JP5287370B2 - Heating system - Google Patents

Description

  The present invention relates to a heating apparatus having a plurality of heating terminals that are targets of temperature control.

  As an example of a heating device, a conventional floor heating device includes a plurality of floor heating panels (heating terminals) to be temperature controlled, a temperature control unit that circulates and supplies temperature control water (temperature control liquid) to the floor heating panel, A heat pump unit that heats the temperature-controlled water that circulates through the control unit, and circulates and supplies the temperature-controlled water heated by the heat pump unit to the floor heating panel. The temperature is adjusted (temperature control) so that

  In such a floor heating device, in order to avoid the redundancy of the configuration, a configuration in which the heat pump unit is shared by a plurality of floor heating panels is common, and the temperature of the temperature-controlled water supplied to the floor heating panel is all At the same temperature in the floor heating panel. If the set temperature of one floor heating panel is different from the set temperature of the other floor heating panels among the multiple floor heating panels, all the temperature-controlled water controlled to the temperature corresponding to the highest set temperature is in operation. Supplied to the floor heating panel. At this time, the temperature-controlled water supplied to the floor heating panel is suitable for the floor heating panel having the highest setting temperature (hereinafter also referred to as a high temperature setting area), but floor heating other than the floor heating panel having the highest setting temperature is used. Since the panel (hereinafter also referred to as a low temperature setting area) is too high, there is a problem that the floor temperature in the low temperature setting area is excessively increased. Therefore, an intermittent operation is disclosed in which an open / close valve that opens and closes the supply path of temperature-controlled water to the low temperature setting area is opened and closed at a predetermined cycle so as to reduce an increase in the floor temperature of the low temperature setting area and achieve an appropriate temperature. (For example, refer to Patent Document 1).

  As the on-off valve that opens and closes the temperature control water supply path, a thermally operated valve is used that heats and expands the valve body by energizing an electric heater, and opens or closes the valve body by expansion. (For example, refer to Patent Document 2).

JP 2006-329570 A JP 2001-336809 A

  By the way, the above-described heat pump unit has a refrigerant circuit through which refrigerant circulates, and the refrigerant circuit includes a compressor, a hydrothermal exchanger that heats temperature-controlled water, a decompression mechanism, and an evaporator that evaporates the refrigerant. It is customary to include it. In the example shown in FIG. 17, the heat pump unit prevents at least a part of a high-pressure portion (a compressor, a compressed refrigerant, a water heat exchanger, etc.) in the refrigerant circuit in order to prevent the inside of the refrigerant circuit from becoming too high. The temperature or the refrigerant pressure (high pressure) is detected, and when the detected value exceeds a predetermined value (high pressure suppression value Ds1), the operation with the control for suppressing the high pressure of the heat pump unit is performed, for example, the operation of the heat pump unit is suppressed. The overheating of the heat pump unit is avoided. Further, when the detected value exceeds the high-pressure suppression value Ds1 and continues to rise and exceeds a predetermined value (abnormal stop temperature Derr), the operation of the heat pump unit is abnormally stopped.

  However, it has been found that when the above intermittent operation is performed, depending on the interval between the abnormal stop temperature Derr and the high-pressure suppression value Ds1, there may be a situation that leads to an abnormal stop. The inventors of the present invention have investigated this cause, and the cause thereof is that the flow rate of the temperature-controlled water changes significantly as the on-off valve opens and closes, and the refrigerant in the water heat exchanger changes as the flow rate changes. It turned out that the amount of heat transfer to the temperature-controlled water changed, and the high pressure and its temperature fluctuated greatly.

  In order to maximize the capability of the heat pump unit, it is usual to operate near the limit temperature of the heat pump unit, and the abnormal stop temperature Derr is set according to this limit temperature. If the on-off valve is closed when operating near this limit temperature, the flow rate of the temperature-controlled water decreases, the amount of heat transfer from the refrigerant to the temperature-controlled water in the water heat exchanger decreases, and the high pressure rises rapidly. As shown in FIG. 17, due to a rapid increase in high pressure, the heat pump unit may be stopped abnormally without being able to keep the operation of the heat pump unit in time. In order to ensure reliability that does not lead to an abnormal stop, there must be a margin between the abnormal stop temperature Derr and the high pressure suppression value Ds1, and the reliability should be ensured while performing the above intermittent operation. There is a problem that is difficult.

  An example of a conventional method for energizing a thermal valve shown in FIG. 18 is to start energization at a predetermined operating voltage (for example, 200 V), gradually expand the valve body, and complete the opening of the thermal valve. It gradually increases from the closed state, and becomes fully open after a predetermined time T1 has elapsed since the start of energization. As described above, in the conventional thermal valve, the valve is opened and closed by energizing in a state where the applied voltage per unit time is kept constant.

  An object of the present invention is to provide a heating apparatus that ensures reliability while performing intermittent operation that appropriately sets the floor temperature in a low-temperature setting area based on such a new viewpoint and problem. .

In order to achieve this object, the present invention takes the following measures.
That is, the heating device according to the first invention includes a plurality of heating terminals, an on-off valve provided in each supply path to the plurality of heating terminals, and a circulation pump disposed upstream of the on-off valve. A temperature control unit that circulates and supplies the temperature adjustment liquid to these heating terminals, a heat pump unit that heats the temperature adjustment liquid that circulates through the temperature adjustment unit, and controls the operation of the temperature adjustment unit and the heat pump unit. And a control means for adjusting the temperature of the heating terminal based on a set temperature set for each of the heating terminals, and the control means has a set temperature of at least one of the plurality of heating terminals other than When the set temperature is different from that of the heating terminal, the open / close valve of the heating terminal other than the heating terminal having the highest set temperature is intermittently controlled, and the rotation speed of the circulation pump is set to open. The on-off valve than when it is so it is larger when in the closed state, controls the circulation pump.

  In this heating device, the flow rate of the temperature adjustment liquid increases when the on-off valve is open, and the flow rate of the temperature adjustment liquid decreases when the on-off valve is closed. Although the flow rate fluctuates significantly, the rotation of the circulation pump is controlled so that the closed valve is larger than when the on-off valve is open. The flow rate of the temperature adjustment liquid can be reduced by adjusting the circulation amount of the temperature adjustment liquid so that the fluctuation range of the circulation amount of the temperature adjustment liquid can be reduced. Nevertheless, stable operation of the heat pump unit can be provided.

  The heating device according to a second aspect of the invention is characterized in that the temperature control unit includes a flow rate sensor that detects a flow rate of the temperature adjustment liquid flowing in a heat exchanger in which the temperature adjustment liquid is heated by the heat pump unit, and the control means Controls the circulation pump so that the flow rate detected by the flow sensor becomes substantially constant.

  In this heating device, the flow rate of the temperature adjusting liquid flowing through the heat exchanger heated by the flow rate sensor and the circulation pump becomes substantially constant by the flow rate sensor and the circulation pump even though the flow rate is going to fluctuate due to opening and closing of the on-off valve. Therefore, the amount of heat transferred from the refrigerant to the temperature control liquid in this heat exchanger can be stabilized, and a stable operation of the heat pump unit can be provided.

  In the heating device according to a third aspect of the invention, the temperature control unit includes a temperature sensor disposed in a heat exchanger in which the temperature adjustment liquid is heated by the heat pump unit, and the control means is detected by the temperature sensor. The circulating pump is controlled so that the generated temperature becomes substantially constant.

  In this heating device, although the flow rate tends to fluctuate due to opening and closing of the on-off valve, the temperature of the heat exchanger is maintained almost constant, so the amount of heat transferred from the refrigerant to the temperature control liquid in this heat exchanger is reduced. It is possible to provide stable operation of the heat pump unit.

  According to a fourth aspect of the present invention, there is provided a heating device, wherein the heat pump unit includes a compressor that compresses refrigerant supplied to a heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated, and the control means includes the opening and closing unit. When the valve is changed from the open state to the closed state, the rotational speed of the compressor is smaller when the on-off valve is in the closed state than when the on-off valve is in the open state. Control the compressor.

  In this heating system, the flow rate tends to increase when the on-off valve is open due to opening and closing of the on-off valve, and the flow rate tends to decrease when the on-off valve is closed. In order to suppress the operation of the heat pump unit and reduce the increase in high pressure, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the heating device according to a fifth aspect of the invention, the heat pump unit is disposed in the vicinity of the evaporator that evaporates the refrigerant supplied to the heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated, and the evaporator. And the control means is configured such that when the on-off valve is changed from the open state to the closed state, the rotation speed of the fan is greater than when the on-off valve is in the open state. The fan is controlled so as to be smaller at a certain time.

  In this heating device, the flow rate tends to increase when the on / off valve is opened by opening and closing the open / close valve, and the flow rate tends to decrease when the on / off valve is closed. In order to suppress the operation of the heat pump unit and reduce the increase in high pressure, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the heating device according to a sixth aspect of the invention, the heat pump unit includes an evaporator for evaporating the refrigerant supplied to a heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated, and an upstream side of the evaporator. Provided with a valve mechanism arranged, and when the on-off valve is changed from an open state to a closed state, the control means is configured such that the opening degree of the valve mechanism is greater than that when the on-off valve is open. The valve mechanism is controlled so as to become larger when is in the closed state.

