JP5161628B2 - Hot water system - Google Patents

Hot water system Download PDF

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JP5161628B2
JP5161628B2 JP2008087967A JP2008087967A JP5161628B2 JP 5161628 B2 JP5161628 B2 JP 5161628B2 JP 2008087967 A JP2008087967 A JP 2008087967A JP 2008087967 A JP2008087967 A JP 2008087967A JP 5161628 B2 JP5161628 B2 JP 5161628B2
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hot water
temperature
storage tank
water
supplied
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JP2009243713A (en
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明夫 森田
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株式会社日本サーモエナー
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  The present invention relates to a hot water supply system configured to be able to supply hot water from a hot water storage tank to a hot water supply load, and more particularly, to a hot water supply system including a plurality of heat source units.
  The hot water supply system is configured to store hot water heated by a heat source device in a hot water storage tank and supply hot water from the hot water storage tank to a hot water supply load. 2. Description of the Related Art Conventionally, there are heat source machines that use a hot water boiler that uses gas or the like as a heat source and those that use a heat pump water heater that heats water by exchanging heat with condensation heat from a condenser of a heat pump circuit.
  The heat pump water heater uses cheap electricity at night to store hot water in the hot water storage tank during the time when it is in a low hot water supply load state where the amount of hot water consumption is low at night. Generally used for hot water supply such as showers.
  However, since the heating capacity of the heat pump water heater is determined assuming a low hot water supply load at night, it is only necessary to heat to a predetermined temperature for the purpose of hot water storage, and the heating capacity in a short time is very low. Therefore, when the hot water in the hot water storage tank is consumed at the time of high hot water supply load, the hot water supply capacity may be insufficient. Also, while heat is stored at night, hot water is used in the daytime and evening of the following day, so the usage time is greatly shifted, heat dissipation from the hot water storage tank increases, and heat stored with high efficiency is dissipated with great effort. The problem arises.
  As a method of making up for the lack of heating capacity of such a heat pump water heater and ensuring the required hot water supply capacity of the heat pump water heater, the present applicant has conventionally disclosed a hot water supply system using both a heat pump water heater and a hot water boiler ( See Patent Document 1 below). Hereinafter, the configuration disclosed in Patent Document 1 will be described with reference to the drawings.
  FIG. 4 is a schematic configuration diagram of the hot water supply system disclosed in Patent Document 1. A hot water supply system 100 shown in FIG. 4 includes a hot water storage tank 1, a heat pump water heater 2, a hot water boiler 3, a hot water supply load 4, and a water supply source 5.
From the water supply source 5, low temperature water can be supplied from the water inlet / outlet 31 to the hot water storage tank 1 via the valve 11 and the three-way joint 41. Furthermore, low temperature water can be supplied from the water supply source 5 to the heat pump water heater 2 through the valve 11, the three-way joint 41, the valve 12, the circulation pump 13, and the valve 14. The heat pump water heater 2 is constituted by a CO 2 heat pump adopting, for example, CO 2 as a refrigerant of the heat pump circuit, and heat treatment is performed by exchanging heat with the condensed heat from the condenser for the supplied low temperature water (or hot water). The heated and heated water is supplied from the water inlet 33 to the hot water storage tank 1 through the check valve 15, the three-way joint 42 and the valve 16. The water inlet 33 is formed above the water inlet / outlet 31 in the hot water storage tank 1.
