Cold and warm type multi-connected heat pump, Control method and control device of cold and warm type multi-connected heat pump

Abstract

The present application relates to the technical field of heat pump, and provides a cold and warm type multi-connected heat pump, a control method and a control device of the cold and warm type multi-connected heat pump, the cold and warm type multi-connected heat pump comprising a plurality of indoor heat exchangers arranged in parallel, a first check valve being arranged between the outlet of each indoor heat exchanger and a first collecting pipe and conducting to the first collecting pipe, a second check valve being arranged between a second collecting pipe and the outlet of each indoor heat exchanger and conducting to the outlet of the indoor heat exchanger; a plurality of first electric valves, the plurality of first electric valves being arranged in one-to-one correspondence with the plurality of indoor heat exchangers, and each first electric valve being communicated with the inlet of the corresponding indoor heat exchanger, the exhaust port of a compressor and a third collecting pipe. By adjusting the state of the first electric valve and the throttling valve, effective energy transfer can be realized, heat is directly taken from the unit needing refrigeration and sent to the unit needing heating, the compressor can work once to simultaneously solve the demand for refrigeration and heating, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pumps, in particular to a cooling and heating type multi-connected heat pump, a control method and a control device of the cooling and heating type multi-connected heat pump. BACKGROUND

[0002] In an industrial or civil facility, there may be both rooms needing cooling and rooms needing heating in the same factory or building. In the related art, in order to meet the cooling and heating demands of different areas, different air conditioning systems are installed to control the rooms needing cooling to release heat to the outside and the rooms needing heating to absorb heat from the outside, and the two systems work independently, which causes waste of energy. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a cooling and heating type multi-connected heat pump, which can realize effective energy transfer by adjusting the states of a first electric valve and a throttling valve, and can directly send heat absorbed from a unit needing cooling to a unit needing heating, so that the compressor can work once to meet the cooling and heating demands, thereby improving the energy utilization efficiency.

[0004] The present application also provides a control method of the cooling and heating type multi-connected heat pump.

[0005] The present application also provides a control device of the cooling and heating type multi-connected heat pump.

[0006] The present application also provides an electronic device.

[0007] According to the cooling and heating type multi-connected heat pump provided by the first aspect of the present application, the cooling and heating type multi-connected heat pump comprises:

[0008] a plurality of indoor heat exchangers arranged in parallel;

[0009] a first header pipe and a second header pipe arranged side by side, a first check valve for conducting to the first header pipe being arranged between the outlet of each indoor heat exchanger and the first header pipe, and a second check valve for conducting to the outlet of each indoor heat exchanger being arranged between the second header pipe and the outlet of each indoor heat exchanger;

[0010] a heat exchanger, a first heat exchange inlet of the heat exchanger being communicated with the first header pipe, and a first heat exchange outlet of the heat exchanger being communicated with the second header pipe and a second heat exchange inlet of the heat exchanger;

[0011] a first throttling valve arranged at the second heat exchange inlet;

[0012] a second throttling valve arranged between the second header pipe and the first heat exchange outlet of the heat exchanger;

[0013] a compressor, a suction port of the compressor being communicated with the second heat exchange outlet of the heat exchanger;

[0014] a third header pipe being communicated with the suction port of the compressor;

[0015] a plurality of first electric valves, the plurality of first electric valves being arranged one-to-one with the plurality of indoor heat exchangers, the first electric valves being used for adjusting the communication state between the inlets of the indoor heat exchangers, the exhaust port of the compressor and the third header pipe.

[0016] According to one embodiment of the present application, each of the first electric valves is communicated with the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor and the third header pipe, and each of the first electric valves comprises a first state, a second state and a third state;

[0017] In the first state, the inlet of the corresponding indoor heat exchanger is communicated with the exhaust port of the compressor;

[0018] In the second state, the inlet of the corresponding indoor heat exchanger is communicated with the third header pipe;

[0019] In the third state, neither the exhaust port of the compressor nor the third header pipe is communicated with the inlet of the indoor heat exchanger.

[0020] According to one embodiment of the present application, further comprising:

[0021] an outdoor heat exchanger, an inlet of the outdoor heat exchanger being communicated with the first heat exchange outlet of the heat exchanger;

[0022] a third throttling valve arranged at the inlet of the outdoor heat exchanger;

[0023] a third check valve arranged between the third throttling valve and the inlet of the outdoor heat exchanger, the third check valve being conducted to the inlet of the outdoor heat exchanger;

[0024] a fourth check valve arranged between the inlet of the outdoor heat exchanger and the first heat exchange inlet of the heat exchanger, the fourth check valve being conducted to the first heat exchange inlet;

[0025] a second electric valve being communicated with the outlet of the outdoor heat exchanger, the suction port of the compressor and the exhaust port of the compressor, the second electric valve comprising a condenser state, an evaporator state and a closed state;

[0026] In the condenser state, the outlet of the outdoor heat exchanger is communicated with the exhaust port of the compressor;

[0027] In the evaporator state, the outlet of the outdoor heat exchanger is communicated with the suction port of the compressor;

[0028] In the closed state, the suction port of the compressor and the exhaust port of the compressor are both communicated with the outlet of the outdoor heat exchanger.

[0029] According to one embodiment of the present application, further comprising:

[0030] a low pressure sensor arranged at the suction port of the compressor;

[0031] a high pressure sensor arranged at the exhaust port of the compressor.

[0032] According to one embodiment of the present application, further comprising:

[0033] a first temperature sensor arranged at one end of the second header tube close to the first heat exchange outlet;

[0034] a second temperature sensor arranged at one end of the third header tube close to the suction port of the compressor.

