KR101516863B1 - Heating system - Google Patents

Abstract

The present invention provides a heating system capable of appropriately changing the flow rate of a heating medium passing through a heat exchanger according to various situations. The hot water heating system 2 includes a heat pump 50, a tank 10, a tank water circulation path 20, a three-fluid heat exchanger 58, a water circulation path 71 for heating, a burner heating device 82, 76). The heating water circulation path 71 has a heating bypass path 94 and a regulating valve 90. The heating bypass line 94 connects the upstream side and the downstream side of the three-fluid heat exchanger 58. The adjustment valve 90 changes the ratio of the flow rate of the water passing through the three-fluid heat exchanger 58 to the flow rate of the water passing through the heating bypass path 94 by changing the opening degree.

Description

Heating system {HEATING SYSTEM}

The technique disclosed herein relates to a heating system.

Japanese Patent Application Laid-Open No. 2009-299941 discloses a heat pump that circulates a first heat medium, a second heat medium circulation path that circulates a second heat medium, and a heat exchange device that heats the second heat medium by heat exchange between the first heat medium A hot water supply system including a heater for heating the second heat medium and a heater for heating by using the heat of the second heat medium, the hot water supply system being higher in heating ability than the tile and the heat pump. In the system of Japanese Patent Application Laid-Open No. 2009-299941, a bypass path for bypassing the heat exchanger is provided in the second heat medium circulation path, and at the same time, an on-off valve for opening and closing the bypass path is provided.

Patent Document 1: JP-A-2009-299941

In the technique disclosed in Japanese Patent Application Laid-Open No. 2009-299941, the opening / closing valve can switch only two states, that is, a state in which the bypass line is opened and a state in which the bypass line is closed. Therefore, a technique for appropriately changing the flow rate of the heat medium passing through the heat exchanger according to various situations is required. The present disclosure provides a heating system capable of appropriately changing the flow rate of a heating medium passing through a heat exchanger according to various situations.

The heating system disclosed in this specification includes a heat pump, a tank, a tank water circulation passage, a first heat exchanger, a second heat medium circulation passage, a second heat exchanger, a heating device, a heater, a first bypass, Respectively. The heat pump has a first heat medium circulation path for circulating the first heat medium. The tank stores the water to be supplied to the hot water use part. The tank water circulation path introduces water in the tank and returns the introduced water to the tank. The first heat exchanger heats the water in the tank water circulation path by heat exchange with the first heat medium. And the second heat medium circulation path circulates the second heat medium. The second heat exchanger heats the second heat medium by heat exchange with the first heat medium. The heating device has a higher heating capability than the heat pump and heats the second heat medium. The radiator uses the heat of the second heat medium to heat it. The first bypass is provided in the second heat medium circulation passage and connects the upstream side and the downstream side of the second heat exchanger. The adjustment valve is provided in the first bypass passage and changes the ratio of the flow rate of the second heat medium passing through the second heat exchanger and the flow rate of the second heat medium passing through the first bypass path by changing the opening degree.

The first heat exchanger and the second heat exchanger may be separate heat exchangers. The first heat exchanger and the second heat exchanger may be configured as one three-fluid heat exchanger capable of heat exchange between the first heat medium circulation path and the tank water circulation path, and between the first heat medium circulation path and the second heat medium circulation path.

In the heating system, the ratio of the flow rate of the second heat medium passing through the second heat exchanger and the flow rate of the second heat medium passing through the first bypass path can be changed by changing the degree of opening of the regulating valve. Therefore, in this heating system, for example, it is necessary to heat the second heating medium in the second heat exchanger by adjusting the opening degree of the adjusting valve, and only a part of the second heating medium flowing in the second heat medium circulation path in the second heat exchanger The flow rate of the second heat medium passing through the second heat exchanger can be appropriately changed according to various situations such as a situation where the second heat medium is not heated by the second heat exchanger.

Fig. 1 is a diagram schematically showing the operation of the hot water heating system in the first embodiment at the time of heat accumulation (heat accumulation) operation and hot water operation.
2 is a flowchart showing a process executed by the hot water supply heating system at the time of the heating operation.
3 is a diagram schematically showing the operation of the hot water heating system during the first heating operation.
4 is a diagram schematically showing the operation of the hot water heating system during the second heating operation.
5 is a diagram schematically showing the operation of the hot water heating system during the third heating operation.
6 is a diagram schematically showing the operation of the hot water heating system during the fourth heating operation.
7 is a diagram schematically showing the operation of the hot water heating system during freeze prevention operation.
8 is a diagram schematically showing the operation of the hot water heating system during the defrosting operation.
9 is a diagram schematically showing a configuration of a hot water heating system according to the second embodiment.
10 is a diagram schematically showing the configuration of the hot water heating system of the third embodiment.

The main features of the embodiments described below will be described. Further, the technical elements described below are independent technical elements, and each of them exhibits technical usefulness alone or in various combinations, and is not limited to the combinations described in the claims at the time of filing.

(Feature 1) It is preferable that the heating system is capable of executing the first heating operation, the second heating operation, the third heating operation, and the fourth heating operation. In the first heating operation, the opening degree of the regulating valve is adjusted so that the entire second heat medium circulating in the second heat medium circulation path is passed through the second heat exchanger, the second heat medium is heated by the heat pump and the heating device, . In the second heating operation, the degree of opening of the regulating valve is controlled such that a part of the second heat medium circulating in the second heat medium circulation path passes through the second heat exchanger and the other part passes through the first bypass path, And the second heating medium is heated by the heating device to operate the heater. In the third heating operation, the opening degree of the regulating valve is controlled so that all of the second heating medium circulating in the second heating medium circulation path is adjusted to pass through the first bypass path, and the second heating medium is heated by the heating device to operate the heater . In the fourth heating operation, the degree of opening of the regulating valve is adjusted so that at least a part of the second heat medium circulating in the second heat medium circulation path passes through the second heat exchanger, the second heat medium is heated by the heat pump, .

According to this configuration, when the first heating operation, the second heating operation, or the third heating operation is performed in the heating system, the second heating medium can be heated in the heating apparatus having a higher heating ability than the heat pump. Here, the "heating capability of the heating apparatus is higher than that of the heat pump" includes that the heating amount per unit time of the heating apparatus is larger than the heating amount per unit time of the heat pump. The heat pump is capable of heating water with high efficiency, while the heating capacity (amount of heating per unit time) is not so high. Therefore, when the first heating operation, the second heating operation, or the third heating operation is performed, the second heating medium can be rapidly heated or heated to a high temperature. Therefore, the heater can be operated rapidly or can be operated with high output. When the first heating operation or the second heating operation is performed, the second heat medium can be heated by using the heat pump and the heating device in combination. Therefore, when the first heating operation or the second heating operation is performed, the second heating medium is rapidly heated or heated to a high temperature, and the second heating medium can be efficiently heated. When the fourth heating operation is performed, the second heat medium can be heated using only the heat pump. Therefore, when the fourth heating operation is performed, the second heating medium can be efficiently heated. As described above, the heating system can be switched between the first heating operation and the fourth heating operation, depending on the situation, and can be executed. Therefore, the heating system can perform proper operation according to the situation.

