JP6467271B2 - Hot water heating system - Google Patents

Description

  The present invention relates to a hot water heating system capable of performing heating using hot water exchanged with a heat pump device.

  Conventionally, in this type of system, there has been a system in which a plurality of heat exchange terminals (heat radiating terminals) are connected to a water heat exchanger of an outdoor unit (see, for example, Patent Document 1). In this system, during the heating operation, hot water generated in the water heat exchanger by the refrigerant from the heat pump device is supplied to each heat radiating terminal via the introduction pipe. At this time, a thermal valve is installed in each of the introduction pipes to each heat radiation terminal, and the heat radiation temperature of each heat radiation terminal is adjusted by appropriately controlling the opening and closing of each introduction pipe by the thermal valve. Is done.

JP2013-217522A

  As a heat exchange terminal connected to the water heat exchanger of the outdoor unit, a plurality of floor heating panels, heating panels and the like are connected to a plurality of rooms, and a remote control device is provided in each room, by the thermal valve, Select operation / stop, set temperature, etc. individually. In the winter when the temperature is low, the outdoor heat exchanger becomes cold and moisture in the air passing through the heat exchanger adheres to the heat exchanger to generate frost, and the heat exchange performance decreases as the frost develops. Therefore, when the condition that frost has adhered to the heat exchanger is reached to some extent, the refrigerant circulation direction of the refrigeration circuit of the heat pump device is reversed, etc., and the defrosting operation is periodically performed to heat the outdoor heat exchanger and melt the frost. However, during this defrosting operation, the water heat exchanger is at a low temperature, so that the heating operation is stopped and the room temperature is lowered to impair comfortable heating. It is necessary to prevent heat from being taken away from the room being heated.

In order to solve the above problem, in claim 1 of the present invention, a heat pump device including a compressor, an expansion valve, and an air heat exchanger, and supply of a refrigerant from the heat pump device to exchange heat with water. Heating is performed by radiating heat to indoor air using the outdoor unit having a water heat exchanger that generates hot water, and the hot water generated by the water heat exchanger of the outdoor unit and supplied via the introduction pipe. In addition, a plurality of heat exchange terminals that recirculate the hot water after the heat radiation to the water heat exchanger of the outdoor unit through a lead-out conduit using a circulation pump, and individual heat corresponding to the plurality of heat exchange terminals A valve, a remote control device that individually controls the operating states of the plurality of heat exchange terminals in a predetermined control mode, and an outdoor unit that controls the compressor, the expansion valve, the thermal valve, and the like according to commands from the remote control device Temperature with controller In the heating system, during the defrosting operation of the outdoor unit, the thermal valve corresponding to the currently operating heat exchange terminal among the plurality of heat exchange terminals is closed and currently stopped among the plurality of heat exchange terminals. heat exchange-out the Netsudoben corresponding to the terminal open in the case the all of the plurality of heat exchange terminal is currently in operation, open all Netsudoben corresponding to the plurality of heat exchange device, defrost It has a control means.

Further, in claim 2, a heat pump device including a compressor, an expansion valve, and an air heat exchanger, and a water heat exchanger that receives supply of refrigerant from the heat pump device and generates hot water by heat exchange with water, An outdoor unit having heat and the warm water generated by the water heat exchanger of the outdoor unit and supplied via the introduction pipe line to heat the indoor side by heat radiation and derive the warm water after the heat radiation A plurality of heat exchange terminals that are recirculated by a circulation pump to the water heat exchanger of the outdoor unit through a pipe line, individual thermal valves corresponding to the plurality of heat exchange terminals, and the plurality of heat exchanges In a hot water heating system having a remote control device that individually controls the operating state of a terminal in a predetermined control mode, and an outdoor control unit that controls the compressor, the expansion valve, the thermal valve, and the like according to a command from the remote control device The above During the defrosting operation of the outer unit, the thermal valve corresponding to the currently stopped heat exchange terminal among the plurality of heat exchange terminals is opened, and the heat exchange terminal currently operating among the plurality of heat exchange terminals is opened. A defrosting control unit that closes the corresponding thermal valve, opens the thermal valve corresponding to the currently stopped heat exchange terminal among the plurality of heat exchange terminals, and increases the rotational speed of the circulation pump; Is.

