JP2012013346A - Hot-water heating water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-water heater and water heater for improving the efficiency of energy utilization.SOLUTION: The hot-water heater and water heater 10 includes: a heat source device 1; a circulator 54; a hot water storage tank 55; a first heat exchanger 56a for heating the hot water in the upper part of the hot water storage tank 55 by using the heated fluid by the heat source device 1; and a second heat exchanger 56b for heating the hot water in the lower part of the hot water storage tank 55 by using the heated fluid by the heat source device 1. The hot-water heater and water heater is configured to circulate fluid in both the first heat exchanger 56a and the second heat exchanger 56b if the heat storage rate of the hot water storage tank 55 is less than a predetermined value, and on the other hand, circulate fluid in the first heat exchanger 56a if the heat storage rate of the hot water storage tank 55 exceeds the predetermined value.

Description

  The present invention relates to a hot water heating and hot water supply apparatus that performs a heating operation and a heat storage operation using a high-temperature fluid generated by a heat source device.

  Conventionally, water is heated with a heat source device to generate a high-temperature fluid, and the high-temperature fluid is used to store heat in a hot water storage tank, or the high-temperature fluid is used to perform heating operation. Hot water heating and hot water supply devices are known.

  For example, Patent Document 1 discloses that heating and hot water supply are performed using a hot water heating and hot water supply apparatus 100 as shown in FIG. The hot water heating and hot water supply apparatus 100 is configured such that a heat source apparatus 110, a first circulation means 120 for circulating a fluid, and a hot water storage tank 140 are connected to a fluid circuit 150 and arranged in an annular shape.

  Inside the hot water storage tank 140, a heat exchanger 130 is provided from the upper region to the lower region of the hot water storage tank 140. The heat exchanger 130 has a first connection port 131a at the top and a second connection port 131b at the bottom.

  In addition, a radiator 300 is connected to the fluid circuit 150 in parallel with the heat source device 110 as viewed from the heat exchanger 130. The heat exchanger 130 is configured to circulate the fluid by the second circulation means 310.

  In the case of the heat storage operation, the first on-off valve 200 and the second on-off valve 210 are set in the open state, and the third on-off valve 220 and the fourth on-off valve 230 are set in the closed state.

  The high-temperature fluid generated by the heat source device 110 flows out of the heat source device 110 and flows into the heat exchanger 130 disposed inside the hot water storage tank 140 through the fluid circuit 150. The fluid flowing in from the first connection port 131a at the top of the heat exchanger 130 heats the water in the hot water storage tank 140. The fluid that has been radiated and cooled by the heat exchanger 130 flows out of the second connection port 131b at the bottom of the heat exchanger 130, and flows into the heat source device 110 through the first circulation means 120.

  Hot water heated in the hot water storage tank 140 is used for hot water supply or the like.

  In the heating operation, the first on-off valve 200 and the second on-off valve 210 are set in a closed state, and the third on-off valve 220 and the fourth on-off valve 230 are set in an open state.

  The fluid that has flowed out of the first connection port 131 a at the upper part of the hot water storage tank 140 is conveyed to the radiator 300. The fluid cooled by radiating the warm heat held by the radiator 300 flows into the second connection port 131 b at the lower part of the hot water storage tank 140 through the second circulation means 310. Thereby, the heating operation in which the periphery of the radiator 300 is heated can be performed.

  In this way, when a heat load of heating or hot water supply is generated by heating the fluid with the heat source device 110 to generate a high-temperature fluid and operating the on-off valve of the fluid circuit 150 to store heat in the hot water storage tank 140. The hot heat stored in the hot water storage tank 140 can be used for heating and hot water supply.

International Publication No. 2009/009368

  However, in the conventional configuration, during the heat storage operation, when the high-temperature fluid generated by the heat source device 110 flows into the first connection port 131a, the high-temperature fluid radiates heat in the range from the upper region to the lower region of the hot water storage tank 140, The entire amount of water in the hot water storage tank 140 is heated and flows out from the second connection port 131b.

  That is, when high-temperature hot water such as hot water is required, the entire amount of water in the hot water storage tank 140 is boiled to a high temperature.

  At this time, for example, when the thermal load such as hot water supply is small and the amount of hot water stored in the hot water storage tank 140 is small, the hot water storage tank 140 stores excessive heat compared to the thermal load, and unnecessary energy is stored. From the aspect of using, there has been a problem that the efficiency of energy use has not been achieved.

