Heat pump system and method for controlling heat pump system

Abstract

The invention provides a heat pump system and a control method of the heat pump system, which can avoid discomfort of a user on a utilization side due to defrosting of a heat source side heat exchanger. The heat pump system includes a heat source side unit having a compressor and a heat source side heat exchanger, a water module having a refrigerant-water heat exchanger, at least one floor heating unit, and a control unit, the heat source side heat exchanger and the refrigerant-water heat exchanger being connected by a refrigerant pipe. The refrigerant-water heat exchanger and the floor heating unit are connected by a water pipe, and in the heat source-side defrosting mode, the refrigerant flows through the heat source-side heat exchanger to defrost the heat source-side heat exchanger, and in the heat source-side defrosting mode, the refrigerant flows through the heat source-side heat exchanger to defrost the heat source-side heat exchanger. The control unit controls the refrigerant-water heat exchanger to communicate with at least one fluid in the floor heating unit according to a preset condition and controls the refrigerant to flow between the heat source side heat exchanger and the refrigerant-water heat exchanger.

Description

Technical Field

[0001] The invention relates to a heat pump system and a control method of the heat pump system. Background Art

[0002] A heat pump system is currently widely used, which includes a water circuit and a refrigerant circuit. During the operation of such a heat pump system, the excess heat in the air conditioning operation can be transferred to the water by exchanging heat between the water and the refrigerant. The water that receives the heat is returned through the water pipe and stored in a hot water storage container (for example, a hot water tank).

[0003] On the other hand, in winter, when the heat pump system is often or frequently operated for heating, the heat source side heat exchanger acts as an evaporator of the refrigerant, and the air temperature around it becomes low, which sometimes causes moisture in the air to freeze and adhere to the heat source side heat exchanger and surrounding pipes as frost. As a result, the heat exchange performance of the heat pump system is affected, and even the heat source side heat exchanger and surrounding pipes may be broken.

[0004] Therefore, a defrosting mode is proposed. When this mode is executed, the heat exchanger on the heat source side functions as a condenser of the refrigerant, and the heat exchanger on the utilization side functions as an evaporator of the refrigerant. In this way, the refrigerant flowing through the heat exchanger on the heat source side releases heat and at least partially condenses, and the temperature of the heat exchanger on the heat source side and its surrounding pipes increases, thereby removing frost attached to the heat exchanger on the heat source side.

[0005] However, as described above, during the execution of the defrost mode, since the utilization side heat exchanger functions as an evaporator of the refrigerant, cold air is blown out from the utilization side heat exchanger, causing discomfort to the user. Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] The present invention is made to solve the above-mentioned technical problems, and its object is to provide a heat pump system which can avoid the discomfort caused to the user on the utilization side by defrosting the heat exchanger on the heat source side.

[0008] Technical solutions adopted to solve technical problems

[0009] A first technical solution of the present invention provides a heat pump system, comprising a heat source side unit having a compressor and a heat source side heat exchanger, a water module having a refrigerant-water heat exchanger, at least one floor heating unit and a control unit, wherein the heat source side heat exchanger and the refrigerant-water heat exchanger are connected via a refrigerant piping, and the refrigerant-water heat exchanger and the floor heating unit are connected via a water piping.

[0010] In the heat source side defrost mode, the refrigerant flowing out of the compressor flows through the heat source side heat exchanger to defrost the heat source side heat exchanger, and then returns to the compressor.

[0011] It is characterized in that

[0012] In the heat source side defrost mode, the control unit controls according to preset conditions so that the refrigerant-water heat exchanger is fluidly connected to at least one of the floor heating units and the refrigerant flows between the heat source side heat exchanger and the refrigerant-water heat exchanger.

[0013] Based on the first technical solution, in the heat pump system of the second technical solution, the heat pump system also includes a utilization side unit having a utilization side heat exchanger, and in the heat source side defrost mode, the control unit controls to stop the refrigerant from flowing between the heat source side heat exchanger and the utilization side heat exchanger.

[0014] Based on the first technical solution, in the heat pump system of the third technical solution, the control unit also includes a wire controller, which is communicatively connected to the floor heating unit, and receives a sent mode switching signal, and controls the heat pump system based on the received mode switching signal and according to preset conditions to enable the heat pump system to enter the heat source side defrost mode.

[0015] On the basis of the first technical solution, in the heat pump system of the fourth technical solution, the heat pump system further includes a manifold, the floor heating unit is one, the manifold includes a water port connected to the floor heating unit, and in the heat source side defrosting mode, the control unit opens or closes the water port according to the preset conditions, or

[0016] There are multiple floor heating units, and the manifold includes multiple water ports respectively connected to the multiple floor heating units. In the heat source side defrost mode, the control unit opens and closes the multiple water ports respectively according to the preset conditions.

[0017] On the basis of the third technical solution, in the heat pump system of the fifth technical solution, the preset condition can be set by the wire controller.

[0018] Based on the third technical solution, in the heat pump system of the sixth technical solution, the floor heating unit is arranged in the indoor space, and the preset conditions include whether there is someone in the indoor space. When it is determined that there is someone in the indoor space, the wire controller prevents the floor heating unit arranged in the indoor space with someone from being connected to the refrigerant-water heat exchanger fluid.

[0019] Based on the third technical solution, in the heat pump system of the seventh technical solution, the floor heating unit is arranged in the indoor space, and the preset condition includes whether the temperature of the indoor space is above a specified threshold value. When it is determined that the temperature is below the specified threshold value, the wire controller prevents the floor heating unit arranged in the indoor space from being connected to the refrigerant-water heat exchanger fluid.

[0020] On the basis of the third technical solution, in the heat pump system of the eighth technical solution, the floor heating unit is arranged in the indoor space, and the preset conditions include whether the floor heating unit arranged in the indoor space is working. When it is determined that the floor heating unit arranged in the indoor space is not working, the wire controller makes the floor heating unit arranged in the indoor space connected to the refrigerant-water heat exchanger fluid.

[0021] On the basis of the first technical solution, in the heat pump system of the ninth technical solution, in the heat source side defrost mode, the wired controller can adjust the flow rate of water between the refrigerant-water heat exchanger and the floor heating unit.

[0022] Based on the fourth technical solution, in the heat pump system of the tenth technical solution, in the heat source side defrost mode, the control unit can adjust the opening degree of the water port.

[0023] On the basis of the tenth technical solution, in the heat pump system of the eleventh technical solution, the plurality of floor heating units are respectively arranged in a plurality of indoor spaces, and in the defrost mode on the heat source side, for the adjustable water port, the control unit sets the opening of the water port corresponding to the indoor space with a higher indoor temperature to be larger than the opening of the water port corresponding to the indoor space with a lower indoor temperature.

[0024] On the basis of the first technical solution, in the heat pump system of the twelfth technical solution, the heat pump system also includes a sensing unit, and in the heat source side defrost mode, the sensing unit measures the temperature of the water in the water module, and when the water temperature measured by the sensing unit is lower than a specified temperature threshold, the control unit prevents the heat pump system from executing the heat source side defrost mode or stops the heat source side defrost mode being executed.