  Further, the hot water stored in the hot water storage tank 1 can be supplied to the hot water boiler 3 from the water outlet 32 via the check valve 17, the circulation pump 24 and the valve 18. The hot water boiler 3 is composed of, for example, a gas-fired vacuum hot water machine, provided with a furnace that heats the heat transfer water with a flame of a gas burner at the lower part of the can body, and U-shaped transmission into the decompressed air at the upper part of the can body. A heat pipe is provided, and the heat transfer water sealed in the lower part of the can body is heated by a flame of a gas burner, and the water flowing in the heat transfer pipe is heated by heating the heat transfer pipe in the decompressed air at the upper part. The hot water boiler 3 heats the supplied hot water by the boiler, and then supplies the hot water from the water inlet 33 to the hot water storage tank 1 through the valve 19, the three-way joint 42, and the valve 16. That is, hot water obtained from the water outlet 32 of the hot water storage tank 1 is supplied to the hot water boiler 3 via the circulation pump 24, heated by the hot water boiler 3, and then resupplied from the water inlet 33 to the hot water storage tank 1. Circuit circuit (hereinafter referred to as “first circulation circuit C1”).
  Furthermore, the hot water stored in the hot water storage tank 1 is supplied to the heat pump water heater 2 through the three-way joint 41, the valve 12, the circulation pump 13, and the valve 14 from the water inlet / outlet 31 and is configured to be reheatable. As described above, the hot water heated by the heat pump water heater 2 is supplied from the water inlet 33 to the hot water storage tank 1 and stored therein. That is, the hot water obtained from the inlet / outlet 31 of the hot water storage tank 1 is supplied to the heat pump water heater 2 through the circulation pump 13, heated by the heat pump hot water heater 2, and then returned to the hot water storage tank 1 from the inlet 33. A circulation circuit to be supplied (hereinafter referred to as “second circulation circuit C2”) is configured. FIG. 5 shows a path diagram of the first circulation circuit C1 and the second circulation circuit C2. In FIG. 5, illustration of some components such as valves and joints is omitted.
  Further, in the second circulation circuit C2, the hot water taken out from the inlet / outlet 31 by operating the pump 13 is all sent to the heat pump water heater 2 side.
  The hot water stored in the hot water storage tank 1 is supplied from the water outlet 34 of the hot water storage tank 1 to the hot water supply load 4 via the valve 21. The hot water supply load 4 is composed of a currant, a shower, a bathtub, or the like, for example. Since water has a property of moving upward as the temperature increases, so-called convection, hot water having a high temperature is stored in the upper region of the hot water storage tank 1. Therefore, hot hot water can be supplied to the hot water supply load 4 from the water outlet 34 provided in the upper region of the hot water storage tank 1. A part of the hot water is circulated from the water inlet 35 to the hot water storage tank 1 via the circulation pump 23 and the valve 22 in order to prevent a decrease in the temperature of the hot water due to heat radiation in the pipe.
  The hot water storage tank 1 is provided with a temperature sensor 51 for detecting the temperature of the hot water stored in the upper part of the tank and a temperature sensor 52 for detecting the temperature of the hot water stored in the lower part of the tank. As described above, the low temperature water supplied from the water supply source 5 flows into the tank 1 from the inlet / outlet 31 attached to the lower part of the hot water storage tank 1, and the hot water heated by the heat pump water heater 2 or the hot water boiler 3 is stored in the hot water. It is configured to flow into the tank 1 from a water inlet 33 attached to the upper part of the tank 1. For this reason, the temperature sensor 51 attached to the upper part of the tank detects a higher temperature than the temperature sensor 52 attached to the lower part of the tank.
  The hot water boiler 3 and the circulation pump 24 are controlled based on the detection result of the temperature sensor 51, while the heat pump water heater 2 and the circulation pump 13 are controlled based on the detection result of the temperature sensor 52. More specifically, for example, if the temperature information given from the temperature sensor 51 is 50 ° C. or more, the hot water boiler 3 and the circulation pump 24 are stopped, and if it is 35 ° C. or less, the hot water boiler 3 and the circulation pump 24 are operated. . Further, for example, if the temperature information given from the temperature sensor 52 is 50 ° C. or higher, the heat pump water heater 2 and the circulation pump 13 are stopped, while if it is 35 ° C. or lower, the heat pump water heater 2 and the circulation pump 13 are operated.