(Feature 2) In the heating system, the first heating operation is performed immediately after the start of the operation of the heater, the second heating operation is performed thereafter, the third heating operation is then performed, and then the fourth heating operation is performed .

According to this configuration, the heating system executes the first heating operation immediately after the operation of the heater is started. Since the temperature of the second heating medium is comparatively low immediately after the start of the heater, the second heating medium can be efficiently heated by the heat pump. On the other hand, since the heating capacity of the heat pump is lower than the heating capacity of the heating apparatus, the second heating medium can not be rapidly heated by the heat pump. However, in the first heating operation, the second heating medium can be heated by using the heat pump and the heating device in combination. Therefore, in the first heating operation, the second heat medium can be rapidly heated and the second heat medium can be efficiently heated. Therefore, the heater can be operated rapidly or can be operated with high output.

When the first heating operation is continuously executed, the temperature of the second heat medium circulating in the second heat medium circulation path rises. When the temperature of the second heat medium is raised, the heating efficiency of the second heat medium by the heat pump is lowered. According to the above arrangement, the heating system executes the second heating operation after executing the first heating operation. In the second heating operation, a part of the second heat medium circulating in the second heat medium circulation path passes through the second heat exchanger and the other part passes through the first bypass path. Therefore, when the second heating operation is started, the heating amount by the heat pump is reduced, so that the temperature rise of the second heat medium circulating through the second heat medium circulation path can be suppressed. In this case, the second heat medium can be efficiently heated again by the heat pump. Further, the second heating medium can be continuously heated by the heating device which is used in combination. That is why you can continue to operate the heater with high power.

When the second heating operation is continuously executed, the temperature of the second heat medium circulating in the second heat medium circulation path is raised again. As described above, when the temperature of the second heat medium is raised, the heating efficiency of the second heat medium by the heat pump is lowered. According to the above arrangement, the heating system executes the third heating operation after executing the second heating operation. In the third heating operation, the entire second heat medium circulating in the second heat medium circulation path is supplied to the first bypass path, and the second heat medium is heated by the heating device. In the third heating operation, the second heat medium is not heated by the heat pump. By performing the third heating operation, the second heating medium can be heated more rapidly to a high temperature. That is why you can continue to operate the heater with high power.

By continuously executing the third heating operation, the heater can be stably operated with high output. This state is also referred to as "state in which the radiator is activated ". According to the above arrangement, the heating system executes the fourth heating operation after executing the third heating operation. That is, the fourth heating operation can be executed after the heater is started. In the fourth heating operation, the second heat medium can be heated only by the heat pump. In this case, high-efficiency heating operation can be realized.

(Feature 3) It is preferable that the heating system further includes an outside temperature sensor for measuring the outside temperature. It is preferable that the heating system circulates the second heating medium and circulates the water in the tank water circulation path when the outside air temperature measured by the outside air temperature sensor is lower than the first predetermined temperature. According to this configuration, the heating system performs the freeze prevention operation when the outside air temperature is lower than the first predetermined temperature, and circulates the water in the second heating medium in the second heating medium circulation path and the tank water circulation path. As a result, the second heat medium and the water are frozen, and the second heat medium circulation passage and the tank water circulation passage are prevented from being damaged.

(4) The heating system includes a second bypass path connecting the upstream side and the downstream side of the first heat exchanger provided in the first heat medium circulation path, an open / close valve for opening / closing the second bypass path, It is preferable to further include an outside temperature sensor. The heating system preferably performs a defrosting operation for circulating the first heat medium in a state where the open / close valve is opened when the outside temperature measured by the outside temperature sensor is lower than the second predetermined temperature. According to this configuration, when the outside air temperature is lower than the second predetermined temperature, the heating system executes the defrosting operation and circulates the first heat medium without passing through the first heat exchanger. As a result, the temperature of the first heat medium in the first heat medium circulation path can be increased efficiently. Therefore, it is possible to prevent the frost from adhering to the first heat medium circulation path.

(Feature 5) The heating system includes a heat pump unit having a heat pump, a first heat exchanger and a case for housing the second heat exchanger, a heating device unit having a case for housing the heating device, And a tank unit including the tank unit. It is preferable that the tank water circulation passage is formed across the tank unit and the heat pump unit. And the second heat medium circulation path is formed so as to circulate the second heat medium in the order of the heating device unit, the tank unit, the heat pump unit, the tank unit, and the heating device unit. It is preferable that the first bypass path and the regulating valve are provided in a portion disposed in the case for the tank unit of the second heat medium circulation path. According to this configuration, since there is no need to provide a path for circulating the second heat medium between the heat pump unit and the heating device unit, the installation degree of each unit is improved. A heating system having excellent workability can be realized.

(6) The heating system has the heat pump unit, the heating device unit, and the tank unit. The tank water circulation path is formed across the tank unit and the heat pump unit. The second heat medium circulation path connects the second heat medium to the heating device The first bypass path and the regulating valve are preferably provided in a portion disposed in the case of the heat pump unit in the second heat medium circulation path. With such a configuration, it is not necessary to provide a path for circulating the second heating medium between the heating device unit and the tank unit, so that the degree of freedom of installation of each unit is improved. A heating system having excellent workability can be realized.

(Feature 7) The heat pump unit, the heating device unit, and the tank unit are formed, the tank water circulation path is formed over the tank unit and the heat pump unit, and the second heat medium circulation path is formed by connecting the second heat medium to the heating device unit, The pump unit, and the heating device unit, and the first bypass path and the adjustment valve are preferably provided in a portion disposed in the case of the heating unit of the second heating medium circulation path. Even in such a configuration, since there is no need to provide a path for circulating the second heat medium between the heating device unit and the tank unit, the degree of freedom of installation of each unit is improved. It is possible to realize an excellent heating system.

(Embodiment 1)

1, the hot water supply system 2 according to the present embodiment includes a hot water supply system 104, a heat pump system 106, a heating system 108, an ambient temperature sensor 40, and a controller (not shown) 100).

The heat pump system 106 includes a heat pump 50 and a three-fluid heat exchanger 58. The heat pump 50 includes a heating medium circulation path 52 for circulating a heating medium such as CO ₂ and the like, a heat exchanger (evaporator) 54, a fan 56, a compressor 62, an expansion valve 60, A heating medium bypass path 64, and an opening / closing valve 66. [ The heat medium circulation path (52) passes through the three-fluid heat exchanger (58). The heat exchanger 54, the fan 56, the compressor 62, and the expansion valve 60 are installed in the heat medium circulation path 52.

The heat exchanger 54 exchanges heat between the outside air blown by the fan 56 and the heat medium in the heat medium circulation path 52. As will be described later, the heat exchanger 54 is supplied with a low-pressure low-temperature liquid state heat medium after passing through the expansion valve 60. The heat exchanger (54) heats the heating medium by exchanging the heat medium with the outside air. The heating medium is vaporized by heating, and becomes a low-pressure gas state at a relatively high temperature.

