JP2010175150A - Hot water supply heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform hot water supply and heating, and to suppress running-out of hot water, in a hybrid type hot water supply heating device including a heat pump and a combustor as heat sources. <P>SOLUTION: A flow channel of warm water from a heating mechanism can be switched to either of a first heating warm water return path side for returning the warm water to a hot water storage tank and a second heating warm water return path side for supplying the warm water to a hot water supply warm water path by switching a switch valve. When the hot water supply and the heating are simultaneously performed, the switch valve is moved to the second heating warm water return path side, to supply the warm water from the heating mechanism to the hot water supply warm water path and distribute the same to a hot water supplying mechanism, thus heat energy of the warm water from the heating mechanism can be utilized in hot water supply. As the water of intermediate temperature can be prevented from returning to a hot water storage tank, and a temperature of the water at a lower section of the hot water storage tank can be kept low, the efficiency of the heat pump heating the water at the lower section of the hot water storage tank can be improved. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hybrid hot water supply / room heating device including a heat pump and a combustor as a heat source.

  The hybrid hot water supply / room heating device includes a heat pump and a combustor as heat sources, and performs low-cost operation by appropriately using the heat sources. In the hybrid hot water supply apparatus, a heat pump is mainly used as a heat source, and water heated by the heat pump is stored in a hot water storage tank and used as necessary. Hot water is stored mainly by using a heat pump, which is a low-cost heat source, and when hot water in the hot water storage tank runs out or heat is insufficient due to the heat pump, a combustor is used as an auxiliary heating source. Secure. Hot water supply heating can be carried out stably even in the case of a large heating load where the capacity of the heat pump is insufficient or in a cold region.

  In the hybrid hot water supply and heating apparatus, the heating operation is performed by circulating heating water or the like as a heat medium in a heating mechanism provided with a heating terminal and heating directly or indirectly by a heat source. The heated water for heating circulates through the heating mechanism to dissipate heat and is heated again by the heat source. In order to perform highly efficient heating operation using a heat pump as a heat source, the temperature of the heating water returning from the heating mechanism needs to be sufficiently low. When the heating water returning from the heating mechanism is so-called medium-temperature water, the efficiency of the heat pump is lowered and low-cost operation cannot be performed.

  In patent document 1, in the heat pump hot water supply and heating device using only the heat pump as a heat source, a plurality of hot water inlets are installed in the height direction of the hot water storage tank. During the heating operation, the hot water in the hot water storage tank is taken out, the heating water circulating in the floor heating unit is heated, and returned to the hot water storage tank again. The hot water returned to the hot water storage tank is introduced by selecting a hot water inlet provided in a region where water in the hot water storage tank having the same temperature as the hot water temperature returned to the hot water storage tank exists. This maintains the temperature stratification formed in the hot water storage tank, and prevents the temperature of the water in the lower part of the hot water tank from becoming higher by mixing the temperature of the medium temperature water returned to the hot water tank and the temperature of the water in the lower part of the hot water tank. ing. Furthermore, a hot water outlet is installed at the center in the height direction of the hot water storage tank, which is an intermediate hot water region, and the hot water is discharged according to the required temperature of hot water supply and used as hot water supply water.

Japanese Patent Laid-Open No. 2003-114053

  However, since a hybrid hot-water supply and heating device is usually used when the heating load is large, the amount of medium-temperature water generated by heating is larger than that of a hot-water supply and heating device using only a heat pump as a heat source. Since a large amount of intermediate temperature water is returned to the hot water storage tank, as in Patent Document 1, once the intermediate temperature water is flowed into the hot water storage tank and then used for hot water supply, even if temperature stratification is maintained, the intermediate temperature water area remains in the hot water storage tank. The temperature of the water in the lower part of the hot water tank cannot be maintained sufficiently low. In the hot water supply and heating device, when hot water is supplied at the same time as heating, the load is particularly large and the capacity of the heat pump is likely to be insufficient, so the proportion of using the combustor as an auxiliary heat source increases.

  Accordingly, the present invention provides a heat pump, a hot water storage tank that stores hot water heated by the heat pump, a hot water supply mechanism that supplies hot water using hot water in the hot water storage tank, a heating mechanism that heats using hot water in the hot water storage tank, and a heating mechanism A hot water supply and heating device including a combustor provided in a hot water supply and hot water path for sending hot water from a hot water storage tank to a hot water supply mechanism, a heating and hot water going path for sending hot water from the hot water storage tank to the heating mechanism, and hot water from the heating mechanism for hot water storage A first heating hot water return path to be returned to the tank, a second heating hot water return path for supplying hot water from the heating mechanism to the upstream side of the hot water supply mechanism of the hot water supply hot water path, and a destination of the hot water from the heating mechanism for the first heating return path and the second A hot water supply and heating device including a switching valve that switches to one of the heating return paths is provided.

  According to the present invention, the flow path of the hot water from the heating mechanism is switched to either the first heating return path side returning to the hot water storage tank or the second heating return path side supplying to the hot water supply hot water path by switching the switching valve. be able to. By supplying hot water from the heating mechanism to the hot water supply hot water path and sending it to the hot water supply mechanism, the thermal energy of the hot water from the heating mechanism can be used for hot water supply. As a result, the medium temperature water can be prevented from returning to the hot water storage tank, and the temperature of the water in the lower part of the hot water storage tank can be kept low. Therefore, the efficiency of the heat pump for heating the water in the lower part of the hot water storage tank can be improved.

  In the present invention, when hot water supply and heating are performed simultaneously, the hot water from the heating mechanism can be used for hot water supply by switching the destination of the hot water from the heating mechanism to the second heating hot water return path.

  In the present invention, when the temperature of the hot water in the hot water storage tank is less than the predetermined temperature, the destination of the hot water from the heating mechanism is switched to the first heating / hot water return path even when hot water supply and heating are performed simultaneously. It can also be. While ensuring hot water supply temperature and heating temperature, hot water can be prevented from running out and operation can be carried out stably.

