JP2007170770A - Hot-water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-water supply system capable of securing a hot water supply capacity necessary for a heat pump type hot-water supply system by keeping high energy efficiency. <P>SOLUTION: In this hot-water supply system, supplied water is supplied to a heat pump hot-water supply means 4, and the heated hot water flows from an upper area to a hot water storage tank 3. Further the supplied water flows to a lower area of the hot water storage tank 3, the water stored at the lower area is heated by a gas water heater 7, and the heated hot water flows from the upper area to the hot water storage tank 3. A temperature detector 9 measuring a temperature of hot water of the upper area in the hot water storage tank 3, and a temperature detector 43 for measuring a temperature of the hot water stored in the lower area with respect to the detector 9 are disposed in the hot water storage tank 3, the gas water heater 7 is controlled to be started and stopped on the basis of the temperature information of the temperature detector 9, and the heat pump hot-water supply means 4 is controlled to be started and stopped on the basis of the temperature information of the temperature detector 43. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a hot water supply system configured to be able to supply hot water to a hot water supply load from a hot water storage tank in which hot water is stored, and as a heating means for supplying hot water, heat exchange with heat condensed from a condenser of a heat pump circuit Thus, the present invention relates to a hot water supply system comprising a heat pump hot water supply means for heating water and an auxiliary hot water supply means for heating water by gas fired or oiled.

  A heat pump type hot water supply system uses cheap electric power at night, stores hot water in a hot water storage tank during a low hot water supply load state where the amount of hot water used at night is low, and supplies hot water during the daytime, such as a bath. A system used for hot water supply such as a shower or shower is common.

  FIG. 9 shows an outline of a heat pump type hot water supply system having a conventional configuration. As shown in FIG. 9, a heat pump hot water supply system 1h having a conventional configuration includes a heat pump hot water supply means 4 for heating and supplying hot water by exchanging heat with condensation heat from a condenser of a heat pump circuit, and hot water that has been heated. A hot water storage tank 3 is provided.

  When the low temperature water is supplied from the water supply tank 2 in which the hot water supplied from the water supply (not shown) is stored, the hot water storage tank 3 supplies the low temperature water to the heat pump hot water supply means 4 and is heated by the heat pump hot water supply means 4. Hot water is again supplied and stored. The hot water stored in the hot water storage tank 3 in this manner flows out by the water pressure from the water supply tank 2 when the shower or currant constituting the hot water supply load 4 is opened, and is used as hot water supply in the load. The hot water that has not been used in the hot water supply load 5 is again supplied to the hot water storage tank 3 and stored in the tank.

  In addition, a circulation pump 6 is provided in a pipe for supplying hot water from the hot water storage tank 3. When the hot water supply load 5 is a circulation load, the hot water sent from the hot water storage tank 3 by the pump 6 reduces the hot water supply load 5. It is the structure which is again input into the hot water storage tank 3 via this. Further, a circulation pump 6 may be provided between the hot water supply load 5 and the hot water storage tank 3 (return pipe).

  By the way, as described above, the heat pump type hot water supply system stores hot water in a hot water storage tank in a time zone where a low hot water supply load is low and uses hot electricity at night, and the daytime of the next day. This system is used for hot water supply loads such as hot water supply such as baths and showers. That is, since the heating capacity of the heat pump hot water supply means 2 is determined on the assumption of a low hot water supply load state 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 high. When the hot water in the hot water storage tank is consumed at the time of a high hot water supply load, the hot water supply capacity may be insufficient. In addition, heat is stored at night and hot water is used in the daytime and evening of the following day, and the usage time is greatly shifted, so heat dissipation from the hot water storage tank increases, and heat stored with high efficiency is dissipated. Problems arise.

  Furthermore, since the heating capacity of the heat pump hot water supply means 3 is affected by the outside air temperature and the water temperature, it is necessary to set a high safety factor for the hot water supply system, and the system may be excessive in capacity.

  In order to compensate for the lack of heating capacity of the heat pump hot water supply means and to secure the hot water supply capacity required for the heat pump hot water supply system, the hot water supply provided with an electric water heater provided with a hot water storage tank between the hot water storage tank and the hot water supply load. A system is disclosed (for example, see Patent Document 1).

JP 2003-106652 A

  For example, as disclosed in Patent Document 1, when an electric water heater is added in order to ensure a hot water supply capacity necessary for a heat pump hot water supply system, it is necessary to operate the electric water heater during a high hot water supply load in the daytime. Yes, it causes an increase in operating costs due to high daytime electricity charges. Moreover, since an electric water heater is inferior in energy efficiency from the viewpoint of primary energy, there is a problem that overall energy efficiency of the entire system is lowered.

  In addition, a hot water supply system (see FIG. 10) for supplying hot water to a hot water supply load by a conventional fuel combustion type hot water heater (for example, a gas fired water heater) improves the hot water supply capacity as compared with the heat pump hot water supply means, but is in terms of thermal efficiency. Has a problem that it is lower than the heat pump hot water supply means. A hot water supply system 1i shown in FIG. 10 includes a gas water heater / heater 7, in which low-temperature water supplied from the water supply tank is stored in the hot water storage tank 3, and water supplied from the hot water storage tank 3 is stored by the gas water heater / water heater 7. After the heating, hot water is supplied to the hot water storage tank 3.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a hot water supply system that can ensure hot water supply capacity necessary for a heat pump hot water supply system while maintaining high energy efficiency.

  In order to achieve the above object, a hot water supply system according to the present invention comprises a heat pump hot water supply means for heating and supplying hot water by exchanging heat with condensation heat from a condenser of a heat pump circuit, hot water stored, and hot water stored. A hot water storage tank for supplying hot water to the hot water supply load, and auxiliary hot water supply means for heating the hot water supplied from the hot water storage tank and then supplying the hot water storage tank again to the auxiliary hot water supply means by the heat pump hot water supply means. Heated hot water is directly supplied, or hot water heated by the heat pump hot water supply means is stored in the hot water storage tank, and then hot water is supplied from the hot water storage tank to the auxiliary hot water supply means. First feature.

  In addition to the first feature, the hot water supply system according to the present invention is configured to supply low-temperature water supplied from a water supply source to the heat pump hot water supply means and the hot water storage tank, and the heat pump hot water supply means The second feature is that hot water is supplied to the hot water storage tank after heating the supplied low-temperature water.