  In this heating device, the flow rate tends to increase when the open / close valve is opened by opening and closing the open / close valve, and the flow rate tends to decrease when the open / close valve is closed. In order to suppress the operation of the heat pump unit and reduce the increase in high pressure, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the heating device according to a seventh aspect of the invention, the on-off valve is a thermally operated valve that heats and expands the valve body by energizing an electric heater, and performs an opening operation or a closing operation by the expansion of the valve body. When the opening / closing valve is changed from the open state to the closed state, the means changes the applied voltage per unit time to the electric heater stepwise or intermittently energizes the electric heater. Change the valve to the closed state.

  In this heating device, when the applied voltage per unit time to the electric heater is changed stepwise or the energization to the electric heater is made intermittent, the time required from the open state to the closed state becomes longer than before, and the high voltage suddenly increases. Therefore, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  The heating device according to an eighth aspect of the present invention is configured such that the control means is capable of performing an operation in a normal mode and a long cycle mode in which the opening and closing of the on-off valve is intermittently controlled, and in the long cycle mode. The opening / closing cycle of the on-off valve in operation is set to be longer than the opening / closing cycle of the on-off valve in operation in the normal mode while making the opening / closing time ratio substantially the same.

  In this heating device, every time the on-off valve is opened / closed, the flow rate of the temperature control liquid is disturbed, and it takes a predetermined time for the disturbed flow rate to stabilize, so it may be difficult to control the operation in the normal mode. In the long cycle mode, the open / close cycle for opening and closing the open / close valve is set to be longer than the normal mode while keeping the opening / closing time ratio approximately the same, so the overall frequency of the turbulent flow of the temperature control liquid is reduced and the operation is controlled. May be easier.

  A heating apparatus according to a ninth aspect includes an operation unit for operating the temperature control unit and the heat pump unit, and the operation in the long cycle mode is started by a predetermined operation in the operation unit.

  In this heating apparatus, since the operation in the long cycle mode is started by a predetermined operation by the user at the operation unit, it is possible to respond to the user's request at an appropriate timing.

  Since the present invention has the configuration described above, the following effects can be obtained.

  In the first aspect of the invention, the flow of the temperature adjusting liquid increases when the on-off valve is open, and the flow of the temperature adjusting liquid decreases when the on-off valve is closed. The flow rate of the temperature adjustment liquid increases or decreases because the rotation of the circulation pump is controlled so that the on-off valve is larger than when the on-off valve is open. The flow rate of the temperature adjustment liquid is adjusted so that the flow rate of the temperature adjustment liquid can be reduced, and the fluctuation range of the circulation amount of the temperature adjustment liquid can be reduced. Nevertheless, stable operation of the heat pump unit can be provided.

  In the second aspect of the invention, the flow rate of the temperature adjustment liquid flowing through the heat exchanger heated by the flow rate sensor and the circulation pump is made substantially constant by the flow rate sensor and the circulation pump, even though the flow rate is about to fluctuate by opening and closing the on-off valve. Therefore, the amount of heat transfer from the refrigerant to the temperature control liquid in this heat exchanger can be stabilized, and a stable operation of the heat pump unit can be provided.

  In the third invention, the temperature of the heat exchanger is maintained almost constant even though the flow rate is going to fluctuate due to opening and closing of the on-off valve, so the amount of heat transferred from the refrigerant to the temperature control liquid in this heat exchanger It is possible to provide a stable operation of the heat pump unit.

  In the fourth invention, the flow rate tends to increase when the on-off valve is opened by opening and closing the on-off valve, and the flow rate tends to decrease when the on-off valve is closed. Since the control suppresses the operation of the heat pump unit and reduces the increase in high pressure, the open / close valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the fifth aspect of the invention, the flow rate tends to increase when the on / off valve is opened by opening and closing the open / close valve, and the flow rate tends to decrease when the on / off valve is closed. In order to suppress the operation of the heat pump unit and reduce the increase in high pressure, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the sixth aspect of the invention, the flow rate tends to increase when the on-off valve is opened due to opening / closing of the on-off valve, and the flow rate tends to decrease when the on-off valve is closed. Since the control suppresses the operation of the heat pump unit and reduces the increase in high pressure, the open / close valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the seventh invention, when the applied voltage per unit time to the electric heater is changed stepwise or the energization to the electric heater is made intermittent, the time required from the open state to the closed state becomes longer than before, and the high voltage is increased. Therefore, the on-off valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

  In the eighth aspect of the invention, the flow rate of the temperature adjusting liquid is disturbed every time the on-off valve is opened and closed, and a predetermined time is required until the disturbed flow rate is stabilized. Therefore, it may be difficult to control the operation in the normal mode. In the long cycle mode, since the open / close cycle for opening and closing the open / close valve is set longer than that in the normal mode, the frequency of disturbance of the flow rate of the temperature adjusting liquid may be reduced as a whole, and operation control may be facilitated.

  In the ninth aspect, since the operation in the long cycle mode is started by a predetermined operation by the user at the operation unit, it is possible to respond to the user's request at an appropriate timing.

The circuit diagram which shows the whole structure of the heating apparatus which concerns on one Embodiment of this invention, a water system, and a refrigerant | coolant system | strain. The figure which expanded a part of water system of the heating apparatus shown in FIG. The block diagram which shows the main structures of the control unit of the heating apparatus shown in FIG. The flowchart which shows the operation mode determination processing routine which the control unit shown in FIG. 3 performs. The flowchart which shows the high voltage | pressure control processing routine which the control unit shown in FIG. 3 performs. The flowchart which shows the temperature control process routine which the control unit shown in FIG. 3 performs. The flowchart which shows the circulation pump control processing routine which the control unit shown in FIG. 3 performs. The timing chart regarding the operation | movement of the thermal valve in the driving | operation in the 1st operation mode and the operation | movement in a 2nd operation mode which the heating apparatus shown in FIG. The timing chart regarding the operation | movement of the thermal valve in the intermittent operation in the 1st mode which the heating apparatus shown in FIG. 1 performs, a return water temperature, and a bed temperature. The timing chart regarding the operation | movement of the thermal valve in the intermittent operation in the 1st operation mode which the heating apparatus shown in FIG. 1 performs, the rotation speed of a circulation pump, and a condensation temperature. The flowchart which shows the high voltage | pressure suppression process routine at the time of the intermittent operation which the control unit which concerns on another embodiment of this invention performs. (A) of FIG. 12 is a timing chart regarding the operation of the thermal valve, the rotation speed of the compressor, and the condensation temperature in the operation in the first mode performed by the heating device shown in FIG. FIG. 12B is a diagram according to still another embodiment. FIG. 12C is a diagram according to still another embodiment. FIG. 13A is a timing chart regarding the energization of the thermal valve and the opening degree of the thermal valve according to still another embodiment. FIG. 13B is a diagram according to still another embodiment. The flowchart which shows the operation mode determination processing routine which the control unit which concerns on another embodiment performs. The flowchart which shows the intermittent operation control processing routine which the control unit shown in FIG. 14 performs. Explanatory drawing regarding the opening / closing period of the on-off valve of the normal mode and long period mode which the heating apparatus shown in FIG. 14 performs. Explanatory drawing regarding the operation | movement of the heat valve in the intermittent operation of the conventional heating apparatus, and the high voltage | pressure control of a heat pump unit. Explanatory drawing regarding energization of the thermal valve of the conventional heating apparatus, and its opening degree.

(First embodiment)
Hereinafter, a heating device provided with a plurality of heating terminals concerning the present invention is explained, referring to drawings. The heating device includes various modifications of the heating terminal, for example, a floor heating device, a panel radiator, a hot water heater, a bathroom heater, and the like. An example will be described.

  As shown in FIG. 1, a floor heating apparatus 100 according to the present embodiment uses a multi-type heat pump system, and an indoor unit 18 and a temperature control unit 1 are arranged in parallel with respect to one outdoor unit 17. It is connected to the. And the air conditioner is comprised by making the outdoor unit 17 and the indoor unit 18 into a main body, Moreover, the heat pump unit 5 containing the outdoor unit 17, the temperature control unit 1, and several floor heating panels 2a-2d The floor heating apparatus 100 is mainly configured.

[Floor heating device 100]
The floor heating apparatus 100 includes a plurality (four in this embodiment) of floor heating panels 2a to 2d arranged on the floor of a house, and temperature control water 8 (temperature control liquid) to these floor heating panels 2a to 2d. It has a temperature control unit 1 that circulates and a heat pump unit 5 that heats temperature control water 8 that circulates through the temperature control unit 1.

  The temperature control unit 1 and the floor heating panels 2a to 2d are connected to each other by a temperature control water pipe 3 including temperature control water outlet pipes 53a to 53d and temperature control water return pipes 55a to 55d. Then, the temperature adjustment water 8 is circulated and supplied between the temperature adjustment unit 1 and the floor heating panels 2a to 2d through the temperature adjustment water pipe 3.

