compressor is connected with an inlet of the first heat exchanger, an outlet of the first heat exchanger is connected with a port D of the first reversing valve, a port C of the first reversing valve is connected with an inlet of the liquid storage device, an outlet of the liquid storage device is connected with an inlet of the throttling device, an outlet of the throttling device is connected with a port D of the second reversing valve, a port C of the second reversing valve is connected with an inlet of the second heat exchanger, an outlet of the second heat exchanger is connected with an inlet of the gas-liquid separator, an outlet of the gas-liquid separator is connected with an air suction port of the compressor, a port E of the first reversing valve is connected with an air collection pipe end of the third heat exchanger, a port S of the first reversing valve is connected with a port S of the second reversing valve, and a port E of the second reversing valve is connected with an air distributor end of the third heat exchanger;
the hot water circulating pump is additionally connected with the first heat exchanger through a pipeline to provide power for hot water circulation; the cold water circulating pump is connected with the second heat exchanger through a pipeline to provide power for cold water circulation; and the outdoor fan is arranged at the third heat exchanger to provide heat dissipation for the third heat exchanger.
Further, the throttling device is an electronic expansion valve or a thermal expansion valve or a capillary tube.
Furthermore, the first reversing valve and the second reversing valve are electromagnetic switching valves or four-way valves or four-port switching valves and all valve combinations meeting the flow direction requirements.
Furthermore, the first heat exchanger is always a condenser in a working state, the second heat exchanger is always an evaporator in the working state, and the third heat exchanger is a dual-purpose heat exchanger for evaporation and condensation.
Further, the first heat exchanger and the second heat exchanger are sleeve-type heat exchangers, coil-type heat exchangers, plate-type heat exchangers or pressure-bearing water tanks with heat exchange functions; the third heat exchanger is a finned tube heat exchanger.
Further, the compressor, the first reversing valve, the second reversing valve, the hot water circulating pump, the cold water circulating pump and the outdoor fan are controlled by programs to automatically operate.
Furthermore, the first heat exchanger and the hot water circulating pump are connected with an external hot water tank through pipelines so as to realize hot water circulation; the second heat exchanger and the cold water circulating pump are connected with an external cold water tank through pipelines so as to realize cold water circulation.
The invention correspondingly discloses a control method of the self-operated multifunctional heat pump system, which comprises the following steps of:
a1, keeping the first reversing valve and the second reversing valve in a closed state, sequentially communicating pipelines from a compressor exhaust port to a first reversing valve port C through a first heat exchanger, a first reversing valve port D, a reservoir, a throttling device, a second reversing valve port D to a second reversing valve port C through a second heat exchanger, a gas-liquid separator and a compressor suction port, and disconnecting the pipeline between the third heat exchanger and the first reversing valve and the second reversing valve;
a2, starting a hot water circulating pump and a cold water circulating pump, and turning off an outdoor fan;
a3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to flow into the first heat exchanger, heating the water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into a throttling device through a first reversing valve and a liquid storage device, and forms a low-temperature low-pressure refrigerant after adiabatic expansion; the low-temperature low-pressure refrigerant flows into the second heat exchanger through the second reversing valve, and flows into the gas-liquid separator after cooling water in the cold water tank and heating the water per se;
a4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
and A5, circularly executing the steps A1 to A4 to achieve the purpose of cooling and heating at the same time.