The compressor 62 compresses the heat medium in the heat medium circulation path 52 and outputs it to the three-fluid heat exchanger 58 side. The heat medium that has passed through the heat exchanger (54) is supplied to the compressor (62). That is, the compressor 62 is supplied with the low-pressure gaseous heat medium at a relatively high temperature. The heat medium is compressed by the compressor 62, so that the heat medium becomes a gas state of high temperature and high pressure. The compressor (62) sends the compressed high-temperature, high-pressure gaseous heat medium to the three-fluid heat exchanger (58) side. The heat medium in the heat medium circulation path 52 circulates in the order of the heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, and the expansion valve 60 in this order.

The high-temperature, high-pressure gaseous heat medium sent out from the compressor 62 is supplied to the heat medium circulation path 52 of the three-fluid heat exchanger 58. 3 fluid heat exchanger 58 can perform heat exchange between the heating medium in the heating medium circulation path 52 and the water in the tank water circulation path 20 described later. The three-fluid heat exchanger (58) can perform heat exchange between the heating medium in the heating medium circulation path (52) and the water in the heat recovery path (88) described later. That is, the three-fluid heat exchanger 58 functions as a first heat exchanger that heats water in the tank water circuit 20 and a second heat exchanger that heats water in the heat recovery duct 88. The heat medium is condensed by removing heat as a result of heat exchange. As a result, the heating medium is in a liquid state at a relatively low temperature and a high pressure.

The expansion valve 60 is supplied with a relatively low-temperature, high-pressure liquid state heat medium that has passed through the three-fluid heat exchanger 58. The heating medium is decompressed by passing through the expansion valve 60, and becomes a low-temperature, low-pressure liquid state. The heating medium having passed through the expansion valve 60 is supplied to the heat exchanger 54 as described above.

One end of the heat medium bypass path 64 is connected to the upstream side of the three-fluid heat exchanger 58 in the heat medium circulation path 52 and the other end is connected to the downstream side of the expansion valve 60 in the heat medium circulation path 52 . That is, the heat medium bypass path 64 connects the upstream side and the downstream side of the three-fluid heat exchanger 58 and the expansion valve 60. An opening / closing valve 66 for opening / closing the heating medium bypass path 64 is provided in the heating medium bypass path 64.

Therefore, when the compressor 62 is operated while the open / close valve 66 is closed, the heat medium in the heat medium circulation path 52 does not flow through the heat medium bypass path 64 and flows through the heat exchanger 54, the compressors 62, The fluid heat exchanger 58, and the expansion valve 60 in this order. In this case, the water in the tank water circuit (20) or the water in the heat recovery path (88) is heated by the three fluid heat exchanger (58). On the other hand, when the compressor 62 is operated with the open / close valve 66 opened, the heat medium in the heat medium circulation path 52 is circulated in the order of the heat exchanger 54, the compressor 62 and the heat medium bypass path 64 , The three-fluid heat exchanger (58), and the expansion valve (60). In this case, the water in the tank water circuit (20) or the water in the heat recovery passage (88) is not heated in the three fluid heat exchanger (58).

The hot water supply system 104 includes a tank 10, a tank water circulation path 20, a water supply introduction path 24, a supply path 36, and a burner heating device 81.

The tank 10 stores hot water heated by the heat pump 50. The tank 10 is of a hermetically sealed type and is covered on the outside by a heat insulating material. Water is stored in the tank 10 until it becomes full. Thermistors 12, 14, 16 and 18 are provided in the tank 10 at substantially equal intervals in the height direction of the tank 10. [ Each thermistor 12, 14, 16, 18 measures the temperature of the water at its installation location.

The tank water circulation passage 20 has an upstream end connected to the lower portion of the tank 10 and a downstream end connected to the upper portion of the tank 10. A circulation pump 22 is interposed in the tank water circuit 20. The circulation pump 22 discharges the water in the tank water circuit 20 from the upstream side to the downstream side. As described above, the tank water circuit 20 passes through the three-fluid heat exchanger 58. Therefore, when the heat pump 50 is operated, the water in the tank water circuit 20 is heated in the three-fluid heat exchanger 58. Therefore, when the circulation pump 22 and the heat pump 50 are operated, the water in the lower part of the tank 10 is sent to the three-fluid heat exchanger 58 and heated, and the heated water is returned to the upper part of the tank 10 Loses. The tank water circuit (20) is a channel for accumulating heat in the tank (10).

An upstream end of the water introduction passage 24 is connected to the water supply source 32. The downstream side of the water-containing water introduction path 24 is branched into the first introduction path 24a and the second introduction path 24b. The downstream end of the first introduction passage 24a is connected to the lower portion of the tank 10. The downstream end of the second introduction path 24b is connected in the middle of the supply path 36. [ A check valve 26 is interposed in the first introduction passage 24a. A check valve 28 and a flow control valve 30 are interposed in the second introduction path 24b. The flow control valve 30 adjusts the flow rate of the water flowing in the second introduction path 24b.

The supply passage 36 has an upstream end connected to the upper portion of the tank 10. As described above, the second introduction passage 24b of the water-containing water introduction passage 24 is connected to the middle of the supply passage 36. [ A flow regulating valve 34 is interposed in the supply passage 36 on the upstream side of the connecting portion with the second introduction passage 24b. The flow rate adjusting valve 34 adjusts the flow rate of the water flowing in the supply path 36. A burner heating device 81 is interposed in the supply passage 36 on the downstream side of the connection portion with the second introduction passage 24b. The burner heating device 81 heats the water in the supply path 36. The downstream end of the supply path 36 is connected to the hot water supply 38.

The heating system 108 includes a cen- tern 70, a heating water circulation path 71, a burner heating device 82, and a heater 76. The heating water circulation path 71 is provided with a heating path 72, a heating return path 84, an adjustment valve 90, a heat recovery path 88, a heating bypass path 94, 96, respectively. The heating water circulation path 71 is a channel for circulating water in the cistern 70. [ The water in the heating water circulation path 71 is heated by the burner heating device 82 and the three-fluid heat exchanger 58.

The cistern (70) is a container having an open top, and stores water therein. The downstream end of the circulation flow path 96 and the upstream end of the heating forward path 72 are connected to the cen- ter 70. In the cistern 70, water flows in from the circulation flow path 96. Water in the cistern 70 is introduced into the heating path 72.

The heating conduit 72 has an upstream end connected to the cen- tern 70 and a downstream end connected to the supply port of the heater 76. [ A circulation pump 74 is interposed in the heating path 72. The circulation pump 74 delivers the water in the heating passageway 72 to the downstream side. A burner heating device 82 is interposed in the heating passage 72 on the upstream side of the heater 76. The burner heating device 82 heats the water in the heating railway 72. The manner in which the burner heating device 82 is operated is shown in FIGS. The burner heating device 82 has a higher ability to heat the water circulating in the heating water circulation path 71 than the heat pump 50. [ In other words, the burner heating device 82 has a higher heating amount per unit time than the heat pump 50. The heated water in the burner heating device 82 is supplied to the heater 76.

The radiator (76) heats the living room using the heat of water supplied from the heating radiator (72). When the water supplied from the heating railway 72 is used for heating, the heat is taken away and becomes relatively low temperature water. The relatively low-temperature water after being used for heating is introduced into the heating return passage 84.

The upper end of the heating return passage 84 is connected to the return port of the heater 76 and the lower end of the heating return passage 84 is connected to the upstream end of the heating bypass passage 94 and the upstream end of the heat recovery passage 88. A thermistor 86 is interposed in the heating return passage 84. The thermistor 86 measures the temperature of the water in the heating return 84.