[Temperature control unit 1]
First, the water system of the floor heating apparatus 100 of the circuit diagram in FIG. 1 will be described.
The temperature control unit 1 includes a machine room 1a and a header room 1b. The machine room 1a is provided with a water heat exchanger 16, a simple sealed expansion tank 7, a circulation pump 9, and a microcomputer 33. ing. On the other hand, a forward header 4 and a return header 6 are provided in the header chamber 1b. More specifically, a forward pipe 10 is connected to the bottom of the expansion tank 7 in the machine chamber 1a, and the tip thereof is connected to the forward header 4 of the header chamber 1b via a circulation pump 9. The forward header 4 includes a substantially cylindrical header body 4a, a main pipe connection portion 4b formed at the base end portion thereof, and a plurality of the header headers 4a formed in parallel in the longitudinal direction of the outer periphery of the header body 4a (this embodiment). 4) in the form) branch pipe connection portions 51a to 51d, the forward pipe 10 is connected to the main pipe connection portion 4b, and leads to the floor heating panels 2a to 2d to the branch pipe connection portions 51a to 51d. One ends of the temperature-controlled water outlet pipes 53a to 53d are connected. These temperature control water supply pipes 53a to 53d are provided with thermally operated valves 52a to 52d, which are on-off valves corresponding to the branch pipe connection portions 51a to 51d. On the other hand, the other ends of the temperature adjustment water supply pipes 53a to 53d are connected to one ends of meandering temperature adjustment water circulation pipes 54a to 54d formed in the floor heating panels 2a to 2d. Accordingly, the temperature control water 8 in the expansion tank 7 is supplied to the forward pipe 10 by the operation of the circulation pump 9, and further divided into a plurality of temperature control water forward pipes 53a to 53d by the forward header 4, and each floor heating. Supplied to panels 2a-2d.

  On the other hand, temperature control water return pipes 55a to 55d are connected to the other ends of the temperature control water circulation pipes 54a to 54d formed in the floor heating panels 2a to 2d. Are connected to the return header 6. Similar to the forward header 4, the return header 6 is formed by arranging a substantially cylindrical header body 6 a, a main pipe connection portion 6 b formed at the base end portion thereof, and a longitudinal direction of the outer peripheral portion of the header body 6 a. A plurality of (four in this embodiment) branch pipe connection portions 56a to 56d, and the temperature control water return pipes 55a to 55d are connected to the branch pipe connection portions 56a to 56d, and the main pipe connection. A return pipe 12 is connected to the portion 6b.

  The return pipe 12 and the expansion tank 7 are connected by a heat exchange path 13 of a water heat exchanger 16. The water heat exchanger 16 also functions as a condenser or evaporator of the refrigerant circuit described below, and is provided so that heat can be exchanged between the temperature-controlled water 8 flowing through the heat exchange path 13 returned from the return pipe 12 and the refrigerant. The water heat exchanger 16 heats or cools the temperature control water 8 returned from the return pipe 12. As a result, the temperature-controlled water 8 circulated through the temperature-controlled water circulation pipes 54a to 54d of the floor heating panels 2a to 2d flows into the return header 6 through the temperature-controlled water return pipes 55a to 55d. The temperature-controlled water 8 flowing through the temperature-controlled water return pipes 55a to 55d is joined and supplied to the return pipe 12, and further heated by the heat exchange path 13 of the water heat exchanger 16, and then supplied to the expansion tank 7. The The return pipe 12 has a return water temperature detection thermistor 35 which is a temperature detection means for detecting the temperature of the return water, and the water heat exchanger 16 detects the temperature of the water heat exchanger 16, that is, the condensation temperature. A hydrothermal temperature detection thermistor 36 is attached. A flow sensor 50 that detects the flow rate of the temperature-controlled water 8 that flows through the forward pipe 10 is attached to the forward pipe 10 that connects the expansion tank 7 and the circulation pump 9.

  Here, the floor heating panels 2a to 2d are set to target temperatures in the wired remote controllers 46 and 47, which are operation units, and are adjusted to have the set target temperatures (set temperatures). Here, in the remote controllers 46 and 47, each of the floor heating panels 2a to 2d can be set by selecting any one of the nine preset temperatures. For example, all the floor heating panels 2a to 2d can be set. Set to the same set temperature, set so that the set temperatures of all floor heating panels 2a to 2d are different, or set the set temperature of the floor heating panel 2a and the set temperature of the floor heating panels 2b to 2d to be different It is possible to set. In this embodiment, as shown in FIG. 2, among floor heating panels 2a-2d, the setting temperature of floor heating panel 2a is the highest, the setting temperature of floor heating panels 2b-2d is the same, and floor heating panel 2a The set temperature is lower than the set temperature. (Hereinafter, the floor heating panel 2a may be referred to as “high temperature setting area” and the floor heating panels 2b to 2d may be referred to as “low temperature setting area”.) Note that there are a plurality of floor heating panels 2a to 2d in one room. It can be installed or installed in multiple rooms.

[Heat pump unit 5]
Next, the refrigerant | coolant system | strain of the floor heating apparatus 100 of the circuit diagram in FIG. 1 is demonstrated.
In the following description, the heating operation is described as an example.
In the present embodiment, the heat pump unit 5 uses the water heat exchanger 16 included in the temperature control unit 1 to heat the temperature control water 8, and the water heat exchanger 16 and the evaporator of the outdoor unit 17. A refrigerant circulation circuit is configured with the outdoor heat exchanger 19, and the temperature control water 8 flowing through the heat exchange path 13 is heated. Moreover, as shown in FIG. 1, the indoor unit 18 connected to the outdoor unit 17 of this heat pump system is provided, and the outdoor unit 17 and the indoor unit 18 comprise the air conditioner. In this air conditioner, in the order in which the refrigerant can circulate, the outdoor heat exchanger 20, the indoor heat exchanger 20 provided with the indoor fan 20 a, the decompression mechanism 22 (electric expansion valve 22), and the evaporator fan 19 a are provided in the vicinity. A heat exchanger 19 is connected to form a refrigerant circulation circuit. In other words, the refrigerant circulation circuit in the heat pump unit 5 has the water heat exchanger 16, the compressor 21, the outdoor heat exchanger 19, and the pressure reducing mechanism 22 (electric expansion) in the reverse order (upstream) in the order in which the refrigerant circulates. It includes a valve 22).

  More specifically, the discharge pipe 21a and the suction pipe 21b of the compressor 21 are connected to the primary port of the four-way switching valve 23, and the accumulator 31 is interposed in the suction pipe 21b, while the discharge pipe A discharge pipe temperature detection thermistor 38 is attached to 21a. Between the pair of secondary ports of the four-way switching valve 23, the first gas pipe 24a, the indoor heat exchanger 20, the first liquid pipe 24b, the pressure reducing mechanism 22, the second liquid pipe 24c, and the outdoor heat exchange are provided. The vessel 19 and the second gas pipe 24d are connected in an annular shape in order. At this time, the indoor heat exchanger 20 and the outdoor heat exchanger 19 are respectively provided with an indoor heat exchanger temperature detection thermistor 43 and an outdoor heat exchanger temperature detection thermistor 41, and further, the indoor unit 18 and the outdoor unit 17. Are attached with an indoor temperature detection thermistor 44 and an outdoor temperature detection thermistor 42, respectively.

  The first liquid pipe 24b is provided with a substantially cylindrical header 26 similar to the headers 4 and 6 provided in the temperature control unit 1, and the header 26 and the indoor heat exchanger are provided. A portion between 20 is a liquid pipe 25 a of the communication pipe 25. Similarly, a substantially cylindrical header 27 is also interposed in the first gas pipe 24 a, and a portion between the header 27 and the indoor heat exchanger 20 is a gas pipe 25 b of the communication pipe 25. The liquid pipe 28a, which is another communication pipe 28 connected to the header 26, is connected to one end of the water heat exchanger 16 of the temperature control unit 1 and is connected to the header 27. A gas pipe 28 b that is a pipe 28 is connected to the other end of the water heat exchanger 16.

  As a result, the outdoor heat exchanger 19, the decompression mechanism 22, and the water heat exchanger 16 of the temperature control unit 1 are connected to the four-way switching valve 23 in an annular shape. The liquid pipes 25a and 28a of the connecting pipes 25 and 28 are connected to the header 26 via electric expansion valves 29 and 30, respectively. By controlling the opening and closing of the electric expansion valves 29 and 30 as appropriate, The refrigerant amount supplied to both the unit 18 and the temperature control unit 1 can be controlled. Here, liquid pipe temperature detection thermistors 39 and 37 are respectively attached to the liquid pipe 25a on the indoor unit 18 side and the temperature control unit 1 side of the liquid pipe 28a, and the outdoor units of the gas pipes 25b and 28b are provided. On the 17 side, gas pipe temperature detection thermistors 40a and 40b are respectively attached.

  The microcomputer 32 provided in the outdoor unit 17 is supplied with power of, for example, 200 V and 20 A from the power source, and electrical control in the outdoor unit 17 is performed. The floor temperature controller includes a wireless remote controller 45 for starting and stopping indoor air conditioning operation, and a wired remote controller for performing similar operations for floor air conditioning as described above. 46 and 47 are provided. These remote controllers 45 to 47 make settings such as room temperature and floor temperature desired by the user. Further, the microcomputer 32 of the outdoor unit 17 and the microcomputer 34 provided in the indoor unit 18, and the microcomputer 32 of the outdoor unit 17 and the microcomputer 33 provided in the temperature control unit 1 are respectively connected by signal / power lines. It is connected. For this reason, when the user performs setting for linking the air conditioner and the temperature control unit 1, for example, an operation start operation in the wireless remote controller 45 starts operation using both the air conditioner and the temperature control unit 1. It is also possible.

[Control unit 60]
Next, the main structure of the control unit 60 of the floor heating apparatus 100 of the present embodiment will be described with reference to FIG.