  The present invention solves the above-mentioned conventional problems, and provides a hot water heating and hot water supply apparatus that can improve the efficiency of energy utilization by changing the heat storage area of the hot water storage tank according to the heat load of the hot water storage tank. With the goal.

  In order to solve the above-described conventional problems, a hot water heating and hot water supply apparatus of the present invention includes a heat source device, circulation means for circulating a fluid heated by the heat source device (heating fluid), a hot water storage tank for storing hot water, and a hot water storage tank. The first heat exchanger that heats the hot water in the upper part of the hot water with the heating fluid, the second heat exchanger that heats the hot water in the lower part of the hot water storage tank with the heating fluid, the first heat exchanger and the second heat exchange It is set as the structure provided with the flow-path switching means which circulates a fluid to both or one of the vessels.

  Thereby, the fluid can be circulated through both the first heat exchanger and the second heat exchanger or either one according to the heat load.

  The hot water heating and hot water supply apparatus of the present invention can select whether hot water is stored in the entire hot water storage tank or only about half of the hot water storage tank depending on the heat load, and therefore performs heat storage according to the heat load. It is possible to improve the efficiency of energy use.

Schematic explanatory drawing of the fluid circuit (heat storage operation at high load) of the hot water heating and hot water supply apparatus in Embodiment 1 of the present invention Schematic explanatory drawing of the fluid circuit (heat storage operation at low load) of the hot water heating and hot water supply apparatus in Embodiment 1 of the present invention Schematic explanatory drawing of the fluid circuit (heating operation at high load) of the hot water heating hot water supply apparatus in Embodiment 2 of the present invention Schematic explanatory drawing of the fluid circuit (heating operation at low load) of the hot water heating and hot water supply apparatus in Embodiment 2 of the present invention Schematic configuration diagram of a conventional hot water heating and hot water supply device

1st invention heats the fluid, the circulating means which circulates the fluid heated with the heat source device, the hot water storage tank which stores warm water, and 1st which heats the warm water of the upper part of a hot water tank with a fluid The fluid is circulated in the heat exchanger, the second heat exchanger that heats the hot water in the lower part of the hot water storage tank with the fluid, and / or the first heat exchanger and / or the second heat exchanger. A flow path switching means.

  As a result, depending on the heat load, the fluid can be selected to be conveyed to both or either of the first heat exchanger and the second heat exchanger. For this reason, the efficiency of energy utilization can be improved by performing heat storage according to the heat load.

  According to a second aspect of the present invention, in particular, in the hot water heating apparatus of the first aspect, when the amount of heat stored in the hot water storage tank is equal to or less than a predetermined value, both the first heat exchanger and the second heat exchanger have a heating fluid. When the amount of heat stored in the hot water storage tank exceeds a predetermined value, the fluid is circulated through the first heat exchanger.

  As a result, during the heat storage operation, if the amount of heat stored in the hot water storage tank is less than the predetermined value, the entire hot water storage tank can store heat, and if the amount of stored heat in the hot water storage tank exceeds the predetermined value, it is approximately the upper half of the hot water storage tank. Only hot water can be heated, and heat can be stored intensively only in the upper half of the hot water storage tank. For this reason, the efficiency of energy utilization can be improved by performing heat storage according to the heat load of the hot water storage tank.

  3rd invention is equipped with the heat radiator which thermally radiates the heat | fever of the fluid especially in the hot water heating apparatus in 1st invention, and when the heat dissipation of a heat radiator exceeds predetermined value, 1st of a hot water storage tank The fluid is circulated through both the heat exchanger and the second heat exchanger, and when the heat radiation amount of the radiator is a predetermined value or less, the fluid is circulated through the first heat exchanger.

  As a result, during the heating operation, if the heat dissipation amount of the radiator used for heating exceeds a predetermined value, heat is absorbed from the entire hot water storage tank, and if the heat dissipation amount of the radiator is less than the predetermined value, Only half of the hot water absorbs heat, and the heat absorbed is dissipated by a radiator. For this reason, depending on the load of the radiator used for heating, the area of high-temperature hot water stored in the hot water storage tank is changed between the whole and approximately the upper half, and the energy usage efficiency is improved by using the amount of heat stored. Can be improved.