  As described above, since the temperature of the temperature sensor 51 is detected higher than that of the temperature sensor 52, when the low temperature water is supplied from the water supply source 5 into the hot water storage tank 1 and the temperature in the tank starts to decrease, The sensor 52 first detects 35 ° C. or less, whereby the heat pump water heater 2 is operated earlier than the hot water boiler 3. On the other hand, when the temperature in the tank begins to rise due to the supply of heated hot water, the temperature sensor 51 first detects 50 ° C. or higher, whereby the hot water boiler 3 precedes the heat pump water heater 2. To be stopped. Thus, by setting it as the structure of FIG. 4, the control which operates the heat pump water heater 2 preferentially rather than the hot water boiler 3 will be performed. As described above, since the heat pump water heater 2 is configured to achieve higher efficiency by itself than the hot water boiler 3, the operating efficiency of the high efficiency heat pump water heater 2 is improved, so that the efficiency of the entire system is increased. Can be realized.
JP 2007-170770 A
  However, in the case of the configuration of FIG. 4, it is necessary to attach two temperature sensors 51 and 52 in the hot water storage tank 1. Normally, in the conventional hot water storage tank 1 manufactured assuming only heating by the hot water boiler 3, the temperature sensor 51 for controlling the hot water boiler 3 is already attached, but for controlling the heat pump water heater 2. The temperature sensor 52 is not attached.
  Therefore, in order to apply such a hot water storage tank 1 to the hot water supply system 100 shown in FIG. 4, it is necessary to newly attach a temperature sensor 52, but such a temperature sensor 52 is newly attached to the hot water storage tank 1. Therefore, it is difficult to newly install such a temperature sensor 52.
  As another method, a hole for attaching the temperature sensor 52 to the hot water storage tank 1 can be formed and the temperature sensor 52 can be installed in this hole. There may be a case where water leakage occurs. In such a case, even when no hot water supply load is generated, the amount of hot water stored in the tank 1 is reduced, which requires additional water supply from the water supply source and heating by the hot water boiler 3 or the heat pump water heater 2. There is a possibility that the efficiency of the entire system is lowered.
  In view of the above problems, the present invention provides a hot water supply system that enables control of a single heat source device without newly attaching a temperature sensor directly to a hot water storage tank in a hot water supply system having a plurality of heat source devices. With the goal.
  In order to achieve the above object, a hot water supply system according to the present invention includes a first heat source machine and a second heat source machine for heating supplied hot water, hot water storage for storing hot water and supplying the stored hot water to a hot water supply load. A first circulation circuit in which hot water obtained from a tank and a water outlet provided at a lower part of the hot water storage tank is re-supplied to the hot water storage tank via the first heat source unit; and a lower part of the hot water storage tank. A second circulation circuit in which the hot water obtained from the inlet / outlet is directly re-supplied to the hot water storage tank directly through the second heat source unit or through the first heat source unit; and the second circulation circuit. A cross joint having first to fourth openings in four directions interposed between the water inlet / outlet and the second heat source unit, and a flow path inside the cross joint from the first opening. Inserted to reach the front A temperature sensor capable of measuring the temperature of hot water flowing through the flow path inside the cross joint, connected to a water supply source for supplying low-temperature water to the second opening, and connected to the third opening By connecting a second heat source machine and connecting the water inlet / outlet to the fourth opening, the low-temperature water supplied from the water supply source is branched by the cross joint so that the inside of the hot water storage tank and the second It is comprised so that supply to a heat source machine is possible, and it is the 1st characteristic that the said 2nd heat source machine performs start / stop control according to the temperature detected by the said temperature sensor.
  According to the first characteristic configuration of the hot water supply system according to the present invention, the start / stop control of the second heat source machine is performed according to the temperature of the hot water passing through the interior of the cross joint.