  In Claim 1 of this invention, with respect to the water heat exchanger of an outdoor unit, each of a some heat exchange terminal is connected via an introductory conduit and a derivation | leading-out pipeline, and a warm water heating system is constructed | assembled. When the heating operation is performed at the heat exchange terminal, the hot water generated in the water heat exchanger by the refrigerant from the heat pump device is supplied to the heat exchange terminal via the introduction pipe line. In the defrosting operation, the temperature of the water heat exchanger and the hot water is decreased in order to heat the outdoor heat exchanger.

  In the hot water heating system according to claim 1, the heat valve corresponding to the currently operating heat exchange terminal among the plurality of heat exchange terminals is closed, and the currently stopped heat exchange terminal among the plurality of heat exchange terminals is supported. By opening the thermal valve that does not flow, cold water with reduced temperature does not flow to the heat exchange terminal that is currently in heating operation. improves. In addition, by flowing cold water whose temperature has been lowered to the currently stopped heat exchange terminal, heat can be absorbed from the room where heating is stopped and the defrosting operation can be completed in a short time, further improving the comfort of heating operation. To do.

According to claim 1, when all of the plurality of heat exchange terminals are currently in operation, the heat valves corresponding to the plurality of heat exchange terminals are opened to absorb heat almost uniformly from all the rooms. And the fall of the room temperature in each room can be moderated, and the fall of the comfort of heating operation can be moderated.

Further, according to claim 2 , by increasing the number of rotations of the circulation pump during the defrosting operation, and flowing the cold water whose temperature has further decreased to the heat exchange terminal that is currently stopped, The heat can be absorbed and the defrosting operation can be completed in a shorter time, and the comfort of the heating operation is further improved.

The figure which shows the whole schematic structure of the hot-water cooling / heating system of one Embodiment of this invention. Schematic representation of the refrigeration cycle during defrosting / heating operation of the outdoor unit Table showing the open / close state of the thermal valve for each pattern of the control mode of the heat exchange terminal Flow chart showing the control procedure

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  The whole schematic structure of the hot water heating system of this embodiment is shown in FIG. In FIG. 1, this hot water heating system 100 includes an outdoor unit 1 that is installed outdoors, and a plurality of heat units that are installed indoors by being connected to the outdoor unit 1 via a hot water forward pipe 2 and a hot water return pipe 3. And an exchange terminal (in this example, a heating panel 51, a heating panel 52, and a floor heating panel 53).

  In this example, the heating panel 51 is arranged in the A room among the three-room structure consisting of the A room, the B room, and the C room, the heating panel 52 is arranged in the B room, and the floor heating. The panel 53 is disposed in the C chamber. At this time, one forward header 91 is provided in the middle of the warm water outgoing pipe 2 extending from the outdoor unit 1, and the upstream side portion of the warm water outgoing pipe 2 from the forward header 91 is one common outgoing pipe 2A. The hot water from the outdoor unit 1 is supplied. The downstream portion of the warm water forward pipe 2 from the forward header 91 includes an outgoing pipe 2B1 to the heating panel 51, an outgoing pipe 2B2 to the heating panel 52, and an outgoing pipe 2B3 to the floor heating panel 53. And is divided. The common forward pipe 2A and the forward pipe 2B1 correspond to the introduction pipe line to the heating panel 51, and the common forward pipe 2A and the forward pipe 2B2 correspond to the introduction pipe line to the heating panel 52, The common forward pipe 2 </ b> A and the forward pipe 2 </ b> B <b> 3 correspond to introduction pipes to the floor heating panel 53. Similarly, one return header 92 is provided in the middle of the hot water return pipe 3 extending to the outdoor unit 1, and a portion of the hot water return pipe 3 upstream from the return header 92 is connected to the heating panel 51. Return pipe 3B1, a return pipe 3B2 from the heating panel 52, and a return pipe 3B3 from the floor heating panel 53. A portion of the hot water return pipe 3 downstream from the return header 92 is configured as one common return pipe 3A, and the hot water introduced through the return pipes 3B1, 3B2, and 3B3 is returned to the outdoor unit 1. . The common return pipe 3A and the return pipe 3B1 correspond to the lead-out pipe line from the heating panel 51, and the common return pipe 3A and the return pipe 3B2 correspond to the lead-out pipe line from the heating panel 52, The common return pipe 3 </ b> A and the return pipe 3 </ b> B <b> 3 correspond to a lead-out pipe line from the floor heating panel 53.