[0035] According to the control method of the cold and warm multi-connected heat pump provided by the second aspect of the present application, comprising:

[0036] acquiring the working mode of the cold and warm multi-connected heat pump;

[0037] when the working mode is the cold and warm combined supply mode, controlling the first electric valve corresponding to the heat supply indoor heat exchanger to be in the first state, and controlling the first electric valve corresponding to the cold supply indoor heat exchanger to be in the second state, and controlling the first throttling valve and the second throttling valve to be opened.

[0038] According to one embodiment of the present application, when the working mode is the cold and warm combined supply mode, further comprising:

[0039] acquiring the total heat supply amount and the total cold supply amount of the cold and warm multi-connected heat pump;

[0040] when the total heat supply amount is greater than the total cold supply amount, controlling the second electric valve to be in the evaporator state, and controlling the third throttling valve to be opened;

[0041] when the total heat supply amount is less than the total cold supply amount, controlling the second electric valve to be in the condenser state;

[0042] when the total heat supply amount is equal to the total cold supply amount, controlling the second electric valve to be in the closed state.

[0043] According to one embodiment of the present application, the step of acquiring the total heat supply amount and the total cold supply amount of the cold and warm multi-connected heat pump, further comprising:

[0044] adjusting the wind speed of the outdoor fan according to the difference between the total heat supply amount and the total cold supply amount.

[0045] According to one embodiment of the present application, the step of obtaining the working mode of the cold and warm multi-connected heat pump further comprises:

[0046] When the working mode is the single warm mode, the first electric valve corresponding to the indoor heat exchanger for heating is in the first state, the second electric valve is in the evaporator state, and the third throttling valve is open;

[0047] When the working mode is the single cold mode, the first electric valve corresponding to the indoor heat exchanger for cooling is in the second state, the second electric valve is in the condenser state, and the second throttling valve is open.

[0048] According to one embodiment of the present application, when the cold and warm multi-connected heat pump switches from the single warm mode to the cold and warm combined supply mode, the method comprises:

[0049] controlling the second throttling valve to be in an initial opening degree, and obtaining a first temperature difference between the second temperature and the first temperature;

[0050] controlling the opening degree of the third throttling valve according to the first temperature difference and a preset condition;

[0051] The preset condition comprises:

[0052] The first temperature difference is less than or equal to a first preset temperature.

[0053] According to one embodiment of the present application, the step of switching the cold and warm multi-connected heat pump from the single warm mode to the cold and warm combined supply mode further comprises:

[0054] obtaining the total heating capacity and the total cooling capacity of the cold and warm multi-connected heat pump, and obtaining the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating;

[0055] determining the corresponding saturation temperature according to the exhaust pressure, and calculating a second temperature difference between the saturation temperature and the ambient temperature;

[0056] When the second temperature difference is greater than or equal to a second preset temperature, the second electric valve is controlled to be in the condenser state.

[0057] According to the third aspect of the present application, the control device of the cold and warm multi-connected heat pump comprises:

[0058] an obtaining module for obtaining the working mode of the cold and warm multi-connected heat pump;

[0059] a control module for, when the working mode is the cold and warm combined supply mode, controlling the first electric valve corresponding to the indoor heat exchanger for heating to be in the first state, and controlling the first electric valve corresponding to the indoor heat exchanger for cooling to be in the second state, and controlling the first throttling valve and the second throttling valve to be open.

[0060] According to the electronic device provided by the fourth aspect of the present application, the electronic device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the control method of the cold and warm multi-connected heat pump provided by the third aspect of the present application when executing the program.

[0061] The one or more technical solutions in the present application have at least one of the following technical effects:

[0062] According to the cold and warm multi-connected heat pump provided by the first aspect of the present application, the cold and warm multi-connected heat pump comprises indoor heat exchangers, a first collecting pipe, a second collecting pipe, a first check valve, a second check valve, a heat exchanger, a first throttling valve, a second throttling valve, a compressor, a third collecting pipe, and first electric valves; the number of the indoor heat exchangers is multiple, and the multiple indoor heat exchangers are arranged in parallel; the first collecting pipe and the second collecting pipe are arranged side by side; the first check valve is arranged between the outlet of each indoor heat exchanger and the first collecting pipe and is conducted to the first collecting pipe; the second check valve is arranged between the second collecting pipe and the outlet of each indoor heat exchanger and is conducted to the outlet of the indoor heat exchanger; the first heat exchange inlet of the heat exchanger is communicated with the first collecting pipe, the first heat exchange outlet of the heat exchanger is communicated with the second collecting pipe and the second heat exchange inlet of the heat exchanger; the first throttling valve is arranged at the second heat exchange inlet; the second throttling valve is arranged between the second collecting pipe and the first heat exchange outlet of the heat exchanger; the suction port of the compressor is communicated with the second heat exchange outlet of the heat exchanger, and the third collecting pipe is communicated with the suction port of the compressor; the first electric valves are multiple, the multiple first electric valves are arranged in one-to-one correspondence with the multiple indoor heat exchangers, and each first electric valve is communicated with the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor, and the third collecting pipe; each first electric valve comprises a first state, a second state, and a third state; in the first state, the inlet of the corresponding indoor heat exchanger is communicated with the exhaust port of the compressor; in the second state, the inlet of the corresponding indoor heat exchanger is communicated with the third collecting pipe; in the third state, neither the exhaust port of the compressor nor the third collecting pipe is communicated with the inlet of the indoor heat exchanger. By adjusting the states of the corresponding first electric valves and the throttling valves, effective energy transfer can be realized, heat is directly taken from the units that need to be cooled and is directly sent to the units that need to be heated, the compressor can solve the needs of both sides at one time, and the energy utilization efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0064] Figure 1A schematic structural view of a cold and warm multi-connected heat pump provided for an embodiment of the present application;

[0065] Figure 2 A schematic structural view of state switching of a first electric valve and a second electric valve provided for an embodiment of the present application;

[0066] Figure 3 A flow chart of a control method of a cold and warm multi-connected heat pump provided for an embodiment of the present application;

[0067] Figure 4 A structural schematic view of a control device of a cold and warm multi-connected heat pump provided for an embodiment of the present application;

[0068] Figure 5 A structural schematic view of an electronic device provided for an embodiment of the present application.