  Here, the low temperature water is not supplied from the water supply source, and the hot water is not passing through the second circulation circuit, that is, the hot water is acquired from the inlet / outlet of the hot water storage tank, and the second heat source machine. If hot water is not flowing through the circulation circuit in which hot water is re-supplied to the hot water storage tank after being heated in step 2, the path from the inlet / outlet to the second heat source unit in the second circulation circuit Hot water will stay. The temperature of the hot water that remains is about the same as that of the hot water in the hot water storage tank near the water inlet / outlet. A cross joint is interposed in the path from the inlet / outlet port to the second heat source machine in the second circulation circuit, and the temperature sensor can detect the temperature of the hot water passing through the cross joint. Therefore, the temperature of the hot water detected by the temperature sensor is substantially equal to the temperature of the hot water stored in the lower part of the hot water storage tank.
  Moreover, low temperature water is not supplied from the water supply source, and hot water is passing through the second circulation circuit, that is, hot water is acquired from the inlet / outlet of the hot water storage tank, and the second heat source machine When hot water is flowing through a circulation circuit in which hot water is re-supplied to the hot water storage tank after being heated, the hot water stored in the hot water storage tank is taken out from the water inlet / outlet, and the second water is passed through the cross joint. Hot water is supplied to the heat source machine. In other words, in such a case, the hot water in the hot water storage tank near the water inlet / outlet and the hot water passing through the cross joint show substantially the same temperature. For this reason, even in such a case, the temperature sensor detects the temperature of the hot water flowing through the cross joint, which is substantially equivalent to detecting the temperature of the hot water stored in the lower part of the hot water storage tank.
  In other words, when the low temperature water is not supplied from the water supply source, the temperature of the hot water passing through the cross joint is detected by the temperature sensor, so that the temperature of the hot water stored in the lower part of the hot water storage tank is substantially detected. The result is equal to Therefore, by controlling the second heat source unit based on the detection result of the temperature sensor, start / stop control can be performed based on the temperature of the hot water substantially stored in the lower part of the hot water storage tank.
  Further, when low temperature water is supplied from a water supply source, low temperature water passes through the cross joint. In such a case, the temperature sensor detects a temperature equal to or lower than the temperature of the hot water stored in the lower part of the hot water storage tank. Thereby, it can recognize that the temperature of the hot water in a hot water storage tank is falling. Therefore, for example, by setting in advance to perform control for operating the second heat source machine when the detected temperature is equal to or lower than a predetermined temperature, the hot water substantially stored in the lower part of the hot water storage tank is set. It is possible to perform start / stop control based on temperature.
  And when implement | achieving the structure of this invention, it can implement | achieve only by inserting a temperature sensor in one hole using a commercially available cross joint. For this reason, even when adding a new heat source device to a conventional hot water storage tank that assumes only one heat source device, it is necessary to construct a hole for attaching a new temperature sensor to the hot water storage tank. There is no. For this reason, the situation that a water leak occurs from a hot water storage tank does not arise, and the problem of causing the fall of the system efficiency accompanying a water leak does not generate | occur | produce.
  Further, in the hot water supply system according to the present invention, in addition to the first characteristic configuration, the second heat source unit heats the low-temperature water by exchanging heat with the condensation heat from the condenser of the heat pump circuit. The second feature is that it is a heat pump water heater that generates water.
  According to the second characteristic configuration of the hot water supply system according to the present invention, for example, a new temperature sensor is attached to the hot water storage tank with respect to the conventional hot water supply system that uses only a hot water boiler such as a gas tank as a heat source machine. Therefore, a heat pump water heater with high thermal efficiency can be newly introduced into the system without performing construction for making a hole. For this reason, the situation that a water leak occurs from a hot water storage tank does not arise, and the problem of causing the fall of the system efficiency accompanying a water leak does not generate | occur | produce.
  In addition to the first or second characteristic configuration, the hot water supply system according to the present invention operates when the temperature detected by the temperature sensor is equal to or lower than the first temperature, and the first heat source device operates. A third feature is that control is performed to stop if the temperature is equal to or higher than the second temperature higher than the temperature.