  In addition to the first or second feature, the hot water supply system according to the present invention is configured to supply low-temperature water supplied from a water supply source to the heat pump hot water supply means and the hot water storage tank, and the heat pump A third feature is that the hot water supply means supplies the hot water to the auxiliary hot water supply means after heating the supplied low temperature water.

  Further, in the hot water supply system according to the present invention, in addition to the second feature, the auxiliary hot water supply means and the heat pump hot water supply means are controlled to start and stop according to the temperature of the hot water stored in the hot water storage tank, respectively. A fourth feature is that the control is performed such that the heat pump hot water supply means is operated with priority over the auxiliary hot water supply means.

  In addition to the fourth feature described above, the hot water supply system according to the present invention has a fifth feature that the auxiliary hot water supply means is configured to control the combustion output in a plurality of stages according to the temperature of the hot water stored in the hot water storage tank. It is characterized by.

  Further, in the hot water supply system according to the present invention, in addition to the fourth or fifth feature, the hot water storage tank has a water inlet for receiving the low temperature water and a water outlet for discharging the auxiliary hot water supply means in a lower region. And a water inlet into which hot water supplied from the auxiliary hot water supply means enters, a water inlet from which hot water supplied from the heat pump hot water supply water enters, and a water outlet from which hot water is discharged to the hot water supply load. The auxiliary hot water supply means is controlled to start and stop in accordance with the temperature of the hot water at the first temperature detection position in the hot water storage tank, and the heat pump hot water supply means is the first temperature detection in the hot water storage tank. A sixth feature is that the start / stop control is performed according to the temperature of the hot water at the second temperature detection position below the position.

  In addition to any one of the first to sixth features, the hot water supply system according to the present invention includes a buffer tank that stores the low-temperature water supplied from the water supply source, the heat pump hot water supply means, and the hot water storage tank. The seventh feature is that the low-temperature water output from the buffer tank is supplied to the heat pump hot water supply means and the hot water storage tank.

  Moreover, the hot water supply system according to the present invention is configured such that, in addition to any one of the first to seventh features, the heat pump hot water supply means absorbs the heat energy of the outside air and uses it for heating the water, An eighth feature is that the heat supply from the auxiliary hot water supply means can be absorbed by being installed close to the auxiliary hot water supply means.

  Further, the hot water supply system according to the present invention has a ninth feature that, in addition to any one of the first to eighth features, the heat pump hot water supply means and the auxiliary hot water supply means are installed in the same casing. And

  According to the hot water supply system of the first feature, the hot water heated by the auxiliary hot water supply means is supplied to the hot water storage tank, and the water supplied to the auxiliary hot water supply means in the preceding stage is previously supplied by the heat pump hot water supply means. Since the structure is heated, the water before heating supplied to the auxiliary hot water supply means is subjected to constant heating in advance, thereby improving the efficiency of the entire system.

  In addition, in the case of a hot water supply system configured solely by the heat pump hot water supply means, the amount of water that can be heated by the heat pump hot water supply means is limited, so when the hot water supply load is in a high load state, there is insufficient hot water in the hot water storage tank, or Although there is a problem that only low-temperature hot water can be supplied, according to the system of the present invention, the heating capability of the heat pump hot water supply means can be supplemented by the auxiliary hot water supply means, so that it is possible to cope with high loads.

  On the other hand, the efficiency of the entire system is improved because a high-efficiency heat pump hot water supply means is used in combination as compared with a system composed only of a fuel combustion type water heater. In particular, since it is configured to heat with the heat pump hot water supply means and then with the auxiliary hot water supply means, it is not necessary to generate high-temperature hot water with the heat pump hot water supply means, while the auxiliary hot water supply means is supplied with heated hot water. Since it is not necessary to perform a large amount of heat exchange, the efficiency is further improved as compared with the case where both hot water supply means are simply combined.

  Moreover, since the combustion type hot water machine utilized conventionally can be utilized as an auxiliary hot water supply means, a highly versatile system can be realized.

  According to the hot water supply system of the second feature, in addition to the effect of the first feature, low temperature water from the water supply source is supplied to the heat pump hot water supply means, so that the operating efficiency of the heat pump hot water supply means is improved. And this further improves the overall system efficiency.

  According to the hot water supply system of the third feature, in addition to the effect according to the first feature, the low temperature water from the water supply source is supplied to the heat pump hot water supply means. And this further improves the overall system efficiency. In addition, since it is possible to circulate hot water between the heat pump hot water supply means and the hot water storage tank, the heat pump hot water supply means can be operated even when there is no load, thereby improving the operating rate of the heat pump hot water supply means. .

  In general, the heat pump hot water supply means is a hot water supply means that shows high efficiency in principle as compared with a combustion type hot water heater such as a gas-fired hot water heater. A hot water supply system can be realized.

  In addition, according to the hot water supply system of the fourth feature, the heat pump hot water supply means that shows high efficiency in principle as compared with a combustion type hot water heater such as a gas-fired hot water heater can be operated at a high operating rate. An efficient hot water supply system can be realized. Furthermore, since it is configured to control the start / stop of the heat pump hot water supply means or auxiliary hot water supply means based on the information on the hot water temperature stored in the hot water storage tank, the control content is simple and it is necessary to provide a complicated control circuit separately. There is no.

  Further, according to the hot water supply system of the fifth feature, since the combustion state of the auxiliary hot water supply means can be reduced during operation of the auxiliary hot water supply means, the operating rate can be reduced, and the entire system can be reduced. Efficiency can be further improved.

  Further, according to the hot water supply system of the sixth feature, since the heat pump hot water supply means or the auxiliary hot water supply means is controlled based on the information on the hot water temperature stored in the hot water storage tank, the control content is simple, There is no need to provide a complicated control circuit separately.

  Further, according to the hot water supply system of the seventh feature, when the hot water supply load is small, the temperature of the water flowing into the heat pump hot water supply means can be reliably brought close to the temperature of the water supplied from the water supply source. The water temperature can be lowered. As a result, the efficiency of the heat pump hot water supply means is improved, so that the efficiency of the entire system is further improved.