[0069] Reference signs:

[0070] 10, indoor heat exchanger; 11, first header; 12, second header; 13, first check valve; 14, second check valve; 15, heat exchanger; 16, first throttling valve; 17, second throttling valve; 18, compressor; 19, third header; 20, first electric valve; 21, outdoor heat exchanger; 22, third throttling valve; 23, third check valve; 24, fourth check valve; 25, second electric valve; 26, low pressure sensor; 27, high pressure sensor; 28, first temperature sensor; 29, second temperature sensor;

[0071] 301, acquisition module; 302, control module. DETAILED DESCRIPTION

[0072] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly described below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0073] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0074] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0075] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0076] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0077] In the related art, in order to meet the cold and heat demand of different areas, different air conditioning systems are installed, the room for refrigeration releases heat to the outdoor, the room for heating absorbs heat from the outdoor, and the two systems work independently, energy is not effectively utilized, and certain waste is caused.

[0078] According to the cold and warm multi-connected heat pump provided by the embodiment of the first aspect of the present application, referring to Figure 1 and Figure 2 , the cold and warm multi-connected heat pump comprises an indoor heat exchanger 10, a first collecting pipe 11, a second collecting pipe 12, a first check valve 13, a second check valve 14, a heat exchanger 15, a first throttling valve 16, a second throttling valve 17, a compressor 18, a third collecting pipe 19 and a first electric valve 20.

[0079] The cold and warm multi-connected heat pump provided by the embodiment of the present application comprises a plurality of indoor units, and the indoor heat exchanger 10 is arranged in each indoor unit. Figure 1 Only the components related to the refrigerant circulation loop are shown, for example, an indoor fan, a filter screen and a wind deflector arranged at an air outlet of the indoor unit are arranged in each indoor unit, and these components have little influence on understanding the working principle of the cold and warm multi-connected heat pump, therefore, they are not shown in the accompanying drawings or separately described in the specification. Figure 1 The remaining related components can be similar or the same as those in the related art.

[0080] Referring to Figure 1 , the plurality of indoor heat exchangers 10 are arranged in parallel, and different indoor heat exchangers 10 are arranged in different rooms or working areas, for example, the first indoor heat exchanger 10 is arranged in a room requiring heating, the second indoor heat exchanger 10 is arranged in a living room, and the third indoor heat exchanger 10 is arranged in a room requiring refrigeration. Figure 1 Three indoor heat exchangers 10 are shown, which run in heating mode, stop and refrigeration mode respectively, and the number of indoor heat exchangers 10 in each operating state can be increased as needed.

[0081] The indoor heat exchanger 10 has an inlet and an outlet, and the inlet and the outlet can have refrigerant flowing in or flowing out.

[0082] The first and second collecting pipes 11 and 12 are arranged side by side, the outlet of each indoor heat exchanger 10 is provided with two branches, one of which is communicated with the first collecting pipe 11 and the other is communicated with the second collecting pipe 12, a first check valve 13 is arranged between the outlet of each indoor heat exchanger 10 and the first collecting pipe 11 and leads to the first collecting pipe 11, and a second check valve 14 is arranged between the second collecting pipe 12 and the outlet of each indoor heat exchanger 10 and leads to the outlet of the indoor heat exchanger 10.

[0083] The heat exchanger 15 can be a flat plate heat exchanger, which has a first heat exchange inlet, a first heat exchange outlet, a second heat exchange inlet and a second heat exchange outlet, wherein the first heat exchange inlet is communicated with the first heat exchange outlet and the second heat exchange inlet is communicated with the second heat exchange outlet, forming two parallel heat exchange pipelines to realize heat exchange.

[0084] Please refer to Figure 1 , the first heat exchange inlet of the heat exchanger 15 is communicated with the first collecting pipe 11 and the first heat exchange outlet is communicated with the second collecting pipe 12 and the second heat exchange inlet.

[0085] The first throttling valve 16 is arranged at the second heat exchange inlet and the second throttling valve 17 is arranged between the second collecting pipe 12 and the first heat exchange outlet of the heat exchanger, the suction port of the compressor 18 is communicated with the second heat exchange outlet of the heat exchanger 15 and the third collecting pipe 19 is communicated with the suction port of the compressor 18.

[0086] The cold and warm type multi-connected heat pump provided by the embodiment of the application comprises a plurality of first electric valves 20, please refer to Figure 2 , the first electric valve 20 comprises a shell, a valve core and a driving assembly, two parallel chambers, for example, a first chamber and a second chamber, are formed in the shell, a sliding channel communicated with the first chamber and the second chamber is further arranged in the shell, the valve core is slidingly connected to the sliding channel, the driving assembly is connected to the valve core through electromagnetic force or a worm and gear structure, and an avoiding groove is formed on the side away from each other of the first chamber and the second chamber, and the left and right avoiding grooves are located on the same axis as the sliding channel.

[0087] The shell is further formed with a first inlet and a first outlet communicated with the first chamber and a second inlet and a second outlet communicated with the second chamber; when the valve core moves to the avoiding groove on the left side, the second inlet is communicated with the second outlet; when the valve core moves to the avoiding groove on the right side, the first inlet is communicated with the first outlet; when the valve core is located in the middle of the sliding channel, the first inlet and the first outlet are not communicated and the second inlet and the second outlet are not communicated.