  In the fourth invention, in particular, in the third invention, when the heat storage amount of the hot water storage tank is equal to or less than a predetermined value, even if the heat dissipation amount of the radiator exceeds a predetermined value, the first heat exchanger The fluid is circulated.

  As a result, only the first heat exchanger capable of effectively exchanging heat when the amount of heat stored in the hot water storage tank is small even when the heat dissipation amount of the radiator used for heating is less than a predetermined value during heating operation. Since the heat can be absorbed, the efficiency of energy utilization can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
In FIG. 1, the hot water heating hot-water supply apparatus 10 which concerns on the 1st Embodiment of this invention is shown.

  The hot water heating and hot water supply apparatus 10 includes a heat source apparatus 1 that is a refrigeration cycle apparatus, a fluid circuit 5, and a hot water storage tank 55.

The heat source device 1 includes a refrigerant circuit 2 that circulates a refrigerant. As the refrigerant, for example, R
A pseudo-azeotropic refrigerant mixture such as 410A or a single refrigerant such as R32 can be used.

  The refrigerant circuit 2 is configured by connecting a compressor 21, a refrigerant fluid heat exchanger 22, an expansion means 23 such as an expansion valve and a cavillary tube, and an evaporator 24 in a ring shape by piping. In the present embodiment, an accumulator 25 that performs gas-liquid separation is provided between the evaporator 24 and the compressor 21. Further, the refrigerant circuit 2 has a four-way valve for switching between a heat storage operation in which the fluid is heated by the refrigerant fluid heat exchanger 22 and heat is stored in the hot water storage tank 55 and a defrost operation in which frost adhering to the evaporator 24 is melted. 3 is provided.

  In the heat storage operation, the refrigerant discharged from the compressor 21 is sent to the refrigerant fluid heat exchanger 22 via the four-way valve 3.

  In the present embodiment, the heat source device 1 constitutes a high-temperature fluid generating device that uses the fluid generated by the heat storage operation to store heat in the hot water storage tank 55, and the refrigerant fluid heat exchanger 22 includes the high-temperature refrigerant and the low-temperature fluid. It is a heat exchanger for heating the fluid by exchanging heat with (for example, water or antifreeze).

  The fluid circuit 5 includes a supply pipe 51 that supplies fluid flowing out from the refrigerant fluid heat exchanger 22 to the hot water storage tank 55 and the like, a recovery pipe 52 that recovers fluid flowing out from the hot water storage tank 55 and the like to the refrigerant fluid heat exchanger 22, and supply A radiator 53 that heats the surrounding air or floor with a fluid supplied from a pipe 51 and a circulation means 54 such as a pump that circulates the fluid are provided.

  The fluid circuit 5 includes a bypass circuit 56 that bypasses the radiator 53 and a flow rate adjusting unit 61 d that is a valve that adjusts the flow rate of the fluid flowing through the bypass circuit 56. As the flow rate adjusting means 61d, in addition to the flow rate adjusting valve, a two-way valve or an electromagnetic on-off valve can be used.

  In the hot water storage tank 55, a first heat exchanger 56 a is installed in the upper half of the hot water storage tank 55, and a second heat exchanger 56 b is installed in the lower half of the hot water storage tank 55. The first heat exchanger 56a is connected to the supply pipe 51 via the first flow path switching means 61a and the second flow path switching means 61b. The second heat exchanger 56b is connected to the supply pipe 51 via the first heat exchanger 56a or the second flow path switching means 61b and the third flow path switching means 61c.

  The first flow path switching means 61a is a three-way valve that supplies the fluid from the supply pipe 51 to either the radiator 53 or the second flow path switching means 61b. The second flow path switching means 61b is a three-way valve that supplies the fluid from the first flow path switching means 61a to one of the first heat exchanger 56a and the third flow path switching means 61c. The third flow path switching means 61c is a three-way valve that supplies the fluid from the second flow path switching means 61b or the first heat exchanger 56a to either the second heat exchanger 56b or the supply pipe 51. is there. In the present embodiment, the second flow path switching means 61b and the third flow path switching means 61c constitute the flow path switching means of the present invention.