Further, in the control method of the self-operated multifunctional heat pump system, the individual cooling mode control includes:
b1, keeping the first reversing valve in an open state, keeping the second reversing valve in a closed state, and sequentially communicating a pipeline from the exhaust port of the compressor to the E port of the first reversing valve, the D port of the first reversing valve, the E port of the second reversing valve to the S port of the second reversing valve, the S port of the first reversing valve to the C port of the first reversing valve, a liquid storage device, a throttling device, the D port of the second reversing valve to the C port of the second reversing valve, the second heat exchanger, the gas-liquid separator and the suction port of the compressor through the first heat exchanger and the D port of the first reversing valve;
b2, turning off the hot water circulating pump, turning on the cold water circulating pump, and turning on the outdoor fan;
b3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to sequentially flow through the first heat exchanger, the first reversing valve and the third heat exchanger, and discharging heat outwards by the third heat exchanger to condense the refrigerant; the condensed refrigerant flows through the second reversing valve, the first reversing valve, the liquid storage device and the throttling device in sequence, and forms a low-pressure low-temperature refrigerant after being subjected to adiabatic expansion through the throttling device; the low-pressure low-temperature state refrigerant flows into the second heat exchanger through the second reversing valve, and flows into the gas-liquid separator after cooling water in the cold water tank and heating the water per se;
b4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
b5, circularly executing the steps B1 to B4 to achieve the aim of independent refrigeration.
Further, in the control method of the self-operated multifunctional heat pump system, the control of the individual heating mode includes:
c1, keeping the first reversing valve in a closed state, keeping the second reversing valve in an open state, and sequentially communicating the air exhaust port of the compressor, the first heat exchanger, the port D of the first reversing valve, the port C of the first reversing valve, the reservoir, the throttling device, the port D of the second reversing valve, the port E of the second reversing valve, the third heat exchanger, the port E of the first reversing valve, the port S of the second reversing valve, the port C of the second reversing valve, the second heat exchanger, the gas-liquid separator and the air suction port of the compressor through pipelines;
c2, starting a hot water circulating pump, closing a cold water circulating pump, and starting an outdoor fan;
c3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to flow into the first heat exchanger, heating the water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into a throttling device through a first reversing valve and a liquid storage device, and forms a low-temperature low-pressure refrigerant after adiabatic expansion; the low-temperature and low-pressure refrigerant flows into the third heat exchanger through the second reversing valve; the third heat exchanger absorbs heat outwards to heat the refrigerant; the heated refrigerant flows through a first reversing valve, a second heat exchanger and a gas-liquid separator in sequence;
c4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
c5, circularly executing the steps C1 to C4 to achieve the aim of independent heating.
Compared with the prior art, the self-operated multifunctional heat pump system has multiple operation modes through the control of the reversing valve and the starting and stopping of the outdoor fan, the hot water circulating pump and the cold water circulating pump: the refrigeration and heating device can refrigerate and heat simultaneously, refrigerate independently or heat independently, the most appropriate operation mode can be automatically selected under different working conditions, the balance between the supply and the demand of cold and heat is realized, all functions can be automatically controlled and realized, and manual operation is not needed.
Drawings
Fig. 1 is a schematic view of the overall structure of a self-operated multifunctional heat pump system according to an embodiment of the disclosure.
Fig. 2 is a schematic view of the operation principle of fig. 1 in the simultaneous cooling and heating mode.
Fig. 3 is a schematic view of the operation of fig. 1 in a cooling only mode.
Fig. 4 is a schematic view of the operation principle of fig. 1 in the heating-only mode.
Detailed Description
In order to better explain the present invention, the following description is given with reference to the embodiments and the accompanying drawings. It is to be understood that these embodiments and the accompanying drawings are illustrative only and are not to be construed as limiting the invention.
Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example one
As shown in fig. 1, a self-operated multifunctional heat pump system disclosed in the first embodiment includes a compressor 1, a first heat exchanger 2, a second heat exchanger 7, a third heat exchanger 11, a first reversing valve 3, a second reversing valve 6, a throttling device 5, a reservoir 4, a gas-liquid separator 8, a hot water circulating pump 9, a cold water circulating pump 10, and an outdoor fan 12.
An exhaust port of the compressor 1 is connected with an inlet of the first heat exchanger 2, an outlet of the first heat exchanger 2 is connected with a D port of the first reversing valve 3, a C port of the first reversing valve 3 is connected with an inlet of the liquid storage device 4, an outlet of the liquid storage device 4 is connected with an inlet of the throttling device 5, an outlet of the throttling device 5 is connected with a D port of the second reversing valve 6, a C port of the second reversing valve 6 is connected with an inlet of the second heat exchanger 7, an outlet of the second heat exchanger 7 is connected with an inlet of the gas-liquid separator 8, an outlet of the gas-liquid separator 8 is connected with an air suction port of the compressor 1, an E port of the first reversing valve 3 is connected with an air collection pipe end of the third heat exchanger 11, an S port of the first reversing valve 3 is connected with an S port of the second reversing valve 6, and an E port of the second reversing valve.