  The forward pipe 2B1 to the heating panel 51, the forward pipe 2B2 to the heating panel 52, and the forward pipe 2B3 to the floor heating panel 53 are each forward pipe by a drive signal from a thermal valve controller CV. Thermally operated valves V1, V2, V3 that can be opened and closed are respectively provided. In this example, the room A is provided with a main remote controller RM for performing a heat radiation (heating) operation of the heating panel 51 and a heat radiation (heating) operation of the heating panel 52 and the floor heating panel 53. The room B is provided with a terminal remote controller RA for performing a heat radiation (heating) operation of the heating panel 52, and the room C is provided with a heat radiation (heating) operation of the floor heating panel 53. A terminal remote control device RB is provided for performing the above.

  A control signal SS1 output in response to an operation on the main remote controller RM is input to an outdoor unit controller (described later) that controls the outdoor unit 1, and is thereby supplied to the common forward pipe 2A. The flow rate and temperature of the heated water are controlled, and the control signal SS2 is output from the outdoor unit controller to the thermal valve controller CV in response to this, and the thermal valve controller CV outputs the control signal accordingly. The opening / closing operations of the thermal valves V1, V2, V3 are controlled by the control signals S1, S2, S3. Accordingly, by appropriately operating the main remote controller RM, the operation states of the heating panel 51, the heating panel 52, and the floor heating panel 53 can be collectively controlled (hereinafter, as appropriate) The control mode is referred to as “collective control”). Further, the control signal Sa output in response to the operation on the terminal remote controller RA is input to the thermal valve controller CV, and in response to the control signal S2 output from the thermal valve controller CV. The opening / closing operation of the thermal valve V2 is controlled. Accordingly, the operating state of the heating panel 52 can be individually controlled by appropriately operating the terminal remote controller RA (hereinafter, such a control mode is referred to as “individual control” as appropriate). Further, the control signal Sb output in response to the operation on the terminal remote control device RB is input to the thermal valve controller CV, and in response to the control signal S3 output from the thermal valve controller CV. The opening / closing operation of the thermal valve V3 is controlled. Thereby, the operating state of the floor heating panel 53 can be individually controlled by appropriately operating the terminal remote control device RB.

  Next, a schematic system configuration of the outdoor unit 1 is shown in FIG. In FIG. 2A, the outdoor unit 1 includes a refrigerant circulation circuit 21 that circulates a synthetic compound gas such as HFC as a refrigerant to absorb and release heat outside the room, and circulates, for example, an antifreeze liquid as hot water to exchange the heat. A hot water circulation circuit 22 (consisting of the hot water outlet pipe 2 and the hot water return pipe 3) for radiating heat at a terminal (in the example, three of the heating panel 51, the heating panel 52, and the floor heating panel 53); Heat exchange between the two.