  Further, the supply pipe 51, the recovery pipe 52, and the hot water storage tank 55 are provided with a first temperature detection means 71, a second temperature detection means 72, and a third temperature detection means 73, respectively. The third temperature detection means 73 is preferably disposed between the first heat exchanger 56a and the second heat exchanger 56b.

  About the hot water heating hot-water supply apparatus comprised as mentioned above, the case where a thermal storage driving | operation is performed is demonstrated below.

First, in the refrigerant circuit 2, the high-pressure gas refrigerant discharged from the compressor 21 flows into the refrigerant fluid heat exchanger 22, dissipates the heat of condensation, and passes through the fluid flow path of the refrigerant fluid heat exchanger 22. Heat the fluid to heat the fluid.

  On the other hand, the high-pressure liquid refrigerant that has flowed out of the refrigerant fluid heat exchanger 22 is decompressed by the expansion means 23 and expanded, and then flows into the evaporator 24. The low-pressure two-phase refrigerant that has flowed into the evaporator 24 evaporates and absorbs heat of vaporization from the air, and flows out of the evaporator 24 as a low-pressure two-phase refrigerant or superheated refrigerant.

  The low-pressure refrigerant that has flowed out of the evaporator 24 passes through the four-way valve 3 and undergoes gas-liquid separation by the accumulator 25, and then the gas-phase refrigerant is sucked into the compressor 21.

  On the other hand, in the fluid circuit 5, the fluid discharged from the circulation means 54 is heated by exchanging heat with the refrigerant condensed in the refrigerant flow path of the refrigerant fluid heat exchanger 22 in the refrigerant fluid heat exchanger 22 to become a high temperature fluid. .

  First, a description will be given of a high load in which the amount of heat stored in the hot water storage tank 55 is a predetermined value or less. In FIG. 1, the flow direction of the refrigerant and the flow direction of the water are indicated by arrows. In this case, the control unit (not shown) switches the first flow path switching unit 61a so that the supply pipe 51 and the second flow path switching unit 61b communicate with each other. The second flow path switching means 61b is switched so that the first flow path switching means 61a and the first heat exchanger 56a communicate with each other. The third flow path switching unit 61c is switched so that the first heat exchanger 56a and the second heat exchanger 56b communicate with each other. The flow rate adjusting means 61d is set to a closed state when the fluid hardly flows, for example, when the flow rate adjusting means 61d is an electromagnetic on-off valve.

  The high-temperature fluid generated in the refrigerant fluid heat exchanger 22 flows into the first heat exchanger 56a provided in the upper part of the hot water storage tank 55 through the first flow path switching means 61a and the second flow path switching means 61b. To do. Then, the heat is radiated to the hot water of substantially the upper half of the hot water storage tank 55 through the first heat exchanger 56a.

  Thereafter, the hot water generated by the refrigerant fluid heat exchanger 22 dissipates heat through the second heat exchanger 56b installed in the lower part of the hot water storage tank 55 via the third flow path switching means 61c, and the hot water storage tank. The warm water in the lower half of 55 is heated.

  At this time, since the first heat exchanger 56 a and the second heat exchanger 56 b heat the hot water in the hot water storage tank 55, the hot hot water is stored in the entire hot water storage tank 55.

  The fluid heated in the hot water storage tank 55 through the first heat exchanger 56a and the second heat exchanger 56b joins the supply pipe 51 (point a in FIG. 1). Then, the flow rate adjusting means 61 d whose flow path is set to the open state flows into the bypass circuit 56 and is conveyed to the refrigerant fluid heat exchanger 22 via the circulation means 54.

  Next, the case of a low load in which the amount of heat stored in the hot water storage tank 55 exceeds a predetermined value will be described with reference to FIG.

  In this case, the first flow path switching means 61a is switched by the control device so that the supply pipe 51 and the second flow path switching means 61b communicate with each other. The second flow path switching means 61b is switched so that the first flow path switching means 61a and the first heat exchanger 56a communicate with each other. The third flow path switching means 61c is switched so that the first heat exchanger 56a and the supply pipe 51 communicate with each other.

The hot water generated by the refrigerant fluid heat exchanger 22 of the hot water heating and hot water supply apparatus 10 flows into the hot water storage tank 55 through the first flow path switching means 61a and the second flow path switching means 61b, and is installed in the hot water storage tank 55. Heat is radiated through the first heat exchanger 56a.