The heat recovery furnace 88 has an upstream end connected to the upstream end of the heating bypass 94 and a downstream end of the heating return 84. The downstream end is connected to the downstream end of the heating bypass 94 and the circulation flow path 96, respectively. The heat recovery furnace 88 passes through the three-fluid heat exchanger 58. Therefore, when the heat pump 50 is operated, the water in the heat recovery furnace 88 is heated in the three-fluid heat exchanger 58. On the upstream side of the three-fluid heat exchanger (58) of the heat recovery furnace (88), a thermistor (92) is interposed. The thermistor 92 measures the temperature of the water in the heat recovery passage 88 before passing through the three-fluid heat exchanger 58.

The heating bypass path 94 is connected at its downstream end to the downstream end of the heating return path 84 and at the upstream end of the heat recovery path 88 and at its downstream end to the downstream end of the heat recovery path 88 and circulation path 96 As shown in Fig. That is, the heating bypass line 94 bypasses the upstream side and the downstream side of the three-fluid heat exchanger 58.

The adjustment valve 90 is provided at a connection portion between the downstream end of the heating return path 84 and the upstream end of the heat recovery path 88 and the upstream end of the heating bypass path 94. The adjustment valve 90 changes the flow rate of the water passing through the heat recovery path 94 (the flow rate of the water passing through the three-fluid heat exchanger 58) and the water passing through the heating bypass path 88 The ratio of the flow rate can be changed. For example, a three-way valve is used as the adjustment valve 90 of the present embodiment.

The upstream end of the circulation flow path 96 is connected to the downstream end of the heat recovery path 88 and the downstream end of the heating bypass path 94 and the downstream end thereof is connected to the cesset 70.

The outside temperature sensor (40) is provided near the tank (10) of the hot water supply system (104), and the outside temperature can be measured.

The control device 100 is electrically connected to the hot water supply system 104, the heat pump system 106, the heating system 108, and the ambient temperature sensor 40, and controls the operation of each component.

The hot water supply system 104, the heat pump system 106, the heating system 108, the ambient temperature sensor 40, and the control device 100 have been described above. In the present embodiment, however, the hot water supply heating system 2 including the above-described systems 104, 106 and 108 is constituted by the case 4a, 6a and 8a, and the tank unit 4, the heat pump unit 6, Unit 8 as shown in Fig. That is, the hot water heating system 2 of the present embodiment is formed by combining the tank unit 4, the heat pump unit 6, and the burner unit 8. In the present embodiment, the units 4, 6, and 8 are all installed outdoors.

The tank unit 4 includes a tank 10 of the hot water supply system 104, a part of the tank water circulation path 20 (including the circulation pump 22), a water supply introduction path 24, . The tank unit 4 includes a part of the heating return passage 84 of the heating system 108, a heating bypass passage 94, a part of the heat recovery passage 88, a part of the circulation flow passage 96, 90). The tank unit 4 also includes an outside air temperature sensor 40. The tank unit 4 accommodates the respective components in the case 4a.

The heat pump unit 6 includes the entire heat pump system 106 (i.e., the heat pump 50 and the three-fluid heat exchanger 58). The heat pump unit 6 also includes a part of the tank water circulation passage 20 passing through the three-fluid heat exchanger 58 and a part of the heat recovery passage 88. The heat pump unit 6 accommodates the respective components in a case 6a.

The burner unit 8 includes a cen- tern 70, a heating path 72 (including the circulation pump 74), a burner heating device 82, a part of the heating return 84, And a part of the circulating flow path 96. The burner unit 8 also includes a part of the supply path 36 of the hot water supply system 104 and the burner heating device 81. The burner unit 8 accommodates the respective components in a case 8a. Further, the body portion of the radiator 76 is disposed outside the case 8a (in the living room). In the case 8a, only the water supply port and the return port of the heater 76 are accommodated.

Thus, as described above, in this embodiment, the tank water circuit 20 is formed so as to extend across the tank unit 4 and the heat pump unit 6. The heating water circulation path 71 is formed across the tank unit 4, the heat pump unit 6 and the burner unit 8. [ The heating water circulation path 71 circulates water in the cistern 70 in the order of the burner unit 8, the tank unit 4, the heat pump unit 6, the tank unit 4, and the burner unit 8 Respectively. Therefore, in this embodiment, it is not necessary to provide a path for circulating water in the cistern 70 between the heat pump unit 6 and the burner unit 8. Therefore, the degree of freedom of installation of each unit 4, 6, 8 is improved. Therefore, a hot water heating system having excellent workability can be realized. In the present embodiment, the control device 100 is not included in any unit, but in a modification, the control device 100 may be included in any one unit.

(Operation of hot water heating system)

Next, the operation of the hot water heating system 2 of the present embodiment will be described. The hot water heating system 2 can perform heat storage operation, hot water supply operation, heating operation, freeze prevention operation, and defrost operation. Each operation will be described below.

(Heat storage operation)

The heat storage operation is an operation for heating the water in the tank 10 by the heat generated by the heat pump 50. A solid line arrow in Fig. 1 shows the flow of the heat medium in the heat pump 50 and the flow of water in the tank 10 during the heat accumulation operation. When execution of the heat accumulation operation is instructed by the controller 100, the heat pump 50 is operated and the circulation pump 22 is rotated. At this time, in the heat pump 50, the compressor 62 is operated with the open / close valve 66 closed.

The heat medium in the heat medium circulation path 52 flows through the heat exchanger 54, the compressor 62, the three-fluid heat exchanger 58, the expansion valve 60, and the expansion valve 60 by operating the heat pump 50 with the opening / closing valve 66 closed. . In this case, the heating medium in the heating medium circulation path 52 passing through the three-fluid heat exchanger 58 is in a gas state of high temperature and high pressure. When the circulation pump 22 rotates, the water in the tank 10 circulates in the tank water circulation passage 20. The water present in the lower portion of the tank 10 is introduced into the tank water circulation path 52 and heated by the heat of the heating medium in the heating medium circulation path 52 when the introduced water passes through the three fluid heat exchanger 58, The heated water is returned to the upper portion of the tank 10. Whereby hot water is stored in the tank (10). A layer of hot water is formed on the top of the tank 10 and a layer of low temperature water is formed on the bottom.

The controller 100 does not operate the heat pump 50 when the temperature detected by the outdoor temperature sensor 40 (i.e., the outdoor temperature) is lower than the predetermined threshold value T0 at the start of the heat accumulation operation, Do not run. The threshold value T0 is predetermined. In the present embodiment, the threshold value T0 is set to a temperature at which the heat pump 50 can not effectively absorb heat from the outside air even when the heat pump 50 is operated. The threshold value T0 is, for example, about 5 占 폚. Therefore, when the detected temperature of the outside air temperature sensor 40 is lower than the predetermined threshold value T0, the heat pump 50 can not efficiently heat the water. In this case, the control device 100 ends the heat accumulation operation without operating the heat pump 50. [

(Hot water operation)

The hot water supply operation is an operation for supplying water in the tank 10 to the hot water supply 38. A dashed arrow in Fig. 1 shows the flow of water in the tank 10 during the hot water supply operation. The hot water supply operation can be executed even during the heat storage operation. When the hot water supply passage 38 is opened, the control device 100 opens the flow rate adjusting valve 34. The tap water is introduced into the lower portion of the tank 10 from the tap water introduction path 24 (first introduction path 24a) by the water pressure from the tap water supply source 32. [ At the same time, the hot water in the upper part of the tank 10 is supplied to the hot water supply 38 through the supply path 36.