[0088] Wherein, the valve core moves to the right side of the avoidance slot, corresponding to the first state of the first electric valve 20; the valve core moves to the left side of the avoidance slot, corresponding to the second state of the first electric valve 20; the valve core is located in the middle of the slide, corresponding to the third state of the first electric valve 20.

[0089] The plurality of first electric valves 20 are arranged one by one corresponding to the plurality of indoor heat exchangers 10, and each first electric valve 20 is communicated with the inlet of the corresponding indoor heat exchanger 10, the exhaust port of the compressor 18 and the third header 19, that is, the first inlet is communicated with the exhaust port of the compressor, the first outlet and the second inlet are communicated with the inlet of the indoor heat exchanger 10, and the second outlet is communicated with the third header 19.

[0090] It should be noted that the first electric valve 20 can also be other types of three-way valves or four-way valves, which can be simultaneously communicated with the inlet of the indoor heat exchanger 10, the exhaust port of the compressor 18 and the third header 19, and switch the communication state thereof.

[0091] In the first state, the inlet of the corresponding indoor heat exchanger 10 is communicated with the exhaust port of the compressor 18.

[0092] In the second state, the inlet of the corresponding indoor heat exchanger 10 is communicated with the third header 19;

[0093] In the third state, neither the exhaust port of the compressor 18 nor the third header 19 is communicated with the inlet of the indoor heat exchanger 10.

[0094] The cold and warm type multi-connected heat pump provided by the embodiment of the present application runs in the cold and warm combined supply mode, for example Figure 1 The first indoor heat exchanger 10 in the middle heats, the second indoor heat exchanger 10 stops, and the third indoor heat exchanger 10 cools, so that the first electric valve 20 corresponding to the indoor heat exchanger 10 for heating is in the first state, the first electric valve 20 corresponding to the indoor heat exchanger 10 for cooling is in the second state, the first electric valve 20 of the indoor heat exchanger 10 not running is in the third state, and the first throttling valve 16 and the second throttling valve 17 are opened.

[0095] The flow process of the refrigerant is as follows:

[0096] Please refer to Figure 1, the compressor 18 will high temperature and high pressure refrigerant along the left side of the first electric valve 20 into the indoor heat exchanger 10, can be in the corresponding area under the action of indoor fan heating. The heat exchanger after the refrigerant along the first check valve 13 into the first manifold 11 and heat exchanger 15, the first heat exchanger inlet, heat exchanger for the enthalpy heat exchanger, liquid refrigerant out of the heat exchanger 15 after the first branch, auxiliary road through the first throttle valve 16 throttling pressure return heat exchanger 15 gasification, then back to the suction port of the compressor 18, the main road of supercooled refrigerant through the second throttle valve 17 throttling pressure after the right side of the second check valve 14 into the refrigeration indoor heat exchanger 10. Among them, the first throttle valve 16 and the second throttle valve 17 opening and proportion can control the proportion of refrigerant flowing through the first throttle valve 16 and the second throttle valve 17, and then realize accurate refrigeration.

[0097] According to the above, the compressor 18 of the cold and warm type multi-connected heat pump provided by the embodiment of the present application can realize effective energy transfer by adjusting the state of the first electric valve 20 and the throttle valve when working, and the heat absorbed from the unit needing refrigeration can be directly sent to the unit needing heating. The compressor 18 can solve the demand of both sides by one work, and the energy utilization efficiency is improved. When the compressor works, only the maximum heating demand or the maximum refrigeration demand needs to be met, and the corresponding refrigeration demand or heating demand is transferred by the refrigerant circulation loop. The total power consumption of the cold and warm type multi-connected heat pump is reduced from the sum of the total heating power consumption and the total refrigeration power consumption to the total heating power consumption or the total refrigeration power consumption, and the energy saving effect is obvious.

[0098] In some embodiments, the cold and warm type multi-connected heat pump provided by the embodiment of the present application further comprises an outdoor heat exchanger 21, a third throttle valve 22, a third check valve 23, a fourth check valve 24 and a second electric valve 25.

[0099] Please refer to Figure 1 The inlet of the outdoor heat exchanger 21 is communicated with the first heat exchanger outlet of the heat exchanger 15, the third throttle valve 22 is arranged at the inlet of the outdoor heat exchanger 21, the third check valve 23 is arranged between the third throttle valve 22 and the inlet of the outdoor heat exchanger 21, and the third check valve 23 is conducted to the inlet of the outdoor heat exchanger 21. The fourth check valve 24 is arranged between the inlet of the outdoor heat exchanger 21 and the first heat exchanger inlet of the heat exchanger 15, and the fourth check valve 24 is conducted to the first heat exchanger inlet.

[0100] The second electric valve 25 is identical or similar to the first electric valve 20, and in the embodiment of the application, a four-way valve of the same type is used for convenience of control. The second electric valve 25 is connected to the outlet of the outdoor heat exchanger 21, the suction port of the compressor 18 and the discharge port of the compressor 18, and comprises a condenser state, an evaporator state and a closed state; wherein the condenser state, the evaporator state and the closed state correspond to the second state, the first state and the third state of the first electric valve 20 respectively, and since the functions of the electric valves are different at different positions, the names are defined respectively to avoid confusion.

[0101] In the condenser state, the outlet of the outdoor heat exchanger 21 is connected to the discharge port of the compressor 18.

[0102] In the evaporator state, the outlet of the outdoor heat exchanger 21 is connected to the suction port of the compressor 18.

[0103] In the closed state, neither the suction port of the compressor 18 nor the discharge port of the compressor 18 is connected to the outlet of the outdoor heat exchanger 21.

[0104] As known from the above, the cold and warm multi-connected heat pump provided by the embodiment of the application adds the outdoor heat exchanger 21 and the matched pipeline, the outdoor heat exchanger 21 is connected to not only the suction port of the compressor but also the discharge port of the compressor, and the state of the second electric valve 25 is switched to make the outdoor heat exchanger 21 play the role of the condenser or the evaporator.