  According to the third characteristic configuration of the hot water supply system according to the present invention, the second heat source machine is operated when the temperature of the hot water stored in the lower part of the hot water storage tank is lowered, and the second heat source machine is raised when the temperature rises above a predetermined temperature. Can be substantially controlled. In particular, when the hot water supply load is large, low-temperature water supplied from the water supply source passes through the cross joint, and is usually supplied from the water supply source rather than hot water stored in the hot water storage tank. Since the low temperature water is a low temperature, the second heat source machine can be operated immediately when the hot water supply load is high by setting the first temperature higher than the temperature of the low temperature water supplied from the water supply source in advance. Can do.
  According to the configuration of the present invention, even when a new heat source device is added to the conventional hot water storage tank that assumes only one heat source device, a hole for attaching a new temperature sensor to the hot water storage tank is provided. There is no vacant construction. For this reason, the situation that a water leak occurs from a hot water storage tank does not arise, and the problem of causing the fall of the system efficiency accompanying a water leak does not generate | occur | produce.
  Hereinafter, an embodiment of a hot water supply system according to the present invention (hereinafter referred to as “the present invention system” as appropriate) will be described with reference to the drawings. The same components as those in the conventional configuration shown in FIGS. 4 and 5 are denoted by the same reference numerals, and the description thereof is simplified or omitted.
  The following drawings schematically show the system configuration, and some components such as a pressure sensor are not shown.
  FIG. 1 is a schematic configuration diagram of the system of the present invention. The present invention system 10 shown in FIG. 1 includes a cross joint 43 having openings in four different directions instead of the three-way joint 41, as compared with the conventional hot water supply system 100 shown in FIG. The difference is that a temperature sensor 52 is inserted into the part. In other words, a cross joint 43 is interposed between the water inlet / outlet 31 and the heat pump water heater 2 in the second circulation circuit C2 shown in FIG.
  At this time, the hot water obtained from the water inlet / outlet 31 of the hot water storage tank 1 is supplied to the heat pump water heater 2 through the water inlet / outlet 31 and the cross joint 43, and the hot water heated by the heat pump water heater 2 is supplied from the water inlet 33. Re-supplied to the hot water storage tank 1. The low-temperature water supplied from the water supply source 5 is branched by the cross joint 43 into a path supplied from the water inlet / outlet 31 to the hot water storage tank 1 and a path supplied to the heat pump water heater 2.
  FIG. 2 is an enlarged schematic view of the structure of the cross joint 43. The cross joint 43 includes a first opening 43a, a second opening 43b, a third opening 43c, and a fourth opening 43d in four different directions.
  A temperature sensor 52 is inserted into the first opening 43a so as to reach the flow path inside the cross joint 43, and the temperature of the hot water flowing through the flow path inside the cross joint 43 can be measured. Has been. The second opening 43b is connected to a pipe connected to the water supply source 5, the third opening 43c is connected to a pipe connected to the heat pump water heater 2, and the fourth opening 43d is connected to the fourth opening 43d. The water inlet / outlet 31 is connected.
  Thereby, the low temperature water supplied from the water supply source 5 flows into the cross joint 43 from the second opening 43b, and then supplied to the heat pump water heater 2 from the third opening 43c, and the fourth opening. It branches off to the low temperature water supplied in the hot water storage tank 1 through the inlet / outlet 31 from the part 43d. The hot water stored in the hot water storage tank 1 flows into the cruciform joint 43 from the water inlet / outlet 31 through the fourth opening 43d and then is supplied to the heat pump water heater 2 from the third opening 43c. The temperature of the hot water or the low temperature water passing through the interior of the cross joint 43 can be detected by the temperature sensor 52 inserted from the first opening 43a.