The hot water circulating pump 9 is additionally connected with the first heat exchanger 2 through a pipeline to provide power for hot water circulation; the cold water circulating pump 9 is additionally connected with the second heat exchanger 7 through a pipeline to provide power for cold water circulation; the outdoor fan 12 is installed at the third heat exchanger 11 to provide heat radiation to the third heat exchanger 11.
In a further scheme, the throttling device 5 is an electronic expansion valve or a thermal expansion valve or a capillary tube, and the opening degree can be adjusted by controlling the superheat degree of the refrigerant. The first change valve 3 and the second change valve 6 are electromagnetic type switch valves or four-way valves or four-port type switch valves and all valve combinations meeting the flow direction requirements. The first heat exchanger 2 is always a condenser in a working state, the second heat exchanger 7 is always an evaporator in the working state, and the third heat exchanger 11 is a dual-purpose heat exchanger for evaporation and condensation.
In a further scheme, the first heat exchanger 2 and the second heat exchanger 7 are sleeve-type heat exchangers, or coil-type heat exchangers, or plate-type heat exchangers, or pressure-bearing water tanks with heat exchange functions; the third heat exchanger 11 is a finned tube heat exchanger.
In a further scheme, the first heat exchanger 2 and the hot water circulating pump 9 are connected with an external hot water tank (not shown) through pipelines to realize hot water circulation; the second heat exchanger 7 and the cold water circulating pump 10 are connected with an external cold water tank (not shown) through pipelines to realize cold water circulation. In this embodiment, the first heat exchanger 2 and the second heat exchanger 7 are located inside the unit and are correspondingly connected with the hot water tank and the cold water tank through pipelines, which is beneficial to reducing the flow resistance of the refrigerant increased due to overlong pipelines, thereby reducing the running current of the compressor and improving the energy efficiency ratio of the compressor.
As an alternative, the connecting pipelines among the compressor 1, the first heat exchanger, the first reversing valve 3, the reservoir 4, the throttling device 5, the second reversing valve, the second heat exchanger, the gas-liquid separator 8 and the third heat exchanger are preferably copper tubes.
In a further scheme, the compressor 1, the first reversing valve 3, the second reversing valve 6, the hot water circulating pump 9, the cold water circulating pump 10 and the outdoor fan 12 are controlled by programs to automatically operate
In the first embodiment, three operation modes of simultaneous cooling and heating, independent cooling and independent heating can be adjusted by controlling the start and stop of the hot water circulating pump 9, the cold water circulating pump 10 and the outdoor fan 12 and the opening and closing of the first reversing valve 3 and the second reversing valve 6, and specific reference is made to the second embodiment below.
Example two
The second embodiment discloses a control method of a self-operated multifunctional heat pump system on the basis of the first embodiment, the composition of the self-operated multifunctional heat pump system is the same as that of the first embodiment, and the control method comprises a simultaneous cooling and heating mode, an independent cooling mode and an independent heating mode. The working mode can be automatically adjusted according to actual working conditions, the most suitable working mode can be automatically selected under different working conditions, all functions can be switched by adopting a control program, manual operation is not needed, the product operation is simple, and the automatic adjustment device can be suitable for personnel who are not trained specially to use.
1. Simultaneous cooling and heating mode control
Referring to fig. 2, the simultaneous cooling and heating mode control includes the following steps S101 to S105:
s101, keeping the first reversing valve 3 and the second reversing valve 6 in a closed state, sequentially communicating pipelines from an exhaust port of the compressor 1 to a port C of the first reversing valve 3, a reservoir 4, a throttling device 5, a port D of the second reversing valve 6 to a port C of the second reversing valve 6, a second heat exchanger 7, a gas-liquid separator 8 and an air suction port of the compressor 1 through a first heat exchanger 2 and a port D of the first reversing valve 3, and disconnecting a pipeline between a third heat exchanger 11 and the first reversing valve 3 and the second reversing valve 6.