  At this time, since the first heat exchanger 56 a heats the hot water in the upper part of the hot water storage tank 55, the hot hot water is stored only in the upper part of the hot water storage tank 55.

  The hot water heated in the hot water storage tank 55 joins the supply pipe 51 (point a in FIG. 2) via the third flow path switching means 61c without passing through the second heat exchanger 56b. Then, the flow rate adjusting means 61 d whose flow path is set to the open state flows into the bypass circuit 56 and is conveyed to the refrigerant fluid heat exchanger 22 via the circulation means 54.

  As the predetermined value of the heat storage amount of the hot water storage tank 55, for example, the heat storage amount of the hot water storage tank when the proportion of high-temperature hot water in the entire hot water storage tank 55 is approximately half can be employed. More specifically, when the third temperature detection means 73 is lower than a predetermined value (for example, 30 ° C.) stored in the memory of the control device, the heat storage amount of the hot water storage tank 55 is not more than a predetermined value. judge. On the other hand, when the 3rd temperature detection means 73 exceeds a predetermined value, it determines with the heat storage amount of the hot water storage tank 55 exceeding the predetermined value.

  The hot water supply load is covered by using the amount of heat stored in the stored hot water. That is, the hot water stored in the entire hot water storage tank 55 is supplied to a kitchen faucet, a bathroom shower, or the like and used for hot water supply.

  As described above, in the present embodiment, it is possible to select whether to store heat in the entire hot water storage tank 55 or to store heat in a part of the hot water storage tank 55 according to the heat load. Therefore, the efficiency of energy use can be improved.

  In the present embodiment, when the heat load is high, the heating fluid is allowed to flow only in the first heat exchanger 56a and heat is stored only in the upper part of the hot water storage tank 55. However, the second heat The switching means may be switched so that the heating fluid flows only in the exchanger 56b, and heat may be stored only in the lower part of the hot water storage tank 55. However, considering that the hot water moves to the upper side by natural convection in the hot water storage tank 55, heat can be stored more efficiently by storing heat only on the upper side as in this embodiment.

  In particular, in the present embodiment, until the heat storage operation is performed, for example, when the hot water supply load or heating load up to the previous day is high and the heat storage amount of the hot water storage tank 55 is reduced, the flow path through which the heating fluid flows is switched. Thus, the heating fluid is circulated through both the first heat exchanger 56a and the second heat exchanger 56b of the hot water storage tank 55 to dissipate the heat, and the hot water in the hot water storage tank 55 is heated to store the entire hot water storage tank 55. Can do.

  On the other hand, when the hot water supply load or the heating load is low and the amount of heat stored in the hot water storage tank 55 is not reduced, the heating fluid from the heat source device 1 is controlled only by the first heat exchanger 56a by controlling the flow path switching means. By circulating the hot water, the hot water can be concentrated in the upper half region of the hot water storage tank 55 in a concentrated manner.

  According to this, since it is possible to easily determine whether the heat load is high or low, the energy use efficiency can be improved.

In FIG. 1, the first flow path switching means 61a, the second flow path switching means 61b, and the third flow path switching means 61c are all switched by one switching means, but at least any one of them is switched. The flow path may be switched by using a plurality of flow rate adjusting means as the flow path switching means. Further, as in the present embodiment, the case where the fluid is allowed to flow through both the first heat exchanger 56a and the second heat exchanger 56b and the case where the fluid is allowed to flow only through the first heat exchanger 56a are switched. If so, the first flow path switching means and the second flow path switching means can be omitted.

  Further, as a method of determining the amount of heat stored in the hot water storage tank 55, the detection value of the third temperature detection means 73 is used, but the present invention is not limited to this, and a plurality of temperature detection means are provided in the vertical direction of the hot water storage tank 55. It is also possible to determine the amount of heat stored in the hot water storage tank 55 from these detected values. In this case, since the amount of heat stored in the hot water storage tank 55 can be determined more finely, switching of the flow path switching means can be performed more efficiently.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIG. Hereinafter, the case where a heating operation is performed is demonstrated about the hot water heating hot-water supply apparatus comprised like 1st Embodiment. During the heating operation, the heat source device 1 is stopped, the refrigerant is not circulating in the refrigerant circuit 2, and the flow rate adjusting means 61d in the fluid circuit 5 is set to the closed state. This is different from the heat storage operation explained in.