[0105] The cold and warm multi-connected heat pump provided by the embodiment of the application may have a case that the heat supply is greater than the cooling supply or a case that the heat supply is less than the cooling supply when operating in the cold and warm combined supply mode, and at this time, a part of heat or cooling needs to be supplemented from the outside.

[0106] When the working mode is the cold and warm combined supply mode, the method further comprises:

[0107] obtaining the total heat supply and the total cooling supply of the cold and warm multi-connected heat pump;

[0108] when the total heat supply is greater than the total cooling supply, controlling the second electric valve to be in the evaporator state and controlling the third throttling valve to be opened;

[0109] when the total heat supply is less than the total cooling supply, controlling the second electric valve to be in the condenser state;

[0110] when the total heat supply is equal to the total cooling supply, controlling the second electric valve to be in the closed state.

[0111] The specific working principle is as follows:

[0112] When the total heating amount is greater than the total cooling amount, the system also needs to absorb heat from the outside, at this time the outdoor heat exchanger 21 is in the evaporator mode, the second electric valve 25 is in the evaporator state, the third throttling valve 22 is opened, and the supercooled refrigerant liquid flowing out of the heat exchanger 15 is divided into two paths, one path enters the indoor heat exchanger 10 for refrigeration through the second throttling valve 17, and the other path enters the outdoor heat exchanger 21 for heat absorption through the third throttling valve 22, and finally returns to the suction port of the compressor 18 through the second electric valve 25. Conversely, when the total heating amount is less than the total cooling amount, the system needs to release heat to the air, at this time the outdoor heat exchanger 21 is in the condenser mode, the second electric valve 25 is in the condenser state, and the exhaust gas of the compressor 18 enters the indoor heat exchanger 10 for heating and the other path enters the outdoor heat exchanger 21 through the second electric valve 25, and the refrigerant is condensed after heat dissipation and then enters the indoor heat exchanger 10 for refrigeration.

[0113] In the embodiment, not only cold and warm combined supply can be realized, but also cold and warm combined supply with different amounts can be realized, and the application range is wider.

[0114] In some embodiments, the cold and warm multi-connected heat pump further comprises a low-pressure sensor 26 and a high-pressure sensor 27, the low-pressure sensor 26 is arranged at the suction port of the compressor 18, and the high-pressure sensor 27 is arranged at the exhaust port of the compressor 18, and the cold and warm multi-connected heat pump can control the operation of the compressor or the throttling valve according to the pressure of the suction port and the pressure of the exhaust port.

[0115] In some embodiments, the cold and warm multi-connected heat pump further comprises a first temperature sensor 28 and a second temperature sensor 29, the first temperature sensor 28 is arranged at one end of the second header pipe 12 close to the first heat exchange outlet, and the second temperature sensor 29 is arranged at one end of the third header pipe 19 close to the suction port of the compressor 18. The cold and warm multi-connected heat pump can assist in controlling the opening degree of the throttling valve, the state of the first electric valve 20 and the second electric valve 25, or the frequency of the compressor, etc. according to the first temperature detected by the first temperature sensor 28 and the second temperature detected by the second temperature sensor 29.

[0116] According to the control method of the cold and warm multi-connected heat pump provided by the second aspect of the embodiment of the present application, please refer to Figure 3 , which comprises:

[0117] S200, obtaining the working mode of the cold and warm multi-connected heat pump.

[0118] S210, when the working mode is the cold and warm combined supply mode, controlling the first electric valve corresponding to the indoor heat exchanger for heating to be in the first state, and controlling the first electric valve corresponding to the indoor heat exchanger for cooling to be in the second state, and controlling the first throttling valve and the second throttling valve to be opened.

[0119] In step S210, the compressor 18 compresses the high-temperature and high-pressure refrigerant along the left first electric valve 20 into the indoor heat exchanger 10, which can heat the corresponding area under the action of the indoor fan. The heat-exchanged refrigerant flows into the first header 11 and the first heat exchange inlet of the heat exchanger 15 along the first check valve 13. The plate heat exchanger is an enthalpy-increasing heat exchanger. After the liquid refrigerant flows out of the plate heat exchanger, it is divided into two paths. The auxiliary path passes through the first throttling valve 16 to reduce pressure and return to the heat exchanger 15 to absorb heat and gasify, and then returns to the suction port of the compressor 18. The supercooled refrigerant in the main path passes through the second throttling valve 17 to reduce pressure, and then enters the indoor heat exchanger 10 for refrigeration through the right second check valve 14. The opening and proportion of the first throttling valve 16 and the second throttling valve 17 can control the proportion of the refrigerant flowing through the first throttling valve 16 and the second throttling valve 17, thereby realizing precise refrigeration.

[0120] By adjusting the state of the first electric valve 20 and the throttling valve, effective energy transfer can be realized, and the heat absorbed from the unit needing refrigeration is directly sent to the unit needing heating. The compressor 18 can solve the demand of both sides with one work, improving the energy utilization efficiency. When the compressor works, only the maximum heating demand or the maximum refrigeration demand needs to be met, and the corresponding refrigeration demand is transferred by the refrigerant circulation loop. The total power consumption of the cold and warm multi-connected heat pump is reduced from the sum of the total heating power consumption and the total refrigeration power consumption to the total heating power consumption or the total refrigeration power consumption, and the energy-saving effect is obvious.

[0121] In some embodiments, when the working mode is the cold and warm combined supply mode, the method further comprises:

[0122] Obtaining the total heating capacity and the total cooling capacity of the cold and warm multi-connected heat pump.