  Further, according to the hot water supply system of the eighth feature, the outside air temperature of the heat pump hot water supply means rises due to the heat radiation of the auxiliary hot water supply means, thereby improving the efficiency of the heat pump hot water supply means and further improving the efficiency of the entire system. .

  Moreover, according to the hot water supply system of the ninth feature, the heat pump hot water supply means can efficiently absorb the heat radiation of the auxiliary hot water supply means, and the efficiency of the heat pump hot water supply means can be further improved.

  Hereinafter, an embodiment of a hot water supply system according to the present invention (hereinafter abbreviated as “the present invention system” as appropriate) will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic configuration diagram showing a configuration of a first embodiment (hereinafter, abbreviated as “this embodiment” as appropriate) of the system of the present invention. In addition, the double line in a figure has shown the piping of the water channel, and the broken line has shown the signal line for control.

  Further, in each of the following embodiments, a place where water flows into a tank or the like is described as a water inlet, and a place where water flows out from the tank or the like is described as a water outlet, but in the embodiment, water flows out from the same water inlet. Or water may flow in from the outlet. For this reason, when there is a possibility of inflow and outflow from the inlet or outlet with the same reference numerals, it will be appropriately described as inlet / outlet.

  A system 1a of the present invention shown in FIG. 1 includes a water supply tank 2, a hot water storage tank 3, a heat pump hot water supply means 4, a hot water supply load 5, and a gas-fired hot water machine 7 as auxiliary hot water supply means. In the following description, a gas-fired water heater in which the fuel is gas is used as auxiliary hot water supply means. However, an oil-fired water heater using oil as fuel may be used, and other fuels and energy may be used. May be.

  Further, the hot water storage tank 3 is provided with a temperature detector 9 for detecting the temperature of the hot water to be stored, and the temperature information detected by the detector 9 is stored in the hot water storage device 7 and the hot water storage device 7. In order to guide the hot water to the tank 3, it is supplied to a circulation pump 11 interposed in the pipe. Furthermore, a circulation pump 6 for circulating hot water between the hot water supply load 5 and the hot water storage tank 3 is provided.

  A specific pipe line configuration will be described below.

  Water supplied from a water supply (not shown) is stored in a water supply tank 2, and the stored water is supplied to a water inlet 31 of the heat pump hot water supply means 4 through a pipe 21 and a pipe 22. Then, the water is supplied to the water inlet 33 of the hot water storage tank 3 through the pipe 21 and the pipe 24. The water supply source supplied to the pipeline 21 is not limited to a tank form, and any form may be used as long as low temperature water is supplied.

The heat pump hot water supply means 4 is constituted by a CO ₂ heat pump adopting, for example, CO ₂ as a refrigerant of the heat pump circuit, and heats the water supplied from the water inlet 31 by heat exchange with heat radiation from the condenser of the heat pump circuit, The water is supplied from the outlet 32 to the inlet 35 of the gas water heater 7 through the pipe 41. For example, the compressor of the heat pump circuit is composed of a three-phase induction motor, and operates using commercial power (three-phase 200 V) as a power source. A circulation pump 42 is interposed in the pipe 41.

  Moreover, the hot water output from the water outlet 34 of the hot water storage tank 3 is supplied to the water inlet 35 of the gas-fired water heater 7 through the pipe 25. The hot water supplied from the water inlet 35 is heated by the gas water heater 7, and warm water is output from the water outlet 36. The hot water is supplied to the water inlet 37 of the hot water storage tank 3 through the pipeline 26. In addition, the check valve 12 is interposed in the pipe line 25 so that hot water discharged from the heat pump hot water supply means 4 through the pipe line 41 does not flow back into the water outlet 34 of the hot water storage tank 3.

  The gas tank hot water machine 7 is constituted by, for example, a gas tank vacuum type hot water machine. The gas-fired vacuum water heater is provided with a furnace that heats the heat transfer water with the flame of the gas burner at the bottom of the can body, and a U-shaped heat transfer tube in the decompressed air at the top of the can body. The heat transfer water sealed in the lower part of the gas is heated by the flame of the gas burner, and the heat transfer pipe in the reduced pressure air at the upper part is heated to heat the water flowing in the heat transfer pipe.

  In addition, the water inlet 33 and the water inlet 37 exist in positions separated from each other in the hot water storage tank 3, the water inlet 33 is installed in a lower area of the hot water tank 3, and the water inlet 37 is an upper area of the hot water tank 3. Installed.

  Water has a property of moving upward as the temperature increases, so-called convection. The hot water storage tank 33 is supplied with low-temperature water from a water inlet 33 installed in the lower region, and has hot water (at least higher than water supplied from the water inlet 33) from the water inlet 37 installed in the upper region. Therefore, the hot water stored in the tank 33 shows a temperature distribution that becomes higher as it goes to the upper region.

  In addition, a circulation pump 11 is installed in the pipeline 26, and the pump 11 is controlled to start and stop based on temperature information of a temperature detector 9 described later.

  The hot water storage tank 3 supplies hot water stored in the tank to the hot water supply load 5 through a pipe 27 from a water outlet 38 provided in the upper region. As described above, since hot water having a high temperature is stored in the upper region of the hot water storage tank 3, high temperature hot water can be supplied to the hot water supply load 5. The hot water supply load 5 is constituted by a currant, a shower, a bathtub, or the like, for example.

  Further, when the hot water supply load 5 is a circulation load, the circulation pump 6 is operated so as to circulate the hot water through the pipeline 27 and the pipeline 28. The circulation load is for circulating hot water for the purpose of preventing a decrease in the temperature of the hot water due to heat radiation in the pipe line 27. The hot water circulated in this way is fed from the water inlet 39 of the hot water storage tank 3 through the conduit 28. The water inlet 39 is installed above the water inlet 33.

  When the currant or shower is opened, the water pressure from the water supply tank 2 causes water from the water supply tank 2 to flow into the hot water storage tank 3 via the conduit 24 and to the heat pump hot water supply means 4 via the conduit 22. Inflow. The water that has flowed into the heat pump hot water supply means 4 is heated by the heat pump hot water supply means 4, and then the heated hot water is supplied to the gas water heater 7 via the pipe line 41 and the pipe line 25. Then, the hot water flows into the hot water storage tank 3. As a result, the hot water stored in the hot water storage tank 3 is pushed out from the water outlet 38 and supplied to the output of the currant or shower through the conduit 27. On the other hand, even when the hot water supply load is not used, hot water is re-input to the hot water storage tank 3 through the pipe line 27 and the pipe line 28 when the circulation pump 6 is operated.