  In a hot water supply and heating apparatus that stores hot water supply water that can be used for a hot water supply mechanism in a hot water storage tank, the heating mechanism includes a heat exchanger that exchanges heat between the heat medium circulating in the heating mechanism and the hot water in the hot water storage tank. The heating hot water outbound route sends hot water from the hot water storage tank to the heat exchanger. The first heating hot water return path returns the hot water from the heat exchanger to the hot water storage tank, and the second heating hot water return path supplies the hot water from the heat exchanger upstream from the hot water supply mechanism of the hot water supply hot water path. The hot water supply mechanism mixes hot water and clean water from the hot water supply hot water path and supplies them to the hot water supply terminal.

  To store hot water in the hot water storage tank, send the hot water from the hot water storage tank to the heating mechanism, and heat the heat transfer medium through the heat exchanger, supply the hot water after heating directly from the hot water supply terminal as hot water supply water Can do. The amount of hot water that has been used for heating is equivalent to the amount of hot water supplied, so that hot water that is low-temperature water can be supplied to the hot water storage tank, and the temperature of the water below the hot water storage tank can be kept lower.

  ADVANTAGE OF THE INVENTION According to this invention, when performing hot water supply and heating simultaneously with the hot water supply and heating apparatus provided with the heat pump and the combustor as a heat source, the efficiency of a heat pump can be improved. Even during the simultaneous operation of heating and hot water supply, which is a high load operation, the heat pump, which is a low-cost heat source, can be used effectively as a heat source, so that low-cost operation can be performed.

The figure explaining the hot-water supply heating apparatus of an Example. The flowchart explaining the hot water supply heating operation of an Example. The flowchart explaining the hot water supply heating operation of an Example. The flowchart explaining the hot water supply heating operation of an Example. The flowchart explaining the hot water supply heating operation of an Example. The figure explaining the hot-water supply heating apparatus of an Example.

The main features of the embodiments described below are listed below.
(Feature 1) The heating mechanism includes a high temperature heating terminal and a low temperature heating terminal.
The refrigerant used in the (feature 2) heat pump unit is CO _2.
(Characteristic 3) The heat medium circulating in the heating mechanism is water or antifreeze.
(Characteristic 4) A first combustor that heats the heat medium circulating in the heating mechanism and a second combustor that heats hot water supply water are installed.
(Feature 5) The first combustor and the second combustor are installed adjacent to each other in the gas heat source unit, and can share a power source, a gas pipe, and the like.

  Embodiments according to the present invention will be described below with reference to the drawings. FIG. 1 shows a hybrid hot water supply / room heating device 1 according to this embodiment. The hot water heater 1 includes a tank unit 11, a heat pump unit 12, a gas heat source unit 13, and a control device (not shown) that controls each unit.

  The tank unit 11 includes a hot water storage tank 101, a heat exchanger 102, a pump P2, and a pump P4. Hot water heated by the heat pump unit 12 is stored in the hot water storage tank 101. The heat exchanger 102 constitutes a heating mechanism, and exchanges heat between the heat medium circulating in the heating mechanism and the hot water in the hot water storage tank 101. The hot water storage tank 101 is a hermetically sealed type, and the outside is covered with a heat insulating material. In a state where hot water is stored, temperature stratification is formed inside the hot water storage tank 101, the water temperature in the lower part of the hot water storage tank 101 is low, and the water temperature in the upper part is high. Outlet ports 111 and 112 and inlet ports 113 and 118 are provided at the top of the hot water storage tank 101, and an inlet port 116 and an outlet port 117 are provided at the bottom. At the center of the hot water storage tank 101 in the height direction, an outlet 114 and an inlet 115 are provided. Above the hot water storage tank 101, temperature sensors TH1 and TH2 for detecting the temperature of hot water in the hot water storage tank are installed.

  The heat pump unit 12 is a refrigeration cycle apparatus in which a refrigerant circulates in this order through a compressor 121, a radiator 122, an expansion mechanism 123, and an evaporator 124 connected by piping. The water sent from the hot water storage tank 101 to the radiator 122 by the pump P5 is heated by the high-temperature and high-pressure refrigerant discharged from the compressor 121 in the radiator 122. As the expansion mechanism 123, an ejector or an expander may be used in addition to the expansion valve. The evaporator 124 is a fin tube type heat exchanger, and rotates a fan to exchange heat with the outside air.

  The gas heat source unit 13 includes a heating mechanism, a hot water supply mechanism, and a reheating mechanism. The heating mechanism includes a first combustor 141 that heats a heat medium circulating in the heating mechanism, a cistern 150, a high-temperature heating terminal (not shown), a low-temperature heating terminal (not shown), and a pump P1. The hot water supply mechanism includes a hot water supply channel 144, an upper water channel 145, and a mixer 146. The reheating mechanism includes a reheating heat exchanger 143 and a pump P3. Furthermore, the gas heat source unit 13 includes a second combustor 142 that heats the water in the hot water storage tank 101. The inlet of the high temperature heating terminal is connected to the high temperature heating terminal forward path 164, and the outlet is connected to the heating terminal return path 161. The inlet of the low temperature heating terminal is connected to the low temperature heating terminal forward path 165, and the outlet is connected to the heating terminal return path 161. The high temperature heating terminal forward path 164 is provided with a temperature sensor TH6 that detects the temperature of the heat medium.

  The first combustor 141 and the second combustor 142 are combustors that heat water or the like by burning fuel such as city gas or LP gas. The first combustor 141 and the second combustor 142 are installed adjacent to each other in the gas heat source unit 13 and can share a gas pipe, a power source, and the like.