[0025] On the basis of the first technical solution, in the heat pump system of the thirteenth technical solution, the heat pump system further includes a sensing unit and a utilization side unit having a utilization side heat exchanger, and in the heat source side defrost mode, the sensing unit measures the temperature of the water in the water module, and when the temperature of the water measured by the sensing unit is lower than a prescribed temperature threshold, the control unit blocks the flow of the refrigerant to the refrigerant-water heat exchanger and makes the refrigerant flow between the heat source side heat exchanger and the utilization side heat exchanger to execute the heat source side defrost mode, or

[0026] When the water temperature measured by the sensing unit is lower than a specified temperature threshold, the control unit stops the execution or operation of the heat source side defrost mode, and when the heat source side heat exchanger is defrosted next time, the flow of the refrigerant to the refrigerant-water heat exchanger is blocked, and the refrigerant flows between the heat source side heat exchanger and the utilization side heat exchanger.

[0027] On the basis of the first technical solution, in the heat pump system of the fourteenth technical solution, the water module further includes a water-side branching pipeline arranged in parallel with the refrigerant-water heat exchanger. The control unit also performs control according to whether the amount of frost on the heat source side heat exchanger reaches or exceeds a prescribed amount. If the amount of frost on the heat source side heat exchanger does not reach or exceeds a prescribed amount, then in the heat source side defrost mode, the control unit performs control in such a manner that water flows only between the refrigerant-water heat exchanger and the water-side branching pipeline and the refrigerant flows between the heat source side heat exchanger and the refrigerant-water heat exchanger.

[0028] The fifteenth technical solution of the present invention provides a control method for a heat pump system, which controls the heat pump system described in any one of the first to fourteenth technical solutions, including: determining the frosting condition of the heat source side heat exchanger; and when it is determined that the heat source side heat exchanger needs to be defrosted, causing the heat pump system to enter the heat source side defrost mode.

[0029] Effects of the Invention

[0030] According to the heat pump system described in the first technical solution, in the defrosting mode, the refrigerant-water heat exchanger is connected to at least one of the floor heating units according to the preset conditions and the refrigerant is controlled to flow between the heat source side heat exchanger and the refrigerant-water heat exchanger; that is, the amount of circulating water involved in defrosting is adjusted according to the preset conditions, and the risk of freezing of the refrigerant-water heat exchanger and its surroundings in the water module can be reduced during defrosting, and the user comfort can be ensured. According to the heat pump system described in the second technical solution, it is possible to avoid the discomfort of indoor personnel caused by the cold air blowing out of the utilization side unit due to the use of the utilization side unit for heat source side defrosting. Specifically, for heat source side defrosting, another way is to use the utilization side heat exchanger for defrosting, or to use the utilization side heat exchanger and the water module for defrosting at the same time. However, in the case of using the utilization side heat exchanger for heat source side defrosting, since the utilization side heat exchanger at this time actually acts as an evaporator of the refrigerant, cold air will be blown into the indoor space during the heat source side defrosting process, which will cause discomfort to indoor personnel. Therefore, in the heat pump system described in the second technical solution, when the heat source side is defrosted, the refrigerant flow between the utilization side heat exchanger and the heat source side heat exchanger is cut off. In this way, during the heat source side defrosting process, cold air can be prevented from blowing out from the utilization side unit, thereby avoiding discomfort to indoor personnel. Moreover, by using water for defrosting, the indoor temperature fluctuates less (the falling speed is slow), ensuring comfort while saving energy.

[0031] According to the heat pump system described in the third technical solution, by providing a wire controller that can communicate with the utilization side unit and the floor heating unit at the same time, the manifold can be flexibly controlled. The construction is simple, and multiple wire controllers are not required. The wire controller is easy to operate.

[0032] According to the heat pump system described in the fourth technical solution, the control unit opens and closes the water port of the manifold according to the preset conditions, so that hot water can be reasonably used for defrosting on the heat source side. In addition, the floor heating unit participating in defrosting can be selected according to actual needs.

[0033] According to the heat pump system described in the fifth technical solution, the preset conditions for determining whether to execute the heat source side defrost mode can be conveniently set according to the actual needs of the user.

[0034] According to the heat pump system described in the sixth to eighth technical solutions, by determining whether the indoor space is being used by someone, the following situation can be avoided: the floor heating unit installed in the indoor space that is being used by someone is used for defrosting on the heat source side, which will cause the floor heating unit's heating capacity toward the indoor space to decrease, causing the indoor temperature to drop, thereby causing the user to feel uncomfortable.

[0035] According to the heat pump system described in the ninth and tenth technical solutions, it is possible to use a reasonable amount of hot water to perform defrosting on the heat source side.

[0036] According to the heat pump system described in the eleventh technical solution, the amount of hot water used for defrosting on the heat source side can be reasonably allocated according to the surplus capacity of each heating space, and the excessive reduction in the heating capacity of individual floor heating units to the indoor space can be avoided.

[0037] According to the heat pump system described in the twelfth technical solution, when the water temperature in the water module is lower than the specified threshold temperature, it means that the desired heat source side defrosting cannot be achieved using hot water. At this time, if the heat source side defrosting is continued, the floor heating unit will lose a large amount of heating capacity to the room, thereby causing the room temperature to drop. Therefore, when the water temperature in the water module is lower than the specified threshold temperature, the above situation can be avoided by stopping the execution of the heat source side defrosting mode.

[0038] According to the heat pump system described in the thirteenth technical solution, it is possible to achieve defrosting on the heat source side when the defrosting capacity on the heat source side based on the floor heating unit is insufficient.

[0039] According to the heat pump system described in the fourteenth technical solution, when the amount of frost on the heat exchanger on the heat source side is not large, a small amount of hot water can be used to achieve defrosting action, and freezing in the water module can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a partial circuit diagram of a heat pump system according to an embodiment of the present invention, showing two utilization-side units and two floor heating units, and showing a situation in which the utilization-side units are connected in series with the floor heating units relative to the heat source-side heat exchanger.

[0041] Figure 2 Yes means Figure 1 Schematic diagram of signal transmission of the heat pump system with the structure shown.

[0042] Figure 3 It is in single floor heating mode Figure 1 Schematic diagram of the flow of refrigerant and water in the heat pump system shown.

[0043] Figure 4 It is in the mixed mode of heating and floor heating. Figure 1 Schematic diagram of the flow of refrigerant and water in the heat pump system shown.

[0044] Figure 5 It is in the heat source side defrost mode Figure 1 Schematic diagram of the flow of refrigerant and water in the heat pump system shown.