When the temperature of the water supplied from the tank 10 to the supply path 36 (i.e., the detected temperature of the thermistor 12) is higher than the hot water setting temperature, the control device 100 opens the flow adjustment valve 30, And the tap water is introduced into the supply path 36 from the path 24b. Therefore, the water supplied from the tank 10 and the water supplied from the second introduction path 24b are mixed in the supply path 36. The controller 100 adjusts the opening degree of the flow control valve 30 so that the temperature of the water supplied to the hot water supply 38 coincides with the hot water setting temperature. On the other hand, the control device 100 operates the burner heating device 81 when the temperature of the water supplied from the tank 10 to the supply path 36 is lower than the hot water setting temperature. Therefore, the water passing through the supply path 36 is heated by the burner heating device 81. [ The control device 100 controls the output of the burner heating device 81 such that the temperature of the water supplied to the hot water supply 38 matches the hot water setting temperature.

(Heating operation)

The heating operation is operation in which the radiator 76 is operated to heat the living room. Fig. 2 is a flowchart showing the processing executed by the control device 100 during the heating operation. Figs. 3 to 6 show the operation of each component during the first to fourth heating operations executed by the control device 100 according to the respective situations during the heating operation of Fig. Solid arrows in FIGS. 3 to 6 show the flow of the heating medium of the heat pump 50 and the flow of water in the water circulation path 71 for heating.

If the user instructs the execution of the heating operation, the control device 100 first determines whether or not the detected temperature (i.e., the outside temperature) of the outside air temperature sensor 40 is equal to or greater than the predetermined threshold value T1. The threshold value T1 is predetermined. In the present embodiment, the threshold value T1 is set to a temperature at which the heat pump 50 can not effectively absorb heat from the outside air even when the heat pump 50 is operated. The threshold value T1 is, for example, about 5 占 폚. If the detected temperature of the outdoor temperature sensor 40 is equal to or higher than the predetermined threshold value T1, the control device 100 determines YES in S10 and proceeds to S12. On the other hand, when the detected temperature of the outside air temperature sensor 40 is lower than the predetermined threshold value T1, the control device 100 determines NO at S10 and proceeds to S30.

In S12, the control device 100 executes the first heating operation. Fig. 3 shows the operation of each component during the first heating operation. That is, in S12, the control device 100 adjusts the opening degree of the adjustment valve 90 so that all of the water in the water heating water circulation path 71 passes through the three-fluid heat exchanger 58 (developed toward the heat recovery path 88 Fully opened), and the circulation pump 74 is rotated. Thus, all of the water introduced from the heating return passage (84) passes through the three-fluid heat exchanger (58). At the same time, the control device 100 operates the burner heating device 82. 3, the water in the cistern 70 flows from the cistern 70 through the heating path 72, the heater 76, the heating return path 84, the heat recovery path 88, And a path for returning to the cistern 70 through the circulating flow path 96 in this order is formed. At the same time, the controller 100 operates the heat pump 50 with the open / close valve 66 closed. As a result, the temperature of the heating medium in the heating medium circulation path 52 passing through the three-fluid heat exchanger 58 becomes high (see FIG. 3). Therefore, the water circulating through the path is heated by the burner heating device 82 when passing through the heating passageway 72 and is heated by the heating fluid in the three-fluid heat exchanger 58, Is heated by the heat of the heating medium in the circulation path (52). As a result, heated water is supplied to the heater 76 using both the burner heating device 82 and the heat pump 50. In step S12, the controller 100 activates the radiator 76. The radiator 76 heats the living room using the heat of the supplied water.

Since the timing at which the first heating operation is performed in S12 is immediately after the start of the heating operation, the temperature of water in each part in the heating water circulation path 71 is relatively low. Therefore, the difference between the temperature of the heating medium in the heating medium circulation path 52 passing through the three-fluid heat exchanger 58 and the temperature of water in the heat recovery duct 88 passing through the three-fluid heat exchanger 58 is relatively large. As described above, in the first heating operation, the heat pump 50 is operated and the opening degree of the adjustment valve 90 is adjusted so that all the water introduced from the heating return passage 84 passes through the heat recovery passage 88 do. Therefore, the water in the heat recovery furnace 88 can be efficiently heated by the heat pump 50.

On the other hand, since the heating capacity of the heat pump 50 is lower than that of the burner heating device 82, the water in the heating water circulation passage 71 can not be rapidly heated. However, in the first heating operation as described above, the burner heating device 82, which has a heating capability higher than that of the heat pump 50, heats the water passing through the heating passageway 72. Therefore, the water in the heating water circulation passage 71 can be rapidly heated. Therefore, by executing the first heating operation, water in the water heating water circulation passage 71 can be rapidly heated and efficiently heated. Therefore, the heater 76 can be rapidly activated or can be operated at a high output.

When S12 ends, in S14, the control device 100 monitors that the detected temperature of the thermistor 92 becomes equal to or higher than the predetermined threshold value T2. That is, in S14, the control device 100 monitors the temperature of the water before passing through the three-fluid heat exchanger 58 to be equal to or higher than the predetermined threshold value T2, which is the water after passing through the heater 76. [ The threshold value T2 is predetermined.

When the first heating operation of S12 is continuously executed, the temperature of the water in the heat recovery passage 88 passing through the three-fluid heat exchanger 58 is raised. When the temperature of water in the heat recovery passage 88 rises, the temperature of the heating medium in the heating medium circulation path 52 passing through the three-fluid heat exchanger 58 and the temperature of the heating medium in the heat recovery passage 88 passing through the three- The difference in the temperature of water is reduced, and the heating efficiency by the heat pump 50 is lowered.

Therefore, in the present embodiment, the threshold value T2 is set to a temperature at which the heat pump 50 can not efficiently heat water. The threshold value T2 is, for example, about 50 占 폚. If the detected temperature of the thermistor 92 is equal to or higher than the predetermined threshold value T2, the control device 100 determines YES in S14 and proceeds to S16.

In S16, the control device 100 executes the second heating operation. Fig. 4 shows the operation of each component during the second heating operation. The control device 100 continues the operations of the heat pump 50, the burner heating device 82 and the circulation pump 74 in the same manner as in the first heating operation in S16, And opens by a predetermined amount toward the bypass path 94 side. That is, the controller 100 controls the degree of opening of the regulating valve 90 such that a part of the water introduced from the heating return passage 84 passes through the three-fluid heat exchanger 58 and the other part passes through the heating bypass passage 94 . The amount by which the adjustment valve 90 is opened at one time in the process of S16 is predetermined. Thereby, the water introduced from the heating return path 84 is divided into the heat recovery path 88 and the heating bypass path 94 and flows. Thus, the amount of water heated by the heat pump 50 is reduced because the amount of water heated by the heat pump 50 is reduced. Therefore, the temperature rise of the water in the water heating water circulation passage 71 is suppressed. In this case, the water passing through the three-fluid heat exchanger (58) can be efficiently heated by the heat pump (50) again. Further, the burner heating device 82 may be continuously operated to heat the water passing through the heating passage 72. Therefore, the heater 76 can be continuously operated with high output.