  The control unit 60 that is a control means is at least one of the microcomputers 32 to 33, and includes a temperature control unit control unit 61, a heat pump unit control unit 62, an operation mode determination unit 63, and a high-pressure suppression value storage unit 64. have. The control unit 60 includes remote controllers 46 and 47, which are operation units, a flow sensor 50, a return water temperature detection thermistor 35, a circulation pump 9, thermal valves 52a to 52d, an evaporator fan 19a, and a compressor 21. The electric expansion valve 22 and the hydrothermal temperature detection thermistor 36 are connected to each other.

  The operation mode determination unit 63 is connected to remote controllers 46 and 47 which are operation units. Based on the operation with the remote controllers 46 and 47, the operation of the temperature control unit 1 and the heat pump unit 5 is changed to the first operation mode and Determine which of the second operating modes should be performed. Specifically, the operation mode determination unit 63 performs the operation of the temperature control unit 1 and the heat pump unit 5 when the remote control 46 or 47 receives a high temperature request operation that is an operation requesting a high temperature operation. It is decided to carry out in 2 operation modes. The operation mode determination unit 63 performs the operation of the temperature control unit 1 and the heat pump unit 5 in the first operation mode when a predetermined time has elapsed after determining that the operation in the second operation mode is performed. decide.

  The high-pressure suppression value storage unit 64 stores a first high-pressure suppression value Ds1 and a second high-pressure suppression value Ds2 used for control for suppressing the high pressure of the heat pump unit 5, and is provided in the microcomputers 32-33. This corresponds to a storage device such as a ROM (not shown). The control for suppressing the high pressure of the heat pump unit 5 is performed by detecting the temperature or the refrigerant pressure (high pressure) of at least a part of the high pressure part (compressor, compressed refrigerant, water heat exchanger, etc.) in the refrigerant circuit. This is control that suppresses the operation of the heat pump unit 5 when the measured value exceeds a predetermined value (high pressure suppression value). In this embodiment, this control is performed by detecting the condensation temperature of the refrigerant in the water heat exchanger. The first high pressure suppression value Ds1 and the second high pressure suppression value Ds2 are compared with the detected condensing temperature and used as a reference for determining whether or not to suppress the operation of the heat pump unit 5. In the operation in the first operation mode, the first high pressure suppression value Ds1 is used, and in the operation in the second operation mode, the second high pressure suppression value Ds2 is used. The first high pressure suppression value Ds1 and the second high pressure suppression value Ds2 are both lower than an abnormal stop temperature Derr described later, but the second high pressure suppression value Ds2 is set to a value higher than the first high pressure suppression value Ds1. Yes.

  The temperature control unit control unit 61 controls the operation of the temperature control unit 1, and includes a pump control unit 65 that controls driving (rotation) of the circulation pump 9 and heat that controls opening and closing of the thermal valves 52a to 52d. And a valve control unit 66 to drive the circulation pump 9 and the heat valve. The temperature control unit controller 61 performs operation based on a predetermined operation start operation and operation stop operation input by the user to the remote controllers 46 and 47, and the user inputs a predetermined temperature setting operation to the remote controllers 46 and 47. The target return water temperature DH that is the target temperature of the temperature-controlled water returning from the floor heating panels 2a to 2d is determined based on the set temperature of the floor heating panels 2a to 2d set by.

  Further, the temperature control unit controller 61 determines that the detected return water temperature and the determined target return water temperature DH are approximately based on the return water temperature detected by the water temperature detection thermistor 35 and the determined target return water temperature DH. In order to match, the heat pump unit control unit 62 described later is requested to suppress the operation of the heat pump unit 5 and release the operation suppression.

  Moreover, the temperature control unit controller 61 determines whether or not to perform intermittent operation based on the set temperatures of the plurality of floor heating panels 2, and when performing intermittent operation, the intermittent cycle of opening and closing of each thermal valve 52 is determined as follows: It determines based on the difference of the preset temperature of the floor heating panel 2 corresponding to the thermal valve 52, and the highest preset temperature, and opens and closes each thermal valve 52 with the determined period.

  Further, the temperature control unit controller 61 controls the operation of the temperature control unit 1 based on the determination of the operation mode determination unit 63. Specifically, when the operation mode determination unit 63 determines that the operation in the second operation mode should be performed, all the thermal valves 52 of the floor heating panel 2 to be operated are fixed in the open state. Further, when the operation mode determination unit 63 determines that the operation in the first operation mode should be performed, and when performing the intermittent operation, the circulation pump 9 is switched according to the opening / closing of the thermal valve 52 in the intermittent operation. And the opening / closing timing and scheduled opening / closing time of the thermal valve 52 are transmitted to the heat pump unit controller 62.

  The heat pump unit controller 62 controls the operation of the heat pump unit 5, and controls the driving (rotation) of the evaporator fan 19a provided in the vicinity of the evaporator (outdoor heat exchanger 19) that evaporates the refrigerant. A fan control unit 67, a compressor control unit 68 that controls driving (rotation) of the compressor 21 that compresses the refrigerant, and an expansion valve control unit that drives the electric expansion valve 22 of the decompression mechanism 22 to control its opening degree. 69, each actuator is driven on the basis of the control of the operation from the temperature control unit 1 and the cancellation of the operation suppression, and other requests related to the operation, and the water heat exchanger 16 supplies the temperature control water 8 Heat.

  Further, the heat pump unit control unit 62 includes the refrigerant condensation temperature in the hydrothermal exchanger 16 detected by the hydrothermal exchange temperature detection thermistor 36, the first high pressure suppression value Ds1 and the second high pressure suppression value in the high pressure suppression value storage unit 64. Based on Ds2, the operation of the heat pump unit 5 is suppressed and the operation suppression is released. The heat pump unit control unit 62 uses the first high pressure suppression value Ds1 when the operation mode determination unit 63 determines that the operation in the first operation mode should be performed, and the operation mode determination unit 63 operates in the second operation mode. Is used, the second high-pressure suppression value Ds2 is used.

  The heat pump unit control unit 62 is a case where the operation mode determination unit 63 determines that the operation in the first operation mode should be performed, and the temperature control unit control unit 61 performs the intermittent operation. The actuators such as the evaporator fan 19a, the compressor 21, and the electric expansion valve 22 are controlled based on the opening / closing timing and the scheduled opening / closing time of the thermal valve 52 transmitted from the control unit 61.

[Operation of floor heating apparatus 100]
Next, the operation of the floor heating apparatus 100 will be described. The microcomputers 32 to 33 always execute the operation mode determination processing routine shown in FIG.

  That is, when the operation mode determination processing routine is executed, first, the microcomputers 32 to 33 determine whether or not an operation for starting the operation is input by the remote controllers 46 and 47 (S1), and an operation for starting the operation. Is waited until it is determined that is input (S1: NO). On the other hand, when it is determined that an operation for starting the operation is input (S1: YES), the microcomputers 32 to 33 determine that the temperature control unit 1 and the heat pump unit 5 are operated in the first operation mode ( S2).

  Next, the microcomputers 32 to 33 determine whether or not a high temperature request operation for requesting a high temperature has been performed in accordance with the operation to start driving (S3). When it is determined that the high temperature request operation has been performed (S3: YES), the microcomputers 32 to 33 determine that the temperature control unit 1 and the heat pump unit 5 are operated in the second operation mode (S4). Next, the microcomputers 32 to 33 determine whether or not a predetermined time has elapsed after determining to perform the second operation mode (S5), and wait until the predetermined time elapses (S5: NO). If it is determined that the predetermined time has elapsed (S5: YES), the microcomputers 32 to 33 determine to perform the first operation mode (S6), and return to the execution of the process of S1.

  On the other hand, in the process of S3, when it is determined that the high temperature request operation is not performed (S3: NO), the microcomputers 32 to 33 determine to perform the first operation mode (S6), and the process of S1 is performed. Return to execution.

  Thus, the operation modes determination part 63 is implement | achieved when the microcomputers 32-33 execute an operation mode determination process routine.

  Further, the microcomputers 32 to 33 execute a heat pump unit control processing routine (not shown) and simultaneously execute the high pressure suppression processing routine shown in FIG. A unit control unit 62 is realized.

  That is, when the high-pressure suppression processing routine is executed, first, the microcomputers 32 to 33 determine whether or not the operation of the heat pump unit 5 is determined to be performed in the second operation mode (A1). When it is determined that the operation is determined to be performed in the second operation mode (A1: YES), the microcomputers 32 to 33 use the second high-pressure suppression value Ds2 stored in the high-pressure suppression value storage unit 64. It is set (stored) in the use suppression value that is the suppression value to be performed (A2). On the other hand, when it is determined that the operation is not determined to be performed in the second operation mode (A1: NO), the microcomputers 32 to 33 have the first high pressure suppression value stored in the high pressure suppression value storage unit 64. Ds1 is set (stored) in a use suppression value that is a suppression value to be used (A3).

  Next, the microcomputers 32-33 detect the refrigerant | coolant condensing temperature in the high voltage | pressure part (for example, hydrothermal exchanger 16) by the hydrothermal exchange temperature detection thermistor 36 (A4). Next, the microcomputers 32 to 33 compare the detected temperature of the high-pressure part (condensation temperature) with the set use suppression value, and determine whether the temperature of the high-pressure part is equal to or higher than the use suppression value (A5). ). When it determines with the temperature of a high voltage | pressure part being more than a use suppression value (A5: YES), the microcomputers 32-33 suppress the driving | operation of the heat pump unit 5 (A6). On the other hand, when it determines with the temperature of a high voltage | pressure part not being more than a use suppression value (A5: NO), the microcomputers 32-33 cancel | release suppression of the driving | operation of the heat pump unit 5, and accelerate | stimulate the driving | operation of the heat pump unit 5. (A7).