  That is, the refrigerant circulation circuit 21 performs heat exchange between the refrigerant and the outside air, which is provided in the outdoor unit 1 and switches the four-way valve 6 that switches the circulation direction of the refrigerant, the compressor 7 that compresses the refrigerant, and the like. Heat exchange between the refrigerant and the hot water circulating through the outdoor heat exchanger 8 (corresponding to an air heat exchanger), an expansion valve 9 for decompressing and expanding the refrigerant, the hot water outlet pipe 2 and the hot water return pipe 3 is performed. A water / refrigerant heat exchanger 11 (corresponding to a water heat exchanger) to be performed is connected by a refrigerant pipe 15. The four-way valve 6, the compressor 7, the outdoor heat exchanger 8, and the expansion valve 9 that are connected to each other through the refrigerant pipe 15 constitute a heat pump device. Further, an outdoor fan 10 for blowing air to the outdoor heat exchanger 8 is further provided.

  The four-way valve 6 is a valve having four ports. For each of two ports for the refrigerant main path 15a (which constitutes a part of the refrigerant pipe 15), a part of the refrigerant pipe 15 is provided. Configure) Switch which of the two ports for the other refrigerant sub-path 15b is connected. The two ports for the refrigerant sub-path 15b are connected by a refrigerant sub-path 15b arranged in a loop, and the compressor 7 is provided on the refrigerant sub-path 15b.

  The compressor 7 pressurizes the refrigerant in a low-pressure gas state to be in a high-pressure gas state, and also functions as a pump for circulating the refrigerant in the entire refrigerant pipe 15 in the outdoor unit 1.

  The two ports for the refrigerant main path 15a of the four-way valve 6 are connected by the refrigerant main path 15a arranged in a loop shape, and the outdoor heat exchanger 8, The expansion valve 9 and the water-refrigerant exchanger 11 are provided in this order (in the example shown in FIG. 2A, in the order of the counterclockwise refrigerant main path 15a).

  The outdoor heat exchanger 8 functions as a condenser that radiates the heat of the refrigerant and condenses it into a liquid state when the temperature of the refrigerant in the gas state passing through the interior of the outdoor heat exchanger 8 is higher than the outdoor outside air temperature. Further, when the temperature of the refrigerant in the liquid state passing through the interior is lower than the outdoor outside air temperature, the refrigerant functions as an evaporator that absorbs the heat of the outside air into the refrigerant and evaporates it into a gas state (FIG. 2B described later). reference).

  The outdoor fan 10 improves the performance of the outdoor heat exchanger 8 by sending air to the outdoor heat exchanger 8.

  The expansion valve 9 functions to decompress and expand the refrigerant in a high-pressure liquid state to a low-pressure liquid state.

  As described above, the water-refrigerant heat exchanger 11 is connected to the refrigerant main path 15a and allows the refrigerant to pass through it, and is also connected to the cold / hot water return pipe 2 and the cold / hot water return pipe 3 so as to have the inside thereof. Allow warm water to pass through. When the temperature of the liquid refrigerant passing through the water-refrigerant heat exchanger 11 is lower than the temperature of the hot water, the refrigerant functions as an evaporator that absorbs the heat of the cold / hot water and evaporates it into a gas state. Moreover, when the temperature of the gaseous refrigerant passing through the inside of the water-refrigerant heat exchanger 11 is higher than the temperature of the cold / hot water, the condenser radiates the heat to the cold / hot water and condenses it into a liquid state. It functions (see FIG. 2B described later).

  On the other hand, the hot water circulation circuit 22 includes the water-refrigerant heat exchanger 11, a circulation pump 12 that applies a circulation pressure to the hot water, a cistern tank 13, and the plurality of heat exchange terminals provided in the outdoor unit 1. (In the above example, the heating panel 51, the heating panel 52, and the floor heating panel 53) are connected by the hot water outlet pipe 2 and the hot water return pipe 3.

  The water-refrigerant heat exchanger 11 is connected to the hot water return pipe 2 and the hot water return pipe 3, and the cistern tank 13 and the circulation pump 12 are provided on the hot water return pipe 3.