  Further, a temperature detector 9 is installed in the upper area of the hot water storage tank 3, and the temperature of the hot water stored in the area is measured. The temperature information of the hot water measured by the temperature detector 9 is sent to the circulation pump 11 and the gas water heater 7.

  The circulation pump 11 and the gas tank hot water machine 7 are configured to be started and stopped based on temperature information given from the temperature detector 9. For example, if the temperature information given from the temperature detector 9 exceeds 60 ° C., the combustion of the gas fired water heater 7 is stopped and the operation of the circulation pump 11 is stopped. On the other hand, if the temperature information given from the temperature detector 9 is below 50 ° C., the combustion of the gas fired water heater 7 and the operation of the circulation pump 11 are started. The set temperature value is merely an example, and the set value is not limited to this value.

  When comprised in this way, while the warm water heated by the heat pump hot-water supply means 4 is supplied to the gas tank warm water machine 7, if the gas tank warm water machine 7 is in an operating state, the gas tank warm water machine 7 Further, the hot water is stored in the hot water storage tank 3 by being heated and supplied to the upper region of the hot water storage tank 3. Then, the hot water supply load 5 is supplied from a water outlet 38 installed in the upper region of the hot water storage tank 3.

  That is, the system 1a of the present invention is configured such that after the water is heated by the heat pump hot water supply means 4, it is further heated by the gas-fired water heater 7, and the hot water supply tank 5 stores the hot water after the heating. Therefore, the heat pump hot water supply means 4 does not need to be heated to a very high temperature, and may be set to be heated to about 42 ° C., for example. For this reason, the heat pump hot-water supply means 4 does not need to make hot water temperature so high, and can perform a highly efficient operation.

  Further, since the hot water heated by the heat pump hot water supply means 4 is directly input to the gas water heater 7, compared with the structure in which only the hot water from the hot water storage tank 3 is supplied to the gas water heater 7. The temperature of the hot water that enters the hot water rises. As a result, the heat exchange amount of the gas water heater 7 can be reduced, and the efficiency of the system is improved.

  In the above description, the gas fired water heater 7 and the circulation pump 11 are controlled to start and stop based on the temperature information of the temperature detector 9. However, the temperature detector 9 also applies to the heat pump hot water supply means 4 and the circulation pump 42. The start / stop control may be performed based on the temperature information (see FIG. 2). At this time, the heat pump hot water supply means 4 and the circulation pump 42 may be configured to be started and stopped so that the heat pump hot water supply device 7 and the circulation pump 11 are operated more preferentially than the gas hot water heater 7 and the circulation pump 11. That is, as in the above-described example, if the temperature information provided from the temperature detector 9 to the gas tank hot water machine 7 and the circulation pump 11 exceeds 62 ° C., the gas pump water heater 7 is stopped from burning and the circulation pump 11 On the other hand, if the temperature information given from the temperature detector 9 is below 55 ° C., the combustion of the gas fired water heater 7 and the operation of the circulation pump 11 may be started. By setting in this way, the high-efficiency heat pump hot water supply means 4 can be preferentially operated as compared with the gas water heater 7 and the efficiency of the entire system can be improved.

  At this time, even if only the heat pump hot water supply means 4 is operating and the gas-fired hot water machine 7 is not in operation, the circulating pump 42 is operating, so the hot water discharged from the heat pump hot water supply means 4 is circulated. The hot water is supplied from the water inlet 37 to the hot water storage tank 3 through the pipe 41, the pipe 45, and the pipe 26 by the pump pressure of the pump 42.

  In addition to the check valve 12, each of the pipe lines 21 to 28 is appropriately required among an on-off valve (two-way valve), a check valve, a pressure reducing valve, a constant flow valve, a safety valve, an automatic air vent valve, and the like. It does not matter if something is interposed. Further, an open / close valve and a circulation pump may be provided inside the water inlet 31 of the heat pump hot water supply means 4.

The heat pump hot water supply means 4 may be installed close to the gas water heater 7. For example, the CO ₂ heat pump hot water supply means absorbs the heat energy of the outside air and uses it for heating water. Therefore, the higher the outside air temperature around the hot water supply means, the higher the efficiency. In this case, by installing the heat pump hot water supply means 4 close to the gas water heater 7, the ambient temperature of the heat pump hot water supply means 4 rises due to heat radiation from the gas water heater 7, and thereby the heat pump water heater 4 Since the thermal efficiency is increased, the arrangement as described above further improves the efficiency of the entire system. In particular, it is possible to suppress a decrease in the efficiency of the heat pump hot water supply means 4 even in the winter season when the outside air temperature decreases.

  At this time, the heat pump hot water supply means 4 is installed in the same housing as the gas water heater 7 so that the efficiency of recovering heat from the gas water heater 7 is further improved.

<Second Embodiment>
A second embodiment of the system of the present invention (hereinafter referred to as “this embodiment” as appropriate) will be described below with reference to the drawings. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 3 is a schematic configuration diagram showing the configuration of the system 1b of the present invention in the present embodiment. This embodiment is different from the first embodiment in that hot water discharged from the heat pump hot water supply means 4 is supplied to the upper region of the hot water storage tank 3. That is, the pipe 41 connected to the water outlet 32 of the heat pump hot water supply means 4 is connected to the pipe 26 connecting the water outlet 36 of the gas water heater 7 and the water inlet 37 of the hot water storage tank. In addition, the hot water supply temperature of the heat pump hot water supply means 4 shall be set to higher temperature (for example, 60 degreeC) than the preset temperature of 1st Embodiment.

  Further, since the pipe 41 through which the hot water discharged from the heat pump hot water supply means 4 passes is not connected to the pipe 25 that connects the hot water storage tank 3 and the gas tank hot water machine 7, as in the configuration of the first embodiment. Hot water discharged from the heat pump hot water supply means 4 does not flow into the pipe 25, and therefore the check valve 12 interposed in the pipe 25 as shown in FIG. 1 is not necessarily required.