  Next, the microcomputers 32 to 33 determine whether or not the temperature of the high pressure section is equal to or higher than the abnormal stop value stored in advance (A8). If it is determined that the temperature of the high pressure part is equal to or higher than the abnormal stop value (A8: YES), the microcomputers 32 to 33 stop the operation of the heat pump unit 5 (A9) and return to the execution of the process of A1. . On the other hand, when it is determined that the temperature of the high pressure portion is not equal to or higher than the abnormal stop value (A8: NO), the process returns to the execution of A1.

  Further, the microcomputers 32 to 33 realize a part of the temperature control unit controller 61 by executing the temperature control process routine shown in FIG.

  That is, when the temperature control process routine is executed, first, the microcomputers 32 to 33 identify the set temperatures of all the floor heating panels 2 that are in operation (operation target) (B1). Next, the microcomputers 32 to 33 set the highest set temperature among the specified set temperatures to the target return water temperature DH that is the target temperature of the temperature-controlled water returning from the floor heating panels 2a to 2d (B2). .

  Next, the microcomputers 32 to 33 determine whether or not the operation of the temperature control unit 1 is determined to be performed in the second operation mode (B3). When it is determined that the operation is determined to be performed in the second operation mode (B3: YES), the microcomputers 32 to 33 set the thermal valves 52 to all the floor heating panels 2 during operation (operation target). It fixes to an open state (B4) and returns to execution of the process of B1.

  On the other hand, in the process of B3, when it is determined that the operation of the temperature control unit 1 is not determined to be performed in the second operation mode, that is, it is determined that the operation of the temperature control unit 1 is determined to be performed in the first operation mode. (B3: NO), the microcomputers 32 to 33 execute a return water temperature control processing routine (not shown) (B5). Specifically, based on the return water temperature detected by the water temperature detection thermistor 35 and the determined target return water temperature DH, the detected return water temperature and the determined target return water temperature DH are substantially matched. It requests the heat pump unit controller 62 described later to suppress the operation of the heat pump unit 5 and release the operation suppression.

  Next, the microcomputers 32 to 33 determine whether or not the set temperatures of all the floor heating panels 2 during operation (operation target) are the same (B6), and the set temperatures of all the floor heating panels 2 are determined. If it is determined that they are the same (B6: YES), the microcomputers 32 to 33 return to the execution of the process B1. On the other hand, when it is determined that the set temperatures of all the floor heating panels 2 are not the same (B6: NO), the microcomputers 32 to 33 execute an intermittent operation control processing routine (not shown) for performing the above intermittent operation. (B7), the process returns to the execution of the process B1.

  Further, the microcomputers 32 to 33 realize the pump control unit 65 by executing the circulation pump control processing routine shown in FIG. 7 in parallel with the execution of the temperature control processing routine described above, thereby controlling the temperature control unit. Part of the unit 61 is realized.

  That is, when the circulation pump control processing routine is executed, first, the microcomputers 32 to 33 determine whether or not the operation of the temperature control unit 1 is determined to be performed in the second operation mode (C1). If it is determined that the operation is determined to be performed in the second operation mode (C1: YES), the microcomputers 32 to 33 drive (rotate) the circulation pump 9 at a predetermined rotational speed R1. (Return to the execution of the processes C2 and C1.

  On the other hand, in the process of C1, when it is determined that the operation of the temperature control unit 1 is not determined to be performed in the second operation mode, that is, it is determined to be performed in the first operation mode (C1: NO), the micro The computers 32 to 33 determine whether an intermittent operation in which the opening and closing of the thermal valve 52 is intermittent is being performed (C3). Specifically, it is determined by whether or not the intermittent operation control process is being executed in the temperature control process routine shown in FIG. If it is determined that the intermittent operation is not being performed (C3: NO), the microcomputers 32 to 33 return to the execution of the process of C1.

  On the other hand, if it is determined that the operation is intermittent (C3: YES), the microcomputers 32 to 33 detect the flow rate of the temperature-controlled water 8 flowing through the water heat exchanger 16 with the flow sensor 50 (C4). Next, the microcomputers 32 to 33 increase the number of rotations of the circulation pump 9 when the detected flow rate becomes smaller than the average value of the flow rate in the immediately preceding predetermined period, and the rotation of the circulation pump 9 when the reverse is true. The number of rotations of the circulating pump 9 is set in a direction in which the number is decreased and the detected flow rate fluctuation is reduced (C5).

  Next, the microcomputers 32 to 33 determine whether or not the thermal valve 52 is switched from the open state to the closed state (C6). This switching is a period of time after the thermal valve 52 starts switching from the open state to the closed state. If it is determined that the thermal valve 52 is at the time of switching from the open state to the closed state (C6: YES), the microcomputers 32 to 33 store the rotational speed of the circulation pump 9 in a predetermined rotation stored in advance. The number is changed to R2 and maintained (C7), and the process returns to the execution of the process C1.

  On the other hand, in the process of C6, when it is determined that the thermal valve 52 is not at the time of switching from the open state to the closed state (C6: NO), the microcomputers 32 to 33 open the thermal valve 52 from the closed state. It is determined whether it is time to switch to the state 8C8). This switching refers to a period of time after the thermal valve 52 starts switching from the closed state to the open state. When it is determined that the thermal valve 52 is not at the time of switching from the closed state to the open state (C8: NO), the microcomputers 32 to 33 return to the execution of the process of C1. On the other hand, when it is determined that the thermal valve 52 is in the time of switching from the closed state to the open state (C8: YES), the microcomputers 32 to 33 store the rotational speed of the circulation pump 9 in a predetermined storage. The rotational speed R3 is changed and maintained (C9), and the process returns to the execution of the process C1.

  Thus, since the predetermined rotational speed R2 is set larger than the predetermined rotational speed R3, the rotational speed of the circulation pump 9 is higher when the thermal valve 52 is closed than when the thermal valve 52 is open. It is controlled to be larger at a certain time. Further, in order to cope with the fact that the flow rate of the temperature control water 8 tends to fluctuate greatly due to the opening / closing of the thermal valve 52, the rotational speed of the circulation pump 9 is maintained for a predetermined period near the time when the opening / closing state of the thermal valve 52 is switched. Is changed to the rotational speed (R1 or R2) stored in advance, and thereafter, in order to finely adjust the flow rate, the rotational speed of the circulation pump 9 is adjusted so that the flow rate becomes constant using the flow rate sensor 50. Fine adjustment.

  In the present embodiment, both the control for changing the rotation speed of the circulation pump 9 to a predetermined rotation number and the control for changing the rotation speed of the circulation pump 9 according to the detection result of the flow sensor 50 are performed. Needless to say, either one may be used.

  As mentioned above, although the structure and operation | movement of the temperature control unit 1, the heat pump unit 5, and the control unit 60 etc. which control these were demonstrated separately, hereafter, these whole operation | movement is demonstrated. The premise of the description is that all floor heating panels 2a to 2d are to be operated, the set temperature of the floor heating panel 2a is set to DH, the set temperature of the floor heating panels 2b to 2d is set to DL, and the set temperature DH Is set higher than the set temperature DL, the floor heating panel 2a is a high temperature setting area, and the floor heating panels 2b to 2d are low temperature setting areas.

  First, the operation of the thermal valve and the condensation temperature in the operation in the first operation mode and the operation in the second operation mode will be described with reference to FIG.

  When an operation for starting the operation is performed with the operation unit (remote controllers 46 and 47), the operation mode determination unit 63 determines to perform the operation in the first operation mode, and the operation in the first operation mode is started. In the temperature control unit 1, all of the thermal valves 52a to 52d are opened, and the circulation pump 9 rotates. At the same time, in the heat pump unit 5, the compressor 21 and the like are driven, the temperature adjustment water 8 is heated by the water heat exchanger 16, and the condensation temperature detected by the hydrothermal exchange temperature detection thermistor 36 increases.

  When the detected condensation temperature rises above the first high pressure suppression value Ds1, the heat pump unit control unit 62 suppresses the operation of the heat pump unit 5, and the condensation temperature decreases. Thereafter, when the detected condensation temperature falls below the first high pressure suppression value Ds1, the suppression of the operation of the heat pump unit 5 is released again, the operation is promoted, the condensation temperature rises, and the detected condensation temperature becomes the first high pressure. If it exceeds the suppression value Ds1, the operation of the heat pump unit 5 is suppressed. In this way, the detected condensing temperature is controlled to substantially coincide with the first high pressure suppression value Ds1.

  In the operation in the first operation mode, intermittent operation for periodically opening and closing the thermal valves 52b to 52d in the low temperature area is performed. The intermittent operation will be described later.

  When a high temperature request operation for requesting a high temperature is performed by the operation unit (remote controllers 46 and 47), the operation mode determination unit 63 determines to perform the operation in the second operation mode, and the operation in the second operation mode starts. To do. In the temperature control unit 1, the intermittent operation is stopped to fix all the thermal valves 52b to 52d to the open state, and the circulation pump 9 rotates at a constant rotational speed R3. Since control based on the second high pressure suppression value Ds2 is performed in the second operation mode, the operation of the heat pump unit 5 is performed at the start of the second operation mode in which the detected condensation temperature is lower than the second high pressure suppression value Ds2. Is promoted to increase the condensation temperature.