  The cistern tank 13 separates bubbles generated in the hot water by cavitation or the like (air / water separation function), absorbs the hot / warm water in the hot water circulation circuit 22 and supplies cold / hot water.

  The circulation pump 12 functions to circulate hot water throughout the hot water forward pipe 2 and the hot water return pipe 3.

  At this time, the outdoor unit 1 includes an outdoor unit control unit CU as a defrosting control unit that controls the outdoor unit 1. This outdoor unit control unit is mainly composed of a microcomputer including a CPU, a ROM, a RAM, etc., and controls the entire outdoor unit 1 based on the control signal SS1 from the main remote controller RM, and corresponds to it. The control signal SS2 is output to the thermal valve controller CV.

  In the refrigerant circulation circuit 21 configured as described above, the compressor 7 circulates the refrigerant in one direction on the refrigerant sub-path 15b, and controls the circulation direction of the refrigerant on the refrigerant main path 15a by switching the four-way valve 6. To do. FIG. 2A shows the circulation direction during the defrosting operation, and the high-temperature refrigerant discharged from the compressor 7 flows in the order of the outdoor heat exchanger 8, the expansion valve 9, and the water-refrigerant heat exchanger 11. To do. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 7 to become high temperature and high pressure gas, it adheres to the surface in the outdoor heat exchanger 8 (functioning as a condenser). Melt the frost. At this time, the air blown by the outdoor fan 10 is controlled in accordance with the outside air temperature, and changes into a high-pressure liquid while releasing heat to the outside air. The refrigerant that has become liquid in this manner is decompressed by the expansion valve 9 to become a low-pressure liquid that is easily evaporated. Thereafter, the low-pressure liquid evaporates in the water-refrigerant heat exchanger 11 (functions as an evaporator) and changes into gas, thereby absorbing heat from the cold water from the hot water return pipe 3. The refrigerant then returns to the compressor 7 again as a low-temperature and low-pressure gas.

  At this time, the cold water cooled by the water-refrigerant heat exchanger 11 as described above is transferred from the hot water outlet pipe 2 to the currently operating heat exchange terminal (in the above example, the heating panel 51, the heating panel 52, the floor). Of the three heating panels 53), they are not supplied to the heating panel 51 but are supplied to the heating panel 52 and the floor heating panel 53, which are the heat exchange terminals that are currently stopped, from the indoor air that is stopped from heating. After absorbing heat, it passes through the cistern tank 13 and returns to the circulation pump 12 again. By performing heat exchange between the refrigeration cycle of the refrigerant circulation circuit 21 and the hot water circulation circuit 22 as described above, a defrosting operation for melting frost adhering to the surface of the outdoor heat exchanger 8 is performed.

  On the other hand, FIG. 2B shows the circulation direction during the heating operation, and the refrigerant discharged from the compressor 7 flows in the order of the water-refrigerant heat exchanger 11, the expansion valve 9, and the outdoor heat exchanger 8. Thereby, after the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 7 to become high temperature and high pressure gas, the hot water is supplied in the water-refrigerant heat exchanger 11 (functioning as a condenser). It changes into a high-pressure liquid while releasing heat into the warm water from the return pipe 3. The refrigerant that has become liquid in this manner is decompressed by the expansion valve 9 to become a low-pressure liquid that is easily evaporated. Thereafter, the low-pressure liquid evaporates in the outdoor heat exchanger 8 (functions as an evaporator) and changes into gas, thereby absorbing heat from the outside air. The refrigerant then returns to the compressor 7 again as a low-temperature and low-pressure gas.

  At this time, the hot water heated by the water-refrigerant heat exchanger 11 as described above is supplied from the hot water outlet pipe 2 to the plurality of heat exchange terminals (in the above example, the heating panel 51, the heating panel 52, the floor heating panel). 53), the heat is radiated to the room air to heat the room, and then passes through the cistern tank 13 and returns to the circulation pump 12 again. By performing heat exchange between the refrigeration cycle of the refrigerant circuit 21 and the hot water circuit 22 as described above, a heating operation for raising the temperature of the indoor air is performed.