And S102, starting the hot water circulating pump 9 and the cold water circulating pump 10, and turning off the outdoor fan 12.
S103, controlling the high-temperature and high-pressure refrigerant compressed by the compressor 1 to flow into the first heat exchanger 2, heating water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into a throttling device 5 through a first reversing valve 3 and a liquid storage device 4, and forms a low-temperature low-pressure refrigerant after adiabatic expansion; the low-temperature and low-pressure refrigerant flows into a second heat exchanger 7 through a second reversing valve 6, cools water in the cold water tank, heats the water per se and then flows into a gas-liquid separator 8.
S104, the compressor 1 is controlled to suck the refrigerant flowing out of the gas-liquid separator 8.
And S105, circularly executing the steps S101 to S104 to achieve the purpose of cooling and heating at the same time.
2. Individual refrigeration mode control
Referring to fig. 3, the individual cooling mode control includes the following steps S201 to S205:
s201, keeping the first reversing valve 3 in an open state, keeping the second reversing valve 6 in a closed state, and sequentially communicating a gas exhaust port of the compressor 1, the first heat exchanger 2, a D port of the first reversing valve 3, the E port of the first reversing valve 3, the third heat exchanger 11, the E port of the second reversing valve 6, the S port of the first reversing valve 3, the C port of the first reversing valve 3, the liquid storage device 4, the throttling device 5, the D port of the second reversing valve 6, the C port of the second reversing valve 6, the second heat exchanger 7, the gas-liquid separator 8 and a gas suction port of the compressor 1 through pipelines.
S202, the hot water circulating pump 9 is turned off, the cold water circulating pump 10 is turned on, and the outdoor fan 12 is turned on.
S203, controlling the high-temperature and high-pressure refrigerant compressed by the compressor 1 to flow through the first heat exchanger 2, the first reversing valve 3 and the third heat exchanger 11 in sequence, and discharging heat outwards from the third heat exchanger 11 to condense the refrigerant; the condensed refrigerant sequentially flows through a second reversing valve 6, a first reversing valve 3, a liquid accumulator 4 and a throttling device 5, and forms a low-pressure low-temperature refrigerant after adiabatic expansion through the throttling device 5; the low-pressure low-temperature state refrigerant flows into a second heat exchanger 7 through a second reversing valve 6, cools water in the cold water tank, heats the water per se at the same time, and then flows into a gas-liquid separator 8.
S204, the compressor 1 is controlled to suck the refrigerant flowing out of the gas-liquid separator 8.
S205, circularly executing the steps S201 to S204 to achieve the purpose of independent refrigeration.
3. Individual heating mode control
Referring to fig. 4, the individual heating mode control includes the following steps S301 to S305:
s301, keeping the first reversing valve 3 in a closed state, keeping the second reversing valve 6 in an open state, and sequentially communicating a gas exhaust port of the compressor 1 to the first heat exchanger 2, a D port of the first reversing valve 3 to a C port of the first reversing valve 3, the liquid storage device 4, the throttling device 5, a D port of the second reversing valve 6 to an E port of the second reversing valve 6, the third heat exchanger 11, an E port of the first reversing valve 3 to an S port of the first reversing valve 3, an S port of the second reversing valve 6 to a C port of the second reversing valve 6, the second heat exchanger 7, the gas-liquid separator 8 and a gas suction port of the compressor 1 through pipelines.
S302, starting a hot water circulating pump 9, closing a cold water circulating pump 10, and starting an outdoor fan 12.
S303, controlling the high-temperature and high-pressure refrigerant compressed by the compressor 1 to flow into the first heat exchanger 2, heating water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into a throttling device 5 through a first reversing valve 3 and a liquid storage device 4, and forms a low-temperature low-pressure refrigerant after adiabatic expansion; the low-temperature and low-pressure refrigerant flows into the third heat exchanger 11 through the second reversing valve 6; the third heat exchanger 11 absorbs heat outwards to heat the refrigerant; the heated refrigerant flows through the first direction valve 3, the second direction valve 6, the second heat exchanger 7, and the gas-liquid separator 8 in this order.