  When configured in this way, when there is no supply of low-temperature water from the water supply source 5 and the heat pump water heater 2 and the circulation pump 13 are in a stopped state, the heat pump water heater 2 from the water inlet / outlet 31 in the second circulation circuit C2. Warm water will stay in the path up to. The temperature of the hot water that remains is about the same as that of the hot water in the hot water storage tank 1 near the water inlet / outlet 31. A cross joint 43 is interposed in the path from the water inlet / outlet 31 to the heat pump water heater 2 in the second circulation circuit C 2, and the temperature of the hot water passing through the joint 43 is measured by the temperature sensor 52. It is configured to be detectable. Therefore, the temperature of the hot water detected by the temperature sensor 52 is substantially equal to the temperature of the hot water stored in the lower part of the hot water storage tank 1.
  That is, when there is no supply of low-temperature water from the water supply source 5 and the heat pump water heater 2 and the circulation pump 13 are in a stopped state, the temperature sensor 52 detects the temperature of the hot water inside the cruciform joint 43, thereby substantially The result is equivalent to detecting the temperature of the hot water stored in the lower part of the hot water storage tank 1.
  Further, when there is no supply of low-temperature water from the water supply source 5 and the heat pump water heater 2 and the circulation pump 13 are in operation, hot water stored in the hot water storage tank 1 is taken out from the water inlet / outlet 31 and the cross joint 43 The hot water is supplied to the heat pump water heater 2 through the inside. That is, in such a case, the hot water in the hot water storage tank 1 near the water inlet / outlet 31 and the hot water passing through the cross joint 43 exhibit substantially the same temperature. For this reason, even in such a case, the temperature sensor 52 detects the temperature of the hot water passing through the cross joint 43, so that the temperature is substantially equal to the temperature of the hot water stored in the lower part of the hot water storage tank 1. It becomes.
  That is, when there is no supply of low temperature water from the water supply source 5, the temperature of the hot water passing through the cross joint 43 is detected by the temperature sensor 52, so that the hot water substantially stored in the lower part of the hot water storage tank 1 is detected. The result is equal to detecting the temperature. Therefore, similarly to the conventional water supply system 100 described above, the hot water boiler 3 and the circulation pump 24 are controlled based on the detection result of the temperature sensor 51, and the heat pump water heater 2 and the circulation pump 13 are controlled based on the detection result of the temperature sensor 52. By performing this control, the heat pump water heater 2 that is more efficient than the hot water boiler 3 can be preferentially operated, and high efficiency of the entire system can be realized.
  On the other hand, the case where the low temperature water is supplied from the water supply source 5 corresponds to the case where the hot water supply load 4 is relatively large with respect to the amount of hot water stored in the hot water storage tank 1. In such a case, the low temperature water supplied from the water supply source 5 always passes through the cross joint 43. That is, the temperature sensor 52 detects the temperature of the low-temperature water that passes through the cross joint 43.
  At this time, for example, if the temperature information given from the temperature sensor 52 is 50 ° C. or higher, the heat pump water heater 2 and the circulation pump 13 are stopped, while if the temperature information is 35 ° C. or lower, the heat pump water heater 2 and the circulation pump are used. When the control for operating 13 is performed, the temperature of the low-temperature water supplied from the water supply source 5 is usually 35 ° C. or lower, and thus the heat pump water heater 2 and the circulation pump 13 are operated. That is, when the hot water supply load 4 is relatively large with respect to the amount of hot water stored in the hot water storage tank 1, the heat pump water heater 2 is preferentially operated. Then, when the size of the hot water supply load 4 decreases with respect to the amount of hot water stored in the hot water storage tank 1 and the supply of low temperature water from the water supply source 5 is stopped, the interior of the cross joint 43 is as described above. The warm water that is passed through will exhibit a temperature that is approximately the same as that of the warm water near the inlet / outlet 31 in the hot water storage tank 1.
  That is, by setting it as the structure of this invention system 1, the heat pump water heater 2 can always be operated preferentially. And while controlling the heat pump water heater 2 based on the detection result of the temperature sensor 52, it is higher than the hot water boiler 3 by controlling the hot water boiler 3 based on the detection result of the temperature sensor 51 as in the prior art. The efficient heat pump water heater 2 can be operated preferentially, and high efficiency as the entire system can be realized.