[0123] When the total heating capacity is greater than the total cooling capacity, controlling the second electric valve to be in an evaporator state, and controlling the third throttling valve to be open;

[0124] When the total heating capacity is less than the total cooling capacity, controlling the second electric valve to be in a condenser state;

[0125] When the total heating capacity is equal to the total cooling capacity, controlling the second electric valve to be in a closed state.

[0126] It can be understood that when the working mode is the cold and warm combined supply mode, there are different cases of heat supply and cold supply; when the total heat supply is greater than the total cold supply, the system also needs to absorb heat from the outside world, at this time the outdoor heat exchanger 21 is in the evaporator mode, the second electric valve 25 is in the evaporator state, the third throttling valve 22 is opened, and the supercooled refrigerant liquid flowing out of the heat exchanger 15 is divided into two paths, one path enters the indoor heat exchanger 10 for refrigeration through the second throttling valve 17, and the other path enters the outdoor heat exchanger 21 for heat absorption through the third throttling valve 22, and finally returns to the suction port of the compressor 18 through the second electric valve 25. Conversely, when the total heat supply is less than the total cold supply, the system needs to release heat to the air, at this time the outdoor heat exchanger 21 is in the condenser mode, the second electric valve 25 is in the condenser state, and the exhaust of the compressor 18 enters the indoor heat exchanger 10 that needs to be heated, and the other path enters the outdoor heat exchanger 21 through the second electric valve 25, and the refrigerant is condensed after heat dissipation, then enters the heat exchanger 15 through the fourth check valve 24, and then enters the indoor heat exchanger 10 for refrigeration.

[0127] In this embodiment, not only can cold and warm combined supply be achieved, but also cold and warm combined supply of different amounts can be achieved, and the application range is wider.

[0128] In some embodiments, the step of obtaining the total heat supply and the total cold supply of the cold and warm multi-connected heat pump further includes:

[0129] According to the difference between the total heat supply and the total cold supply, the wind speed of the outdoor fan is adjusted.

[0130] It can be understood that as the wind speed of the outdoor fan increases, the heat exchange rate between the outdoor heat exchanger and the outdoor air increases, and more cold or heat can be provided to the system in unit time to make up for the difference between the total heat supply and the total cold supply. Therefore, when the difference between the total heat supply and the total cold supply is determined, the wind speed of the outdoor fan required can be calculated inversely.

[0131] According to an embodiment of the present application, the step of obtaining the working mode of the cold and warm multi-connected heat pump further includes:

[0132] When the working mode is the single warm mode, the first electric valve corresponding to the indoor heat exchanger for heat supply is in the first state, the second electric valve is controlled to be in the evaporator state, and the third throttling valve is controlled to be opened.

[0133] It can be understood that the cold and warm multi-connected heat pump can operate in the single warm mode, that is, all or part of the indoor heat exchangers 10 are heated, at this time the second electric valve is controlled to be in the evaporator state, and the outdoor heat exchanger is switched to the evaporator mode to absorb heat from the outdoor air.

[0134] When the working mode is the single-cooling mode, the first electric valve corresponding to the indoor heat exchanger for supplying cooling is in the second state, the second electric valve is controlled to be in the condenser state, and the second throttling valve is controlled to be open.

[0135] It can be understood that the cooling and heating type multi-connected heat pump can run in the single-cooling mode, that is, all or part of the indoor heat exchangers 10 perform refrigeration, at this time, the second electric valve 25 is controlled to be in the condenser state, and the outdoor heat exchanger 21 is switched to the condenser mode to dissipate heat to the outdoor air.

[0136] In some embodiments, the cooling and heating type multi-connected heat pump can first run in the single-warming mode, and during the running process, a refrigeration demand is generated, and it is required to switch from the single-warming mode to the cooling and heating combined supply mode, and the control method of the cooling and heating type multi-connected heat pump comprises the following steps:

[0137] controlling the second throttling valve to be in the initial opening degree, and obtaining a first temperature difference between the second temperature and the first temperature;

[0138] controlling the opening degree of the third throttling valve according to the first temperature difference and a preset condition.

[0139] The preset condition comprises that the first temperature difference is less than or equal to a first preset temperature.

[0140] It can be understood that when the cooling and heating type multi-connected heat pump switches from the single-warming mode to the cooling and heating combined supply mode, the second throttling valve is opened, and the first electric valve 20 corresponding to the indoor heat exchanger requiring refrigeration is controlled to be in the second state, at this time, the cooling and heating type multi-connected heat pump is successfully switched to the cooling and heating combined supply mode. However, the state of the refrigerant after the mode switching may not be able to meet the refrigeration or heating demand. When the first temperature difference is less than or equal to the first preset temperature, for example, the first temperature difference is less than or equal to 2 degrees Celsius, the opening degree of the third throttling valve is reduced by 5 steps every 1 min, so that more refrigerant flows into the indoor unit, until the set condition is met.

[0141] In some embodiments, after the step of switching the cooling and heating type multi-connected heat pump from the single-warming mode to the cooling and heating combined supply mode, the following steps are further included:

[0142] obtaining the total heating capacity and the total cooling capacity of the cooling and heating type multi-connected heat pump, and obtaining the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating.

[0143] determining the corresponding saturated temperature according to the exhaust pressure, and calculating a second temperature difference between the saturated temperature and the ambient temperature.

[0144] when the second temperature difference is greater than or equal to a second preset temperature, the second electric valve is controlled to be in the condenser state.

[0145] It can be understood that when the refrigeration demand is more than the heating demand, the heat exchanger area for heat dissipation is too small for the system, at this time, the second electric valve is switched to the condenser mode when the temperature difference between the saturation temperature corresponding to the set exhaust pressure and the ring temperature or water temperature of the indoor heat exchanger for heating is greater than 7℃, at this time, the third check valve 23 is locked and the third throttling valve 22 loses effect.