S304, the compressor 1 is controlled to suck the refrigerant flowing out of the gas-liquid separator 8.
S305, circularly executing the steps S301 to S304 to achieve the purpose of independent heating.
The switching points of the three working modes under the automatic program control mainly refer to the temperatures of hot water and cold water. When the temperature of the cold water is higher than a set temperature value and the temperature of the hot water is lower than the set temperature value, the cold quantity and the heat quantity need to be provided at the same time, and the system sends an instruction to operate in a simultaneous refrigerating and heating mode; when the temperature of the cold water is higher than the set temperature value and the temperature of the hot water is higher than the set temperature value, the system sends an instruction to operate in an independent refrigeration mode only by providing cold energy; when the temperature of the cold water is lower than a set temperature value and the temperature of the hot water is lower than the set temperature value, the fact that heat needs to be provided is indicated, and the system sends an instruction to operate in a single heating mode; when the temperature of the cold water is lower than the set value and the temperature of the hot water is higher than the set value, the system sends out an instruction to stop the machine.
In conclusion, the invention can realize the balance of cold quantity and heat quantity, does not need auxiliary equipment and has simple operation.
Although the present invention has been described above by way of example, it will be appreciated by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A self-operated multifunctional heat pump system is characterized by comprising a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first reversing valve, a second reversing valve, a throttling device, a liquid storage device, a gas-liquid separator, a hot water circulating pump, a cold water circulating pump and an outdoor fan;
the exhaust port of the compressor is connected with the inlet of the first heat exchanger, the outlet of the first heat exchanger is connected with the D port of the first reversing valve, the port C of the first reversing valve is connected with the inlet of the liquid storage device, the outlet of the liquid storage device is connected with the inlet of the throttling device, the outlet of the throttling device is connected with the D port of the second reversing valve, the C port of the second reversing valve is connected with the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected with the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected with the air suction port of the compressor, the port E of the first reversing valve is connected with the end of a gas collecting pipe of the third heat exchanger, the port S of the first reversing valve is connected with the port S of the second reversing valve, and the port E of the second reversing valve is connected with the end of a liquid distributor of the third heat exchanger;
the hot water circulating pump is additionally connected with the first heat exchanger through a pipeline to provide power for hot water circulation; the cold water circulating pump is connected with the second heat exchanger through a pipeline to provide power for cold water circulation; the outdoor fan is arranged at the third heat exchanger to provide heat dissipation for the third heat exchanger; the first heat exchanger and the hot water circulating pump are connected with an external hot water tank through pipelines so as to realize hot water circulation; the second heat exchanger and the cold water circulating pump are connected with an external cold water tank through pipelines so as to realize cold water circulation.
2. The self-operated multifunctional heat pump system according to claim 1, wherein the throttling device is an electronic expansion valve or a thermal expansion valve or a capillary tube.
3. The self-operated multifunctional heat pump system according to claim 1, wherein the first direction valve and the second direction valve are electromagnetic type switching valves or four-way valves or four-port type switching valves.
4. The self-operated multifunctional heat pump system of claim 1, wherein the first heat exchanger is a heat exchanger
The heat exchanger is always a condenser in a working state, the second heat exchanger is always an evaporator in a working state, and the third heat exchanger is a dual-purpose heat exchanger for evaporation and condensation.
5. The self-operated multifunctional heat pump system according to claim 1, wherein the first heat exchanger and the second heat exchanger are double-pipe heat exchangers, coil heat exchangers, plate heat exchangers or pressure-bearing water tanks with heat exchange function; the third heat exchanger is a finned tube heat exchanger.
6. The self-operated multifunctional heat pump system according to claim 1, wherein the compressor, the first reversing valve, the second reversing valve, the hot water circulating pump, the cold water circulating pump and the outdoor fan are controlled by a program to automatically operate.