  First, the case of a high load where the heat dissipation amount of the radiator 53 exceeds a predetermined value will be described. In FIG. 3, the direction of water flow is indicated by arrows. The first flow path switching means 61a is switched by the control device so that the supply pipe 51 and the second flow path switching means 61b communicate with each other. The second flow path switching means 61b is switched so that the first flow path switching means 61a and the first heat exchanger 56a communicate with each other. The third flow path switching unit 61c is switched so that the first heat exchanger 56a and the second heat exchanger 56b communicate with each other.

  The fluid flowing out from the refrigerant fluid heat exchanger 22 circulates through the first heat exchanger 56a provided in the upper part of the hot water storage tank 55 through the first flow path switching means 61a and the second flow path switching means 61b. It circulates through the 2nd heat exchanger 56b installed in the lower part of the hot water storage tank 55 via the 3 flow-path switching means 61c, and absorbs heat from the hot water storage tank 55 whole.

  Thereafter, the hot water absorbed from the hot water storage tank 55 joins the supply pipe 51 (point a in FIG. 3). Then, the flow rate adjusting means 61d in which the flow path is set to the closed state does not flow into the bypass circuit 56 but is conveyed to the radiator 53. Then, the heat is dissipated by the radiator 53 and heated, and is conveyed to the refrigerant fluid heat exchanger 22 via the circulation means 54.

  Next, the case where the heat radiation amount of the radiator 53 is a low load with a predetermined value or less will be described with reference to FIG.

  In this case, the first flow path switching means 61a is switched by the control device so that the supply pipe 51 and the second flow path switching means 61b communicate with each other. The second flow path switching means 61b is switched so that the first flow path switching means 61a and the first heat exchanger 56a communicate with each other. The third flow path switching means 61c is switched so that the first heat exchanger 56a and the supply pipe 51 communicate with each other.

  The heated fluid that has flowed out of the refrigerant fluid heat exchanger 22 of the hot water heating and hot water supply apparatus 10 is provided in the upper part of the hot water storage tank 55 through the first flow path switching means 61a and the second flow path switching means 61b. Circulates in the vessel 56a, absorbs heat from the hot water storage tank 55, passes through the third flow path switching means 61c, and merges with the supply pipe 51 (point a in FIG. 4) without passing through the second heat exchanger 56b.

Thereafter, the flow rate adjusting means 61 d whose flow path is set to the closed state does not flow into the bypass circuit 56 and is conveyed to the radiator 53. Then, the radiator 53 radiates heat and performs heating, and is conveyed to the refrigerant fluid heat exchanger 22 via the circulation means 54.

  More specifically, as a method of determining whether or not the heat dissipation amount of the radiator 53 exceeds a predetermined value, the second temperature detecting means 72 is stored in a predetermined value (for example, 30) stored in the memory of the control device or the like. When the second temperature detection means 72 is lower than the predetermined value, the heat dissipation amount of the radiator 53 is predetermined. It is determined that the value of is exceeded.

  In this embodiment, since the heat source device 1 is stopped and the refrigerant is not circulating in the refrigerant circuit 2, the detection value of the first temperature detection means 71 is used instead of the detection value of the second temperature detection means 72. However, the same effect can be obtained. However, since the heating operation can also be performed when the heat source device 1 is operated, in order to determine whether or not the heat dissipation amount in the radiator 53 exceeds a predetermined value more accurately, the second operation is performed. It is preferable to use the detection value of the temperature detection means 72. Further, it can be determined more accurately if the circulation amount of the fluid flowing through the radiator 53 is taken into consideration in order to determine whether or not the heat dissipation amount in the radiator 53 exceeds a predetermined value.

  As described above, in the present embodiment, when the heat load of the radiator 53 used for heating, that is, a high load where the heat dissipation amount in the radiator 53 exceeds a predetermined value, the hot water storage tank is switched by switching the flow path. The fluid is circulated through both the first heat exchanger 56a and the second heat exchanger 56b, and the heat stored in the entire hot water storage tank 55 is used for heating.

  On the other hand, when the heat load of the radiator 53 used for heating, that is, when the amount of heat released by the radiator 53 is a low load equal to or less than a predetermined value, the flow path switching means is controlled and the fluid is supplied only to the first heat exchanger 56a. Is circulated so that heat is absorbed only from the first heat exchanger 56 a of the hot water storage tank 55, that is, only hot water stored in the substantially upper half of the hot water storage tank, and is used for heating by the radiator 53.