  In this embodiment, water is used as the heat medium, and heating water is stored in the cistern 150. Hereinafter, in this embodiment, a case where heating water (water) is used as the heat medium will be described. However, for example, an antifreeze liquid mainly composed of ethylene glycol or the like can be used instead of water. The outlet 151 at the bottom of the cistern 150 is connected to the branch 171 by the second heating terminal forward path 163. A pump P1 is provided in the second heating terminal forward path 163, and a temperature sensor TH5 for detecting the temperature of the heat medium (heating water) is provided between the pump P1 and the branch portion 171. In the branch part 171, the pipe line is branched, one pipe line is connected to the low temperature heating terminal forward path 165, and the other pipe line is connected to the high temperature heating terminal forward path 164 via the first combustor 141 and the branch part 172. Connected to. The heating terminal return path 161 is connected to the heating hot water inlet of the heat exchanger 102, and the heating hot water outlet of the heat exchanger 102 is connected to the inlet 152 at the bottom of the systern 150 by the first heating terminal forward path 160. A switching valve V1 is provided in the heating terminal return path 161, and the bypass side that bypasses the heat exchanger 102 and connects to the first heating terminal outbound path 160 can be switched to the heat exchanger 102 side. The first heating terminal forward path 160 is provided with a temperature sensor TH4 that detects the temperature of the heat medium (heating water).

  In the systern 150, water for heating is stored. The cistern 150 is provided with a drainage port 154. When the water level exceeds the drainage port 154, the drainage is caused by overflow. Further, a water supply port 155 connected to the upper water channel 145 and a water level sensor 153 are provided, and heating water can be supplied to the systern 150 based on a detection value of the water level sensor 153.

  The outlet 114 in the center of the hot water storage tank 101 is connected to the hot water (water) inlet of the second combustor 142 via a pump P4 installed in the tank unit 11, and the hot water outlet of the second combustor 142 is The hot water storage tank 101 is connected to the inlet 113 at the top of the head. By circulating the water in the hot water storage tank 101 through the hot water supply combustion circuit including the outlet 114, the pump P4, the second combustor 142, and the inlet 113, the hot water temperature of the hot water storage tank 101 can be increased.

  As for the flow path of the heat exchanger 102 through which the hot water in the hot water storage tank 101 flows, the inlet side is connected to the outlet 111 by the heating hot water forward path 130, and the outlet side via the pump P2 by the third heating hot water return path 133. It is connected to the switching valve V3. The switching valve V <b> 3 is branched into a first heating hot water return path 131 connected to the introduction port 115 of the hot water storage tank 101 and a second heating hot water return path 132 connected to the hot water supply hot water path 134 at the junction 174. The hot water supply hot water path 134 is connected to the outlet 112 of the hot water storage tank 101, and is connected to the junction 175 in the gas heat source unit 13 via the junction 174.

  The junction 175 is connected to the hot water supply hot water path 134, the water supply path 145, and the hot water supply path 144. A pipe connecting the upper water channel 145 and the junction 175 is provided with a mixer 146 that controls the mixing ratio of the upper water and the hot water flowing into the junction 175 in accordance with the required temperature of hot water supply.

  The branching portion 172 is connected to a flow control valve V2 provided at the inlet of the reheating heat exchanger 143, and the outlet of the reheating heat exchanger 143 is a pipe connecting the first heating terminal forward path 160. It is connected to a junction 173 provided on the road. The reheating heat exchanger 143 has a double-pipe structure, and the heating / hot water flow path is on the inner side, and the flow path of the hot water stored in the bathtub is on the outer side. The pump P3 circulates the hot water stored in the bathtub in the reheating circuit.

Next, the hot water storage operation of the present embodiment will be described. The lower part of the hot water storage tank 101 is supplied with tap water from an inlet 116 connected to the tap water. The outlet 117 is connected to the radiator 122 of the heat pump unit 12, and low-temperature water at the lower part of the hot water storage tank 101 is supplied by the pump P 5, and heat is exchanged with the refrigerant in the radiator 122. In the present embodiment, CO ₂ is used as the refrigerant, and the temperature of the hot water at the outlet of the radiator 122 is heated to about 90 ° C. The heat pump unit 12 is controlled by a general refrigeration cycle apparatus control method. For example, it can be controlled based on the discharge temperature of the compressor 121, the outside air temperature, or the inlet temperature of the radiator 122 of water flowing in from the hot water storage tank 101.

  The hot water heated by the heat pump unit 12 is returned from the inlet 118 to the top of the hot water storage tank 101. The lower part of the water stored in the hot water storage tank 101 has a low temperature, and the temperature gradually increases toward the upper part. In the present embodiment, the hot water temperature above the hot water storage tank 101 is about 90 ° C.

  When the capacity of the heat pump unit 12 is insufficient, such as when the hot water heater 1 is started up or when the hot water storage tank 101 is out of hot water, the hot water in the hot water storage tank 101 is used using the hot water combustion circuit that passes through the second combustor 142. Is further heated. In the hot water supply combustion circuit, hot water having an intermediate temperature is extracted from the outlet 114, heated by the second combustor 142, and returned from the inlet 113 to the upper part of the hot water storage tank 101. The hot water in the hot water storage tank 101 is circulated through the hot water supply combustion circuit by the pump P4 and heated by the second combustor 142.

  Next, the heating operation of the present embodiment will be described. In the hot water supply and heating apparatus according to the present embodiment, heating is performed by heating the heating water using the hot water in the hot water storage tank and circulating the heated heating water to the heating mechanism. In the tank unit 11, high-temperature water in the upper part of the hot water storage tank 101 is extracted from the outlet 111 and is sent to the heat exchanger 102 constituting the heating mechanism through the heating / warming water outward path 130. The hot water after passing through the heat exchanger 102 is returned to the switching valve V3 through the third heating hot water return path 133 constituting the heating mechanism. When there is no demand for hot water supply, the switching valve V3 is connected to the first heating hot water return path 131 side, and the hot water from the heat exchanger 102 is returned to the hot water storage tank 101. When there is a demand for hot water supply, the switching valve V3 is connected to the second heating hot water return path 132 side, and the hot water from the heat exchanger 102 can be used as hot water supply water.

  In the heat exchanger 102, the heating water is heated by the hot water from the hot water storage tank 101. The heated heating water is introduced into the cistern 150 from the first heating terminal forward path 160, pumped out from the outlet 151 at the bottom of the cistern by the pump P <b> 1, and is divided in the branching section 171. One of the divided heating water flows into the low temperature heating terminal forward path 165. The other passes through the first combustor 141 and then flows into the high-temperature heating terminal forward path 164 via the branch 172. Heating water that has passed through the high temperature heating terminal and the low temperature heating terminal is mixed, flows through the heating terminal return path 161, flows into the heat exchanger 102, and is heated again by the hot water from the hot water storage tank 101. As described above, the heating water heated by the heat exchanger 102 circulates through the heating mechanism, returns to the heat exchanger 102, and is heated again.