7. A control method of a self-operated multifunctional heat pump system according to any one of claims 1 to 6, wherein the simultaneous cooling and heating mode control comprises:
a1, keeping the first reversing valve and the second reversing valve in a closed state, sequentially communicating pipelines from a compressor exhaust port to a first reversing valve port C through a first heat exchanger, a first reversing valve port D, a reservoir, a throttling device, a second reversing valve port D to a second reversing valve port C through a second heat exchanger, a gas-liquid separator and a compressor suction port, and disconnecting the pipeline between the third heat exchanger and the first reversing valve and the second reversing valve;
a2, starting a hot water circulating pump and a cold water circulating pump, and turning off an outdoor fan;
a3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to flow into the first heat exchanger, heating the water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into a throttling device through a first reversing valve and a liquid storage device, and forms a low-temperature low-pressure refrigerant after adiabatic expansion; the low-temperature low-pressure refrigerant flows into the second heat exchanger through the second reversing valve, and flows into the gas-liquid separator after cooling water in the cold water tank and heating the water per se;
a4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
and A5, circularly executing the steps A1 to A4 to achieve the purpose of cooling and heating at the same time.
8. The method of controlling a self-operated multifunctional heat pump system as claimed in claim 7, wherein the individual cooling mode control comprises:
b1, keeping the first reversing valve in an open state, keeping the second reversing valve in a closed state, and sequentially communicating the first heat exchanger, the first reversing valve D port, the first reversing valve E port, the third heat exchanger, the second reversing valve E port, the second reversing valve S port, the first reversing valve S port, the reservoir, the throttling device, the second reversing valve D port, the second reversing valve C port, the second heat exchanger, the gas-liquid separator and the compressor air suction port through pipelines;
b2, turning off the hot water circulating pump, turning on the cold water circulating pump, and turning on the outdoor fan;
b3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to sequentially flow through the first heat exchanger, the first reversing valve and the third heat exchanger, and discharging heat outwards by the third heat exchanger to condense the refrigerant; the condensed refrigerant flows through the second reversing valve, the first reversing valve, the liquid storage device and the throttling device in sequence, and forms a low-pressure low-temperature refrigerant after being subjected to adiabatic expansion through the throttling device; the low-pressure low-temperature refrigerant flows into the second heat exchanger through the second reversing valve, and flows into the gas-liquid separator after cooling water in the cold water tank and heating the water per se;
b4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
b5, circularly executing the steps B1 to B4 to achieve the aim of independent refrigeration.
9. The method of controlling a self-operated multifunctional heat pump system as claimed in claim 8, wherein the individual heating mode control comprises:
c1, keeping the first reversing valve in a closed state, keeping the second reversing valve in an open state, and sequentially communicating the air exhaust port of the compressor, the first heat exchanger, the port D of the first reversing valve, the port C of the first reversing valve, the reservoir, the throttling device, the port D of the second reversing valve, the port E of the second reversing valve, the third heat exchanger, the port E of the first reversing valve, the port S of the second reversing valve, the port C of the second reversing valve, the second heat exchanger, the gas-liquid separator and the air suction port of the compressor through pipelines;
c2, starting a hot water circulating pump, closing a cold water circulating pump, and starting an outdoor fan;
c3, controlling the high-temperature and high-pressure refrigerant compressed by the compressor to flow into the first heat exchanger, heating the water in the hot water tank and cooling the hot water tank; the cooled refrigerant flows into the throttling device through the first reversing valve and the liquid storage device, and is insulated
Forming low-temperature and low-pressure refrigerant after expansion; the low-temperature and low-pressure refrigerant flows into the third heat exchanger through the second reversing valve; the third heat exchanger absorbs heat outwards to heat the refrigerant; the heated refrigerant flows through a first reversing valve, a second heat exchanger and a gas-liquid separator in sequence;
c4, controlling the compressor to suck the refrigerant flowing out of the gas-liquid separator;
c5, circularly executing the steps C1 to C4 to achieve the aim of independent heating.