[0045] Explanation of symbols

[0046] S Heat Pump System

[0047] 100 Heat source side unit

[0048] 110 Compressor

[0049] 120 Four-way reversing valve

[0050] a First port

[0051] b Second port

[0052] c Third port

[0053] d Fourth port

[0054] 130 Heat exchanger on heat source side

[0055] 140 Gas-Liquid Separator

[0056] 150 Heat source side expansion valve

[0057] 160 Auxiliary heat exchanger

[0058] 170 Heat source side branch pipeline

[0059] 180 Branch side expansion valve

[0060] 190 Heat source side air supply mechanism

[0061] Pi Inflow side refrigerant pipe

[0062] Po Outflow side refrigerant pipe

[0063] P1 First piping

[0064] P2 Second piping

[0065] VC1 Liquid side refrigerant stop valve

[0066] VC2 Gas side refrigerant stop valve

[0067] LP liquid side refrigerant header

[0068] GP Gas side refrigerant header

[0069] 200A First Floor Heating Unit

[0070] 210A First floor heating pipe component

[0071] 220A First water outflow pipe on the floor heating side

[0072] 230A First water inflow pipe on the floor heating side

[0073] 200B Second floor heating unit

[0074] 210B Second floor heating pipe component

[0075] 220B Second water outflow pipe on the floor heating side

[0076] 230B Second water inflow pipe on the floor heating side

[0077] 200C Third floor heating unit

[0078] 210C Third floor heating pipe component

[0079] 220C Third water outflow pipe on the floor heating side

[0080] 230C Third water inflow pipe on the floor heating side

[0081] 300A First utilization side unit

[0082] 310A First liquid side refrigerant pipe

[0083] 320A First gas side refrigerant pipe

[0084] 330A First utilization side heat exchanger

[0085] 340A First utilization side air supply mechanism

[0086] 350A First utilization side expansion valve

[0087] 300B Second utilization side unit

[0088] 310B Second liquid side refrigerant pipe

[0089] 320B Second gas side refrigerant pipe

[0090] 330B Second utilization side heat exchanger

[0091] 340B Second utilization side air supply mechanism

[0092] 350B Second utilization side expansion valve

[0093] 300C Third utilization side unit

[0094] 400 Water module

[0095] 410 Refrigerant - water heat exchanger

[0096] 420 Liquid side refrigerant pipe

[0097] 430 Gas side refrigerant pipe

[0098] 440 Inflow side water pipe

[0099] 450 Outflow side water pipe

[0100] 460 Refrigerant side electric valve

[0101] 470 Water side branch pipeline

[0102] 480 Pump mechanism

[0103] 490 Bypass valve

[0104] 500 manifold

[0105] 510 Water distribution unit

[0106] 510S water distribution side main pipe

[0107] 510A The first branch pipe on the water distribution side

[0108] 510B Second branch pipe on water diversion side

[0109] 520 Water Collection Unit

[0110] 520S water collection side main pipe

[0111] 520A The first branch pipe on the water collection side

[0112] 520B Second branch pipe on water collection side

[0113] SV Server

[0114] 600A No.1 Wire Controller

[0115] 600B Second wire controller

[0116] 600C Third Line Controller

[0117] 700 Router

[0118] 800 Narrowband IoT Communication Device

[0119] SP1 First Indoor Space

[0120] SP2 Second Indoor Space

[0121] SP3 The third indoor space DETAILED DESCRIPTION

[0122] First, refer to Figure 1 and Figure 2 , the specific structure of the heat pump system S according to one embodiment of the present invention is described.

[0123] like Figure 1 and Figure 2As shown, the heat pump system S of this embodiment includes a heat source side unit 100, a first floor heating unit 200A, a second floor heating unit 200B, and a third floor heating unit 200C ( Figure 2 It is shown in Figure 1 ), the first usage side unit 300A, the second usage side unit 300B, the third usage side unit 300C ( Figure 2 It is shown in Figure 1 ) and water module 400.

[0124] like Figure 1As shown, the heat source side unit 100 includes a compressor 110, a four-way reversing valve 120, a heat source side heat exchanger 130, a gas-liquid separator 140, a heat source side expansion valve 150, an auxiliary heat exchanger 160, a heat source side branching pipeline 170, a branching side expansion valve 180, a heat source side air supply mechanism 190, an outflow side refrigerant piping Po, an inflow side refrigerant piping Pi, a first piping P1 and a second piping P2, a liquid side refrigerant stop valve VC1, a gas side refrigerant stop valve VC2, etc. The four-way reversing valve 120 has a first port a, a second port b, a third port c, and a fourth port d. The outlet of the compressor 110 is connected to the first port a of the four-way reversing valve 120 via the outflow side refrigerant piping Po, and the inlet of the compressor 11 is connected to the third port c of the four-way reversing valve 120 via the gas-liquid separator 140 and the inflow side refrigerant piping Pi. One end of the heat source side heat exchanger 130 is connected to the fourth port d of the four-way reversing valve 120 via a refrigerant piping, and the other end thereof is connected to one end of the auxiliary heat exchanger 160 via a refrigerant piping. A heat source side air supply mechanism 190 is provided on the upstream side of the air flow of the heat source side heat exchanger 130. A heat source side expansion valve 150 and a heat source side branch pipe 170 are provided in the middle of the refrigerant piping connecting the auxiliary heat exchanger 160 and the heat source side heat exchanger 130. One end of the heat source side branch pipe 170 is connected to the above-mentioned refrigerant piping, and the other end is connected to the middle of the inflow side refrigerant piping Pi. The other end of the auxiliary heat exchanger 160 is connected to the liquid side refrigerant stop valve VC1 via the first piping P1, and the second port b of the four-way reversing valve 120 is connected to the gas side refrigerant stop valve VC2 via the second piping P2. In addition, the above-mentioned first floor heating unit 200A, second floor heating unit 200B, third floor heating unit 200C, first utilization side unit 300A, second utilization side unit 300B and third utilization side unit 300C are connected to the heat source side unit 100 via the liquid side refrigerant main pipe LP and the gas side refrigerant main pipe GP (and via the liquid side refrigerant stop valve VC1 and the gas side refrigerant stop valve VC2). It should be noted that the combination of the above-mentioned components in the heat source side unit 100 is only an example and is not limited to this. Some components can be appropriately omitted and modified according to certain functions. For example, according to actual working conditions, the auxiliary heat exchanger 160, the heat source side branch pipeline 170, the branch side expansion valve 180 and the gas-liquid separator 140 can be omitted. In addition, when the water module 400 and the heat source side unit 100 are separately arranged, the liquid side refrigerant stop valve VC1 and the gas side refrigerant stop valve VC2 are necessary, but when the two are integrally arranged, the above-mentioned stop valves can be omitted. In addition, in this embodiment, the heat source side unit 100 and the water module are arranged in a one-to-one relationship, but the arrangement is not limited to this. For example, there may be a plurality of water modules 400 and a single heat source side unit 100, presenting a many-to-one arrangement relationship.Alternatively, there may be multiple water modules 400 and multiple heat source side units 100, presenting a many-to-many configuration relationship.

[0125] Next, with reference to Figure 1 and 2 , the specific configuration of the water module 400 of this embodiment will be described. As Figure 2 shown, the water module 400 includes a refrigerant-water heat exchanger 410, which is a heat exchanger for heat exchange between the water flowing through the refrigerant-water heat exchanger 410 and the refrigerant flowing through the refrigerant-water heat exchanger 410. It can be seen from this figure that an internal water passage for water flow and an internal refrigerant passage for refrigerant flow are formed inside the refrigerant-water heat exchanger 410. Among them, one end of the internal refrigerant passage is connected to the liquid side refrigerant main pipe LP through the liquid side refrigerant pipe 420, and the other end is connected to the gas side refrigerant main pipe GP through the gas side refrigerant pipe 430. And one end of the internal water passage is connected to the first floor heating unit 200A, the second floor heating unit 200B, and the third floor heating unit 200C through the inflow side water pipe 440, and the other end is connected to the first floor heating unit 200A, the second floor heating unit 200B, and the third floor heating unit 200C through the outflow side water pipe 450. In addition, in this embodiment, a refrigerant side electric valve 460 is provided in the middle of the liquid side refrigerant pipe 420, and a pump mechanism 480 is provided in the middle of the outflow side water pipe 450. In addition, the water module 400 further includes a water side branch pipeline 470 and a bypass valve 490 provided in the middle of the water side branch pipeline 470. The functions of the water side branch pipeline 470 and the bypass valve 490 will be described later.