  In other words, according to the load of the radiator 53 used for heating, the area of high-temperature hot water stored in the hot water storage tank 55 is changed between the whole and substantially the upper half, and the energy usage efficiency is obtained by using the stored heat quantity. Can be improved.

(Embodiment 3)
Regarding the hot water heating and hot water supply apparatus configured in the same manner as in the first embodiment, the heat storage amount of the hot water storage tank 55 is predetermined when performing a high load heating operation in which the heat dissipation amount of the radiator 53 exceeds a predetermined value. A case where the value is equal to or less than the value of will be described.

  When performing a heating operation with a high load in which the heat dissipation amount of the radiator 53 exceeds a predetermined value, as described in the second embodiment, the fluid flowing through the radiator 53 is changed by the flow path switching unit. The heat is circulated through the first heat exchanger 56 a and the second heat exchanger 56 b to absorb heat from the entire hot water storage tank 55.

  However, when the amount of heat stored in the hot water storage tank 55 is equal to or less than a predetermined value, that is, when the third temperature detecting means 73 is lower than a predetermined value (for example, 30 ° C.) stored in the memory of the control device, etc. Only one heat exchanger 56 a circulates fluid and absorbs heat only from the upper part of the hot water storage tank 55.

  That is, even when a high load heating operation in which the heat dissipation amount of the radiator 53 exceeds a predetermined value is performed, if the temperature at the lower part of the hot water storage tank 55 is lowered, the heat is absorbed from the second heat exchanger 56b. There is nothing.

According to this, since the temperature of the surrounding hot water is lowered and the fluid is not allowed to flow through the second heat exchanger 56b having little room for heat exchange, the efficiency of energy utilization can be further improved.

  As described above, the hot water heating and hot water supply apparatus according to the present invention switches the flow path according to the magnitude of the thermal load of the hot water storage tank, changes the region of the hot water stored in the hot water storage tank to the entire upper half and the hot water storage hot water storage tank. By using and storing heat according to the heat load of the tank, it is possible to improve the efficiency of energy use. Heating water to generate hot water by heating water and using that hot water for heating and hot water, etc. It can be applied to other uses.

DESCRIPTION OF SYMBOLS 1 Heat source apparatus 2 Refrigerant circuit 5 Fluid circuit 10 Hot water heating hot-water supply apparatus 21 Compressor 22 Refrigerant fluid heat exchanger 23 Expansion means 24 Evaporator 54 Circulation means 55 Hot water storage tank 56a 1st heat exchanger 56b 2nd heat exchanger 61a First flow path switching means 61b Second flow path switching means 61c Third flow path switching means 61d Flow rate adjusting means

Claims (4)

Heat source device for heating fluid, circulating means for circulating fluid heated by the heat source device, a hot water storage tank for storing hot water, and a first heat exchanger for heating hot water in the upper part of the hot water storage tank with the fluid And the second heat exchanger that heats the hot water in the lower part of the hot water storage tank with the fluid, the first heat exchanger and the second heat exchanger, or the fluid in either one of them. A hot water heating and hot water supply apparatus comprising a flow path switching means for circulation. When the heat storage amount of the hot water storage tank is less than or equal to a predetermined value, the fluid is circulated through both the first heat exchanger and the second heat exchanger, and the heat storage amount of the hot water storage tank exceeds a predetermined value The hot water heating and hot water supply apparatus according to claim 1, wherein the fluid is circulated through the first heat exchanger when the heating is performed. A radiator that dissipates heat of the fluid, and when the heat dissipation amount of the radiator exceeds a predetermined value, the fluid is circulated through both the first heat exchanger and the second heat exchanger. 2. The hot water heating and hot water supply apparatus according to claim 1, wherein the fluid is circulated through the first heat exchanger when a heat radiation amount of the radiator is equal to or less than a predetermined value. When the heat storage amount of the hot water storage tank is less than or equal to a predetermined value, the fluid is circulated through the first heat exchanger even when the heat dissipation amount of the radiator exceeds a predetermined value. Item 4. The hot water heating and hot water supply apparatus according to item 3.