  The hot water storage tank 3 has another temperature detector 43 for measuring the hot water temperature in the lower region of the temperature detector 9, and the heat pump hot water supply means 4 and the circulation pump 42 based on the information of the temperature detector 43. The start / stop control is performed. In FIG. 3, for the purpose of avoiding confusion, the broken line indicating the flow of temperature information from the temperature detector 9 and the broken line indicating the flow of temperature information from the temperature detector 43 are of different types. In the following drawings, the illustrated method is used within a range not causing confusion.

  In the system 1b of the present embodiment, the gas tank water heater 7 and the circulation pump 11 are controlled based on the temperature information of the temperature detector 9, and the heat pump hot water supply means 4 and the circulation pump are controlled based on the temperature information of the temperature detector 43. 42 is controlled. That is, as in the first embodiment, if the temperature information given from the temperature detector 9 exceeds 60 ° C., the combustion of the gas fired water heater 7 is stopped and the operation of the circulation pump 11 is stopped. If the temperature is lower than 0 ° C., the combustion of the gas fired water heater 7 and the operation of the circulation pump 11 are started. Further, for example, if the temperature information given from the temperature detector 43 exceeds 60 ° C., the combustion of the heat pump hot water supply means 4 is stopped and the operation of the circulation pump 42 is stopped, while if it is lower than 50 ° C., the heat pump hot water supply means. 4 and the operation of the circulation pump 42 are started.

  The circulation pump 11 is controlled together with the gas tank hot water machine 7 and the circulation pump 42 is controlled along with the heat pump hot water supply means 4. Only the control for the hot water machine 7 and the heat pump hot water supply means 4 will be described, and the reference for the circulation pump 11 and the circulation pump 42 will be omitted.

  When configured in this manner, low temperature water is supplied to the lower region of the hot water storage tank 3 from the water inlet 33, while high temperature water is supplied to the upper region from the water inlet 37, so that hot water is stored in the hot water storage tank 3. The hot water temperature of the hot water becomes higher as it goes upward. That is, the hot water temperature detected by the temperature detector 9 positioned above is higher than the hot water temperature detected by the temperature detector 43 positioned below.

  For example, it is assumed that the temperature of hot water stored in the hot water storage tank 3 is 60 ° C. or more over the entire tank at a certain point in time when the hot water supply load is no load. In this case, the gas water heater 7 and the heat pump hot water supply means 4 are controlled to be stopped. Under such circumstances, it is assumed that the hot water supply load 5 is in a load state and hot water is supplied from the hot water storage tank 38 to the hot water supply load 5.

  When hot water is supplied from the hot water storage tank 3 to the hot water supply load 5 via the pipe line 27, the water pressure from the water supply tank 2 causes an inlet installed in the lower area of the hot water storage tank 3 via the pipe lines 21 and 24. Low temperature water flows into the hot water storage tank 3 from the water port 33. As a result, the hot water temperature in the lower region in the hot water storage tank 3 starts to decrease.

  As described above, since water is generally convective, the low-temperature water flowing from the water inlet 33 stays in the lower region of the hot water storage tank 3, whereby the hot water temperature in the hot water storage tank 3 decreases from the lower region. Begin.

  For this reason, the temperature detector 43 indicates 50 ° C., which is a lower limit temperature at which an operation start instruction is issued before the temperature detector 9 positioned above the temperature detector 43. When it is confirmed that the temperature information indicated by the temperature detector 43 has fallen below 50 ° C., the heat pump hot water supply means 4 starts operation. At this time, since the operation of the circulation pump 42 is started at the same time, the low-temperature water supplied from the water supply tank 2 is sent to the water inlet 31 of the heat pump hot water supply means 4 through the pipe 22. The heat pump hot water supply means 4 heats the supplied low-temperature water, and then guides the hot water from the water outlet 32 to the water inlet 37 of the hot water storage tank 3 through the pipe 41.

  Further, if hot water more than the hot water supply capacity of the heat pump hot water supply means 4 continues to be used by the hot water supply load 5, low temperature water continues to be supplied from the water inlet (inlet / outlet water inlet) 33 of the hot water storage tank 33. Further decreases, and the temperature indicated by the temperature detector 9 gradually decreases. And if the hot water temperature which the temperature detector 9 shows is less than 50 degreeC, the gas-fired water heater 7 will start an operation | movement. At this time, since the operation of the circulation pump 11 is started at the same time, the low-temperature water supplied from the water outlet 34 located in the lower region of the hot water storage tank 3 is sent to the water inlet 35 of the gas water heater 7. The gas water heater 7 heats the supplied low-temperature water, and then guides the hot water from the water outlet 36 to the water inlet 37 of the hot water storage tank 3 through the pipe 26.

  As a result, the temperature of the hot water located in the upper region of the hot water storage tank 3 increases the rising speed. Under such circumstances, when the hot water supply load 5 shifts to the low load state, the temperature of the hot water located in the upper region in the hot water storage tank 3 further increases. And if the temperature exceeding 60 degreeC is detected by the temperature detector 9, the gas fired water heater 7 will stop driving | operation. On the other hand, the heat pump hot water supply means 4 continues operation.

  Thereafter, when a transition is made to the no-load state, hot hot water supplied from the heat pump hot water supply means 4 is supplied from a water inlet 37 located above the hot water storage tank 3 and from the water outlet (water inlet / outlet) 33 into the hot water storage tank 3. Is supplied to the water inlet 31 of the heat pump hot water supply means 4 through the pipe 24 and the pipe 22. That is, hot water is circulated between the heat pump hot water supply means 4 and the hot water storage tank 3. As a result, the temperature of the hot water in the lower region gradually rises, and when the temperature detector 43 detects that the temperature has exceeded 60 ° C., the heat pump hot water supply means 4 stops its operation.

  That is, by being configured in this way, the control for preferentially operating the heat pump hot water supply means 4 over the gas fired water heater 7 is performed. As described above, since the heat pump hot water supply means 4 is configured to achieve higher efficiency by itself than the gas-fired hot water machine 7, it is possible to improve the operating rate of the high efficiency hot water supply means, thereby improving the overall efficiency of the system. Can be realized.