[0126] Next, similarly with reference to Figure 1 and Figure 2 , the specific configurations of the first floor heating unit 200A, the second floor heating unit 200B, and the third floor heating unit 200C will be described.

[0127] As Figure 1As shown, the first floor heating unit 200A, the second floor heating unit 200B and the third floor heating unit 200C respectively include the first floor heating pipe member 210A, the second floor heating pipe member 210B and the third floor heating pipe member 210C which are arranged under the floors of different indoor spaces. The first floor heating pipe member 210A, the second floor heating pipe member 210B and the third floor heating pipe member 210C respectively have the first floor heating side water outflow pipe 220A, the second floor heating side water outflow pipe 220B and the third floor heating side water outflow pipe 220C connected to the water pipe 440 on the inflow side of the water module 400 via the manifold 500 described later, and the first floor heating side water inflow pipe 230A, the second floor heating side water inflow pipe 230B and the third floor heating side water inflow pipe 230C connected to the water pipe 450 on the outflow side of the water module 400 via the manifold 500 described later.

[0128] In particular, a water collector 500 is provided between the water module 400 and each heating unit. The water collector 500 includes a water collector unit 510 and a water collector unit 520. The water collector unit 510 includes a water collector side main pipe 510S, a first branch pipe 510A on the water collector side, a second branch pipe 510B on the water collector side, and a third branch pipe on the water collector side (not shown). The water collector unit 520 includes a water collector side main pipe 520S, a first branch pipe 520A on the water collector side, a second branch pipe 520B on the water collector side, and a third branch pipe on the water collector side (not shown), and the first branch pipe 520A on the water collector side, the second branch pipe 520B on the water collector side, and the third branch pipe on the water collector side respectively have a first water port, a second water port, and a third water port. The first water port, the second water port, and the third water port are respectively connected to the first water inflow pipe 230A on the floor heating side, the second water inflow pipe 230B on the floor heating side, and the third water inflow pipe 230C on the floor heating side. In addition, the water distribution unit 510 is connected to the outflow side water distribution pipe 450 of the water module 400 through the water distribution side main pipe 510S. The water collection unit 520 is connected to the first water outflow distribution pipe 220A on the floor heating side, the second water outflow distribution pipe 220B on the floor heating side, and the third water outflow distribution pipe 220C on the floor heating side through the first branch pipe 520A on the water collection side, the second branch pipe 520B on the water collection side, and the third branch pipe on the water collection side, and is connected to the inflow side water distribution pipe 440 of the water module 400 through the water collection side main pipe 520S. In addition, the first branch pipe 510A on the water distribution side, the second branch pipe 510B on the water distribution side, and the third branch pipe on the water distribution side are respectively provided with an on-off valve. By opening and closing these on-off valves, it is possible to adjust whether water circulates between the water module 400 and the corresponding floor heating unit. In addition, preferably, the on-off valve is a valve capable of adjusting the opening degree, and by adjusting the opening degree of these valves, the flow rate of water between the water module 400 and the floor heating unit can be controlled. It should be noted that the water module 400 includes a control unit (not shown) for opening and closing each on-off valve or adjusting the opening degree of each on-off valve, and the control unit controls each on-off valve based on a control instruction sent from a wire controller described later.

[0129] Generally speaking, after the temperature of the indoor space reaches the target temperature, the on-off valves of each water-dividing side branch pipe are all closed. If the on-off valves of each water-dividing side branch pipe of the manifold 500 are all closed, water will no longer flow between the water module 400 and all floor heating units. As a result, water outage abnormality will occur, which will cause the pressure difference in the water piping to increase. In order to avoid this situation, a water-side branch pipe 470 is arranged in parallel with the refrigerant-water heat exchanger 410, and a bypass valve 490 is arranged on the water-side branch pipe 470. When the pressure difference in the water piping exceeds a certain value, the bypass valve 490 opens, allowing water to flow between the water-side two-branch pipe 470 and the refrigerant-water heat exchanger 410, thereby reducing the pressure difference.

[0130] However, if the heat pump system uses hot water to perform the heat source side defrosting mode to remove the frost attached to the heat source side heat exchanger 130, then, since the on-off valves of each water port are all closed, the amount of hot water flowing between the bypass branch line 470 and the refrigerant-water heat exchanger 410 is small, so the water temperature tends to drop rapidly during the defrosting process. As a result, there is a risk of freezing (the refrigerant-water heat exchanger 410 and its surrounding components) in the water module 400. From this point of view, in order to reduce the risk of freezing, when defrosting the heat source side heat exchanger 130, it is necessary to increase the amount of hot water.

[0131] Next, refer to Figure 1 and Figure 2 , the specific configurations of the first usage side unit 300A, the second usage side unit 300B, and the third usage side unit 300C in this embodiment are described. Since the first usage side unit 300A, the second usage side unit 300B, and the third usage side unit 300C have the same configuration in this embodiment, only the first usage side unit 300A is used as an example for description. As for the components of the second usage side unit 300B and the third usage side unit 300C corresponding to the first usage side unit 300A, the suffix letters are replaced from A to B and C, and their descriptions are omitted.

[0132] like Figure 1As shown, the first utilization side unit 300A is arranged in the first indoor space SP1 together with the first floor heating unit 200A, and includes a first liquid side refrigerant piping 310A connected to the liquid side refrigerant main pipe LP, a first gas side refrigerant piping 320A connected to the gas side refrigerant main pipe GP, a first utilization side heat exchanger 330A, a first utilization side air supply mechanism 340A, and a first utilization side expansion valve 350A. One end of the first utilization side heat exchanger 330A is connected to the first gas side refrigerant piping 320A, and the other end is connected to the first liquid side refrigerant piping 310A. The first utilization side expansion valve 350A is arranged in the middle of the first liquid side refrigerant piping 310A. The first utilization side air supply mechanism 340A is arranged on the upstream side of the air flow than the first utilization side heat exchanger 330A.

[0133] Next, refer to Figure 2 , the signal transmission between the components in the heat pump system of this embodiment is described.

[0134] Figure 2The first use side unit 300A, the second use side unit 300B, the third use side unit 300C, and the first floor heating unit 200A, the second floor heating unit 200B, and the third floor heating unit 200C are shown as being arranged in different indoor spaces of a certain residence. Specifically, the first use side unit 300A and the first floor heating unit 200A are arranged in the first bedroom, i.e., the first indoor space SP1, the second use side unit 300B and the second floor heating unit 200B are arranged in the living room, i.e., the second indoor space SP2, and the third use side unit 300C and the third floor heating unit 200C are arranged in the second bedroom, i.e., the third indoor space SP3. In addition, the first wire controller 600A, the second wire controller 600B, and the third wire controller 600C are arranged in the bedroom, the living room, and the bedroom, respectively. As the first communication line, the heat source side unit 100 is connected to each of the utilization side units 300A, 300B, and 300C so as to be communicable, each of the utilization side units 300A, 300B, and 300C is connected to each of the wire controllers 600A, 600B, and 600C so as to be communicable, and each of the wire controllers 600A, 600B, and 600C is connected to the manifold 500 so as to be communicable. Specifically, the control substrate of the heat source side unit 100 and each of the control substrates of the utilization side units 300A, 300B, and 300C can communicate with each other. In the present embodiment, the control substrate of the heat source side unit 100 at least determines whether to execute the heat source side defrosting mode. When it is determined that the heat source side defrost mode is to be executed, the control substrate of the heat source side unit 100 generates a mode switching signal (here, the heat source side defrost mode switching signal, i.e., a signal for switching the heat pump system to or executing the heat source side defrost mode) and sends the mode switching signal to the control substrates of each utilization side unit 300A, 300B, 300C in a wired or wireless manner. After receiving the above-mentioned mode switching signal, the control substrates of each utilization side unit 300A, 300B, 300C forward the mode switching signal to each wire controller 600A, 600B, 600C in a wireless or wired manner. After receiving the mode switching signal, each wire controller 600A, 600B, 600C adjusts each on-off valve corresponding to each water port according to a preset condition set in advance, so that the heat pump system executes the heat source side defrost mode or switches to the heat source side defrost mode.