The controller 100 determines that the degree of opening of the regulating valve 90 is lower than the state in which all the water in the heating water circulation path 71 passes through the heating bypass path 94 ) Side). If the degree of opening of the adjustment valve 90 is not the state in which all the water in the water heating water circulation passage 71 passes through the heating bypass passage 94, the control device 100 determines NO in S18 and returns to S14.

If NO in S18, the control device 100 monitors in S14 that the detected temperature of the thermistor 92 again becomes equal to or greater than the threshold value T2. Even in the case where the second heating operation is continuously executed, the temperature of the water in the heat recovery passage 88 passing through the three-fluid heat exchanger 58 is raised again. If the answer is YES in S14, the control device 100 further opens the adjusting valve 90 by a predetermined amount toward the heating bypass path 94 side. The control device 100 repeatedly executes the processes of S14 to S18 a predetermined number of times until it is determined YES in S18.

On the other hand, when the degree of opening of the adjustment valve 90 is in a state in which all the water in the water circulation path 71 for heating passes through the heating bypass path 94 (toward the heating bypass path 94) It is determined in step S18 that it is YSE, and the process advances to step S20.

In S20, the control device 100 executes the third heating operation. Fig. 5 shows the operation of each component during the third heating operation. At the time of S20, the opening degree of the regulating valve 90 is a state in which all the water in the heating water circulation passage 71 passes through the heating bypass passage 94 (toward the heating bypass passage 94). In S20, the control device 100 stops the heat pump 50. [ The control device 100 continues the operation of the burner heating device 82 and the circulation pump 74. Therefore, all of the water in the heating water circulation passage 71 is heated by the burner heating device 82 and is not heated by the heat pump 50. [ The water in the water heating water circulation path 71 can be heated more rapidly to a high temperature. Therefore, the heater 76 can be continuously operated with high output.

Upon completion of S20, in S22, the control device 100 monitors that the detected temperature of the thermistor 86 becomes equal to or higher than the predetermined threshold value T3. That is, in S22, the control device 100 monitors that the temperature of the water after passing through the heater 76 becomes equal to or higher than the predetermined threshold value T3. The threshold value T3 is predetermined.

When the third heating operation of S20 is continuously executed, the temperature of the water in the water heating water circulation passage 71 is raised. When the temperature of the water in the water heating water circulation path 71 is sufficiently raised, the heater 76 can be stably operated at a high output. This state is also referred to as "state in which the radiator 76 is activated ". It is not necessary to rapidly heat the water in the water heating water circulation path 71 by the burner heating device 82 when the heater 76 is fully activated.

Therefore, in the present embodiment, the threshold value T3 is set to a temperature at which the temperature of the water in the water heating water circulation passage 71 can be judged to be sufficiently high. The threshold value T3 is, for example, about 65 占 폚. When the detected temperature of the thermistor 86 is equal to or higher than the predetermined threshold value T3, the control device 100 determines YES in S22 and proceeds to S24.

In S24, the control device 100 stops the burner heating device 82. [ The control device 100 continues to rotate the circulation pump 74. [ As a result, the water in the heating water circulation passage 71 is no longer heated. The heater 76 is supplied with the heat of water in the heating water circulation path 71 heated to the temperature equal to or higher than the threshold value T3.

When S24 ends, the control device 100 monitors that the detected temperature of the thermistor 86 becomes equal to or higher than the predetermined threshold value T4 in S26. That is, in S26, the control device 100 monitors that the temperature of the water after passing through the heater 76 becomes equal to or higher than the predetermined threshold value T4. The threshold value T4 is predetermined.

When the circulation pump 74 is continuously rotated in the state where the burner heating device 82 is stopped in S24, the temperature of the water in the water heating circulation path 71 is lowered. In the present embodiment, the threshold value T4 is set to a temperature at which the water in the water heating water circulation path 71 can be heated efficiently by the heat pump 50 again. An example of the threshold value T4 is about 45 캜. When the detected temperature of the thermistor 86 is equal to or higher than the predetermined threshold value T4, the control device 100 determines YES in S26 and proceeds to S28.

In S28, the control device 100 executes the fourth heating operation. Fig. 6 shows the operation of each component in the fourth heating operation. In S28, the control device 100 operates the heat pump 50 again and opens the adjustment valve 90 to the three-fluid heat exchanger 58 side by a predetermined amount. That is, the controller 100 controls the degree of opening of the regulating valve 90 such that a part of the water in the water heating water circulation passage 71 passes through the three-fluid heat exchanger 58 and the other part passes through the heating bypass passage 94 . The amount by which the adjustment valve 90 is opened is predetermined. As a result, the water introduced from the heating return passage 84 is divided into the heat recovery passage 88 and the heating bypass passage 94 and passes. As a result, the water in the water circulation path 71 for heating is raised because a part of the water is heated by the heat pump 50. In the fourth heating operation, the water in the heating water circulation path (71) can be heated only by the heat pump (50). In this case, high-efficiency heating operation can be realized.

When the fourth heating operation is started in S28, the controller 100 continues the fourth heating operation until the user instructs the end of the heating operation. The control device 100 continues the fourth heating operation while adjusting the opening degree of the regulating valve 90 in accordance with the detected temperature of the thermistor 92. [

On the other hand, when the detection temperature of the outdoor temperature sensor 40 is lower than the predetermined threshold value T1 (NO at S10) when the user instructs execution of the heating operation, at S30, The same operation as the heating operation is performed. The control device 100 adjusts the degree of opening of the adjustment valve 90 so that all of the water in the water heating water circulation path 71 passes through the heating bypass path 94 (toward the heating bypass path 94) , The circulation pump 74 is rotated. Further, the control device 100 does not operate the heat pump 50 but operates the burner heating device 82 alone. Thereby, the water in the water heating water circulation passage 71 is heated only by the burner heating device 82. As a result, heated water is supplied to the heater 76 using the burner heater 82. The control device 100 operates the heater 76. The radiator 76 heats the living room using the heat of the supplied water.

As described above, when the detected temperature of the outside air temperature sensor 40 is lower than the predetermined threshold value T1 (NO in S10), the heat pump 50 can not efficiently heat the water. In such a case, the heater 76 can be rapidly activated and the heater 76 can be operated with high output even when the outside air temperature is low by executing the operation of S30. When the operation of S30 is started, the control device 100 continues the operation of S30 until the user instructs the end of the heating operation.

(Freezing prevention operation)

The freeze prevention operation is an operation for preventing the water in the water tank circulation path 20 and the water in the water circulation path 71 for heating from freezing in a state where the outside air temperature is low and freezing the piping from breakage. Fig. 7 shows the operation of each component during freeze prevention operation.