  Next, the main remote controller RM can display the operation state and various setting states of the plurality of heat exchange terminals (in the example shown in FIG. 1, the heating panel 51, the heating panel 52, and the floor heating panel 53). Display unit (not shown), a “power” button (not shown) for turning on / off the main remote control device RM itself, and “operation” for instructing the start of operation of the heat exchange terminal A number of operation buttons such as a button (not shown) and a “timer” button (not shown) for instructing the heat exchange terminal to operate by a timer are provided. Although not shown, the remote controller RM incorporates a CPU as a calculation unit, a memory as a storage unit, and the like for performing various displays.

  As described above, FIG. 3 shows a pattern representing the open / closed state of individual thermal valves corresponding to individual terminals.

  In the configuration shown in FIG. 3 (a), room A indicates that the heating operation is performed with a circle, room B and room C indicate that the operation is stopped, and the thermal valve V1 in the room A is during the heating operation. The hot water produced by the outdoor unit 1 is circulated to the heating panel 51 of the A room and the A room is heated. When frost adheres to the outdoor heat exchanger 8 and the defrosting operation is performed, the thermal valve V1 of the A room is closed, and hot water whose temperature has decreased due to the defrosting operation flows, so that the room temperature of the A room To prevent the decrease. On the other hand, during the defrosting operation, the thermal valves V2 and V3 in the B room and the C room that are stopped are opened, and the time for the defrosting operation is shortened by absorbing heat from the heating panel 52 and the floor heating panel 35 that are stopped It is possible to reduce the room temperature drop of the A room due to the defrosting operation by restarting the heating operation of the A room at an early stage. Moreover, by setting the rotational speed of the circulation pump 12 higher than usual during the defrosting operation, it is possible to further promote the heat absorption from the B chamber and the C chamber when the operation is stopped, thereby further shortening the time of the defrosting operation. .

  In the configuration shown in FIG. 3B, the A room and the B room indicate that the heating operation is indicated by a circle, the C room indicates that the operation is stopped by an X mark, and the thermal valves V1 and V2 of the A and B rooms are indicated. During the heating operation, the hot water produced by the outdoor unit 1 is circulated to the heating panels 51 and 52 of the A room and the B room to heat the A room and the B room. When frost adheres to the outdoor heat exchanger 8 and the defrosting operation is performed, the thermal valves V1 and V2 in the A chamber and the B chamber are closed, and hot water whose temperature has decreased due to the defrosting operation flows. This prevents the room temperature of the A room and the B room from lowering. On the other hand, during the defrosting operation, the thermal valve V3 of the C room that is stopped is opened, and the time of the defrosting operation can be shortened by absorbing heat from the floor heating panel 35 that is stopped. By restarting the heating operation of the room at an early stage, the room temperature decrease in the A room and the B room due to the defrosting operation can be extremely reduced. In addition, by setting the rotational speed of the circulation pump 12 higher than usual during the defrosting operation, the heat absorption from the C chamber during the operation stop can be further promoted, and the time for the defrosting operation can be further shortened.

  In the configuration shown in FIG. 3 (C), all of the A room, the B room, and the C room indicate that the heating operation is being performed with a circle, and all the thermal valves V1, V2, and V3 are opened during the heating operation. Hot water produced by the outdoor unit 1 circulates in the heating panels 51 and 52 and the floor heating panel 53 of the A room and the B room, and the C room, and the heating of the A room, the B room, and the C room is performed. When frost adheres to the outdoor heat exchanger 8 and the defrosting operation is performed, all the heat valves V1, V2, and V3 are opened and the hot water whose temperature has decreased due to the defrosting operation is all heat exchange terminals. The room temperature of the A room, the B room, and the C room is gradually reduced gradually and the defrosting operation time is shortened, so that the heating operation of the A room, the B room, and the C room can be performed early. By restarting at the same time, it is possible to reduce the room temperature decrease in the A room, the B room, and the C room due to the defrosting operation.