[0135] The pre-set conditions include but are not limited to the following:

[0136] Whether there are people in the indoor space;

[0137] Whether the room temperature of the indoor space is above a prescribed threshold; and

[0138] Whether the floor heating unit installed in the indoor space is working.

[0139] According to different preset conditions and corresponding determination results, the operations performed by each wire controller 600A, 600B, 600C are also different.

[0140] In the case where the preset condition is whether there is someone in the indoor space, if it is determined that there is someone in the indoor space, then the wire controller set in the indoor space sets the corresponding on-off valve to be closed, or the on-off valve is originally in a closed state, and the wire controller maintains the on-off valve in a closed state. In this way, hot water will not flow between the floor heating unit set in the indoor space and the refrigerant-water heat exchanger 410 of the water module 400. As a result, the heat originally used for heating the indoor space will not be lost. For example, when it is determined that the first bedroom and the second bedroom are unoccupied and the living room is occupied, the wire controller set in the living room, that is, the second wire controller 600B, checks the state of the on-off valve of the second water-dividing side branch pipe 510B. If the on-off valve is in an open state, the second wire controller 600B sends a command to the control unit of the water module 400 to close the on-off valve. If the on-off valve is in a closed state, the on-off valve is maintained in a closed state. As for whether the opening and closing valves of the first water-dividing side branch pipe 510A and the third water-dividing side branch pipe are closed or whether the opening needs to be adjusted, specific settings can be made according to the defrosting situation. As for how to judge whether there is someone in the indoor space, for example, it can be judged according to the state of the wire controller set in the indoor space. If the wire controller is in working state, it can be considered that there are people in the indoor space. For another example, a well-known human detection sensor can be directly used to determine whether there are people in the indoor space. For another example, a sensor other than a human detection sensor (for example, a heat sensor) can also be used to determine whether there are people in the indoor space. Generally speaking, when there are people in the indoor space, it is not desired that the floor heating unit loses heat and causes the room temperature to drop, thereby causing discomfort to the indoor people. To this end, by judging whether there are people in the indoor space as a preset condition, the above situation can be avoided.

[0141] In the case where the preset condition is whether the room temperature of the indoor space is above a predetermined threshold value, if it is determined that the room temperature of the indoor space is below the predetermined threshold value, the wire controller provided in the indoor space sets the corresponding on-off valve to be closed, or if the on-off valve is originally in a closed state, the wire controller maintains the on-off valve in a closed state. In this way, hot water will not flow between the floor heating unit provided in the indoor space and the refrigerant-water heat exchanger 410 of the water module 400. As a result, the heat originally used for heating the indoor space will not be lost, thereby preventing the room temperature from dropping. For example, when it is determined that the room temperature of the first bedroom and the second bedroom is below the predetermined threshold and the room temperature of the living room is above the predetermined threshold, the first wire controller 600A installed in the first bedroom and the third wire controller 600C installed in the bedroom B check the opening and closing valves of the first water-dividing side branch pipe 510A and the third water-dividing side branch pipe, respectively, and if they are in the open state, send instructions to the control unit of the water module 400 to close the opening and closing valves, and if they are in the closed state, maintain the opening and closing valves in the closed state. On the other hand, since the room temperature of the living room is above the predetermined threshold, the second wire controller 600B installed in the living room sends instructions to the control unit of the water module 400 to open the opening and closing valve of the second water-dividing side branch pipe 510B, or when the opening and closing valve of the second water-dividing side branch pipe 510B is in the open state, maintain the opening and closing valve in the open state.

[0142] In the case where the preset condition is whether the floor heating unit provided in the indoor space is working, if it is determined that the floor heating unit provided in the indoor space is not working at present, then the wired controller provided in the indoor space opens the corresponding on-off valve, or when the on-off valve is originally in an open state, the on-off valve is maintained in an open state. In this way, hot water flows between the floor heating unit provided in the indoor space and the refrigerant-water heat exchanger 410 of the water module 400. Thus, the heat source side heat exchanger 130 can be defrosted by using the hot water heated by the floor heating unit.

[0143] It should be noted that in the above example, the case of opening and closing the on-off valve is described. However, in the case where the opening of the on-off valve can be adjusted, in addition to opening and closing the on-off valve, the opening of the on-off valve can also be adjusted according to the specific situation of defrosting. In addition, when it is determined that the number of floor heating units that can be used for defrosting on the heat source side is two or more, it is preferred to set the opening of the water port corresponding to the indoor space with a higher room temperature to be larger than the opening of the water port corresponding to the indoor space with a lower room temperature. In this way, the floor heating units can be used more evenly to perform the task of defrosting on the heat source side.

[0144] As the second communication line, the mode switching signal can be sent to each wire controller through remote control. Figure 2 As shown, a router 700 and a narrowband Internet of Things (NB-IoT) communication device 800 are provided indoors, and the narrowband Internet of Things communication device 800 is communicatively connected to the control substrates of each utilization side unit 300A, 300B, and 300C. When the user's smart terminal is connected to the router 700, the user can use the APP matched with the heat pump system to control the local area network, and transmit the mode switching instruction (here, it refers to the heat source side defrost mode switching signal, that is, the instruction for switching the heat pump system to or executing the heat source side defrost mode) to the narrowband Internet of Things communication device 800 via the router 700. The subsequent signal transmission and control method are basically the same as those described above, so repeated description is omitted here.

[0145] As a third communication line, the user can connect the smart terminal to the Internet, send the mode switching command to the router 700 installed indoors through the Internet, and then send it to the narrowband Internet of Things communication device 800 through the router 700. However, as explained above, the router 700 is not an essential component, and the user can enable the smart terminal to communicate directly with the narrowband Internet of Things communication device 800 via the Internet.

[0146] As a fourth communication line, the heat source side unit 100 (control substrate), the router 700 and / or the narrowband Internet of Things communication device 800 can be connected to the server SV via the Internet. Generally speaking, if a mode switching instruction is sent to the heat pump system via the user's smart terminal to perform heat source side defrosting, the user needs to personally confirm the frosting condition of the heat source side heat exchanger 130, and even if the confirmation is performed in person, there is a case of misunderstanding. For this reason, when the user sends a mode switching instruction through the APP, the instruction is first sent to the server SV via the Internet. Since the heat source side unit 100 is communicatively connected to the server SV, information indicating the frosting condition of the heat source side heat exchanger 130 is sent and stored in the server SV. When receiving the mode switching instruction, the server SV checks the frosting condition of the heat source side heat exchanger 130 for the most recent time. If the server SV determines that the heat source side defrosting mode does not need to be executed based on the frosting condition, the mode switching signal is not sent to the router 700 and / or the narrowband Internet of Things communication device 800, otherwise, the mode switching signal is sent. This can save the user's time and prevent unnecessary defrosting operations on the heat source side.