  Furthermore, in the above description, for example, when both the hot water supply means 4 of the gas fired hot water machine 7 and the heat pump hot water supply means 4 are stopped, first, when the heat pump hot water supply means 4 starts operation, the hot water discharged from the heat pump hot water supply means 4 Flows into the upper region of the hot water storage tank 3, so that when the hot water supply load 5 is low, the hot water indicated by the temperature detector 9 until the temperature of the hot water indicated by the temperature detector 43 exceeds 60 ° C. It is also expected that the temperature will never fall below 50 ° C. That is, in such a case, it is possible to cope with the hot water supply load 5 by operating only the high efficiency heat pump hot water supply means 4 without operating the low efficiency gas fired water heater 7.

  The present embodiment is configured such that the heat pump hot water supply means 4 is controlled to be operated more preferentially than the gas water heater 7 based on the temperature of hot water stored in the hot water storage tank 3. As in the above example, even if the lower limit temperature that is a threshold value that gives an operation start instruction to the gas-fired water heater 7 and the lower limit temperature that becomes a threshold value that gives an operation start instruction of the heat pump hot water supply means 4 are the same value, Since the hot water temperature measurement location that is a criterion for controlling the gas-fired water heater 7 is in a higher temperature region than the hot water temperature measurement location that is a criterion for controlling the heat pump hot water supply means 4, the heat pump The hot water supply means 4 starts operation first.

  Therefore, for example, the gas water heater 7 starts operation when the temperature indicated by the temperature detector 9 falls below 45 ° C., and stops operation when the temperature exceeds 58 ° C., while the temperature indicated by the temperature detector 43. When the temperature falls below 53 ° C., the heat pump hot water supply means 4 starts operation, and control may be performed to continue the operation until it exceeds 60 ° C. That is, the temperature value serving as a threshold value for giving start / stop control is not limited to the above value.

  Moreover, although it was set as the structure provided with the separate temperature detector for each control of the heat pump hot-water supply means 4 and the gas-fired hot water machine 7 in the above-mentioned, the minimum temperature which gives an operation start instruction | indication and the upper limit temperature which gives an operation stop are different, respectively. By setting the value, it is possible to realize even a configuration including a single temperature detector. At this time, the temperature information detected by the temperature detector is provided to each of the gas water heater 7, the circulation pump 11, the heat pump hot water supply means 4, and the circulation pump 42.

  At this time, for example, when the temperature indicated by the temperature detector falls below 45 ° C., the gas-fired water heater starts its operation, stops operation when it exceeds 58 ° C., and when it falls below 53 ° C. Thus, the heat pump hot water supply means 4 can be set to perform control so that the operation is continued until the temperature exceeds 60 ° C. while the operation starts.

  In the present embodiment, the hot water storage tank 3 is provided with another temperature detector 44 at a position further above the temperature detector 9, and the gas water heater 7 is based on information on the hot water temperature indicated by the temperature detector 44. The output may be adjusted.

  FIG. 4 is a schematic configuration diagram showing another configuration example of the present embodiment according to the system of the present invention. Compared with the system 1b of the present invention shown in FIG. 3, the system 1c of the present invention shown in FIG. 4 further includes a temperature detector 44 in the hot water storage tank 3, and the temperature information indicated by the temperature detector 44 is the gas hot water. This is a configuration given to the machine 7.

  The gas-fired hot water machine 7 has a configuration in which start / stop control is performed based on temperature information indicated by the temperature detector 9 and combustion output is further controlled based on temperature information indicated by the temperature detector 44. For example, if the temperature detector 9 indicates 60 ° C. or lower and the temperature indicated by the temperature detector 44 is 55 ° C. or lower, the gas-fired water heater 7 is operated in a high combustion state, and if it is 55 ° C. or higher, the low combustion state It is assumed that the control operated at is performed.

  By being configured in this way, even under a condition in which an operation instruction is given to the gas-fired water heater 7, the combustion state of the water heater 7 is changed according to the hot water temperature of the hot water stored in the hot water storage tank 3. It can be set low, and the operating rate of the gas fired water heater 7 can be reduced.

  Furthermore, it is good also as a structure provided with the buffer tank which stores the low temperature water supplied from the water supply tank 2 in the front | former stage of the heat pump hot-water supply means 4. FIG.

  FIG. 5 is a schematic configuration diagram showing another configuration example of the present embodiment according to the system of the present invention. A system 1d of the present invention shown in FIG. 5 is provided with a buffer tank 51 for storing water between the heat pump hot water supply means 31 and the water supply tank 2 as compared with the system 1b of the present invention shown in FIG. The water stored in is supplied to the heat pump hot water supply means 4 and the hot water storage tank 3.

  The buffer tank 51 includes a water inlet 54, a water outlet 55, and a water outlet 56. The water inlet 54 is connected to the pipe 21, and low-temperature water from the water supply tank 2 flows into the water inlet. The water outlet 55 is connected to the water inlet 31 of the heat pump hot water supply means 4 by a pipe 52, and the water discharged from the water outlet 55 is supplied from the water inlet 31 to the heat pump hot water supply means 4. Further, the water outlet 56 is connected to the water inlet 33 of the hot water storage tank 3 by a pipe 53, and the water discharged from the water outlet 56 is supplied to the hot water storage tank 3 from the water inlet 33. It is assumed that the water inlet 54 and the water outlet 55 are installed in the lower region of the buffer tank 51, and the water outlet 56 is installed in the upper region of the buffer tank 51.

  When comprised in this way, the low temperature water supplied from the water supply tank 2 is supplied to the buffer tank 51 from the water inlet 54 via the piping 21, and is stored in the said tank. The stored low-temperature water is supplied from the water outlet 55 to the water inlet 31 of the heat pump hot water supply means 4 via the pipe 52 and from the water inlet 56 to the water inlet 33 of the hot water storage tank 3 via the pipe 53. The That is, by installing the buffer tank 51, particularly when the hot water supply load is small, the temperature of the water flowing into the water inlet 31 of the heat pump hot water supply means 4 is reliably equal to the water temperature of the water stored in the water supply tank 2. Can be in a state. As described above, since the efficiency of the heat pump hot water supply means 4 increases as the temperature of the input water is lower, the system of the present invention system 1d shown in FIG. be able to.