Next, the operation of the thermal valve corresponding to the heating operation of each room described above will be described with reference to FIG.
First, in S1, the “power” button of the main remote control device RM itself is NO, and the system is on standby, or the heat exchange terminal provided in at least one of the A room, the B room, and the C room is in the heating operation. In S2, the heating valve corresponding to each room opens and closes according to the settings of the remote control devices RM, RA, and RB provided in each room, and the heating operation is continued. In the winter when the outside air temperature is low, frost is generated in the outdoor heat exchanger 8, and the amount of this frost increases, and the defrosting conditions (conditions such as the temperature of the outdoor heat exchanger 8, the outside air temperature, the operation time) in S3. If established, the process proceeds to S4 with Yes, and the four-way valve 6 of the refrigerant circulation circuit 21 is switched to start the defrosting operation.

  In S5, it is determined whether all rooms (all heat exchange terminals) are in operation or whether heating is stopped in some rooms. If no, some rooms are currently heating, and some rooms are not heated, the thermal valve V corresponding to the room (heat exchange terminal) being heated is closed in S6, and the operation is started. The heating valve V corresponding to the stopped room (heat exchange terminal) is opened and the circulating pump 12 is raised to a high speed, so that the hot water whose temperature has decreased due to the defrosting operation flows, so that the current heating operation is being performed. Prevents the room temperature of the room (heat exchange terminal) from dropping. On the other hand, the defrosting operation time can be shortened by absorbing heat from the stopped room (heat exchange terminal), and the room temperature during the defrosting operation can be resumed early by restarting the heating operation of the room during the heating operation. The decrease can be extremely reduced. Further, by setting the rotation speed of the circulation pump 12 higher than usual during the defrosting operation, it is possible to further promote the heat absorption from the room in which the operation is stopped and to further shorten the time for the defrosting operation. If all rooms (all heat exchange terminals) are in operation at S5, the process proceeds to S7 and the thermal valves V corresponding to all rooms (all heat exchange terminals) are opened to perform the defrosting operation. For this reason, the hot water whose temperature has been lowered flows to all the heat exchange terminals, so that the room temperature of all the rooms is lowered substantially uniformly and gradually. Next, if conditions (conditions such as the temperature and operating time of the outdoor heat exchanger 8) that allow the defrosting to proceed and resume the heating operation are established in S8, the four-way valve 6 of the refrigerant circulation circuit 21 is switched in S9. The defrosting operation is terminated, the process returns to S2, the heating operation of the room in which the heating operation was performed before the defrosting operation is resumed, and the heat corresponding to the room (heat exchange terminal) that has been stopped before the defrosting operation Valve V is closed.

  As described above, in the hot water heating system of the present embodiment, the thermal valve corresponding to the currently operating heat exchange terminal among the plurality of heat exchange terminals is closed and currently stopped among the plurality of heat exchange terminals. By opening the thermal valve corresponding to the heat exchange terminal, the cold water whose temperature has decreased does not flow to the heat exchange terminal currently in heating operation, so the room temperature decrease in the room during heating can be moderately suppressed, The comfort of heating operation is improved. In addition, the defrosting operation can be completed in a short time by absorbing heat from the room where the heating is stopped by actively flowing cold water whose temperature has decreased to the heat exchange terminal that is currently stopped. Further improvement.

  In addition, when all of the plurality of heat exchange terminals are currently in operation, by opening all the thermal valves corresponding to the plurality of heat exchange terminals, the heat is absorbed almost uniformly from all the rooms, and the room temperature in each room It is possible to moderate the decrease in the comfort of heating operation.