[0147] Next, refer to Figure 3 , the separate floor heating mode executed by the heat pump system of this embodiment is described.

[0148] like Figure 3As shown, when the single floor heating mode is to be executed, the first utilization side expansion valve 350A, the second utilization side expansion valve 350B and the third utilization side expansion valve (not shown) are closed so that the refrigerant does not flow between each utilization side heat exchanger and the heat source side heat exchanger 130. At the same time, the refrigerant side electric valve 460 in the water module 400 is opened so that the refrigerant can flow between the refrigerant internal passage of the refrigerant-water heat exchanger 410 and the heat source side heat exchanger 130. In addition, according to the indoor space that needs to be heated by floor heating, the opening and closing of the opening and closing valve of the corresponding water port is adjusted. For example, in this example, the first indoor space SP1 and the second indoor space SP2 need to be heated by floor heating. For this purpose, the first wire controller 600A and the second wire controller 600B set in the first indoor space SP1 and the second indoor space SP2 open or adjust the opening and closing valves of the first water distribution side branch pipe 510A and the second water distribution side branch pipe 510B to the required opening, and operate the pump mechanism 480. On the refrigerant circuit side, high-temperature and high-pressure gaseous refrigerant flows out from the outlet of the compressor and flows to the gas-side refrigerant main pipe GP via the outlet-side refrigerant piping Po, the first port a of the four-way reversing valve 120, the second port b, the second piping P2 and the gas-side shut-off valve VC2. Then, the high-temperature and high-pressure gaseous refrigerant flows to the refrigerant internal passage in the refrigerant-water heat exchanger 410 via the gas-side refrigerant piping 430. At the same time, on the water circuit side, under the operation of the pump mechanism 480, the water in each water piping and the floor heating pipe component flows to the water internal passage in the refrigerant-water heat exchanger 410 via the inlet-side water piping 440. At this time, in the refrigerant-water heat exchanger 410, the flow direction of water and the flow direction of refrigerant are opposite, and heat exchange is performed between the two. The high-temperature and high-pressure gaseous refrigerant transfers heat to the water and condenses into a liquid phase or a gas-liquid two-phase refrigerant, and the water obtains heat and becomes hot water with a higher temperature. Next, on the refrigerant circuit side, the liquid phase or gas-liquid two-phase refrigerant flows to the liquid side refrigerant main pipe LP via the liquid side refrigerant piping 420, and then flows to the heat source side heat exchanger 130 via the liquid side stop valve VC1, the first piping P1, the auxiliary heat exchanger 160, and the heat source side expansion valve 150, and in the heat source side heat exchanger 130, it exchanges heat with the air flow delivered by the heat source side air supply mechanism 190 to evaporate into a gaseous refrigerant, and then flows into the compressor 110 via the third port c, the fourth port d, the inlet side refrigerant piping Pi and the special separator 140.At the same time, on the water circuit side, the hot water with increased temperature flows out from the water internal passage to the outflow side water pipe 450, and flows through the water distribution side main pipe 510S, the first water distribution side branch pipe 510A with the opening and closing valve opened, the second water distribution side branch pipe 510B, and the first water inflow pipe 230A and the second water inflow pipe 230B on the floor heating side to the first floor heating pipe member 210A of the first floor heating unit 200A and the second floor heating pipe member 210B of the second floor heating unit 200B. In this way, the hot water is supplied to the first indoor space SP1 and the second indoor space SP2 through the pipe surfaces of each heating pipe member.

[0149] Next, refer to Figure 4 , the heating and floor heating mixed mode executed by the heat pump system of this embodiment is explained.

[0150] The difference from the above-mentioned single floor heating mode is that the heating floor heating mixed mode is a mode in which the utilization side unit and the floor heating unit are used for heating at the same time. In this mode, according to the indoor space that needs to perform the heating floor heating mixed mode, the utilization side expansion valve in the utilization side unit set in the indoor space and the water port of the manifold 500 corresponding to the floor heating unit set in the indoor space are opened or adjusted to the required opening degree. For example, in this example, the first indoor space SP1 is expected to perform the heating floor heating mixed mode, and the second indoor space SP2 and the third indoor space SP3 do not need to be heated. In this case, the opening and closing valve of the first water-dividing side branch pipe 510A is opened, the first utilization side expansion valve 350A is opened, and the opening and closing valves of the second water-dividing side branch pipe 510B and the third water-dividing side branch pipe are closed, and the second utilization side expansion valve 350B and the third utilization side expansion valve are closed. In this mode, a part of the refrigerant flowing in the gas-side refrigerant main pipe GP flows into the refrigerant-water heat exchanger 410 of the water module 400 as described above, and the other part flows into the first utilization-side heat exchanger 330A via the first gas-side refrigerant piping 320A. In the first utilization-side heat exchanger 330A, this part of the refrigerant exchanges heat with the air flow sent by the first utilization-side air supply mechanism 340A and condenses into a liquid or gas-liquid two-phase refrigerant, and the heated air becomes hot air and is supplied to the first indoor space SP1. On the other hand, the floor heating based on the first floor heating unit 200A has been described in detail above, and repeated description is omitted here.

[0151] The basics of heat source side defrosting will be described below.

[0152] Since the heat pump system frequently performs heating-related operations, the heat source side heat exchanger often functions as an evaporator of the refrigerant. Therefore, after the refrigerant evaporates, the temperature of the heat source side heat exchanger and its surroundings will decrease, resulting in the formation of frost, which will adhere to the heat source side heat exchanger and its surrounding components. Therefore, in order to avoid failures caused by frosting, defrosting of the heat source side is required. Generally speaking, there are two ways to defrost the heat source side heat exchanger. One is to perform heat source side defrosting by using the side unit, and the other is to perform heat source side defrosting by using the water module. When performing heat source side defrosting by using the side unit, the defrosting speed is fast, but since the side unit functions as an evaporator of the refrigerant during the execution of heat source side defrosting, cold air will be blown into the room, resulting in large fluctuations in the indoor temperature and poor comfort. When performing heat source side defrosting by using the water module, although the defrosting speed is slower than that of the side unit, the indoor temperature fluctuation is smaller and the comfort is better.

[0153] Generally speaking, when the room temperature of each indoor space reaches the target temperature, the water ports corresponding to each floor heating unit will be closed. Therefore, hot water will not flow between the water module and each floor heating unit. However, in this way, water cut-off abnormalities will occur and a large pressure difference will be induced. For this reason, as described above, a bypass pipeline and a bypass valve are usually provided in the water module. When all water ports are closed, the bypass valve is opened so that hot water can flow between the refrigerant-water heat exchanger and the bypass pipeline, thereby reducing the pressure difference. However, if only the water module is used for heat source side defrosting, since the amount of hot water flowing between the refrigerant-water heat exchanger and the bypass pipeline is small, when only using this hot water to defrost the heat source side heat exchanger, the temperature of this hot water is likely to decrease rapidly, resulting in the risk of freezing of the refrigerant-water heat exchanger due to too low water temperature. In order to avoid the above situation, in the present embodiment, the following heat source side defrosting mode is performed Figure 5 as shown below.