  If the flow regulating valve V2 is opened and the heating water flowing through the high-temperature heating terminal forward path 164 (heating water after passing through the first combustor 141) is introduced from the branching portion 172 to the reheating heat exchanger 143, the reheating of the bath It is also possible to whisper. In the reheating mechanism, the hot water stored in the bathtub by the pump P3 is circulated to the outer pipe of the reheating heat exchanger 143, and is exchanged with the heating water passing through the inner pipe of the reheating heat exchanger 143. Then, I will catch up. The heating water used for reheating joins the heating water flowing through the first heating terminal forward path 160 at the junction 173 and is returned to the bottom of the systern 150. The first combustor 141 can also be operated according to the set temperature for reheating.

  Next, the hot water supply operation of the present embodiment will be described. In the hot water supply / room heating device according to the present embodiment, hot water taken out from the outlet 112 of the hot water storage tank 101 is supplied from the hot water supply / hot water path 134 to the junction 175 constituting the hot water supply mechanism. In the hot water supply mechanism, hot water from the hot water storage tank 101 is appropriately mixed with clean water, and hot water is supplied from the hot water supply path 144 to the hot water supply terminal. In accordance with the amount of hot water flowing in from the hot water supply hot water path 134, clean water is supplied from the water supply path 145 to the inlet 116 of the hot water storage tank 101 via the mixer 146.

  When the switching valve V <b> 3 is connected to the first heating / warm water return path 131 side, the hot water supply / hot water path from the outlet 112 according to the amount of water sent by the mixer 146 to the inlet 116 at the bottom of the hot water storage tank 101. The hot water is supplied to the junction 175 constituting the hot water supply mechanism by 134.

  When the switching valve V3 is connected to the second heating / hot water return path 132 side, hot water from the heating mechanism is supplied to the hot water supply / hot water path 134 by the pump P2. The hot water flowing into the hot water hot water path 134 from the second heating hot water return path 132 merges with the hot water taken out from the outlet 112 at the junction 174, passes through the hot water hot water path 134, and is supplied to the hot water supply mechanism at the junction 175. The In the junction 175, the hot water supplied from the hot water supply hot water path 134 and the clean water supplied from the water supply path 145 are appropriately mixed and supplied to the hot water supply path 144.

  Based on the required temperature of hot water supply, the temperature of the hot water in the upper part of the hot water storage tank 101, the temperature of the hot water from the heat exchanger, the temperature of the clean water, etc., the mixer 146 Adjust the mixing ratio. Hot water is supplied to the junction 175 from the outlet 112 of the hot water storage tank 101 according to the difference between the amount of water flowing into the hot water storage tank 101 by the mixer 146 and the amount of hot water flowing out of the hot water storage tank 101 by the pump P2.

  In the present embodiment, the control device switches the flow path of the switching valve V3 based on the presence or absence of hot water supply demand and the detected value of the temperature sensor TH1 provided in the upper part of the hot water storage tank. When there is a demand for hot water supply water that is hotter than the hot water in the upper part of the hot water storage tank 101, the hot water temperature in the upper part of the hot water storage tank 101 is rapidly increased using the second combustion device 142 by the hot water supply combustion circuit. can do.

  According to the present embodiment, when there is a demand for hot water supply, the heat energy of medium to high temperature hot water returning from the heat exchanger constituting the heating mechanism is effectively utilized by the hot water supply mechanism. The hot water returning from the heating mechanism is not returned to the hot water storage tank but is used as hot water supply water, and the hot water is supplied to the hot water storage tank at a lower temperature, so that the water temperature at the lower part of the hot water storage tank can be kept low. Thereby, the temperature of the water sent from the lower part of the hot water storage tank to the heat pump unit can be kept low, so that the heat pump unit can be operated with high efficiency. In a hybrid water heater / heater equipped with a heat pump and a combustor as heat sources, a heat pump that is a low-cost heat source can be used effectively, so that low-cost operation can be realized.

  Next, operation control of the hot water supply / room heating device according to the present embodiment will be described. In the present embodiment, each unit is controlled by the control device in accordance with the flowcharts shown in FIGS.

(Low temperature heating operation + hot water supply)
Operation control in the present embodiment when hot water supply demand occurs during low-temperature heating operation will be described using the flowcharts shown in FIGS. 2 and 3. In the flowchart described below, at the start of operation, the switching valve V1 is connected to the bypass side (bypass 162 side) and the switching valve V3 is connected to the tank side (hot water storage tank 101 side). The flow control valve V2 is closed.

  When the low-temperature heating operation is started in step S11, first, in step S12, it is determined whether the hot water temperature in the hot water storage tank 101 is equal to or higher than the temperature that can be used for heating. Specifically, when the temperature A equal to or higher than the required temperature for low-temperature heating is set and the detection value of the temperature sensor TH1 installed at the upper part of the hot water storage tank 101 is not equal to or higher than the temperature A, the process proceeds to step S13, and the pump After turning on P1, the heating operation by the first combustor 141 is performed in step S14. During this time, the hot water heated by the heat pump unit 12 is stored in the hot water storage tank 101, and the hot water temperature in the hot water storage tank 101 rises. If the detected value of the temperature sensor TH1 is equal to or higher than the temperature A in step S12, the process proceeds to step S15.