  And when implement | achieving this invention system 1, it can implement | achieve only by using a commercially available cross joint (it is also called a cross joint), and inserting a temperature sensor in one hole. For this reason, in order to attach the temperature sensor 52 to the hot water storage tank 1 even when the heat pump hot water heater 2 is added as a new heat source apparatus to the conventional hot water storage tank 1 that only assumes the hot water boiler 3 as a heat source apparatus. Therefore, the system can be easily realized without affecting the reliability of the hot water supply system.
  Furthermore, since the temperature sensor 52 detects the temperature of the low-temperature water when the hot-water supply load 4 is large and low-temperature water is supplied from the water supply source 5, the temperature sensor 52 detects the temperature of the low-temperature water. The heat pump water heater 2 can be operated by immediately recognizing that the detected temperature is low. That is, when the hot water supply load 4 becomes a high load, it is possible to control the high-efficiency heat pump water heater 2 to operate immediately, and high efficiency of the entire system can be realized.
  In the above-described embodiment, the hot water heated by the heat pump water heater 2 is directly supplied to the hot water storage tank 1. However, the hot water boiler 3 may be supplied to the hot water storage tank 1 via the hot water boiler 3. I do not care. FIG. 3 is a schematic configuration diagram showing another embodiment of the system of the present invention.
  Compared with the system 10 of the present invention shown in FIG. 1, the system 10 a of the present invention shown in FIG. 3 newly includes the circulation pump 25 and the three-way joint 44, and does not include the check valve 15 and the three-way joint 42. That is, the hot water heated by the heat pump water heater 2 is supplied into the three-way joint 44 interposed between the check valve 17 and the hot water boiler 3 via the circulation pump 25, and the hot water is supplied via the three-way joint 44. It is the structure supplied to the boiler 3. The circulation pump 25 is controlled by a temperature sensor 52 as in the heat pump water heater 2. If the pressure can be supplied to the hot water boiler 3 only by the circulation pump 13, the circulation pump 25 is unnecessary.
  With this configuration, when the temperature sensor 52 detects 35 ° C. or less, the hot water heated by the heat pump water heater 2 passes through the circulation pump 25 and the three-way joint 44 without being heated in the hot water boiler 3. After that, hot water is supplied from the water inlet 33 to the hot water storage tank 1. On the other hand, when the temperature sensor 51 detects 35 ° C. or less, the hot water heated by the heat pump water heater 2 is supplied to the hot water boiler 3 and then heated again by the hot water boiler 3 to the hot water storage tank 1. Supplied.
  That is, in the case of the present invention system 10a, since the hot water heated by the heat pump water heater 2 is supplied to the hot water boiler 3 in advance, the temperature of the hot water supplied to the hot water boiler 3 is increased as compared with the present system 10. And since the heat exchange amount of the hot water boiler 3 can be reduced by this, the efficiency of the whole system improves.
In the above-described embodiment, the heat pump water heater 2 and the hot water boiler 3 are used as heat source devices. However, the heat source device includes a plurality of heat source devices and the temperature at which one heat source device is inserted into the cross joint 43. If it is the structure by which start / stop control is performed by the sensor 52, it will not be limited to the kind of heat source machine. Even when the heat pump water heater 2 and the hot water boiler 3 are provided, the heat pump water heater and the vacuum boiler using the CO 2 refrigerant are not limited as described above. Furthermore, the set temperature value described as the start / stop condition of the heat pump water heater 2 and the hot water boiler 3 is merely an example, and the set value is not limited to this value.