  Thereafter, when the detected condensation temperature rises above the second high pressure suppression value Ds2, the operation of the heat pump unit 5 is suppressed, and the condensation temperature decreases. Thereafter, when the detected condensation temperature falls below the second high pressure suppression value Ds2, the suppression of the operation of the heat pump unit 5 is released again, the operation is promoted, and the condensation temperature rises. In this way, the detected condensation temperature is controlled so as to substantially coincide with the second high pressure suppression value Ds2.

  Therefore, in the second operation mode, the thermal valve 52 is fixed in the open state, and compared with the first operation mode, the fluctuation range of the flow and the fluctuation range of the high pressure are reduced, and control for suppressing the high pressure is performed. The high pressure suppression value used can be increased, the high pressure suppression value is set from the first high pressure suppression value Ds1 to the second high pressure suppression value Ds2, the condensation temperature is increased, and the temperature of the temperature control water 8 is increased. doing.

  In addition, after a predetermined time has elapsed from the time when it is determined to operate in the second operation mode, that is, when the operation in the second operation mode is started, the high pressure suppression value used for the control for suppressing high pressure is set. The first high pressure suppression value Ds1 is smaller than the second high pressure suppression value Ds2, the operation in the second operation mode is terminated, and the operation is switched to the operation in the first operation mode.

  Next, the operation of the thermal valve, the return water temperature, and the bed temperature in the intermittent operation in the first mode will be described with reference to FIG.

  When an operation to start driving is performed with the operation unit (remote controllers 46 and 47), driving in the first driving mode starts from time T0. In the temperature control unit 1, all of the thermal valves 52a to 52d are opened, and the circulation pump 9 rotates. At the same time, in the heat pump unit 5, the compressor 21 and the like are driven, the temperature adjustment water 8 is heated by the water heat exchanger 16, and the return water temperature detected by the return water temperature detection thermistor 35 rises. When the detected return water temperature exceeds the target return water temperature DH, the operation of the heat pump unit 5 is suppressed, and when the detected return water temperature falls below the target return water temperature DH, the suppression of the operation of the heat pump unit 5 is released. Then, by promoting the operation, the detected return water temperature is controlled to substantially match the target return water temperature DH.

  Moreover, the intermittent operation | movement which periodically opens and closes the heat operated valves 52b-52d is started from the time Ts when the predetermined time has elapsed since the start of the operation in the first operation mode. The open / close cycle of the thermal valves 52b to 52d is based on the temperature difference between the target return water temperature DH and the set temperature DL of the floor temperature in the low temperature area, and the thermal valve 52 is opened in the period Ton. Determined to be closed. The floor temperature in the low temperature setting area substantially matches the return water temperature detected until the intermittent operation is started, but when the intermittent operation is started, the temperature is lowered when the thermal valve 52 is closed, The temperature rises when the thermal valve 52 is opened, gradually approaches the set temperature DL in the low temperature setting area, and substantially coincides at the time Td, and after that, almost reaches the set temperature DL in the low temperature setting area. Maintained to match.

  However, although the bed temperature in the low temperature setting area can be adjusted to an appropriate temperature by intermittent operation in the first operation mode, the condensing temperature and thus the high pressure fluctuate greatly as the thermal valve 52 is opened and closed. Specifically, when the thermal valve 52 is switched from the open state to the closed state, the flow rate of the temperature control water 8 flowing through the water heat exchanger 16 is greatly reduced, and due to the decrease in the flow rate, the temperature from the refrigerant in the water heat exchanger 16 is increased. Although the amount of heat transfer to the water conditioning 8 decreases and the amount of heat transfer decreases, the temporarily compressed refrigerant is supplied, so the condensation temperature and high pressure rise. On the other hand, when the thermal valve 52 is switched from the closed state to the open state, the flow rate of the temperature adjustment water 8 flowing through the water heat exchanger 16 is greatly increased, and the temperature adjustment water 8 from the refrigerant in the water heat exchanger 16 is increased by the increase in the flow rate. Although the amount of heat transfer to the water increases and the amount of heat transfer increases, the supply of compressed refrigerant is insufficient, so the condensation temperature and high pressure decrease. Therefore, the time when the thermal valve 52 is switched from the open state to the closed state is particularly when the heat pump unit 5 is likely to be abnormally stopped.

  Therefore, as shown in FIG. 10, when the thermal valves 52b to 52d in the low temperature area are opened, the rotational speed of the circulation pump 9 is set to a predetermined rotational speed R3, and the thermal valves 52b to 52d are closed. In this case, the rotational speed of the circulation pump 9 is set to a rotational speed R2 larger than the rotational speed R3, and the fluctuation range of the flow rate of the temperature control water 8 flowing through the hydrothermal exchanger 16 is reduced or minimized, so that the condensation temperature is reduced. It is stabilized so as to be constant, ensuring reliability.

  As described above, the heating device (floor heating device 100) according to the present embodiment includes a plurality of heating terminals (floor heating panel 2) and on-off valves (thermal motions) provided in the supply paths to the plurality of heating terminals. A temperature control unit 1 that circulates and supplies the temperature adjustment liquid (temperature adjustment water 8) to these heating terminals, and a heat pump unit 5 that heats the temperature adjustment liquid that circulates through the temperature adjustment unit 1. Based on the first high pressure suppression value (first high pressure suppression value Ds1) used for the control for suppressing the high pressure of the heat pump unit, the operation in the first operation mode for controlling the operation of both units, and all during operation And a second high pressure suppression value (second high pressure) which is a value used for control for suppressing the high pressure of the heat pump unit 5 and is higher than the first high pressure suppression value. Based on the suppression value Ds2) Operation and is possible in the second operating mode for controlling the operation of the unit.

  According to this configuration, when the open / close valves of all the heating terminals (thermal valves 52) in operation are fixed open, the flow rate of the temperature adjustment liquid (temperature adjustment water 8) becomes substantially constant. Since the high pressure of the heat pump unit 5 changes with a change in the flow rate of the temperature adjustment liquid, if the flow rate is kept constant, the fluctuation range of the high pressure of the heat pump unit 5 can be reduced. When the fluctuation range of the high pressure is reduced, the high pressure suppression value (from the first high pressure suppression value Ds1 to the second high pressure suppression value Ds2) used for the control for suppressing the high pressure can be increased. Can increase the high pressure and the temperature thereof, and as a result, the temperature of the temperature adjustment liquid can be increased. Therefore, the operation in the second operation mode can ensure the reliability and the high temperature requirement of the user. It can correspond to.

  An operation unit (remote controllers 46 and 47) for operating the temperature control unit 1 and the heat pump unit 5 is provided, and the operation in the second operation mode is started by a predetermined operation on the operation unit (remote controllers 46 and 47). With this configuration, since the operation in the second operation mode is started by a predetermined operation by the user on the operation unit (remote controllers 46 and 47), the user can respond to a higher temperature request at an appropriate timing. be able to.

  When the operation in the second operation mode is started, when the predetermined time has elapsed from the start of the operation, the operation is switched to the operation in the first operation mode. When a predetermined time elapses, the operation in the second operation mode is switched to the operation in the first mode, so that the operation in the second mode can be automatically terminated.

  Control means (control unit) for controlling the operation of the temperature control unit 1 and the heat pump unit 5 to control the temperature of the heating terminal (floor heating panel 2) based on the set temperature set for each heating terminal (floor heating panel 2) 60), and the temperature control unit 1 has a circulation pump 9 disposed on the upstream side of the on-off valve (thermal valve 52), and a plurality of control means are used in the operation in the first operation mode. When the set temperature of at least one of the heating terminals is different from that of the other heating terminals, the opening / closing valves of the heating terminals other than the heating terminal having the highest setting temperature are intermittently controlled and circulated. If the circulation pump 9 is controlled so that the number of rotations of the pump 9 is larger when the on-off valve is in the closed state than when the on-off valve is in the open state, the on-off valve (thermal valve 52) is controlled. ) Is open When the flow rate of the liquid adjustment (temperature control water 8) increases and the flow rate of the temperature adjustment solution decreases when the on-off valve is closed, the flow rate of the temperature adjustment liquid significantly varies with the opening and closing of the on-off valve. However, since the rotation of the circulation pump 9 is controlled so that it is larger when the on-off valve is closed than when it is open, the temperature is adjusted so as to cancel the increase or decrease in the flow rate of the temperature adjusting liquid. Regardless of the amount of fluctuations in the amount of circulation of the temperature adjustment liquid, the fluctuation range of the amount of circulation of the temperature adjustment liquid can be reduced. 5 stable operations can be provided.

  The temperature adjustment unit 1 includes a flow sensor 50 that detects the flow rate of the temperature adjustment liquid flowing through the heat exchanger (hydrothermal exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) is heated by the heat pump unit 5, and is controlled. If the means (control unit 60) is configured to control the circulation pump 9 in a direction to reduce the fluctuation of the flow rate detected by the flow sensor 50, the flow rate will fluctuate due to opening and closing of the on-off valve (thermal valve 52). Nevertheless, the flow rate of the temperature adjustment liquid flowing through the heat exchanger (water heat exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) is heated by the flow sensor 50 and the circulation pump 9 is substantially constant. Therefore, the amount of heat transfer from the refrigerant to the temperature control liquid in this heat exchanger can be stabilized, and a stable operation of the heat pump unit 5 can be provided.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

(Second Embodiment)
For example, the floor heating apparatus according to the second embodiment will be described with reference to FIG. 7. In the process of C4, the flow rate of the temperature-controlled water 8 flowing to the hydrothermal exchanger 16 is detected using the flow rate sensor 50. However, instead, the condensing temperature in the hydrothermal exchanger 16 is detected using the hydrothermal exchange temperature detection thermistor 36, and in the process of C5, the rotational speed of the circulation pump 9 in a direction to reduce the fluctuation of the detected condensing temperature. May be set.