  FIG. 3 shows a flowchart of the heating operation by the first combustor 141 that is performed in steps S14 and S20 of FIG. In the heating operation by the first combustor 141, heating is performed by heating the water for heating by the first combustor 141. A temperature D (40 to 70 ° C.) is set according to the required temperature for low-temperature heating, and in step S71, the first combustion is performed so that the detected value of the temperature sensor TH5 installed in the second heating terminal forward path 163 becomes the temperature D. The amount of combustion of the machine 141 is controlled. In the next step S72, when the heating is ON, the process proceeds to step S73. When it is determined that the heating is turned off, the process proceeds to step S28 shown in FIG. 2, the switching valve V1 is set to the bypass side, the pumps P1 and P2 are stopped, and the operation is ended. In step S73, it is determined again whether the hot water temperature in the hot water storage tank 101 is equal to or higher than the temperature available for heating. When the temperature C equal to or higher than the temperature required for the low temperature heating is set and the detected value of the temperature sensor TH2 installed at the upper part of the hot water storage tank 101 is equal to or higher than the temperature C, the heating operation by the first combustor 141 is terminated, The process proceeds to step S15 shown in FIG. When the detected value of the temperature sensor TH2 is lower than the temperature C, the process returns to step S71 and heating of the heating water by the first combustor 141 is continued. In this embodiment, in order to prevent operation hunting, the temperature C is set lower than the temperature A, and the first combustor 141 is controlled based on the detected value of the temperature sensor TH2.

  In step S15, heating of the heating water by the hot water in the hot water storage tank 101 is started. Specifically, in step S15, the switching valve V1 is connected to the heat exchanger side (heat exchanger 102 side), the switching valve V3 is connected to the tank side (first heating hot water return path 131 side), and the pumps P1 and P2 are It becomes ON. As a result, the hot water and the heating water from the hot water storage tank 101 circulate in the heat exchanger 102. Next, in step S16, the detected value of the temperature sensor TH4 installed in the heating terminal forward path 163 becomes the temperature F with respect to the temperature F (40 to 70 ° C.) set according to the required temperature for low temperature heating. The pump P2 is controlled.

  During the low temperature heating operation, a temperature B equal to or higher than the temperature required for the low temperature heating is set, and the hot water temperature in the hot water storage tank 101 is controlled so as not to become lower than the temperature B. The temperature B is set lower than the temperature A in order to prevent operation hunting. Specifically, when it is determined in step S17 that the detected value of TH1 is lower than the temperature B, in step S18, the pump P2 is turned off, the switching valve V1 is switched to the bypass side, and the Suspend heating water using hot water. In step S20, the heating water is heated by the first combustor 141, and the water in the hot water storage tank 101 is heated by the heat pump unit 12 during this time. In the next step S20, similarly to step S14, heating by the first combustor 141 is performed according to the flowchart of FIG. When it is determined in step S73 that the detected value of TH2 is equal to or higher than temperature C, the heating operation by the first combustor 141 is terminated, and the process proceeds to step S21. In step S21, the pump P2 is turned ON, the switching valve V1 is switched to the heat exchanger side, heating of the heating water using the hot water from the hot water storage tank 101 is resumed, and the process proceeds to step S22. If it is determined in step S17 that TH1 ≧ B, the process proceeds to step S22. As described above, the heating water is appropriately heated by the first combustor 141, so that the heat release from the hot water storage tank 101 is interrupted and the hot water temperature of the hot water storage tank 101 is quickly increased by the heat pump unit 12. Can be avoided.

  In step S22, when the heating is ON, the process proceeds to step S23 for determining whether or not there is a hot water supply demand. When it is determined that the heating is turned off, the process proceeds to step S28, the switching valve V1 is set to the bypass side, the pumps P1 and P2 are stopped, and the operation is ended.

  If there is a demand for hot water supply in step S23, the switching valve V3 is switched to the hot water supply side (second heating hot water return path 132 side) in step S24, and the hot water in the hot water storage tank 101 returning from the heat exchanger 102 is the second hot water. It flows into the heating hot water return path 132 and is used as hot water supply water by the hot water supply mechanism. If heating is turned on in step S25, the process proceeds to step S26. When it is determined that the heating is turned off, the process proceeds to step S28, the switching valve V1 is set to the bypass side, the pumps P1 and P2 are stopped, and the operation is ended. In step S <b> 26, the switching valve V <b> 3 is controlled according to the detected value of the temperature sensor TH <b> 1 above the hot water storage tank 101 and the presence or absence of hot water supply demand. When the detected value of the temperature sensor TH1 is lower than the temperature B, or when there is no demand for hot water supply and it is determined that the hot water supply is OFF, the process proceeds to step S27 to switch the switching valve V3 or the like to the tank side and perform heat exchange. The hot water supply using the hot water from the vessel 102 is stopped, and the process returns to step S16. At this time, when the hot water supply demand continues, the hot water in the upper part of the hot water storage tank 101 taken out from the outlet 112 is supplied to the hot water supply mechanism by the hot water supply hot water path 134. When the detected value of the temperature sensor TH1 is equal to or higher than the temperature B and there is a demand for hot water supply, hot water supply using hot water from the heat exchanger 102 is continued.

  In the present embodiment, the operation control is performed with the temperature A = 70 ° C., the temperature B = 65 ° C., the temperature C = 65 ° C., the temperature D = 60 ° C., and the temperature F = 60 ° C. According to this, when the temperature of the hot water entering the heat exchanger 102 from the hot water storage tank 101 is 90 ° C., the temperature of the hot water after passing through the heat exchanger 102 is about 45 ° C. The temperature of the heating water in the heating terminal return path 161 is about 40 ° C., and the temperature of the heating water after passing through the heat exchanger 102 is about 60 ° C. The temperature of the hot water flowing through the hot water supply hot water passage 134 is about 55 ° C., and is mixed with 10 ° C. clean water at the junction 175. 10 ° C. clean water flows into the hot water storage tank 101 by the mixer 146. Thereby, the water temperature of the lowest part of the hot water storage tank 101 becomes about 10 ° C., which is about the same as that of clean water, and the water of about 10 ° C. is sent from the outlet 117 to the radiator 122 of the heat pump unit 12 and heated.

  As described above, when hot water supply demand occurs during low-temperature heating, for example, hot water of about 45 ° C. returning from the heat exchanger 102 to the switching valve V3 can be supplied to the hot water supply mechanism. At the same time, about 10 ° C. of clean water can be supplied to the lower part of the hot water storage tank 101 according to the amount of hot water supplied from the heat exchanger 102 supplied to the hot water supply mechanism, so that the heat pump unit 12 can be operated with high efficiency. . Moreover, since the hot water temperature in the hot water storage tank 101 is detected and heating water is appropriately heated by the first combustor, it is possible to prevent the hot water storage tank 101 from running out of hot water.