The control device 100 periodically performs the freeze prevention operation when the temperature (outside temperature) detected by the outside temperature sensor 40 is lower than the predetermined threshold value T5. The predetermined threshold value T5 is, for example, 0 占 폚. When the control device 100 starts the freezing prevention operation, as shown in Fig. 7, the circulation pump 22 is rotated to circulate the water in the tank water circuit 20. At the same time, the control device 100 rotates the circulation pump 74 to circulate water in the water circulation path 71 for heating. The opening degree of the adjustment valve 90 at this time is adjusted so that all the water in the water circulation path 71 for heating passes through the three-fluid heat exchanger 58 in the example of Fig. 7 (developed toward the heat recovery path 88) . The opening degree of the regulating valve 90 can be adjusted even if a part of the water in the water heating water circulation passage 71 passes through the three-fluid heat exchanger 58 and the other part passes through the heating bypass passage 94 do. Further, in the freeze prevention operation, the control device 100 may operate the burner heating device 82 in accordance with the outside air temperature. In this embodiment, by performing the freeze prevention operation periodically, it is possible to prevent the water in the water tank circulation path 20 and the water in the water heating water circulation path 71 from freezing, and the piping can be prevented from freezing.

(Defrost operation)

The defrosting operation is an operation for removing the frost attached to the heat exchanger (54) of the heat pump (50) in a state where the outside air temperature is low. The heat exchanger (54) of the heat pump (50) performs heat exchange between the outside air and the heat medium to heat the heat medium. Therefore, the temperature of the heat exchanger (54) tends to be lowered in a situation where the outside air temperature is low, so that the frost easily attaches to the surface of the heat exchanger (54).

The controller 100 periodically performs the defrosting operation when the temperature (outside temperature) detected by the outside air temperature sensor 40 becomes lower than the predetermined threshold value T6. The predetermined threshold value T6 is, for example, 0 deg. When the controller 100 starts defrosting operation, the controller 62 opens the on-off valve 66 as shown in Fig. That is, when the compressor 62 is operated with the open / close valve 66 opened, the heat medium in the heat medium circulation path 52 is circulated in the order of the heat exchanger 54, the compressor 62 and the heat medium bypass path 64, 3 fluid heat exchanger 58 and the expansion valve 60, respectively. In this case, since the heating medium in the heating medium circulation path 52 passes through the three-fluid heat exchanger 58 and the expansion valve 60 and the temperature is not lowered, the heating medium circulates in a state of high temperature and high pressure. As a result, the temperature of the heat medium passing through the heat exchanger 54 is increased, and the frost attached to the surface of the heat exchanger 54 can be removed.

The configuration and operation of the hot water heating system 2 of the present embodiment have been described above. As described above, in the hot water heating system 2 of the present embodiment, by changing the opening degree of the regulating valve 90, the flow rate of the water passing through the three-fluid heat exchanger 58 and the flow rate of the water passing through the heating bypass path 94 The ratio of the flow rate can be changed. Therefore, in this hot water heating system 2, for example, a situation in which the water in the water heating water circulation passage 71 needs to be heated in the three-fluid heat exchanger 58 by adjusting the opening degree of the adjustment valve 90, A situation in which only a part of the water in the water heating water circulation path 71 is to be heated in the heating water circulation path 58 in the heating water circulation path 71, a situation in which the water in the heating water circulation path 71 is not heated in the three- The flow rate of the water in the heating water circulation passage 71 passing through the unit 58 can be appropriately changed.

The hot water heating system 2 of this embodiment is an example of a "heating system ". The heating medium circulation path 52 and the heating water circulation path 71 are examples of the "first heating medium circulation path" and the "second heating medium circulation path", respectively. 3 fluid heat exchanger 58 is an example of the "first heat exchanger" and the "second heat exchanger". The heating bypass path 94 and the heating medium bypass path 64 are examples of "first bypass path" and "second bypass path ", respectively. The temperature of the threshold value T5 and the temperature of the threshold value T6 are examples of the "first predetermined temperature" and the "second predetermined temperature", respectively.

(Second Embodiment)

The difference between the second embodiment and the first embodiment will be described. 9, in this embodiment, the tank unit 4 includes a tank 10 of the hot water supply system 104, a part of the tank water circulation path 20 (including the circulation pump 22) A part of the introduction path 24, and a part of the supply path 36. [ The tank unit 4 also includes an outside air temperature sensor 40. The tank unit 4 accommodates the respective components in the case 4a.

The heat pump unit 6 includes the entire heat pump system 106 (i.e., the heat pump 50 and the three-fluid heat exchanger 58). The heat pump unit 6 also includes a part of the tank water circulation passage 20 passing through the three-fluid heat exchanger 58, a part of the heating return passage 84, a heating bypass passage 94, a heat recovery passage 88, A portion of the circulation flow path 96, and an adjustment valve 90. The heat pump unit 6 accommodates the respective components in a case 6a.

The burner unit 8 includes a cen- tern 70, a heating path 72 (including the circulation pump 74), a burner heating device 82, a part of the heating return 84, And a part of the circulating flow path 96. The burner unit 8 includes a part of the supply path 36 of the hot water supply system 104 and the burner heating device 81. The burner unit 8 accommodates the respective components in a case 8a.

As described above, in this embodiment, the tank water circulation passage 20 is formed across the tank unit 4 and the heat pump unit 6. [ The heating water circulation path 71 is formed so as to extend over the heat pump unit 6 and the burner unit 8. The heating water circulation path 71 is formed to circulate water in the cistern 70 in the order of the burner unit 8, the heat pump unit 6 and the burner unit 8. [ Therefore, in this embodiment, it is not necessary to provide a path for circulating water in the cistern 70 between the tank unit 4 and the burner unit 8. [ Therefore, the degree of freedom of installation of each unit 4, 6, 8 is improved. Therefore, a hot water heating system having excellent workability can be realized.

(Third Embodiment)

The third embodiment is different from the first embodiment. 10, in this embodiment, the tank unit 4 includes a tank of the hot water supply system 104, a part of the tank water circulation path 20 (including the circulation pump 22) 24, and a portion of the supply path 36. [0035] The tank unit 4 also includes an outside air temperature sensor 40. The tank unit 4 accommodates the respective components in the case 4a.

The heat pump unit 6 includes the entire heat pump system 106 (i.e., the heat pump 50 and the three-fluid heat exchanger 58). The heat pump unit 6 also includes a part of the tank water circulation passage 20 passing through the three-fluid heat exchanger 58, a part of the heating return passage 84, and a part of the heat recovery passage 88. The heat pump unit 6 accommodates the respective components in a case 6a.

The burner unit 8 includes a cen- tern 70, a heating path 72 (including a circulating pump 74), a burner heating device 82, a heating return path 84, A portion of the heat recovery passage 88, a circulation flow passage 96, and a regulating valve 90. As shown in Fig. The burner unit 8 includes a part of the supply path 36 of the hot water supply system 104 and the burner heating device 81.

As described above, in this embodiment, the tank water circulation passage 20 is formed across the tank unit 4 and the heat pump unit 6. [ The heating water circulation path 71 is formed so as to extend over the heat pump unit 6 and the burner unit 8. The heating water circulation path 71 is formed so as to circulate the water in the cistern 70 in the order of the burner unit 8, the heat pump unit 6, and the burner unit 8 in this embodiment. Therefore, in this embodiment, it is not necessary to provide a path for circulating water in the cistern 70 between the tank unit 4 and the burner unit 8. [ Therefore, the degree of freedom of installation of each unit 4, 6, 8 is improved. Therefore, a hot water heating system having excellent workability can be realized.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to these embodiments. The techniques described in the claims include various modifications and changes to the embodiments described above.