  Further, in the configuration of the present system 1 d, the water stored in the lower region of the hot water storage tank 3 is supplied to the buffer tank 51 via the pipe 53 from the outlet (inlet / outlet outlet) 33 by operating the circulation pump 42 when there is no load. Supply to a water inlet (inlet / outlet) 56. On the other hand, the water stored in the lower region of the buffer tank 51 is supplied from the outlet 55 to the heat pump hot water supply means 4 via the pipe 52, and the heated hot water is installed in the upper area of the hot water tank 3 via the pipe 41. Supplied from the water inlet 37. In this way, even when there is no load, water (hot water) circulates and the heat pump hot water supply means maintains operation, and the hot water stored in the hot water storage tank 3 is maintained at a certain temperature or higher.

  The lower region of the hot water storage tank 3 is composed of low temperature water, and the water inlet 56 flowing into the buffer tank 51 is installed in the upper region of the buffer tank 51, while the heat pump hot water supply means 4 includes the buffer tank 51. Since the water is supplied from the water inlet 55 installed in the lower region, the temperature of the water supplied to the heat pump hot water supply means 4 can be substantially maintained at the temperature of the water stored in the water supply tank 2.

  In addition, by providing a plurality of buffer tanks, the temperature of the water supplied to the water inlet 31 of the heat pump hot water supply means 4 can be made closer to the temperature of the water stored in the water supply tank 2.

  The system 1e shown in FIG. 6 is configured to include a plurality of buffer tanks. The system 1e further includes buffer tanks 61 and 62 in addition to the buffer tank 51 provided in the system 1d shown in FIG. 5, and these are serially connected.

  That is, the water outlet 66 of the buffer tank 51 and the water inlet 68 of the buffer tank 61 are connected by the pipe 63, and the water outlet 67 of the buffer tank 61 and the water inlet 69 of the buffer tank 62 are connected by the pipe 64. A water outlet 70 of 62 and a water inlet 33 of the hot water storage tank 3 are connected by a pipe 65.

  The low temperature water supplied from the water supply tank 2 is stored in the buffer tank 51, and the stored low temperature water is supplied from the buffer tank 51 to the heat pump hot water supply means 4. When the amount of water supplied from the water supply tank 2 exceeds the amount of water stored in the buffer tank 51, the water is sequentially stored in the buffer tanks 61 and 62, and the water is stored in the hot water storage tank 3 from the outlet 70 of the buffer tank 62. Water is supplied.

  On the other hand, in the circulation state when there is no load, the hot water stored in the hot water storage tank 3 flows into the buffer tank 62 through the pipe 65, and the water pushed out from the water outlet (in / out water inlet) 69 of the buffer tank 62 is discharged. Water that flows into the buffer tank 61 through the pipe 64 and is pushed out from the water outlet (in / out water inlet) 68 of the buffer tank 61 flows into the buffer tank 51 through the pipe 63, and the water outlet (in / out water inlet) of the buffer tank 51. ) The water pushed out from 55 is supplied to the heat pump hot water supply means 4 through the pipe 52.

  By being configured in this way, since the hot water supplied from the hot water storage tank 3 and the low temperature water supplied from the water supply tank 2 are not directly mixed, the low temperature state of the water stored in the buffer tank 51 is further maintained. Thus, the efficiency of the heat pump hot water supply means 4 can be further improved. Further, by providing a plurality of buffer tanks, the capacity of the hot water storage tank 3 can be substantially increased. In this case, the buffer tanks 61 and 62 can be regarded as hot water storage tanks from a different viewpoint, that is, the hot water storage tanks are connected in multiple stages serially, and the tank connected to the hot water storage tank storing the coldest water is buffered. A system configured as a tank may be used.

  In the above description, the gas water heater / heater 7, the circulation pump 11, the heat pump hot water supply means 4, and the circulation pump 42 are individually configured to perform start / stop control based on temperature information from the temperature detector. Control means for receiving temperature information from the detector may be provided outside, and start / stop control of the gas tank water heater 7, the circulation pump 11, the heat pump hot water supply means 4, and the circulation pump 42 may be performed by the control means. Absent.

  FIG. 7 is another schematic configuration diagram according to the second embodiment of the system of the present invention. A system 1 f shown in FIG. 7 has a control unit 8, and the control unit 8 controls the start and stop of the gas water heater 7, the circulation pump 11, the heat pump hot water supply unit 4, and the circulation pump 42.

  The control means 8 controls the start and stop of the gas water heater 7 and the circulation pump 11 based on the temperature information from the temperature detector 9, while the heat pump hot water supply means 4 and the circulation based on the temperature information from the temperature detector 43. This is a configuration for performing start / stop control of the pump 42. The only difference from the system 1b shown in FIG. 3 is that the control means 8 is provided outside, and the control content is the same, so that the description thereof is omitted.

  Further, by providing the control means 8 outside as described above, it is possible not only to instruct the gas fired water heater 8 to perform binary control of operation / stop, but also to perform complicated control such as output adjustment instruction. It is. For example, it is good also as a structure which the control means 8 performs multistage control with respect to the gas fired water heater 7 based on the temperature information of the temperature detector 9. FIG. With this configuration, the same effect as that of the system 1c (see FIG. 4) described above can be obtained.

<Third Embodiment>
A third embodiment of the present invention (hereinafter referred to as “this embodiment” as appropriate) will be described below with reference to the drawings. In the present embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 8 is a schematic diagram showing the configuration of the system 1g of the present invention in the present embodiment. In the present embodiment, the heat pump hot water supply means 4 and the circulation pump 42 are started and stopped based on the temperature information of the temperature detector 43 under the same configuration as the piping configuration of the first embodiment, as in the second embodiment. The configuration is controlled.

  That is, the system 1g of the present invention shown in FIG. 8 has a configuration in which the temperature detector 43 is added to the system 1a of the present invention shown in FIG.

  In the case of such a configuration, as in the first embodiment, since the hot water heated by the heat pump hot water supply means 4 is supplied in advance to the gas water heater 7, it is supplied to the water inlet 35 of the gas water heater 7. The temperature of the hot water to be raised rises as compared with the second embodiment, thereby reducing the amount of heat exchange of the gas-fired hot water machine 7, thereby improving the efficiency of the entire system.

  On the other hand, as in the second embodiment, the gas fired hot water machine 7 and the heat pump hot water supply means 4 are both configured to be controlled by the hot water temperature of the hot water stored in the hot water storage tank 3, and By performing control so that the heat pump hot water supply means 4 is preferentially operated as compared with the hot water machine 7, the high efficiency heat pump hot water supply means 4 is preferentially operated as compared with the first embodiment. Can improve the efficiency of the entire system.