(High temperature heating operation + hot water supply)
Operation control in this embodiment when hot water supply demand occurs during high-temperature heating operation will be described with reference to the flowchart of FIG.

  When the high-temperature heating operation is started in step S31, heating of the heating water by the first combustor 141 is started. Specifically, in step S32, the switching valve V3 is connected to the tank side 11, the pump P1 is turned on, and the first combustor 141 that heats the heating water is turned on. The temperature E (60 to 90 ° C.) is set according to the required temperature for the high temperature heating. In step S33, the temperature E is set so that the detected value of the temperature sensor TH6 installed in the high temperature heating terminal forward path 164 becomes the temperature E. The combustion amount of one combustor 141 is controlled. In the next step S34, when the heating is ON, the process proceeds to step S35 for determining whether or not there is a hot water supply demand. When it is determined that the heating is turned off, the process proceeds to step S41, the pump P1 is stopped, and the operation is ended.

  In step S35, when there is a hot water supply demand, the process proceeds to step S36, and when the detected value of the temperature sensor TH1 is equal to or higher than the temperature A, the process further proceeds to step S37. In step S37, the first combustor 141 is turned off, the switching valve V1 is switched to the heat exchanger side, the switching valve V3 is switched to the hot water supply side, and the pump P2 is turned on. As a result, heating of the heating water using hot water from the hot water storage tank 101 and hot water supply using hot water from the heat exchanger 102 are started. The temperature G (60 to 90 ° C.) is set according to the required temperature for high-temperature heating. In step S38, the pump P2 is controlled so that the detected value of the temperature sensor TH4 becomes the temperature G, and the process proceeds to step S39. If there is no demand for hot water supply in step S35, the process returns to step S33.

  If it is determined in step S39 that the detected value of the temperature sensor TH1 is lower than the temperature B, or if there is no hot water supply demand and it is determined that the hot water supply is OFF, the process proceeds to step S40. In step S40, heating of the heating water using the hot water in the hot water storage tank 101 is stopped by the reverse operation of step S37, heating of the heating water by the first combustor 141 is started, and the process returns to step S33. In step S39, when the detected value of the temperature sensor TH1 is equal to or higher than the temperature B and there is a demand for hot water supply, hot water supply using hot water from the heat exchanger 102 is continued.

  In this embodiment, the operation control is performed with the temperature A = 90 ° C., the temperature B = 85 ° C., the temperature E = 80 ° C., and the temperature G = 80 ° C. According to this, when the temperature of the hot water entering the heat exchanger 102 from the hot water storage tank 101 is 90 ° C., the temperature of the hot water after passing through the heat exchanger 102 is about 65 ° C. The temperature of the heating water in the heating terminal return path 161 is about 60 ° C., and the temperature of the heating water after passing through the heat exchanger 102 is about 80 ° C. The temperature of the hot water flowing through the hot water supply hot water passage 134 is about 70 ° C., and is mixed with 10 ° C. clean water at the junction 175. 10 ° C. clean water flows into the hot water storage tank 101 by the mixer 146, and the water temperature at the bottom of the hot water storage tank 101 becomes about 10 ° C., which is the same level as the clean water.

  As described above, when hot water supply demand occurs during high-temperature heating, for example, hot water of about 65 ° C. returning from the heat exchanger 102 to the switching valve V3 can be used as hot water supply water. At the same time, since hot water of about 10 ° C. can be supplied to the lower part of the hot water storage tank 101, the heat pump unit 12 can be operated with high efficiency. Since the temperature of the hot water returning from the heat exchanger 102 is particularly high during high-temperature heating, when the temperature is returned to the hot water storage tank 101, the temperature of the water supplied from the hot water storage tank 101 to the heat pump unit 12 becomes too high and the heat pump unit 12 is operated. It may not be possible. According to this embodiment, when a hot water supply demand occurs, the heat pump unit 12 can be efficiently operated even in high-temperature heating.

Further, when CO ₂ is used as the refrigerant in the heat pump unit 12 as in the present embodiment, the boiling temperature can be set to about 90 ° C., so the first combustor that heats the heating water The simultaneous operation of high temperature heating and hot water supply can be performed without using 141. For example, the heat pump unit 12 can be used effectively also when performing hot air heating (high temperature heating) of a bathroom or a dressing room while performing hot water supply (hot water supply) of a bath.

(Low temperature heating + High temperature heating operation + Hot water supply)
Operation control in the present embodiment when hot water supply demand occurs during simultaneous operation of high-temperature heating and low-temperature heating will be described using the flowchart of FIG. In addition, since most parts are common with the case where high-temperature heating and hot water supply shown in FIG. 4 are performed simultaneously, description of common parts is omitted.

  When the low temperature heating operation and the high temperature heating operation are started in step S51, the process proceeds to step S52. Steps S52 to S56 and S61 are the same as steps S32 to S36 and S41 of FIG.

  In step S57, the point which the 1st combustor 141 continues driving | running differs from step S37. Heating water from the cistern 150 directly flows into the low temperature heating terminal outbound path 165, and heating water heated by the first combustor 141 flows into the high temperature heating terminal outbound path 164. The control in step S53 is continued, and the first combustor 141 is controlled such that the detected value of the temperature sensor TH6 becomes the temperature E. The subsequent step S58 is different from step S38 in that the pump P2 is controlled so that the detected value of the temperature sensor TH4 becomes the temperature F set according to the required temperature for low temperature heating.

  In the subsequent step S59, the same determination as in step S39 is performed. If the detected value of the temperature sensor TH1 is lower than the temperature B, or if it is determined that there is no hot water supply demand and the hot water supply is OFF, the process proceeds to step S60. In step S60, an operation opposite to that in step S57 is performed, and the process returns to step S53. In step S59, when the detected value of the temperature sensor TH1 is equal to or higher than the temperature B and there is a demand for hot water supply, hot water supply using hot water returning from the heat exchanger 102 is continued.