  As described above, the temperature control unit 1 includes the temperature sensor (hydrothermal exchange temperature detection thermistor) disposed in the heat exchanger (hydrothermal exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) is heated by the heat pump unit 5. 36), and the control means (control unit 60) is configured to control the circulation pump 9 in a direction to reduce the fluctuation of the temperature detected by the temperature sensor. According to this configuration, the temperature of the heat exchanger (water heat exchanger 16) is maintained almost constant even though the flow rate is going to fluctuate due to opening and closing of the on-off valve (thermal valve 52). The amount of heat transferred from the refrigerant to the temperature control liquid in the heat exchanger can be stabilized, and a stable operation of the heat pump unit 5 can be provided.

(Third embodiment)
Furthermore, about the floor heating apparatus which is 3rd Embodiment, if it demonstrates using FIG.11 and FIG.12, the high voltage | pressure suppression process routine at the time of intermittent operation shown in FIG. By being executed, a part of the compressor control unit 68 and a part of the heat pump unit control unit 62 are realized.

  That is, when the intermittent operation high pressure suppression processing routine is executed, first, the microcomputers 32 to 33 determine whether or not the intermittent operation is being performed (D1), and wait until it is determined that the intermittent operation is being performed. (D1: NO). When it is determined that the operation is intermittent (D1: YES), the microcomputers 32 to 33 specify the scheduled opening / closing time of the thermal valve 52 (D2). Next, the microcomputers 32 to 33 determine whether or not the current time is after a time before the predetermined time TL from the scheduled time for switching the thermal valve 52 from the open state to the closed state (D3). Wait until it is determined that it is after the time point before the predetermined time TL (D3: NO). When it is determined that the current time is after the time point before the predetermined time TL from the scheduled time for switching the thermal valve 52 from the open state to the closed state (D3: YES), the microcomputers 32 to 33 are connected to the compressor 21. The rotational speed is lowered from the rotational speed R4 in the open state of the thermal valve 52 to a rotational speed R5 lower than the rotational speed R4 (D4), and the process returns to the execution of D1.

  Changes in the actuators (thermal valves 52b to 52d, the compressor 21) and the condensation temperature due to the execution of the intermittent operation high pressure suppression processing routine will be described with reference to FIG. When the temperature control unit 1 and the heat pump unit 5 are operated and the thermal valves 52b to 52d in the low temperature setting area are in the open state, the rotation speed of the compressor 21 is driven at the rotation speed R4, and the water heat The condensation temperature detected by the alternating temperature detection thermistor 36 is controlled so as to be approximately the first high pressure suppression value Ds1. Here, at the time before the predetermined period TL from the time when the thermal valves 52b to 52d are changed from the open state to the closed state, the rotational speed of the compressor 21 is decreased from the rotational speed R4 to the lower rotational speed R5. Then, in connection with this, the output of the heat pump unit 5 falls and the condensation temperature is lowered in advance. Then, when the thermal valves 52b to 52d are changed from the open state to the closed state, the flow rate of the temperature-controlled water 8 flowing through the water heat exchanger 16 is decreased and the condensation temperature is increased.

  As described above, the heat pump unit 5 includes the compressor 21 that compresses the refrigerant supplied to the heat exchanger (water heat exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) of the temperature adjustment unit 1 is heated. The control means (control unit 60) is configured such that when the on-off valve (thermal valve 52) is changed from the open state to the closed state, the rotation speed of the compressor 21 is higher than that when the on-off valve is open. The compressor 21 is configured so as to be smaller when is closed. According to this configuration, the flow rate tends to increase when the on / off valve is opened by opening / closing the on / off valve, and the flow rate tends to decrease when the on / off valve is closed. In order to control the operation of the heat pump unit 5 and reduce the increase in high pressure, it is possible to change the on-off valve (thermal valve 52) from the open state to the closed state while ensuring the reliability of the heat pump unit 5. it can.

(Fourth embodiment)
Furthermore, about the floor heating apparatus which is 4th Embodiment, when it demonstrates instead of FIG.11 and FIG.12, in the process of D4 of the high voltage | pressure suppression process routine at the time of an intermittent operation shown in FIG. Instead of lowering the predetermined amount, the rotational speed of the evaporator fan 19a disposed in the vicinity of the outdoor heat exchanger 19 is decreased from the rotational speed R6 when the thermal valve 52 is open to a rotational speed R7 lower than the rotational speed R6. Also good. FIG. 12 (b) shows changes in the actuators (thermal valves 52b to 52d, the evaporator fan 19a) and the condensation temperature due to the execution of the intermittent operation high-pressure suppression processing routine. The same as the case of the machine 21.

  Thus, the heat pump unit 5 is an evaporator (outdoor heat) that evaporates the refrigerant supplied to the heat exchanger (water heat exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) of the temperature adjustment unit 1 is heated. And a fan (evaporator fan 19a) disposed in the vicinity of the evaporator (outdoor heat exchanger 19), and the control means (control unit 60) has an on-off valve (thermal valve 52) opened. When changing from the state to the closed state, the fan (evaporator fan 19a) has a lower rotational speed when the on-off valve is closed than when the on-off valve is open. The evaporator fan 19a) is configured to be controlled. According to this configuration, the flow rate tends to increase when the on-off valve is opened due to opening / closing of the on-off valve, and the flow rate tends to decrease when the on-off valve is closed. ) To control the operation of the heat pump unit 5 and reduce the increase in high pressure, so that the reliability of the heat pump unit 5 is secured and the on-off valve (thermal valve 52) is closed from the open state. Can be changed.

(Fifth embodiment)
Furthermore, about the floor heating apparatus which is 5th Embodiment, when FIG.11 and FIG.12 is substituted, in the process of D4 of the high voltage | pressure suppression process routine at the time of an intermittent operation shown in FIG. 11, the rotation speed of the compressor 21 is set. Instead of lowering the predetermined amount, the opening degree of the electric expansion valve 22 of the decompression mechanism 22 may be opened from the opening degree O2 in the opened state of the thermal valve 52 to an opening degree O1 larger than the opening degree O2. FIG. 12 (c) shows changes in the respective actuators (thermal valves 52b to 52d, electric expansion valve 22) and the condensation temperature due to the execution of the intermittent operation high-pressure suppression processing routine. It is almost the same as the case of the machine 21.

  Thus, the heat pump unit 5 is an evaporator (outdoor heat) that evaporates the refrigerant supplied to the heat exchanger (water heat exchanger 16) in which the temperature adjustment liquid (temperature adjustment water 8) of the temperature adjustment unit 1 is heated. And a valve mechanism (electric expansion valve 22) disposed upstream of the evaporator (outdoor heat exchanger 19). The control means (control unit 60) includes an on-off valve (thermal valve 52). ) Is changed from the open state to the closed state, the opening degree of the valve mechanism (electric expansion valve 22) is larger when the open / close valve is closed than when the open / close valve is open. In addition, the valve mechanism (electric expansion valve 22) is configured to be controlled. According to this configuration, the flow rate tends to increase when the on-off valve is opened by opening / closing of the on-off valve, and the flow rate tends to decrease when the on-off valve is closed. In order to suppress the operation of the heat pump unit 5 by controlling the opening degree of 22) and reduce the increase in high pressure, it is possible to change the on-off valve from the open state to the closed state while ensuring the reliability of the heat pump unit 5. it can.

(Sixth embodiment)
Furthermore, the floor heating apparatus which is 6th Embodiment is demonstrated using FIG. FIG. 13 is a diagram illustrating the voltage applied to the valve body in the thermal valves 52b to 52d in the low temperature setting area and the actual opening of the thermal valve. The thermal valve 52b heats and expands the valve body by energizing the electric heater, and performs an opening operation by the expansion of the valve body. And in (a) of FIG. 13, when switching the thermal valve 52b-52d from an open state to a closed state, it is between 200V-0V from the state which is supplying with 200V to the state which stops supplying. Is energized for a predetermined time at a certain predetermined voltage, and then the energization is stopped. Thus, the applied voltage per unit time to the electric heater is changed stepwise. Further, as shown in FIG. 13B, the energization of the electric heater may be intermittently repeated by turning on / off the energization from the state where the energization is performed at 200 V to the state where the energization is stopped. The thermal valve 52 is a non-excitation non-actuated type that heats and expands the valve body by energizing the electric heater and opens by the expansion of the valve body. An excitation operation type may be used.

  As described above, when the voltage applied to the electric heater per unit time is changed stepwise or the energization of the electric heater is intermittently performed, the open state is changed to the closed state as compared with the time T1 required for the closed state from the conventional open state. Since the time T2 required is lengthened and the rapid fluctuation of the high pressure is reduced, the open / close valve can be changed from the open state to the closed state while ensuring the reliability of the heat pump unit.