[0146] When the heating capacity is greater than the cooling capacity, the system needs to absorb additional heat through the outdoor heat exchanger 21, at this time, since the outdoor heat exchanger 21 is in the condenser mode, it is still heat dissipation, and the load of the indoor heat exchanger 10 being refrigerated as an evaporator is small, for the system, it is equivalent to insufficient evaporator area, which will cause the suction pressure to be too low, and when the temperature difference between the saturation temperature corresponding to the set suction pressure and the evaporation temperature is greater than 10℃, the second electric valve is triggered to switch to the evaporator state again.

[0147] In the heating priority mode, the system heating capacity is greater than the cooling capacity by default, the outdoor heat exchanger is in the evaporator mode by default, and the frequency control of the compressor and the outdoor fan is constrained by the heating capacity.

[0148] In the refrigeration priority mode, when the first indoor heat exchanger starts the cooling mode, the second electric valve is interlocked to start the condenser mode, at this time, the second throttling valve is opened, and an initial opening degree is set according to the number of indoor heat exchangers for refrigeration, when the cooling and heating modes of the subsequently opened indoor heat exchangers are the same, the system will maintain the existing mode, at this time, it is the conventional refrigeration mode.

[0149] When one or more heating units start the heating mode, the corresponding electric valve acts, the heating capacity is less than the cooling capacity, and the outdoor heat exchanger is always maintained in the condenser mode, when the heating capacity is greater than the cooling capacity, the evaporating pressure is reduced, and the outdoor heat exchanger is switched to the evaporator mode.

[0150] In the refrigeration priority mode, the system refrigeration capacity is greater than the heating capacity by default, the outdoor heat exchanger is in the condenser mode by default, and the frequency control of the compressor and the outdoor heat exchanger fan is constrained by the refrigeration capacity.

[0151] The control logic of the first throttling valve 16 of the enthalpy increasing system is the same as that of the conventional air energy heat pump system, and the frequency control logic of the compressor 18 and the fan is the same as that of the conventional air energy heat pump system, and the present application will not be described in detail.

[0152] According to the control device of the cold and warm type multi-connected heat pump provided by the third aspect of the present application, please refer to Figure 4 , which comprises:

[0153] The acquisition module 301 is configured to acquire the working mode of the cold and warm type multi-connected heat pump.

[0154] The control module 302 is configured to control the first electric valve corresponding to the heat supply indoor heat exchanger to be in a first state, and control the first electric valve corresponding to the cold supply indoor heat exchanger to be in a second state, and control the first throttling valve and the second throttling valve to be opened when the working mode is the cold and heat supply mode.

[0155] It should be noted that the steps S200 to S210 and other steps are only for convenient description, and do not constitute a time sequence limitation of each step in the control method of the cold and heat type multi-connected heat pump. Moreover, some contents are described in detail in the control method of the cold and heat type multi-connected heat pump provided in the first aspect, and all the contents in the control method of the cold and heat type multi-connected heat pump can also be applicable to the control device of the cold and heat type multi-connected heat pump provided in the third aspect, and then the contents are not described in detail in the control device of the cold and heat type multi-connected heat pump provided in the third aspect in order to avoid repetition. Similarly, the contents in the above two aspects can be used to explain the contents of all the following aspects, and therefore the repeated contents are not described in the following aspects. The technical effects of the control device of the cold and heat type multi-connected heat pump provided in the embodiments of the present application correspond to the technical effects of the control method of the cold and heat type multi-connected heat pump, and therefore the technical effects are not described herein.

[0156] According to the electronic device provided in the fourth aspect of the present application, the memory, the processor and the computer program stored in the memory and executable on the processor are included, and the processor executes the program to realize the steps of the control method of the cold and heat type multi-connected heat pump provided in the third aspect of the present application.

[0157] Figure 5 An example of an entity structure diagram of an electronic device is shown, which can include a processor 810, a communications interface 820, a memory 830 and a communications bus 840, wherein the processor 810, the communications interface 820 and the memory 830 complete mutual communication through the communications bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the cold and heat type multi-connected heat pump, which includes: acquiring a working mode of the cold and heat type multi-connected heat pump; when the working mode is a cold and heat supply mode, controlling a first electric valve corresponding to a heat supply indoor heat exchanger to be in a first state, and controlling a first electric valve corresponding to a cold supply indoor heat exchanger to be in a second state, and controlling a first throttling valve and a second throttling valve to be opened.

[0158] In addition, the logic instructions in the memory 830 described above can be implemented in the form of software functional units and sold or used as independent products, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0159] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement without creative labor.

[0160] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be implemented by means of software and the necessary general hardware platform, and of course can also be implemented by hardware. Based on such understanding, the above technical solutions essentially or the parts that contribute to the prior art can be embodied in the form of a software product. The computer software product can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0161] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cold and warm type multi-connected heat pump, characterized by, Comprise: A plurality of indoor heat exchangers arranged in parallel; A first header and a second header arranged side by side, a first check valve is arranged between the outlet of each indoor heat exchanger and the first header, a second check valve is arranged between the second header and the outlet of each indoor heat exchanger; A heat exchanger, a first heat exchange inlet of the heat exchanger is communicated with the first header, a first heat exchange outlet of the heat exchanger is communicated with the second header and a second heat exchange inlet of the heat exchanger; A first throttling valve arranged at the second heat exchange inlet; A second throttling valve arranged between the second header and the first heat exchange outlet of the heat exchanger; A compressor, a suction port of the compressor is communicated with the second heat exchange outlet of the heat exchanger; A third header communicated with the suction port of the compressor; A plurality of first electric valves, a plurality of the first electric valves are arranged one-to-one corresponding to a plurality of the indoor heat exchangers, the first electric valve is used to adjust the communication state of the inlet of the indoor heat exchanger, the exhaust port of the compressor and the third header.