  In this embodiment, the operation control is performed with the temperature A = 70 ° C., the temperature B = 65 ° C., the temperature E = 80 ° C., and the temperature F = 60 ° C. According to this, when the temperature of the hot water entering the heat exchanger 102 from the hot water storage tank 101 is 90 ° C., the temperature of the hot water after passing through the heat exchanger 102 is about 55 ° C. The temperature of the heating water in the heating terminal return path 161 is about 50 ° C., and the temperature of the heating water after passing through the heat exchanger 102 is about 60 ° C. The temperature of the hot water flowing through the hot water supply hot water path 134 is about 60 ° C., and is mixed with 10 ° C. clean water at the junction 175. 10 ° C. clean water flows into the hot water storage tank 101 by the mixer 146, and the water temperature at the bottom of the hot water storage tank 101 becomes about 10 ° C., which is the same level as the clean water.

  As described above, when a hot water supply demand is generated during simultaneous operation of low temperature heating and high temperature heating, for example, hot water of about 55 ° C. returning from the heat exchanger 102 to the switching valve V3 is used as hot water supply water. Can do. At the same time, since hot water of about 10 ° C. can be supplied to the lower part of the hot water storage tank 101, the heat pump unit 12 can be operated with high efficiency.

  As described above, according to the present embodiment, during the simultaneous operation of hot water supply and heating, the hot water in the hot water storage tank is mixed with the hot water supplied to the hot water supply mechanism after exchanging heat with the heating water in the return path of the heating terminal. Since it is supplied to the terminal, the thermal energy of the hot water returned to the hot water storage tank can be used effectively by the hot water supply mechanism. Since the hot water is supplied to the lower part of the hot water storage tank according to the hot water of the hot water storage tank supplied to the hot water supply mechanism, the water temperature in the lower part of the hot water storage tank can be kept low. Thereby, the temperature of the water sent from the lower part of the hot water storage tank to the heat pump unit can be kept low, so that the heat pump unit can be operated with high efficiency. In a hybrid water heater / heater equipped with a heat pump and a combustor as heat sources, a heat pump that is a low-cost heat source can be used effectively, so that low-cost operation can be realized.

  Further, in this embodiment, the switching valve is operated based on the presence or absence of hot water supply demand and the water temperature of the water stored in the hot water storage tank, and the combustor that heats the heating medium can be operated appropriately. The amount of hot water is secured, the occurrence of hot water can be prevented, and the operation control can be stably performed.

In the present embodiment, the case where CO ₂ is used as the refrigerant has been described. However, if the inlet temperature of water heated by the heat pump unit is lowered, the efficiency of the heat pump unit is improved by the The same applies to other refrigerants. This contributes to improving the efficiency of the heat pump unit and enables low-cost operation of the hybrid hot water supply / heating device.

  In Example 1, although the case where the water stored in the hot water storage tank was used for hot water supply water was demonstrated, as shown in Example 2, in the case where the water stored in the hot water storage tank is used as heating water (heat medium) In addition, the present invention can be effectively implemented.

  FIG. 6 is a diagram illustrating the hot water supply / room heating device 2 according to the second embodiment. The hot water supply / room heating device 2 includes a tank unit 21, a heat pump unit 22, a gas heat source unit 23, and a control device (not shown) for controlling each unit.

  The tank unit 21 includes a hot water storage tank 201 and a systern 250 installed on the upper part of the hot water storage tank 201. The hot water storage tank 201 is an open type, and stores the heating water heated by the heat pump unit 22. In the upper part of the hot water storage tank 201, an outlet port 211 connected to the heating / warm water outgoing path 230, an outlet port 212 connected to the hot water supply / hot water path 234, and an inlet port 218 through which hot water from the heat pump unit 22 flows are provided. In the central part of the hot water storage tank 201, an introduction port 215 connected to the first heating hot water return path 231 is provided. At the bottom of the hot water storage tank 201, an introduction port 216 connected to the hot water supply hot water return path 235 and an outlet port 217 for sending water below the hot water storage tank 201 to the heat pump unit 22 are provided. The switching valve V5 connected to the third heating / warm water return path 233 can switch the flow path of the heating water between the first heating / warm water return path 231 and the second heating / warm water return path 232. The second heating / warm water return path 232 is connected to the hot water supply / hot water path 234 at the junction 274, and the hot water supply / hot water return path 235 is provided with a pump P6 for circulating heating water.

  Since the heat pump unit 22 has the same configuration as the heat pump unit 12 according to the first embodiment, the description thereof is omitted.

  The gas heat source unit 23 includes a first combustor 241 constituting a heating mechanism, a high temperature heating terminal (not shown), a low temperature heating terminal (not shown), a mixing valve V4, a pump P7, and a second combustor for heating hot water. 242, a heat exchanger 275 constituting a hot water supply mechanism, a hot water supply passage 244, an upper water passage 245, a mixer 246, a reheating heat exchanger 243 constituting a reheating mechanism, and the like.

  Hot water (heating water) from the hot water storage tank flows into the mixing valve V4 from the heating hot water outbound path 230, and part of the heating water from the heating terminal return path 261 constituting the heating mechanism flows into the mixing valve V4. A temperature sensor TH8 is provided in the heating terminal forward path 260 on the downstream side of the mixing valve V4, and the mixing valve V4 is controlled based on the target temperature set according to the required temperature for heating and the detected value of the temperature sensor TH8. Is done. The heating water merged by the mixing valve V4 is branched into the high temperature heating terminal forward path 264 and the low temperature heating terminal forward path 265 at the branching portion 271. Heating water after passing through the high temperature and low temperature heating terminals reaches the branching portion 272 from the heating terminal return path 261. In the branch part 272, a part of heating water is sent to the mixing valve V4. The remaining heating water is sent to the switching valve V5 from the third heating / warm water return path 233 constituting the heating mechanism. As described above, the heating water sent from the mixing valve V4 circulates through the heating mechanism, a part thereof returns to the mixing valve V4, and the rest is returned from the heating mechanism to the switching valve V5.