(Seventh embodiment)
Furthermore, the floor heating apparatus which is 7th Embodiment is demonstrated using FIGS. 14-16. The operation mode determination processing routine shown in FIG. 14 is executed by the microcomputers 32 to 33 instead of the processing routine shown in FIG. The routine shown in FIG. 14 is substantially the same as the routine shown in FIG. 4, but is different in that the processes of S7 to S10 are added.

  That is, in the process of S6, after the microcomputers 32 to 33 determine that the first operation mode (normal mode) is performed, the process of S7 is executed. In the process of S7, the microcomputers 32 to 33 determine whether or not a predetermined long cycle request operation has been performed by the remote controllers 46 and 47 (S7). If it is determined that the long cycle request operation has not been performed (S7: NO), the microcomputers 32 to 33 return to the execution of the process of S1. On the other hand, when it is determined that the long cycle request operation has been performed (S7: YES), the microcomputers 32 to 33 determine that the temperature control unit 1 and the heat pump unit 5 are operated in the long cycle mode (S8). . Next, the microcomputers 32 to 33 determine whether or not a predetermined time has elapsed after determining to perform the long cycle mode (S9), and wait until the predetermined time elapses (S9: NO). If it is determined that the predetermined time has elapsed (S9: YES), the microcomputers 32 to 33 determine to perform the first operation mode (normal mode) (S6), and return to the execution of the process of S1.

  As described above, the operation mode determination unit 63 performs the first operation mode (also referred to as the normal mode), the second operation mode (not the normal mode), and the predetermined operation on the operation unit (remote controllers 46 and 47). Decide to perform any of the long-cycle operation modes.

  Further, the microcomputers 32 to 33 perform the intermittent operation control process that is the process of B7 in the temperature control process routine shown in FIG. 6 by executing the intermittent operation control process routine shown in FIG.

That is, when the intermittent operation control processing routine is executed, first, the microcomputers 32 to 33 open and close the open / close cycle of the thermal valve 52 in the low temperature setting area based on the set temperature of the floor heating panel 2 that is the operation target. The period Tc1 is determined (E1). Next, the microcomputers 32 to 33 determine whether or not the operation mode determination unit 63 has determined that the temperature control unit 1 and the heat pump unit 5 are operated in the long cycle mode (E2). When it is determined that the operation is performed in the long cycle mode (E2: YES), the microcomputers 32 to 33 have the open / close cycle of the thermal valve 52 longer than the open / close cycle Tc1 based on the determined open / close cycle Tc1. The opening / closing cycle Tc2 is determined. Specifically, the open / close cycle Tc2 is determined by adding a predetermined time to the open / close cycle Tc1 determined in the processing of E1 or multiplying the open / close cycle Tc1 by a predetermined coefficient. Next, the thermal valve 52 is opened / closed according to the determined opening / closing cycle (opening / closing cycle Tc1 or opening / closing cycle Tc2) (E4), and the process returns to E1. In this case, Ton and Toff are determined while making the opening / closing time ratio approximately the same.
On the other hand, in the process of E2, when it is not determined to perform the long cycle mode (E2: NO), the microcomputers 32 to 33 execute the process of E4 under the condition that the open / close period is the open / close period Tc1. To do.

  By executing the above operation mode determination processing routine and intermittent operation control processing routine, as shown in FIG. 16, the thermal valve in the low temperature setting area in the normal mode (first operation mode) is opened and closed at the open / close cycle Tc1. In other words, the opening and closing of the thermal valve in the low temperature area in the long cycle mode is performed at the opening / closing cycle Tc2, which is longer than the opening / closing cycle Tc1.

  As described above, the control means (control unit 60) is configured to be able to perform the operation in the normal mode and the long cycle mode in which the opening and closing of the on-off valve (thermal valve 52) is intermittently controlled. The opening / closing cycle Tc2 of the opening / closing valve (thermal valve 52) in the operation in is set longer than the opening / closing cycle Tc1 of the opening / closing valve (thermal valve 52) in the operation in the normal mode. According to this configuration, the flow rate of the temperature adjustment liquid (temperature adjustment water 8) is disturbed every time the on-off valve (thermal valve 52) is opened and closed, and a predetermined time is required until the disturbed flow rate is stabilized. Operation control may be difficult in the normal mode, but in the long cycle mode, the open / close cycle for opening and closing the open / close valve (thermal valve 52) is set longer than in the normal mode. In some cases, the frequency of water 8) flow rate disturbance is reduced, and control of operation becomes easier. Since the opening / closing time ratio (Ton / (Ton + Toff)) is approximately the same, fluctuations in the average bed temperature can be kept small.

  Moreover, the operation part (remote control 46, 47) for operating the temperature control unit 1 and the heat pump unit 5 is provided, and the operation in the long cycle mode is started by a predetermined operation on the operation part (remote control 46, 47). It is configured as follows. According to this configuration, since the operation in the long cycle mode is started by a predetermined operation by the user at the operation unit, it is possible to respond to the user's request at an appropriate timing.

  By using the present invention, it is possible to provide a heating apparatus that ensures the reliability while performing an intermittent operation in which the floor temperature in the low temperature setting area is appropriately set.

100 Floor heating system (heating system)
1 Temperature control unit 2, 2a-2d Floor heating panel (heating terminal)
5 Heat pump unit 8 Temperature control water (temperature control liquid)
9 Circulation pump 16 Water heat exchanger (heat exchanger that heats the temperature control liquid)
19 Outdoor heat exchanger (evaporator)
19a Evaporator fan (fan located near the evaporator)
21 Compressor 22 Electric expansion valve (valve mechanism)
36 Hydrothermal temperature detection thermistor (temperature sensor)
46, 47 Remote control (operation unit)
50 Flow sensors 52, 52a to 52d Thermally operated valves (open / close valves)
60 Control unit (control means)

Claims (9)

Multiple heating terminals,
A temperature control unit that includes an on-off valve provided in each supply path to the plurality of heating terminals, and a circulation pump disposed upstream of the on-off valve, and circulates and supplies the temperature adjustment liquid to the heating terminals; ,
A heat pump unit for heating the temperature adjustment liquid circulating in the temperature adjustment unit;
Control means for controlling the operation of the temperature control unit and the heat pump unit, and controlling the temperature of the heating terminal based on a set temperature set for each heating terminal;
When the set temperature of at least one heating terminal among the plurality of heating terminals is a set temperature different from other heating terminals, the control means is configured to control the opening / closing valve of the heating terminal other than the heating terminal having the highest set temperature. And intermittently controlling opening and closing, and controlling the circulation pump so that the number of rotations of the circulation pump is larger when the on-off valve is closed than when the on-off valve is open. Heating device characterized. The temperature adjustment unit includes a flow rate sensor that detects a flow rate of the temperature adjustment liquid flowing through a heat exchanger in which the temperature adjustment liquid is heated by the heat pump unit,
The heating device according to claim 1, wherein the control means controls the circulation pump in a direction to reduce the fluctuation of the flow rate detected by the flow sensor. The temperature adjustment unit includes a temperature sensor disposed in a heat exchanger in which the temperature adjustment liquid is heated by the heat pump unit,
The heating device according to claim 1 or 2, wherein the control means controls the circulation pump in a direction to reduce the fluctuation of the temperature fluctuation detected by the temperature sensor. The heat pump unit includes a compressor that compresses refrigerant supplied to a heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated,
When the on-off valve is changed from the open state to the closed state, the control means is configured such that the rotation speed of the compressor is higher when the on-off valve is in the closed state than when the on-off valve is in the open state. The heating device according to any one of claims 1 to 3, wherein the compressor is controlled so as to be small. The heat pump unit includes an evaporator for evaporating a refrigerant supplied to a heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated, and a fan disposed in the vicinity of the evaporator,
When the on-off valve is changed from the open state to the closed state, the control means is such that the rotation speed of the fan is greater when the on-off valve is in the closed state than when the on-off valve is in the open state. The heating device according to any one of claims 1 to 4, wherein the fan is controlled to be small. The heat pump unit includes an evaporator for evaporating a refrigerant supplied to a heat exchanger in which the temperature adjustment liquid of the temperature adjustment unit is heated, and a valve mechanism disposed on the upstream side of the evaporator,
When the on-off valve is changed from the open state to the closed state, the control means is configured such that the opening degree of the valve mechanism is greater when the on-off valve is in the closed state than when the on-off valve is in the open state. The heating device according to any one of claims 1 to 5, wherein the valve mechanism is controlled so as to increase. The on-off valve is a thermal valve that heats and expands the valve body by energizing an electric heater, and performs an opening operation or a closing operation by the expansion of the valve body,
The control means, when the on-off valve is changed from an open state to a closed state, by changing the applied voltage per unit time to the electric heater stepwise or intermittently energizing the electric heater, The heating device according to any one of claims 1 to 6, wherein the on-off valve is changed to a closed state. The control means is configured to be able to operate in a normal mode and a long cycle mode for intermittently controlling opening and closing of the on-off valve,
The opening / closing cycle of the on-off valve in the operation in the long cycle mode is set to be longer than the opening / closing cycle of the on-off valve in the operation in the normal mode while making the opening / closing time ratio approximately the same. The heating device according to any one of 7. An operation unit for operating the temperature control unit and the heat pump unit;
The heating apparatus according to claim 8, wherein the operation in the long cycle mode is started by a predetermined operation at the operation unit.

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