  Also, by increasing the number of rotations of the circulation pump during the defrosting operation and flowing cold water whose temperature has further decreased more actively to the heat exchange terminal that is currently stopped, heat is absorbed from the room where heating is stopped to further perform the defrosting operation. It can be completed in a short time, and the comfort of heating operation is further improved.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not change the summary of invention. For example, in the above-described embodiment, only the terminal dedicated to heating is described as an example of the heat exchange terminal. However, the present invention is not limited to this, and another terminal (heat absorption / dissipation terminal) having a cooling / heating function may be applied. Moreover, although only the heating panel and the floor heating panel were demonstrated as an example as a heat exchange terminal, it is not restricted to this, You may apply the hot water room heater provided with the heating function, and another dedicated terminal (heat dissipation terminal).

1 Outdoor unit 7 Compressor 8 Outdoor heat exchanger (air heat exchanger)
9 Expansion valve 11 Water-refrigerant heat exchanger (water heat exchanger)
2 Cold / hot water outgoing pipe 2A Common outgoing pipe (introducing pipe)
2B1-2B3 Outward pipe (individual forward pipe, introduction pipe)
3A common return pipe (outflow line)
3B1-3B3 Return pipe (individual return pipe, outlet pipe)
51 Heating panel (heating terminal, heat exchange terminal)
52 Heating panel (heating terminal, heat exchange terminal)
53 Floor heating panel (floor heating terminal, heat exchange terminal)
91 Outbound header 92 Return header 100 Hot water heating system CU Outdoor unit controller (defrost control means)
RM Main remote control device (remote control device)
Remote control device for RA terminal (remote control device)
V1-V3 Thermal valve

Claims (2)

An outdoor unit having a compressor, an expansion valve, a heat pump device including an air heat exchanger, and a water heat exchanger that receives supply of refrigerant from the heat pump device and generates hot water by heat exchange with water;
Heating is performed by radiating heat to indoor air using the hot water generated by the water heat exchanger of the outdoor unit and supplied via an inlet pipe, and the hot water after the heat radiating is supplied to the outdoor via a lead-out pipe. A plurality of heat exchange terminals that are recirculated to the water heat exchanger of the machine by a circulation pump, and individual heat valves corresponding to the plurality of heat exchange terminals,
A remote control device that individually controls the operating states of the plurality of heat exchange terminals in a predetermined control mode, and an outdoor control unit that controls the compressor, the expansion valve, the thermal valve, and the like according to a command from the remote control device. Having a hot water heating system,
During the defrosting operation, the outdoor unit closes the heat valve corresponding to the currently operating heat exchange terminal among the plurality of heat exchange terminals, and the heat exchange currently stopped among the plurality of heat exchange terminals. -out open the Netsudoben corresponding to the terminal,
A hot water heating system comprising a defrosting control unit that opens all thermal valves corresponding to the plurality of heat exchange terminals when all of the plurality of heat exchange terminals are currently in operation . An outdoor unit having a compressor, an expansion valve, a heat pump device including an air heat exchanger, and a water heat exchanger that receives supply of refrigerant from the heat pump device and generates hot water by heat exchange with water;
Heating is performed by radiating heat to indoor air using the hot water generated by the water heat exchanger of the outdoor unit and supplied via an inlet pipe, and the hot water after the heat radiating is supplied to the outdoor via a lead-out pipe. A plurality of heat exchange terminals that are recirculated to the water heat exchanger of the machine by a circulation pump, and individual heat valves corresponding to the plurality of heat exchange terminals,
A remote control device that individually controls the operating states of the plurality of heat exchange terminals in a predetermined control mode; and an outdoor control unit that controls the compressor, the expansion valve, the thermal valve, and the like by a command from the remote control device;
In a hot water heating system having
During the defrosting operation, the outdoor unit closes the heat valve corresponding to the currently operating heat exchange terminal among the plurality of heat exchange terminals, and the heat exchange currently stopped among the plurality of heat exchange terminals. The defrost control means which opens the thermal valve corresponding to a terminal and raises the rotation speed of the said circulation pump is provided.
A hot water heating system characterized by that .

Images