  Moreover, in each above-mentioned embodiment, the temperature sensor inserted in order to measure the temperature of the warm water which flows in the joint does not need to be inserted vertically downward, and does not depend on the insertion direction. Further, the connection positions between the joints and the attachment positions of the joints are not limited to the positions illustrated on the drawings, and can be arbitrarily changed within the scope of the present invention. For example, in FIG. 2, the water supply source 5 is connected to the opening 43b that faces the opening 43d that connects the inlet / outlet 31 of the hot water storage tank 1, and the opening 43a that is adjacent to the opening 43d in the clockwise direction is connected to the opening 43a. Although the temperature sensor 52 is inserted and the heat pump water heater 2 is connected to the opening 43c adjacent to the opening 43d in the counterclockwise position, the water supply source 5, the temperature sensor 52, and the heat pump water heater 2 may be configured to be connected (inserted) to any of the openings 43a to 43c. In FIG. 2, the opening 43 a and the opening 43 c are configured to face each other in the vertical direction, but may be configured to face each other in the horizontal direction, for example.
  The hot water supply system according to the present invention can be used for, for example, a heat pump type hot water supply system, can maintain high energy efficiency of the heat pump type hot water supply system, and can automatically respond to instantaneous hot water supply to a high hot water supply load. It is possible to provide a hot water supply system capable of increasing the internal hot water supply pressure.
Schematic configuration diagram of a hot water supply system according to the present invention Schematic diagram enlarging the cross joint structure Another schematic configuration diagram of a hot water supply system according to the present invention Schematic configuration diagram of a conventional hot water supply system Path diagram of first circulation circuit and second circulation circuit
Explanation of symbols
DESCRIPTION OF SYMBOLS 1: Hot water storage tank 2: Heat pump water heater 3: Hot water boiler 4: Hot water supply load 5: Water supply source 10, 10a: Hot water supply system 11, 12, 14, 16, 18, 19, 21, 22: Valve 13, 23, 24, 25: Circulation pump 15, 17: Check valve 31: Inlet / outlet port 32, 34: Outlet port 33, 35: Inlet port 41, 42, 44: Three-way joint 43: Cross joint 43a, 43b, 43c, 43d : Opening 51, 52: Temperature sensor 100: Conventional hot water supply system C1, C2: Circulation circuit

Claims (3)

  1. A first heat source machine and a second heat source machine for heating the supplied hot water;
    A hot water storage tank for storing hot water and supplying the stored hot water to a hot water supply load;
    A first circulation circuit in which hot water obtained from a water outlet provided at a lower part of the hot water storage tank is re-supplied to the hot water storage tank again via the first heat source unit;
    A second circulation circuit in which hot water acquired from an inlet / outlet provided at the lower part of the hot water storage tank is re-supplied to the hot water storage tank directly through the second heat source unit or again through the first heat source unit. When,
    In the second circulation circuit, a cruciform joint having first to fourth openings in four directions interposed between the water inlet / outlet and the second heat source unit,
    A temperature sensor that is inserted so as to reach the flow path inside the cross joint from the first opening, and is capable of measuring the temperature of hot water that flows through the flow path inside the cross joint. ,
    By connecting a water supply source for supplying low-temperature water to the second opening, connecting the second heat source machine to the third opening, and connecting the water inlet / outlet to the fourth opening, Low temperature water supplied from a water source is branched at the cross joint and configured to be supplied to the hot water storage tank and the second heat source machine,
    The hot water supply system is characterized in that the second heat source unit is controlled to start and stop according to the temperature detected by the temperature sensor.
  2.   2. The hot water supply device according to claim 1, wherein the second heat source device is a heat pump water heater that generates hot water by heating the low-temperature water by exchanging heat with condensation heat from a condenser of a heat pump circuit. system.
  3.   The second heat source machine is controlled to operate when a temperature detected by the temperature sensor is equal to or lower than a first temperature, and to stop when the temperature is equal to or higher than a second temperature higher than the first temperature. The hot water supply system according to 1 or 2.
JP2008087967A 2008-03-28 2008-03-28 Hot water system Expired - Fee Related JP5161628B2 (en)

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