  In the configuration of the present embodiment, the hot water temperature of the heat pump hot water supply means 4 may be set to a temperature (for example, 60 ° C.) higher than the set temperature of the first embodiment. By doing in this way, even when only the heat pump hot water supply means 4 is operating when the gas fired water heater 7 is not in operation, high temperature hot water is supplied to the water inlet 37 of the hot water storage tank 3.

  In this embodiment, the same configuration as that of the examples corresponding to the systems 1c to 1f described in the second embodiment can be used.

  Further, in each of the above-described embodiments, when the hot water supply load 5 is a circulation load, the water inlet 39 when it flows into the hot water storage tank again is installed at a position below the water inlet 37 into which heated hot water flows. It does n’t matter. The hot water output from the hot water storage tank 3 is high temperature, but the temperature is lowered by passing through the pipe 27 and the pipe 28, so that it is lower than the hot water flowing in from the water inlet 37. With such a configuration, the temperature of the hot water flowing out from the water outlet 38 of the hot water storage tank 3 can be maintained at a high temperature.

  The hot water supply system according to the present invention can be used for a heat pump hot water supply system, can maintain high energy efficiency of the heat pump hot water supply system, and can automatically respond to instantaneous hot water supply to a high hot water load. It is possible to provide a hot water supply system capable of increasing the hot water supply pressure.

The schematic block diagram in 1st Embodiment of the hot-water supply system which concerns on this invention Another schematic block diagram in 1st Embodiment of the hot water supply system which concerns on this invention Schematic block diagram in 2nd Embodiment of the hot water supply system which concerns on this invention Another schematic block diagram in 2nd Embodiment of the hot water supply system which concerns on this invention Another schematic block diagram in 2nd Embodiment of the hot water supply system which concerns on this invention Another schematic block diagram in 2nd Embodiment of the hot water supply system which concerns on this invention Another schematic block diagram in 2nd Embodiment of the hot water supply system which concerns on this invention Schematic block diagram in 3rd Embodiment of the hot water supply system which concerns on this invention Schematic configuration diagram of a conventional hot water supply system Another schematic configuration diagram of a conventional hot water supply system

Explanation of symbols

1a, 1a ′, 1b, 1c, 1d, 1e, 1f, 1g: Hot water supply system 1h, 1i of the present invention: Conventional hot water supply system 2: Water supply tank 3: Hot water storage tank 4: Heat pump hot water supply means 5: Hot water supply load 6: Circulation Pump 7: Gas fired water heater
8: Control means 9: Temperature detector 11: Circulation pump 12: Check valves 21, 22, 23, 24, 25, 26, 27, 28: Pipes 31, 32, 33, 34, 35, 36, 37, 38 39: Inlet / outlet port 41: Pipe 42: Circulation pump 43, 44: Temperature detector 51: Buffer tank 52, 53: Pipe 54, 55, 56: Inlet / outlet port 61, 62: Buffer tank 63, 64, 65: Pipe 66 , 67, 68, 69 Entrance / exit

Claims (9)

A heat pump hot water supply means for exchanging heat with the heat of condensation from the condenser of the heat pump circuit and heating the water to supply hot water;
A hot water storage tank for storing hot water and supplying the stored hot water to a hot water supply load;
An auxiliary hot water supply means for heating the hot water supplied from the hot water storage tank and then supplying the hot water storage tank again,
The hot water heated by the heat pump hot water supply means is directly supplied to the auxiliary hot water supply means, or the hot water heated by the heat pump hot water supply means is stored in the hot water storage tank, and then the auxiliary hot water supply means is supplied from the hot water storage tank to the auxiliary hot water supply means. A hot water supply system characterized in that hot water is supplied. Low temperature water supplied from a water supply source is configured to be able to supply the heat pump hot water supply means and the hot water storage tank,
The hot water supply system according to claim 1, wherein the heat pump hot water supply means supplies the hot water to the hot water storage tank after heating the supplied low temperature water. Low temperature water supplied from a water supply source is configured to be able to supply the heat pump hot water supply means and the hot water storage tank,
The hot water supply system according to claim 1 or 2, wherein the heat pump hot water supply means heats the supplied low temperature water, and then supplies hot water to the auxiliary hot water supply means. The auxiliary hot water supply means and the heat pump hot water supply means are configured such that start / stop control is performed according to the temperature of hot water stored in the hot water storage tank,
The hot water supply system according to claim 2, wherein control is performed such that the heat pump hot water supply means is operated with priority over the auxiliary hot water supply means.   5. The hot water supply system according to claim 4, wherein the auxiliary hot water supply means controls the combustion output in a plurality of stages according to the temperature of the hot water stored in the hot water storage tank. The hot water storage tank has a water inlet through which the low temperature water enters and a water outlet from the auxiliary hot water supply means in a lower region, and a water inlet through which hot water supplied from the auxiliary hot water supply enters, the heat pump hot water supply A water inlet from which hot water supplied from the means enters, and a water outlet from which the hot water is discharged with respect to the hot water supply load in the upper region,
The auxiliary hot water supply means is controlled to start and stop in accordance with the temperature of the hot water at the first temperature detection position in the hot water storage tank, and the heat pump hot water supply means is a second lower than the first temperature detection position in the hot water storage tank. The hot water supply system according to claim 4 or 5, wherein the on / off control is performed according to the temperature of hot water at the temperature detection position.   A buffer tank for storing the low-temperature water supplied from the water supply source is provided in front of the heat pump hot water supply means and the hot water storage tank, and the low temperature water discharged from the buffer tank is supplied to the heat pump hot water supply means and the hot water storage tank. It is the structure supplied, The hot water supply system of any one of Claims 1-6 characterized by the above-mentioned.   The heat pump hot water supply means absorbs the heat energy of the outside air and uses it for heating water, and is configured to be installed close to the auxiliary hot water supply means so as to be able to absorb heat radiation from the auxiliary hot water supply means. The hot water supply system according to any one of claims 1 to 7, characterized in that:   The hot water supply system according to claim 8, wherein the heat pump hot water supply means and the auxiliary hot water supply means are installed in the same casing.