[0154] Next, with reference to Figure 5 , the heat source side defrosting mode executed by the heat pump system of the present embodiment will be described. It should be noted that Figure 5 the heat source side defrosting mode shown is only an example executed based on a certain preset condition and is not limited thereto. More specifically, in Figure 5 , the heat source side defrosting mode is executed with whether the room temperature is a threshold value, specifically above 25°C, as the preset condition. In addition, for the sake of easy understanding and description, in Figure 5 , the situation in the third indoor space SP3 is ignored, and only the first indoor space SP1 and the second indoor space SP2 are described.

[0155] As shown in Figure 5As shown, at this time, the room temperature of the first indoor space SP1 is 18°C, and the room temperature of the second indoor space SP2 is 29°C. It can be seen that the room temperature of the first indoor space SP1 is lower than the threshold temperature, i.e., 25°C, and the room temperature of the second indoor space SP2 is higher than the threshold temperature, i.e., 25°C. In addition, at this time, the bypass valve 490 can be set to an open state or a closed state. On the other hand, the control substrate in the heat source side unit 100 determines that a certain amount of frost has been attached to its heat source side heat exchanger 130, and it is necessary to execute the heat source side defrosting mode. To this end, the control substrate of the heat source side unit 100 sends a mode switching signal (i.e., a heat source side defrosting mode switching signal) to the first usage side unit 300A and the second usage side unit 300B (of course, there is also the third usage side unit 300C, which is omitted here for the sake of convenience). The mode switching signal is sent to the control substrates of the first usage side unit 100A and the second usage side unit 100B, and further sent to the first wire controller 600A and the second wire controller 600B via the control substrates of the first usage side unit 100A and the second usage side unit 100B. The first wire controller 600A and the second wire controller 600B respectively open and close the opening and closing valves of the first water-dividing side branch pipe 510A and the second water-dividing side branch pipe 510B according to the above-mentioned preset conditions, i.e., whether the room temperature of the indoor space is above the threshold value, or not. As described above, since the room temperature of the first indoor space SP1 is lower than the threshold temperature, i.e., 25°C, the first wired controller 600A closes or maintains the on-off valve of the first water-dividing side branch pipe 510A in a closed state, and closes the first utilization side expansion valve 350A. On the other hand, since the room temperature of the second indoor space SP2 is higher than the threshold temperature, i.e., 25°C, the second wired controller 600B opens or maintains the on-off valve of the second water-dividing side branch pipe 510B in an open state, and closes the second utilization side expansion valve 350B. At this time, the refrigerant does not flow between each utilization side heat exchanger and the heat source side heat exchanger 130. Moreover, water circulates only between the water module 400, the second floor heating unit 200B, and the heat source side unit 100. Specifically, on the refrigerant circuit side, the high-temperature and high-pressure gaseous refrigerant flows out from the outlet of the compressor 110, and flows to the heat source side heat exchanger 130 through the outflow side refrigerant piping Po, the first port a, and the fourth port d of the four-way reversing valve 120. In the heat source side heat exchanger 130, the high temperature and high pressure other refrigerant exchanges heat with the air flow sent by the heat source side air supply mechanism 190 and condenses into a liquid or gas-liquid two-phase refrigerant, so that the temperature of the heat source side heat exchanger 130 and its surroundings increases, and the frost attached to the heat source side heat exchanger 130 and its surrounding components melts. Then, the condensed refrigerant flows to the liquid side refrigerant header LP through the heat source side expansion valve 150, the auxiliary heat exchanger 160, the first pipe P1 and the liquid side stop valve VC1.Then, the refrigerant flows to the refrigerant internal passage in the refrigerant-water heat exchanger 410 via the liquid-side refrigerant piping 420. At the same time, on the water circuit side, the hot water in the second floor heating unit 200B flows to the inlet-side water piping 440 via the second floor heating-side water outflow piping 220B and the second water-dividing-side branch pipe 510B whose on-off valve is in an open state, and further flows into the water internal passage in the refrigerant-water heat exchanger 41. In the refrigerant-water heat exchanger 410, the flow direction of the hot water and the flow direction of the refrigerant are relative, and heat is exchanged between the two. Specifically, heat is transferred from the hot water to the refrigerant. In this way, in the process of defrosting the heat source-side heat exchanger 130, sufficient heat can be provided, and at the same time, the room temperature of the indoor space will not drop too much, causing discomfort to the indoor personnel. In addition, since the heat source side defrosting is not performed by the utilization side unit, it is possible to prevent the cold air from blowing out from the utilization side unit during the execution of the heat source side defrosting mode, causing discomfort to the indoor personnel. In particular, in the existing heat pump system that uses hot water for defrosting the heat source side, the on-off valves corresponding to each heating unit are closed, and in order to prevent cold air from blowing out from the utilization side unit, the utilization side expansion valve of each utilization side unit is also closed. In this way, only the hot water flowing in the water side branch pipe 470 is used for defrosting on the heat source side. However, as described above, since the amount of hot water flowing in the water side branch pipe 470 is small, during the process of performing the heat source side defrosting action, the temperature of the hot water flowing in the water side branch pipe 470 tends to drop rapidly, and there is a risk of causing the refrigerant-water heat exchanger 410 to freeze. For this reason, in this embodiment, in order to avoid the occurrence of the above-mentioned risks, the hot water in the floor heating unit with additional heating capacity is utilized and used for defrosting on the heat source side. In this way, a sufficient amount of hot water can be provided during the process of performing the heat source side defrosting action. However, in this embodiment, preferably, each wire controller (or other parts of the control unit other than the wire controller, such as the control substrate of the heat source side unit 100) can also be controlled according to whether the amount of frost on the heat source side heat exchanger 130 reaches or exceeds the specified amount. Specifically, if the amount of frost on the heat source side heat exchanger 130 does not reach or exceed the specified amount, then in the above-mentioned heat source side defrosting mode, each wire controller controls to close all the on-off valves so that water flows only between the refrigerant-water heat exchanger and the water side branch pipeline. In this way, since the amount of frost on the heat source side heat exchanger 130 is small, even if only a small amount of hot water is used, it is possible to prevent freezing while achieving defrosting on the heat source side.

[0156] The above description is directed to the case of a heat pump system having a plurality of floor heating units respectively arranged in a plurality of indoor units, but the number of floor heating units is not limited to a plurality. For example, in a heat pump system, there is only one floor heating unit, and the water module and the floor heating unit are in a one-to-one relationship. In particular, when the water module and the floor heating unit are arranged in a one-to-one manner, in addition to the wired controller, the supply of hot water to the floor heating can also be controlled by the room thermostat.

[0157] In addition, regarding the termination condition of the heat source side defrost mode, for example, it may be whether the water temperature of the hot water in the water module is lower than the specified water temperature threshold. If the water temperature of the hot water in the water module is lower than the specified water temperature threshold, it means that it is essentially impossible to achieve heat source side defrost using only hot water, and there may even be a risk of freezing of the refrigerant-water heat exchanger 410. In this case, the wire controller prevents the heat pump system from executing the heat source side defrost mode or stops the heat source side defrost mode that is being executed. It should be noted that the water temperature in the water module can be measured by a sensing unit (not shown) provided in the heat pump system.

[0158] Further, preferably, as a subsequent control after the heat source side defrosting mode ends, when the heat source side heat exchanger 130 is defrosted next time, the flow of refrigerant between the heat source side unit 100 and the water module 400 is blocked (i.e., the refrigerant side electric valve 460 is closed), and part or all of the utilization side expansion valves in the utilization side unit are opened, so that the heat source side is defrosted by the utilization side unit. In this way, although cold air is blown out from the utilization side unit, the heat source side can be defrosted.