CN201810503031.7A 2018-05-23 2018-05-23 Self-operated multifunctional heat pump system and control method thereof Active CN108679868B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810503031.7A CN108679868B (en) 2018-05-23 2018-05-23 Self-operated multifunctional heat pump system and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810503031.7A CN108679868B (en) 2018-05-23 2018-05-23 Self-operated multifunctional heat pump system and control method thereof

Publications (2)

Publication Number Publication Date
CN108679868A CN108679868A (en) 2018-10-19
CN108679868B true CN108679868B (en) 2020-10-09

Family

ID=63807866

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810503031.7A Active CN108679868B (en) 2018-05-23 2018-05-23 Self-operated multifunctional heat pump system and control method thereof

Country Status (1)

Country Link
CN (1) CN108679868B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109595848B (en) * 2018-12-07 2020-10-27 广州大学 Triple air-conditioning hot water system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1996875A4 (en) * 2005-12-16 2011-01-19 Carrier Corp Heat pump with pulse width modulation control
CN101852515B (en) * 2010-01-09 2011-11-16 广东美的电器股份有限公司 Heat pump air conditioning water heater
CN203518326U (en) * 2013-07-24 2014-04-02 广州春光新能源科技发展有限公司 Domestic combined cooling heating and power system
CN106288488B (en) * 2016-08-29 2019-02-01 广东美的暖通设备有限公司 The control method of air-conditioner system and air-conditioner system
CN107917547A (en) * 2016-10-09 2018-04-17 卢海南 The coolant circulating device of heat pump air-conditioner/water heater
CN107883576A (en) * 2017-12-13 2018-04-06 鞍山巨鼎科技有限公司 Cooling in summer recuperation of heat heat supply in winter heat pump hot-water system

Also Published As

Publication number Publication date
CN108679868A (en) 2018-10-19

Similar Documents

Publication Publication Date Title
CN201476406U (en) Low-temperature quasi-two-stage air source heat pump unit
CN109341138B (en) Combined air conditioning system of machine room and hot water system and control method thereof
WO2017219650A1 (en) Air conditioning system, composite condenser, and operation control method and device for air conditioning system
CN201363859Y (en) Air conditioning unit
CN103868281B (en) A kind of single/double stage compresses switchable tri-generation system of ground-source heat pump
WO2011113295A1 (en) Multifunctional air-conditioning and hot-water system
CN108679868B (en) Self-operated multifunctional heat pump system and control method thereof
CN202757346U (en) Central air-conditioning and hot water all-in-one machine
US11137178B2 (en) Cold energy recovery-type variable-capacity air-source heat pump system
CN101382354A (en) Double- effective day/night high temperature water-water heat pump hot water unit
CN202057111U (en) Multifunctional air source hot water and air-conditioning heat pump unit
CN109340960B (en) Combined air conditioning system of machine room and control method thereof
CN102003834B (en) Multifunctional air source hot water and air conditioning heat pump unit
CN110017530B (en) Household triple-generation heat pump unit
CN208720535U (en) A kind of manifold type high temperature space energy heat-pump hot-water unit
CN102305497A (en) Dual-purpose machine of refrigerant natural balanced type air conditioner and heat pump water heater
CN201034394Y (en) Air-conditioning hot pump hot-water machine set
CN202254484U (en) Air conditioner and heat pump water heater dual-purpose machine based on refrigerant natural balance technique
CN203413743U (en) Heat pipe and heat pump composite system
CN102494375A (en) Ultrahigh and low-temperature refrigerating, heating and water heating three-purpose air-conditioning system
CN101986063A (en) Multifunctional air-source hot-water and heat-pump unit with electronic expansion valves
CN204494922U (en) A kind of evaporative condenser flooded screw handpiece Water Chilling Units
CN109357426B (en) Combined air conditioning system for machine room and control method thereof
CN203036901U (en) Cooling-and-heating type heat pipe heat pump composite circulating system
CN202057112U (en) Multifunctional source hot-water and heat pump unit adopted electronic expansion valve

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant