JP6628576B2 - Heating system - Google Patents

Description

  The present invention relates to a heating device having a tank for storing a secondary refrigerant.

  2. Description of the Related Art Conventionally, there is a hot water storage type heating device that uses a heat pump circuit using a primary refrigerant as a heat source device, exchanges heat with a secondary refrigerant such as water or brine, and performs cooling and heating air conditioning with the secondary refrigerant. Japanese Patent Application Laid-Open No. 2007-163071 discloses a configuration in which a buffer tank is provided in a secondary refrigerant circuit in such a hot water storage type heating device. The heat storage liquid in the buffer tank provided in the circuit is used to cover the low capacity at the start of the compressor and to speed up the start of air conditioning.

JP 2007-163071 A

When a low heating capacity is required in the hot water storage type heating device, the high-temperature water is returned to the hot water storage tank in a state where it is not sufficiently cooled, and the operating efficiency of the hot water storage type water heater may be reduced. In particular, the efficiency of the CO ₂ water heater significantly decreases as the temperature of incoming water during the boiling operation increases. In the technique disclosed in Japanese Patent Application Laid-Open No. 2007-163071, no consideration is given to a rise in incoming water temperature during a boiling operation when performing low-capacity heating.

  The present invention has been made in order to solve the above problems, and in particular, in a heating device that heats a secondary refrigerant by using a heat pump heat source device that uses carbon dioxide as a refrigerant and uses it for heating, a heat pump heat source device It is an object of the present invention to provide a technology that enables high-efficiency operation.

  The heating device according to the present invention is a heat pump heat source device using a primary refrigerant, a main tank storing a secondary refrigerant heated by the heat pump heat source device, a radiator, a main tank, and a radiator are connected, A flow path through which the secondary refrigerant flows.

  The flow path has a first closed circuit and a second closed circuit. The first closed circuit is connected to the main tank and the radiator, and is a closed circuit for replacing the secondary refrigerant inside the radiator with the secondary refrigerant inside the main tank. The second closed circuit is a closed circuit that circulates the secondary refrigerant of the radiator without passing through the main tank. The amount of the secondary refrigerant circulating in the second closed circuit is smaller than the amount of the secondary refrigerant circulating in the first closed circuit.

  According to the present invention, even if the heat release amount required by the radiator is small, the temperature of the secondary refrigerant is reduced by the second closed circuit, and then the secondary refrigerant is transferred from the radiator to the main tank by the first closed circuit. It is possible to return to.

  Therefore, by keeping the temperature of the secondary refrigerant sent from the main tank to the heat pump type heat source unit at a predetermined temperature or lower, the high efficiency secondary refrigerant is boiled at the time of boiling in the heat pump type heat source unit, so that low efficiency operation is achieved. Can be prevented.

  Also, by changing the lowering range (initial temperature and terminal temperature) for lowering the temperature of the secondary refrigerant by the second closed circuit, the average heating capacity can be changed, and small-capacity heating can be supported. Therefore, it is possible to provide an effective heating device for a low-load heating application such as for a high-insulation and airtight house.

It is a figure showing composition of a hot-water storage type heating device of an embodiment of the invention. It is a figure which shows the relationship between the incoming water temperature of a heat source unit, and efficiency. It is a figure which shows the state in which water circulates through a 1st closed loop. It is a figure showing a state where water circulates through the second closed loop. It is a flowchart for demonstrating the switching control of the flow path of a hot-water storage type heating apparatus. It is a figure which shows the relationship between the switching timing of operation mode A and B, and the change of water temperature. It is a figure which shows the modification at the time of replacing a radiator part with the heat radiation circuit containing another loop.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings below, the same or corresponding portions have the same reference characters allotted, and description thereof will not be repeated.

  FIG. 1 is a diagram showing a configuration of a hot water storage type heating apparatus according to an embodiment of the present invention. Referring to FIG. 1, hot water storage type heating apparatus 100 includes remote controller 7, radiator 4, hot water storage unit 20, and heat source unit 30. Hot water storage unit 20 supplies hot water to mixing tap 6 and performs heating by circulating hot water through radiator 4. The mixing tap 6 is a hot water supply terminal that mixes hot water such as a faucet with water and discharges water at an appropriate temperature.

Although not shown, the heat source unit 30 is a heat pump heat source device including a compressor, an air heat exchanger, a water heat exchanger, and the like. The refrigerant (primary refrigerant) used by the heat source unit 30 is a gas refrigerant, for example, CO ₂ or an HFC-based refrigerant.

  Hot water storage unit 20 includes a hot water storage tank 1, a hot water supply mixing valve 2, a three-way valve 3, a buffer tank 5, a control unit 10, temperature sensors 12A to 12D, 13A to 13E, and pumps 14A and 14B.

  Hot water storage tank 1 is, for example, a stainless steel tank of about 370 liters having a heat insulating material around. The capacity of the buffer tank 5 is smaller than the capacity of the hot water storage tank 1, for example, about several liters. The hot water mixing valve 2 and the three-way valve 3 can be operated by the control unit 10 with the valve opening degree by a stepping motor or the like.

  The radiator 4 is, for example, a radiator panel, a floor heating panel, a fan coil, or the like. When the radiator 4 is a fan coil, a fan (not shown) is provided, and the air volume of the fan is variably controlled. The refrigerant (secondary refrigerant) used by the radiator 4 is water in the configuration shown in FIG. In a configuration in which the mixing tap 6 is not connected, brine (antifreeze) or the like can be used as the secondary refrigerant.

  The remote controller 7 has an input unit 7A for inputting a command from a user regarding a heating operation command, a hot water supply temperature, and the like, and a screen display unit 7B for providing information to the user. Although not shown, the control unit 10 is configured to include a microcomputer, a memory, and the like, collects information of each sensor (temperature sensors 12A to 12D, 13A to 13E), and collects information of each actuator (pumps 14A, 14B, hot water supply mixing valve). By outputting control signals to the two- and three-way valves 3), the entire hot-water storage type heating device 100 is controlled.

  The temperature sensors 12A to 12D and 13A to 13E are sensors such as thermistors for detecting temperatures. The pumps 14A and 14B are pumps for circulating water. Hot water storage unit 20 is a box-shaped unit that accommodates hot water storage tank 1, control unit 10, and the like.

(Boiling operation)
The hot water storage type heating apparatus 100 sends low-temperature water to the heat source unit 30 by the pump 14B from the lower part of the hot water storage tank 1 mainly at night, and heats the low-temperature water in the heat source unit 30 to return to the upper part of the hot water storage tank 1. The high-temperature water in the hot water storage tank 1 is directly used by hot water supply from the mixing tap 6 and is also used as a heat source for heating by the radiator 4.

  At the start of boiling, the high-temperature water in the hot water storage tank 1 is consumed, and low-temperature water close to the temperature of tap water is stored in the lower part of the tank. By operating the pump 14B, the low-temperature water is heated to the high-temperature water by the water heat exchanger in the heat source unit 30. The heated high-temperature water is returned to the upper part of the hot water storage tank. In the hot water storage tank 1, lamination boiling in which the upper portion becomes high-temperature water and the lower portion becomes low-temperature water across the temperature boundary layer is performed. When the boiling amount increases and the area of the high-temperature water increases, the temperature boundary layer approaches the lower part of the hot water storage tank 1 and the incoming water temperature of the heat source unit 30 gradually increases.

(Hot water supply operation)
In accordance with the use of hot water at the mixing tap 6 which is a hot water supply terminal, the hot water mixing valve 2 mixes the high temperature water in the upper part of the hot water storage tank 1 and the low temperature water from the tap water source to a set temperature (for example, 40). ° C) and supplied from the mixing tap 6. When tap water is supplied to the lower part of the hot water storage tank 1 in accordance with the decrease of the high-temperature water discharged from the upper part of the hot water storage tank 1, the temperature boundary layer moves upward in the tank. In this way, the hot water stored in hot water storage tank 1 is directly consumed, and when the amount of high-temperature water decreases, additional heating is performed by heat source unit 30. In addition, boiling is performed at midnight according to the amount of use.

(Heating operation)
In the hot water storage type heating apparatus 100 shown in FIG. 1, the temperature of water entering the hot water storage tank 1 during the heating operation greatly affects the energy efficiency of the heat pump type heat source unit 30. This effect will be described below.

FIG. 2 is a diagram illustrating a relationship between the incoming water temperature of the heat source unit and the efficiency. As shown in FIG. 2, as a characteristic of the heat pump of the heat source unit 30, as the incoming water temperature increases, the COP (efficiency = heating capacity ＝ input) deteriorates. This tendency is remarkable when the refrigerant is CO ₂ using a supercritical region. For this reason, in the heat pump type heat source unit using the CO ₂ refrigerant, it is important to keep the incoming water temperature low, that is, to keep the water temperature below the hot water storage tank 1 low in order to keep the system efficiency high. However, when the heating capacity is set low, the temperature of the high-temperature water supplied from the hot-water storage tank 1 to the radiator 4 is less likely to decrease, and the temperature of the water returning from the radiator 4 tends to increase.

  Thus, in the present embodiment, control is performed so that the temperature of water entering the hot water storage tank 1 during heating is not too high. Specifically, in hot water storage type heating device 100 of the present embodiment, flow path 22 for flowing water through hot water storage tank 1, buffer tank 5, and radiator 4 has a first closed loop (closed circuit) and a second closed loop. It is configured to be able to form a closed loop (closed circuit).

  At the time of the heating operation using the radiator 4, the control unit 10 guides the high-temperature water of the hot water storage tank 1 as a heat source to the radiator circuit formed by the buffer tank 5, the radiator 4, and the pump 14A (hereinafter, referred to as a first operation mode). , "Operation mode A") and a second operation mode (hereinafter, referred to as "operation mode B") in which high-temperature water is circulated in the radiator circuit and heat is radiated (ie, heated) by the radiator 4. By this switching, the high-temperature water introduced from the hot-water storage tank 1 is gradually cooled by the radiator circuit by the low-capacity heating and is sufficiently lowered before returning to the hot-water storage tank 1. Can be.

  FIG. 3 is a diagram showing a state where water circulates in the first closed loop. Referring to FIG. 3, first, “operation mode A” in which water circulates in the first closed loop of hot water storage type heating device 100 will be described. In FIG. 3, the three-way valve 3 is set to the state SA. The first closed loop introduces the water from the hot water storage tank 1 into the buffer tank 5 through the flow path 22A, and transfers the water in the buffer tank 5 through the flow path 22B, the radiator 4, the flow path 22C, the pump 14A, the three-way valve 3, This is a closed loop for returning to the hot water storage tank 1 via the flow path 22E.

  In the “operation mode A”, the three-way valve 3 is fixed to the state SA shown in FIG. In the state SA, water does not flow from the flow path 22D to the buffer tank 5. Thus, a first closed loop configured to return to the upper portion of the hot water storage tank 1, the buffer tank 5, the radiator 4, the pump 14A, the three-way valve 3, and the lower portion of the hot water storage tank 1 is formed. In FIG. 3, the direction in which water circulates in the first closed loop is indicated by arrows. Thereby, the high-temperature water in the upper part of the hot water storage tank 1 flows into the buffer tank 5 and the radiator 4, the temperature of the water circulated through the radiator 4 rises, and the heating operation becomes possible.

  In the example of FIG. 3, since high-temperature water flows into the lower part of the buffer tank 5, due to the buoyancy of the water (the higher the temperature of the water, the lighter the high-temperature water moves upward and the low-temperature water moves downward). The overall temperature rises almost uniformly. For this reason, it is possible to raise the water supply temperature to the radiator 4 to an appropriate temperature without abruptly increasing the temperature. When the radiator 4 has a temperature upper limit, the temperature of the water supply can be controlled by monitoring the temperature with the temperature sensor 12C. When there is no temperature limit, a flow path is formed so that high-temperature water from the hot water storage tank 1 is returned to the upper part of the buffer tank 5, and a high-temperature water area is formed at the upper part of the buffer tank 5 by forming a temperature stratification. By forming it, it is also possible to keep the hot water supply time long.

  FIG. 4 is a diagram showing a state where water circulates in the second closed loop. With reference to FIG. 4, "operation mode B" in which water circulates in the second closed loop of hot water storage type heating device 100 will be described. In FIG. 4, the three-way valve 3 is set to the state SB. The second closed loop introduces water from the buffer tank 5 to the radiator 4 and transfers the water cooled by the radiator 4 via the pump 14A and the three-way valve 3 without passing through the hot water storage tank 1 to the buffer tank. This is a closed loop returning to 5. In FIG. 4, the direction in which water circulates in the second closed loop is indicated by arrows.

  In the “operation mode B”, the three-way valve 3 is fixed to the state SB shown in FIG. In state SB, water does not flow through flow path 22E leading to hot water storage tank 1. As a result, the water sent from the buffer tank 5 returns to the buffer tank 5 via the flow path 22B, the radiator 4, the flow path 22C, the pump 14A, the three-way valve 3, and the flow path 22D in the second closed loop. Is configured. Thus, the heating operation of the radiator 4 is continued in the “operation mode B” using the high-temperature water stored in the buffer tank in the “operation mode A” as a heat source. Since the operation is performed in the second closed loop, the circulating water in the second closed loop does not affect the water in the hot water storage tank 1.

  In the example of FIG. 4, low-temperature water from the radiator 4 returns to the upper part of the buffer tank 5. For this reason, the water inside the buffer tank 5 is uniformly cooled in the vertical direction. This makes it possible to gradually change the water supply temperature to the radiator 4. By lowering the return position to the buffer tank, a temperature stratification is formed in the tank, a high temperature range is maintained, and a temperature for sending water to the radiator 4 can be kept high.

  FIG. 5 is a flowchart for explaining switching control of the flow path of the hot water storage type heating device. Referring to FIGS. 3 to 5, when the start of the heating operation is instructed by an operation from remote controller 7 or the like, operation of pump 14A is started in step S1. Note that the system can be operated in cooperation with a smartphone or the like, and an external remote operation may be performed through a smartphone or the like instead of the remote controller 7.

  Subsequently, in step S2, the temperature T of the water flowing out of the radiator 4 is measured by the temperature sensor 12A. The control unit 10 determines whether the water temperature T is lower than the target temperature Tr. Here, the target temperature Tr is a target temperature of the water returning to the hot water storage tank 1.

  When T <Tr is satisfied (YES in S2), the process proceeds to step S3, "operation mode A" is selected, and the flow path 22 is configured to circulate water in the first closed loop shown in FIG. It becomes. As a result, low-temperature water having a temperature equal to or lower than the temperature Tr returns to the hot water storage tank 1.

  On the other hand, if T ≧ Tr (NO in S2), the process proceeds to step S4, and control unit 10 determines whether or not water temperature T is higher than switching temperature Tset of the three-way valve. If T> Tset (YES in S4), the process proceeds to step S5, and “operation mode B” is selected. In the operation mode B, the flow path 22 has a configuration in which water circulates in the second closed loop 22S illustrated in FIG. In this case, high-temperature water does not return into the tank.

  When T ≦ Tset (NO in S4), if the operation mode is “operation mode A”, the operation mode is fixed at “operation mode A”, and the hot water is stored via the radiator 4. The “operation mode A” is maintained until the high-temperature water from the tank 1 reaches the temperature sensor 12A and the condition T> Tset is satisfied.

  After the process proceeds to step S5 and the operation mode is set to "operation mode B", the radiator 4 remains in the "operation mode B" until the condition that T <Tr is satisfied in step S2 again. The heat dissipation operation is performed.

  FIG. 6 is a diagram showing the relationship between the switching timing of the operation modes A and B and the change in the water temperature. In FIG. 6, the horizontal axis represents time, and the vertical axis represents water temperature T.

  First, from time t0 to t1, the hot water radiation operation by the radiation closed circuit (second closed loop 22S) in “operation mode B” in FIG. 4 is executed. When the temperature of the circulating water gradually decreases and T <Tr at time t1 (YES in S2 of FIG. 5), the three-way valve 3 is switched, and the operation mode is switched from “operation mode B” to “operation mode A”. .

  From time t1 to t2, an operation of returning low-temperature water to hot water storage tank 1 in operation mode A is performed. Then, when the high-temperature water in the hot water storage tank 1 is introduced into the buffer tank 5, the water temperature in the buffer tank 5 rises. When the water from the buffer tank 5 reaches the position of the temperature sensor 12A via the radiator 4, the water temperature T is raised. When water temperature T rises again and T> Tset at time t2 (YES in S4 of FIG. 5), the operation mode is switched from "operation mode A" to "operation mode B". In the operation mode B, the hot water radiating operation in which the water in the buffer tank circulates with the radiator 4 without passing through the hot water storage tank 1 is performed.

  In FIG. 6, the water temperature T starts increasing at some time after switching the three-way valve from SB to SA at time t1, and the water temperature T after a while after switching the three-way valve from SA to SB at time t2. Has begun to descend. This is because a delay is caused by the time required for water to pass through the radiator 4 and reach the temperature sensor 12A, and by the reaction time due to the heat capacity of the heat exchanger and the piping.

  By repeating the operations of the “operation mode A” and the “operation mode B”, the radiator 4 can realize a heating operation with relatively low capacity.

  Here, the heating capacity of the radiator 4 can be changed by changing the setting of Tset. That is, the heating capacity of the radiator 4 is high when the Tset is high, and low when the Tset is low.

  As described above, in the present embodiment, high-temperature water having a predetermined temperature is supplied to the buffer tank and the radiator 4 in the “operation mode A”. In the "operation mode B", the water in the buffer tank is radiated until the temperature of the water passing through the radiator 4 becomes equal to or lower than a predetermined temperature, and is used for heating. In other words, the heat is used until the heat of the high-temperature water is used up.

  According to the hot-water storage type heating device according to the present embodiment, by switching between the two operation modes A and B alternately, hot water (low-temperature water) of a predetermined temperature is used while using the high-temperature water of hot-water storage tank 1. The heating operation returning to 1 becomes possible.

  Thereby, the temperature of the lower part of the hot water storage tank 1 can be maintained at a predetermined temperature or lower, and it is possible to prevent high efficiency water from being reduced in efficiency by boiling high-temperature water when the heat source heat source unit 30 is used for boiling. Become. Therefore, high efficiency of the entire hot water supply / heating system can be achieved. In addition, since the hot water circulating in the radiator 4 is used as heat from the initial temperature (Tset) to the terminal temperature (Tr), the average capacity can be changed by setting the initial and terminal temperatures, and small-capacity heating can be supported. Therefore, it is possible to provide an effective heating device for a low-load heating application such as for a high-insulation and airtight house.

This embodiment will be summarized again with reference to the drawings. Referring to FIG. 1, a heating apparatus 100 according to the present embodiment includes a heat pump heat source unit 30 using a primary refrigerant (eg, CO ₂ ) and a secondary refrigerant heated by heat pump type heat source unit 30 (eg, Hot water storage tank (main tank) 1 for storing water), buffer tank 5 having a smaller capacity than hot water storage tank 1, radiator 4, and secondary refrigerant flowing through hot water storage tank 1, buffer tank 5, and radiator 4 And a flow channel 22 to be made.

  The flow path 22 can form a first closed loop and a second closed loop. The first closed loop introduces the secondary refrigerant in the hot water storage tank 1 into the buffer tank 5 and returns the secondary refrigerant sent from the buffer tank 5 back to the hot water storage tank 1, whereby the secondary refrigerant in the buffer tank 5 is removed. This is a closed loop for replacing the secondary refrigerant inside the hot water storage tank 1. The second closed loop is a closed loop that introduces the secondary refrigerant inside the buffer tank 5 to the radiator 4 and returns the secondary refrigerant cooled by the radiator 4 to the buffer tank 5 without passing through the hot water storage tank 1. .

  Preferably, the first closed loop is configured such that the secondary refrigerant sent from the buffer tank 5 returns to the hot water storage tank 1 via the radiator 4. The heating device 100 is disposed in series with the radiator 4 in the flow path 22, and a pump 14 </ b> A that circulates the secondary refrigerant through the radiator 4, and a secondary refrigerant discharged from the radiator 4 by driving the pump 14 </ b> A. And a flow path switching unit that switches between sending to the buffer tank 5 and sending to the hot water storage tank 1. As the “flow path switching unit”, a three-way valve 3 can be used as shown in FIG.

  By configuring the first closed loop in this way, the secondary refrigerant is circulated also in the radiator 4 when the high-temperature secondary refrigerant is introduced into the buffer tank 5 by the first closed loop. Therefore, heating using the radiator 4 can be continuously performed without interruption.

  Preferably, heating device 100 further includes a control unit 10 that controls channel 22 such that water alternately circulates between the first closed loop and the second closed loop. As a result, as shown in FIG. 6, at times t1 and t3, after the water in the buffer tank 5 drops sufficiently in the second closed loop, the low-temperature water in the buffer tank 5 is stored in the hot water storage tank 1 in the first loop. The efficiency of the heat pump type heat source unit 30 does not need to be reduced even during low-capacity heating.

The alternate switching between the first closed loop and the second closed loop is specifically performed as follows.
As shown in FIG. 5, when the detected temperature (water temperature T) of the temperature sensor 12A decreases to become lower than the first temperature threshold Tr (YES in S2), the control unit 10 changes the operation mode to the operation mode. A is set, and the flow path 22 is switched from the second closed loop to the first closed loop.

  More preferably, when the detected temperature of temperature sensor 12A rises and becomes higher than second temperature threshold value Tset higher than the first temperature threshold value (YES in S4), control unit 10 transmits the first temperature. The flow path 22 is switched from the closed loop to the second closed loop. Alternatively, the control unit 10 switches the flow path 22 from the first closed loop to the second closed loop when a predetermined time has elapsed after switching the flow path 22 from the second closed loop to the first closed loop.

  Preferably, as shown in FIGS. 1 and 3, buffer tank 5 has a first inlet for receiving the secondary refrigerant from hot water storage tank 1 and a second inlet for receiving the secondary refrigerant cooled by radiator 4. And an outlet for sending the secondary refrigerant to the radiator 4. The position of the first inlet is lower than the positions of the outlet and the second inlet of the buffer tank 5.

  In the example of the circulation by the first closed loop in FIG. 3, high-temperature water flows into the lower part of the buffer tank 5 from the first inlet, so that the temperature of the entire buffer tank 5 rises substantially uniformly due to the buoyancy of the water. For this reason, it is possible to raise the water temperature of the buffer tank 5 to an appropriate temperature without abruptly increasing the water supply temperature from the buffer tank 5 to the radiator 4.

[Various modifications]
As the “flow path switching unit” in the flow path 22, a three-way valve 3 can be used as shown in FIG. For example, the portion of the three-way valve 3 may be a simple junction, and the flow paths may be switched by two electromagnetic valves provided in the flow paths 22D and 22E.

  In addition, a pump and piping may be added to the flow path 22, and when a change in the heating temperature is allowed, the radiator 4 may be removed from the first closed loop. For example, if the flow path 22E is connected to the upper outlet of the buffer tank 5 and a pump is added to the flow path 22E, the low-temperature water in the buffer tank 5 can be replaced with the high-temperature water in the hot water storage tank without passing through the radiator 4. It becomes possible. In this case, the three-way valve 3 becomes unnecessary, and the outlet of the pump 14A may be directly connected to the flow path 22D. If the pump added to the flow path 22E is operated intermittently, the water inside the buffer tank 5 can be put into the hot water storage tank 1 after the water temperature is sufficiently lowered as in the configuration of FIG.

  In addition, in the examples illustrated in FIGS. 5 and 6, switching to shift from “operation mode A” to “operation mode B” is determined using Tset as a determination threshold. Alternatively, the switching from the “operation mode A” to the “operation mode B” may be determined based on the elapsed time from when T <Tr is satisfied in step S2 of FIG. For example, the determination in step S4 in FIG. 5 is made as "whether X minutes have passed after the condition of T <Tr in S2 is satisfied". In this case, when the set time X (minutes) is increased, the heating capacity is increased, and when it is decreased, the heating capacity is decreased. The set time X may be adjusted from the remote controller 7 or the like.

  Note that, instead of the above example, when the detected temperature of the temperature sensor 12C provided at the outlet of the buffer tank 5 decreases and becomes lower than the temperature threshold value, the control unit 10 switches from the second closed loop to the first closed loop. The flow path 22 may be switched to a closed loop. In this case, the temperature sensor 12C is used for the determination in step S4 in FIG. 5 instead of the temperature sensor 12A. That is, when the high-temperature water from the upper portion of the hot-water storage tank 1 flows into the buffer tank 5, the high-temperature water is mixed with the low-temperature water in the buffer tank 5, and the temperature of the temperature sensor 12C gradually increases. Therefore, the three-way valve 3 may be switched from the state SA to the state SB when the temperature detected by the temperature sensor 12C reaches a predetermined temperature.

  By performing such control, the upper limit of the temperature flowing into the radiator 4 can be determined. This control is effective when the temperature of the radiator 4 is limited. Further, the heating capacity of the radiator 4 may be adjusted by changing the threshold value for determining the temperature of the temperature sensor 12C.

  Although a fan is not shown in the radiator 4 of FIG. 1, in a configuration having a fan in the radiator 4, control may be performed as follows. For example, for those whose capacity can be adjusted by the fan airflow, the fan airflow is low when the water temperature circulating through the radiator 4 is high, and the fan airflow is high when the water temperature is low. By controlling the air volume of the fan in this way, it is possible to equalize a temporal change in the heating capacity. As a result, it is possible to achieve a comfortable heating with a constant sense of warmth without changing the temperature over time.

  Further, in the above embodiment, the system using the buffer tank 5 has been described. However, when the volume of the radiator 4 is sufficiently large or the pipe length is sufficiently long, a sufficient heat storage medium ( In the case of a configuration that can hold water or brine, or when applied to a heating system that does not raise or lower the temperature, a configuration without the buffer tank 5 may be adopted. In this case as well, by increasing the capacity of the water in the water circuit (first closed loop) including the radiator 4 (large heat capacity), the heat radiation capacity of the radiator 4 can be increased.

  Further, in the above-described embodiment, an example has been described in which the hot water storage tank 1 for storing water is used as a heat storage tank. However, the present invention may be applied to a heating system using brine or the like as a heat storage medium instead of water.

  FIG. 7 is a diagram showing a modification in which the radiator portion is replaced with a radiator circuit including another loop. Referring to FIG. 7, hot water storage type heating apparatus 200 has a configuration in which hot water storage type heating apparatus 100 shown in FIG. In the flow path 222, the radiator 4 is replaced with a radiator circuit 4A. The heat radiation circuit 4A further includes a water heat exchanger 40 and a pump 14C in addition to the heat radiator 4.

  In the configuration of FIG. 1, the radiator 4 is incorporated in both the first and second closed loops. However, in the configuration of FIG. 40 are incorporated.

  By exchanging heat between the high-temperature water from the hot water storage tank 1 and the loop (radiator 4 and pump 14C) on the side of the radiator 4 via the water heat exchanger 40, heat is transferred to the radiator 4. The heating operation in the radiator 4 is performed. In this way, the radiator 4 and the pump 14C are provided as separate loop circuits. As a result, the heat medium on the loop side of the heat radiation circuit 4A can be changed to brine or the like, and liquid freezing in the piping in winter can be prevented.

  The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description of the embodiments, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 2 hot-water supply mixing valve, 3 three-way valve, 4 radiator, 5 buffer tank, 6 mixing tap, 7 remote control, 10 control part, 12A-12D, 13A-13E temperature sensor, 14A, 14B, 14C pump, 20 Hot water storage unit, 22, 22A, 22B, 22C, 22D, 22E, 222 Channel, 30 heat source unit, 40 water heat exchanger, 100, 200 Hot water storage type heating device.

Claims (7)

A heat pump type heat source device using a primary refrigerant,
A first tank for storing a secondary refrigerant heated by the heat pump heat source device,
A radiator,
A second tank having a smaller capacity than the first tank;
A flow path connected to the first tank, the second tank, and the radiator, through which the secondary refrigerant flows;
The flow path has a first closed circuit and a second closed circuit,
The first closed circuit is connected to the first tank, the second tank, and the radiator, and transfers the secondary refrigerant inside the radiator and the second tank to the inside of the first tank. A closed circuit for replacing the secondary refrigerant,
The second closed circuit, the secondary refrigerant in the radiator, not through the first tank, Ri closed circuit der circulating between said second tank,
A temperature sensor provided on the radiator;
A controller configured to switch the flow path from the second closed circuit to the first closed circuit when the temperature detected by the temperature sensor decreases and becomes lower than a first temperature threshold. apparatus.   The heating device according to claim 1, wherein the amount of the secondary refrigerant circulating in the second closed circuit is smaller than the amount of the secondary refrigerant circulating in the first closed circuit. The first closed circuit is configured such that the secondary refrigerant from the second tank flows to the first tank via the radiator.
A pump that is arranged in series with the radiator in the flow path and circulates the secondary refrigerant through the radiator,
3. The apparatus according to claim 2, further comprising: a flow path switching unit configured to switch whether the secondary refrigerant discharged from the radiator by driving the pump flows into the second tank or the first tank. 4. A heating device as described.   4. The control device according to claim 1, further comprising a control unit configured to control the flow path so that the secondary refrigerant circulates alternately between the first closed circuit and the second closed circuit. 5. A heating device as described. The control unit may be configured to determine whether the temperature detected by the temperature sensor has risen and has exceeded a second temperature threshold higher than the first temperature threshold, or in the case where a predetermined time has elapsed since the switching of the flow path, switching the flow path to the second closed circuit from the first closed circuit, the heating device according to claim 1. A heat pump type heat source device using a primary refrigerant,
A first tank for storing a secondary refrigerant heated by the heat pump heat source device,
A radiator,
A second tank having a smaller capacity than the first tank;
A flow path connected to the first tank, the second tank, and the radiator, through which the secondary refrigerant flows;
The flow path has a first closed circuit and a second closed circuit,
The first closed circuit is connected to the first tank, the second tank, and the radiator, and transfers the secondary refrigerant inside the radiator and the second tank to the inside of the first tank. A closed circuit for replacing the secondary refrigerant,
The second closed circuit is a closed circuit that circulates the secondary refrigerant of the radiator with the second tank without passing through the first tank,
A control unit that controls the flow path so that the secondary refrigerant circulates alternately between the first closed circuit and the second closed circuit;
A temperature sensor for detecting a temperature of the secondary refrigerant in the second tank,
A heating unit configured to switch the flow path from the second closed circuit to the first closed circuit when the temperature detected by the temperature sensor decreases and becomes lower than a first temperature threshold value; . A heat pump type heat source device using a primary refrigerant,
A first tank for storing a secondary refrigerant heated by the heat pump heat source device,
A radiator,
A second tank having a smaller capacity than the first tank;
A flow path connected to the first tank, the second tank, and the radiator, through which the secondary refrigerant flows;
The flow path has a first closed circuit and a second closed circuit,
The first closed circuit is connected to the first tank, the second tank, and the radiator, and transfers the secondary refrigerant inside the radiator and the second tank to the inside of the first tank. A closed circuit for replacing the secondary refrigerant,
The second closed circuit is a closed circuit that circulates the secondary refrigerant of the radiator with the second tank without passing through the first tank,
The second tank is
A first inlet for receiving the secondary refrigerant from the first tank;
A second inlet for receiving the secondary refrigerant cooled by the radiator;
An outlet for sending the secondary refrigerant to the radiator,
It said first inlet position is lower than the position of the outlet and the second inlet, heating system.

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