[0159] In addition, in this embodiment, the opening and closing of each opening and closing valve of the manifold 500 is controlled by a wire controller, but the invention is not limited thereto. Alternatively, the control unit of the water module 400 is communicatively connected to the control unit of the manifold 500, and the control unit of the water module 400 receives a mode switching signal from the heat source side unit 100 to open and close each opening and closing valve of the manifold 500.

[0160] In addition, it should be noted that the control substrate of the heat source side unit 100, the control substrates of each utilization side unit, the control unit of the water module 400, the control unit of the manifold 500, and each wire controller constitute a control unit of the heat pump system. As long as the functions expected to be achieved in this embodiment can be achieved, each function can be appropriately configured in each component of the control unit.

[0161] In addition, in this embodiment, a wire controller is respectively provided for each indoor space, but the arrangement is not limited thereto. For example, all the utilization side units and the floor heating units may also share one wire controller.

[0162] In addition, in this embodiment, the heat pump system is a two-pipe system, but is not limited thereto and is also applicable to a three-pipe heat pump system, where the outdoor unit is connected to the three-pipe indoor unit via a liquid pipe, a high-low pressure pipe, and a gas pipe. The indoor unit can switch between heating and cooling, for example.

[0163] In addition, the present invention provides a control method for the aforementioned heat pump system, which controls the heat pump system described in any of the aforementioned technical solutions, including: determining the frosting condition of the heat source side heat exchanger; and when it is determined that the heat source side heat exchanger needs to be defrosted, causing the heat pump system to enter the heat source side defrost mode.

[0164] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A heat pump system, comprising a heat source side unit having a compressor and a heat source side heat exchanger, a water module having a refrigerant-water heat exchanger, at least one floor heating unit and a control unit, wherein the heat source side heat exchanger and the refrigerant-water heat exchanger are connected via a refrigerant piping, and the refrigerant-water heat exchanger and the floor heating unit are connected via a water piping, In the heat source side defrost mode, the refrigerant flowing out of the compressor flows through the heat source side heat exchanger to defrost the heat source side heat exchanger, and then returns to the compressor. It is characterized in that In the heat source side defrost mode, the control unit controls according to preset conditions so that the refrigerant-water heat exchanger is fluidly connected to at least one of the floor heating units and the refrigerant flows between the heat source side heat exchanger and the refrigerant-water heat exchanger.

2. The heat pump system according to claim 1, It is characterized in that The heat pump system further includes a utilization side unit having a utilization side heat exchanger. In the heat source side defrost mode, the control unit performs control to stop the flow of the refrigerant between the heat source side heat exchanger and the utilization side heat exchanger.

3. The heat pump system according to claim 1, It is characterized in that The control unit further includes a wire controller, which is communicatively connected to the floor heating unit. The wire controller receives the sent mode switching signal, and performs control based on the received mode switching signal and according to the preset conditions, so that the heat pump system enters the heat source side defrosting mode.

4. The heat pump system according to claim 1, It is characterized in that The heat pump system further comprises a manifold. The floor heating unit is one, The manifold comprises a water port connected to the floor heating unit. In the heat source side defrosting mode, the control unit opens or closes the water port according to the preset conditions, or The floor heating unit has multiple The manifold comprises a plurality of water ports respectively connected to the plurality of floor heating units. When switching to or executing the heat source side defrosting mode, the control unit opens and closes the plurality of water ports respectively according to the preset conditions.

5. The heat pump system according to claim 3, It is characterized in that The preset condition can be set via the wire controller.

6. The heat pump system according to claim 3, It is characterized in that The floor heating unit is arranged in the indoor space. The preset conditions include whether there are people in the indoor space, When it is determined that there is someone in the indoor space, the wired controller disconnects the floor heating unit provided in the indoor space where there is someone and the refrigerant-water heat exchanger from fluid communication.

7. The heat pump system according to claim 3, It is characterized in that The floor heating unit is arranged in the indoor space. The preset condition includes whether the temperature of the indoor space is above a predetermined threshold value. When it is determined that the temperature is equal to or lower than a predetermined threshold value, the remote controller disconnects the floor heating unit installed in the indoor space from fluid communication with the refrigerant-water heat exchanger.

8. The heat pump system according to claim 3, It is characterized in that The floor heating unit is arranged in the indoor space. The preset conditions include whether the floor heating unit installed in the indoor space is working. When it is determined that the floor heating unit installed in the indoor space is not operating, the remote controller allows the floor heating unit installed in the indoor space to be in fluid communication with the refrigerant-water heat exchanger.

9. The heat pump system according to claim 1, It is characterized in that In the heat source side defrost mode, the control unit can adjust the flow rate of water between the refrigerant-water heat exchanger and the floor heating unit.

10. The heat pump system according to claim 4, It is characterized in that In the heat source side defrost mode, the control unit can adjust the opening degree of the water port.

11. The heat pump system according to claim 10, It is characterized in that The plurality of floor heating units are respectively arranged in a plurality of indoor spaces. In the heat source side defrost mode, for the adjustable water port, the control unit sets the opening of the water port corresponding to the indoor space with a higher indoor temperature to be larger than the opening of the water port corresponding to the indoor space with a lower indoor temperature.

12. The heat pump system according to claim 1, It is characterized in that The heat pump system further comprises a sensing unit, In the heat source side defrosting mode, the sensing unit measures the temperature of water in the water module. When the temperature of the water measured by the sensing unit is lower than a predetermined temperature threshold, the control unit causes the heat pump system not to execute a heat source side defrost mode or stops the heat source side defrost mode being executed.

13. The heat pump system according to claim 1, It is characterized in that The heat pump system further includes a sensing unit and a utilization-side unit having a utilization-side heat exchanger. In the heat source side defrosting mode, the sensing unit measures the temperature of water in the water module. When the temperature of the water measured by the sensing unit is lower than a predetermined temperature threshold, the control unit blocks the flow of the refrigerant to the refrigerant-water heat exchanger and causes the refrigerant to flow between the heat source side heat exchanger and the utilization side heat exchanger to execute the heat source side defrosting mode, or When the water temperature measured by the sensing unit is lower than a specified temperature threshold, the control unit stops the heat source side defrost mode, and when the heat source side heat exchanger is defrosted next time, the flow of the refrigerant to the refrigerant-water heat exchanger is blocked, and the refrigerant flows between the heat source side heat exchanger and the utilization side heat exchanger.

14. The heat pump system according to claim 1, It is characterized in that The water module also includes a water-side branch pipeline arranged in parallel with the refrigerant-water heat exchanger. The control unit further performs control according to whether the amount of frost on the heat source side heat exchanger reaches or exceeds a predetermined amount. If the amount of frost on the heat source side heat exchanger does not reach a specified amount or more, then in the heat source side defrost mode, the control unit controls the heat source side in such a way that water flows only between the refrigerant-water heat exchanger and the water side branch pipe and the refrigerant flows between the heat source side heat exchanger and the refrigerant-water heat exchanger.

15. A method for controlling a heat pump system, comprising controlling the heat pump system according to any one of claims 1 to 14, It is characterized in that include: Determining the frosting condition of the heat exchanger on the heat source side; as well as When it is determined that the heat source side heat exchanger needs to be defrosted, the heat pump system is caused to enter the heat source side defrost mode.

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