2. The cooling and heating multi-connected heat pump according to claim 1, characterized by, Each of the first electric valves is communicated with the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor and the third header, each of the first electric valves comprises a first state, a second state and a third state; In the first state, the inlet of the corresponding indoor heat exchanger is communicated with the exhaust port of the compressor; In the second state, the inlet of the corresponding indoor heat exchanger is communicated with the third header; In the third state, neither the exhaust port of the compressor nor the third header is communicated with the inlet of the indoor heat exchanger.

3. The cooling and heating type multi-connected heat pump according to claim 2, wherein Further comprising: An outdoor heat exchanger, an inlet of the outdoor heat exchanger is communicated with the first heat exchange outlet of the heat exchanger; A third throttling valve arranged at the inlet of the outdoor heat exchanger; A third check valve arranged between the third throttling valve and the inlet of the outdoor heat exchanger, the third check valve is conducted to the inlet of the outdoor heat exchanger; A fourth check valve arranged between the inlet of the outdoor heat exchanger and the first heat exchange inlet of the heat exchanger, the fourth check valve is conducted to the first heat exchange inlet; A second electric valve communicated with the outlet of the outdoor heat exchanger, the suction port of the compressor and the exhaust port of the compressor, the second electric valve comprises a condenser state, an evaporator state and a closed state; In the condenser state, the outlet of the outdoor heat exchanger is communicated with the exhaust port of the compressor; In the evaporator state, the outlet of the outdoor heat exchanger is communicated with the suction port of the compressor; In the closed state, neither the suction port of the compressor nor the exhaust port of the compressor is communicated with the outlet of the outdoor heat exchanger.

4. The cooling and heating type multi-connected heat pump according to claim 3, wherein Further comprising: A low-pressure sensor arranged at the suction port of the compressor; A high-pressure sensor arranged at the exhaust port of the compressor.

5. The cooling and heating type multi-connected heat pump according to claim 3, wherein Further comprising: A first temperature sensor arranged at one end of the second header close to the first heat exchange outlet; A second temperature sensor arranged at one end of the third header close to the suction port of the compressor.

6. A control method of a cold and warm multi-connected heat pump as claimed in any one of claims 2 to 5, characterized by, Comprise: Obtaining the working mode of the cold and warm multi-connected heat pump; When the working mode is the cold and warm combined supply mode, the first electric valve corresponding to the indoor heat exchanger for heating is in the first state, the first electric valve corresponding to the indoor heat exchanger for cooling is in the second state, and the first throttling valve and the second throttling valve are controlled to be open.

7. The control method of a cold and warm multi-split heat pump according to claim 6, characterized by, When the working mode is the cold and warm combined supply mode, the method further comprises: obtaining the total heating capacity and the total cooling capacity of the cold and warm multi-connected heat pump; when the total heating capacity is greater than the total cooling capacity, controlling the second electric valve to be in the evaporator state and controlling the third throttling valve to be open; when the total heating capacity is less than the total cooling capacity, controlling the second electric valve to be in the condenser state; when the total heating capacity is equal to the total cooling capacity, controlling the second electric valve to be in the closed state.

8. The control method of a cold and warm multi-split heat pump according to claim 7, characterized by, The step of obtaining the total heating capacity and the total cooling capacity of the cold and warm multi-connected heat pump further comprises: adjusting the wind speed of the outdoor fan according to the difference between the total heating capacity and the total cooling capacity.

9. The control method of a cold and warm multi-split heat pump according to claim 6, characterized by, The step of obtaining the working mode of the cold and warm multi-connected heat pump further comprises: when the working mode is the single warm mode, controlling the first electric valve corresponding to the indoor heat exchanger for heating to be in the first state, controlling the second electric valve to be in the evaporator state, and controlling the third throttling valve to be open; when the working mode is the single cold mode, controlling the first electric valve corresponding to the indoor heat exchanger for cooling to be in the second state, controlling the second electric valve to be in the condenser state, and controlling the second throttling valve to be open.

10. The control method of a cold and warm multi-split heat pump according to claim 9, characterized in that, When the cold and warm multi-connected heat pump switches from the single warm mode to the cold and warm combined supply mode, the method comprises: controlling the second throttling valve to be in an initial opening degree, and obtaining a first temperature difference between a second temperature and a first temperature; controlling the opening degree of the third throttling valve according to the first temperature difference and a preset condition; wherein the preset condition comprises: the first temperature difference is less than or equal to a first preset temperature.

11. The control method of a cold and warm multi-split heat pump according to claim 10, characterized in that, The step of switching the cold and warm multi-connected heat pump from the single warm mode to the cold and warm combined supply mode further comprises: obtaining the total heating capacity and the total cooling capacity of the cold and warm multi-connected heat pump, and obtaining the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating; determining a corresponding saturation temperature according to the exhaust pressure, and calculating a second temperature difference between the saturation temperature and the ambient temperature; when the second temperature difference is greater than or equal to a second preset temperature, controlling the second electric valve to be in the condenser state.

12. A control device of a cold and warm multi-connected heat pump, characterized by, The control method of the cold and warm multi-connected heat pump according to any one of claims 6 to 11 comprises: an obtaining module configured to obtain the working mode of the cold and warm multi-connected heat pump; a control module configured to, when the working mode is the cold and warm combined supply mode, control the first electric valve corresponding to the indoor heat exchanger for heating to be in the first state, control the first electric valve corresponding to the indoor heat exchanger for cooling to be in the second state, and control the first throttling valve and the second throttling valve to be open.

13. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the steps of the control method of the cold and warm multi-connected heat pump according to any one of claims 6 to 11 when executing the program.

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