(Modification 1) In the above embodiment, the adjustment valve 90 is provided at the connection portion between the downstream end of the heating return passage 84, the upstream end of the heat recovery passage 88, and the upstream end of the heating bypass passage 94 have. A three-way valve is used for the adjustment valve 90. Instead of the adjustment valve 90, a flow regulating valve may be provided in the heating bypass passage 94.

(Alternative Example 2) In the above embodiment, the three-fluid heat exchanger 58 functions as a first heat exchanger for heating water in the tank water circulation passage 20 and a second heat exchanger for heating water in the heat recovery duct 88 do. Instead, the first heat exchanger for heating water in the tank water circuit 20 and the second heat exchanger for heating the water in the heat recovery duct 88 may be configured as separate heat exchangers.

(Variation 3) In the above embodiment, the threshold values T0 and T1 are set to such a temperature that the heat pump 50 can not effectively absorb heat from the outside air even when the heat pump 50 is operated. Alternatively, the threshold values T0 and T1 may be set to a temperature at which the components (such as the compressor 62, etc.) of the heat pump 50 fail to operate (for example, about -10 DEG C) when the heat pump 50 is operated You can also set it.

2: Hot water heating system 4: Tank unit
4a: Case 6: Heat pump unit
6a: Case 8: Burner Unit
8a: Case 10: tank
12, 14, 16, 18: Thermistor 20: Tank water circuit
22: Circulation pump 24: Water supply introduction path
24a: first introduction route 24b: second introduction route
26: check valve 28: check valve
30: Flow control valve 32: Water supply source
34: Flow control valve 36: Supply path
38: Hot water supply 40: Outside temperature sensor
50: heat pump 52: heat medium circulation path
54: heat exchanger 56: fan
58: 3 fluid heat exchanger 60: expansion valve
62: compressor 64: heat medium bypassed
66: opening / closing valve 70:
71: Heating water circulation path 72:
74: circulation pump 76: radiator
81: Burner heating device 82: Burner heating device
84: Heating return 86: Thermistor
88: Heat recovery furnace 90: Regulating valve
92: Thermistor 94: Bypass for heating
96: Circulating flow path 100: Control device
104: Hot water supply system 106: Heat pump system
108: Heating system

Claims (8)

As a heating system,
A heat pump having a first heat medium circulation path for circulating the first heat medium,
A tank for storing water to be supplied to the hot water use portion,
A tank water circuit for introducing water in the tank and returning the introduced water to the tank,
A first heat exchanger for heating water in the tank water circulation path by heat exchange with the first heat medium,
A second heat medium circulation path for circulating the second heat medium,
A second heat exchanger for heating the second heat medium by heat exchange with the first heat medium,
A heating device that has a higher heating capability than the heat pump and heats the second heat medium,
A heater for heating by using the heat of the second heat medium,
A first bypass provided in the second heat medium circulation passage for connecting the upstream side and the downstream side of the second heat exchanger,
And a regulating valve which is provided in the first bypass passage and changes the ratio of the flow rate of the second heat medium passing through the second heat exchanger to the flow rate of the second heat medium passing through the first bypass passage by changing the opening degree,
The degree of opening of the regulating valve is controlled so that all of the second heat medium circulating in the second heat medium circulation passage passes through the second heat exchanger and the first heat medium is heated by the heat pump and the heating device, Driving,
The degree of opening of the regulating valve is controlled by a heat pump and a heating device in a state in which a part of the second heat medium circulating in the second heat medium circulation path passes through the second heat exchanger and the other part passes through the first bypass path A second heating operation for heating the second heating medium to operate the heater,
The third heating operation for operating the heater by heating the second heating medium by the heating device in a state in which the opening degree of the adjustment valve is adjusted so that all of the second heating medium circulating in the second heating medium circulation path passes through the first bypass path and,
The fourth heating operation for operating the heater by heating the second heating medium by the heat pump while adjusting the opening degree of the adjustment valve such that at least a part of the second heating medium circulating in the second heating medium circulation path passes through the second heat exchanger Is capable of executing the heating system.
delete The method according to claim 1,
Immediately after the start of operation of the radiator, the first heating operation is executed,
Then, the second heating operation is performed,
Thereafter, the third heating operation is performed,
And then the fourth heating operation is performed.
The method according to claim 1,
An outdoor temperature sensor for measuring an outdoor temperature,
And the second heating medium is circulated when the outside air temperature measured by the outside air temperature sensor is lower than the first predetermined temperature, and at the same time, the water in the tank water circulation path is circulated.
The method according to claim 1,
A second bypass path connecting the upstream side and the downstream side of the first heat exchanger provided in the first heat medium circulation path,
An on-off valve for opening / closing the second bypass passage,
An outdoor temperature sensor for measuring an outdoor temperature,
And when the outdoor temperature measured by the outdoor temperature sensor is lower than the second predetermined temperature, performs a defrosting operation for circulating the first heat medium in a state in which the open / close valve is opened.
The method of claim 1, claim 3, claim 4 or claim 5,
The heating system
A heat pump unit having a case for a heat pump unit that houses a heat pump, a first heat exchanger and a second heat exchanger;
A heating device unit having a case for a heating device accommodating the heating device;
And a tank unit having a case for a tank unit for containing the tank,
The tank water circulation passage is formed across the tank unit and the heat pump unit,
The second heat medium circulation path is formed so as to circulate the second heat medium in the order of the heating device unit, the tank unit, the heat pump unit, the tank unit, and the heating device unit,
Wherein the first bypass path and the regulating valve are provided in a portion of the second heat medium circulation path disposed in the case for the tank unit.
The method of claim 1, claim 3, claim 4 or claim 5,
The heating system
A heat pump unit having a case for a heat pump unit that houses a heat pump, a first heat exchanger and a second heat exchanger;
A heating device unit having a case for a heating device accommodating the heating device;
And a tank unit having a case for a tank unit for containing the tank,
The tank water circulation passage is formed across the tank unit and the heat pump unit,
The second heat medium circulation path is formed so as to circulate the second heat medium in the order of the heating device unit, the heat pump unit, and the heating device unit,
Wherein the first bypass path and the regulating valve are provided in a portion of the second heat medium circulation path disposed in the case for the heat pump unit.
The method of claim 1, claim 3, claim 4 or claim 5,
The heating system
A heat pump unit having a case for a heat pump unit that houses a heat pump, a first heat exchanger and a second heat exchanger;
A heating device unit including a case for a heating device unit which houses the heating device;
And a tank unit having a case for a tank unit for containing the tank,
The tank water circulation passage is formed across the tank unit and the heat pump unit,
The second heat medium circulation path is formed so as to circulate the second heat medium in the order of the heating device unit, the heat pump unit, and the heating device unit,
Wherein the first bypass path and the regulating valve are provided at a portion disposed in the case of the heating unit unit of the second heating medium circulation path.

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