  When the switching valve V5 is connected to the first heating / hot water return path 231 side, the heating water is returned to the inlet 215 at the center of the hot water storage tank 201. When the switching valve V5 is connected to the second heating hot water return path 232 side, the heating water merges with the hot water from the hot water storage tank 201 flowing through the hot water supply hot water path 234 at the junction 274, and forms the hot water supply mechanism. After passing through the exchanger 275 and heating the hot water supply water, it is returned to the inlet 216 at the bottom of the hot water storage tank 201. Since the heat exchanger 275 exchanges heat with hot water supply water, the heating water having a lower temperature is stored in the hot water storage tank than when the switching valve V5 is connected to the first heating hot water return path 231 side and the heating water is returned directly to the hot water storage tank 201. It can return to 201.

  The switching valve V5 is connected to the first heating / hot water return path 231 side when there is no demand for hot water supply, and connected to the second heating / warm water return path 232 side when there is a demand for hot water supply. Can be used for heating hot water. Similarly to the first embodiment, even when there is a hot water supply demand, when the hot water temperature in the hot water storage tank 201 becomes low, the switching valve V5 can be switched to the first heating hot water return path 231 side. .

  In the heat exchanger 275, the hot water sent from the upper water passage 245 is heated by the heating water supplied from the hot water supply hot water passage 234, and supplied as hot water supply water from the hot water supply passage 244. A temperature sensor TH7 is provided in the outlet channel on the hot water supply side of the heat exchanger 275, and the pump P6 of the tank unit 21 is controlled based on the detection value of the temperature sensor TH7. The amount of heat exchange can be adjusted. By switching the switching valve V6, the hot water supply water heated by the heat exchanger 275 can be sent to the second combustor 242, and further heated.

  As described above, even when the heating water for circulating the heating mechanism in the hot water storage tank is stored, the first heating hot water return path for returning the hot water flow path from the heating mechanism to the hot water storage tank and the hot water from the heating mechanism by the switching valve. Can be switched to any one of the second heating hot water return path that supplies the hot water to the upstream side of the hot water supply mechanism of the hot water supply hot water path. The water supplied to the hot water supply mechanism passes through a heat exchanger provided in the hot water supply mechanism, is heated by the heating water, and then is supplied with hot water. Thereby, the thermal energy of the hot water (heating water) returned to the hot water storage tank can be used for heating the hot water supply water. In addition, the temperature of the heating water (hot water) returned to the hot water storage tank can be lowered and the water temperature at the bottom of the hot water storage tank can be kept low, so the temperature of the water heated by the heat pump unit is also kept low, making the heat pump highly efficient. I can drive.

  As mentioned above, although the Example of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

1, 5 Hot water supply and heating devices 11, 21 Tank units 12, 22 Heat pump units 13, 23 Gas heat source units 101, 201 Hot water storage tanks 102, 275 Heat exchangers 111, 112, 114, 117, 211, 212, 217 Hot water storage tank outlets 113, 115, 116, 118, 215, 216 Hot water storage tank inlet 121 Compressor 122 Radiator 123 Expansion mechanism 124 Evaporator 130, 230 Heating hot water outgoing path 131, 231 First heating hot water return path 132, 232 Second heating hot water return path 133 233 3rd heating hot water return path 134, 234 Hot water supply hot water path 141, 241 1st combustor 142, 242 2nd combustor 144, 244 Hot water supply path 145, 245 Mixer 150, 250 cis turn 151 cis turn 151 outlet 152 cis turn inlet 153 Water level sensor 154 Discharge port 155 Water supply port 160 First heating terminal outbound route 161, 261 Heating terminal return route 162 Bypass 163 Second heating terminal outbound route 164, 264 High temperature heating terminal outbound route 165, 265 Low temperature heating terminal outbound route 171, 172, 271, 272 Branch Parts 173, 174, 175, 274 Junction part 260 Heating terminal forward path P1, P2, P3, P4, P5, P6, P7 Pump TH1, TH2, TH4, TH5, TH6, TH7, TH8 Temperature sensors V1, V3, V5, V6 Switching valve V2 Flow control valve (Flow control valve)
V4 mixing valve

Claims (4)

A heat pump, a hot water storage tank for storing hot water heated by the heat pump, a hot water supply mechanism for supplying hot water using the hot water of the hot water storage tank, a heating mechanism for heating using hot water of the hot water storage tank, and the heating mechanism are provided. A hot water heater with a combustor,
A hot water supply hot water path for sending the hot water in the hot water storage tank to the hot water supply mechanism;
A heating and warm water outbound path for sending warm water from the hot water storage tank to the heating mechanism;
A first heating hot water return path for returning hot water from the heating mechanism to the hot water storage tank;
A second heating hot water return path for supplying hot water from the heating mechanism to the upstream side of the hot water supply mechanism of the hot water supply hot water path;
A hot water supply and heating device comprising: a switching valve that switches a destination of hot water from the heating mechanism to either the first heating return path or the second heating return path.   The hot water supply and heating device according to claim 1, wherein the switching valve switches the destination of hot water from the heating mechanism to the second heating and hot water return path when performing hot water supply and heating simultaneously.   When the temperature of the hot water in the hot water storage tank is less than a predetermined temperature, the switching valve directs the destination of the hot water from the heating mechanism to the first heating / hot water return path even when performing hot water supply and heating simultaneously. The hot water supply and heating device according to claim 2, wherein the hot water supply and heating device is switched. The heating mechanism includes a heat exchanger for exchanging heat between the heat medium circulating in the heating mechanism and the hot water in the hot water storage tank,
The heating hot water outbound path sends hot water from the hot water storage tank to the heat exchanger,
The first heating hot water return path returns the hot water from the heat exchanger to the hot water storage tank,
The second heating hot water return path supplies hot water from the heat exchanger upstream of the hot water supply mechanism of the hot water supply hot water path,
The hot water supply and heating device according to claim 1, wherein the hot water supply mechanism mixes hot water and clean water from the hot water supply hot water path and supplies them to a hot water supply terminal.

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