JP5975372B2 - Instant hot water system - Google Patents

Description

  The present invention relates to an immediate hot water system capable of performing immediate hot water.

  Conventionally, there is an instant hot water system that can perform an instant hot water that immediately drains hot water at the time of hot water. In this instant hot water system, hot water in the hot water storage tank is circulated in a pipe connecting the hot water terminal and the hot water storage tank so that the hot water temperature in the pipe is kept at a high temperature (see, for example, Patent Document 1). ).

  As shown in FIG. 6, this type of instant hot water system 60 includes a circulation pipe 63 that connects a hot water storage tank 62 and a portion near a hot water faucet on the outlet terminal side of the hot water supply pipe 61. In the instant hot water system 60, when the water temperature inside the hot water supply pipe 61 is lowered, the circulation pump 64 is operated to circulate hot water stored in the hot water storage tank 62 that has been boiled up in the circulation pipe 63 using the heat pump 65. Let For this reason, in the immediate hot water system 60, even when hot water is not used for a long time, the hot water can be immediately discharged from the hot water terminal.

JP 2008-157551 A

  However, in the conventional hot water system, since the hot water is circulated for the hot water, the hot water remaining in the pipe returns directly to the hot water storage tank. For this reason, the medium temperature water stored in the hot water storage tank increases, and the heat pump boils hot water from the medium temperature water circulated from the hot water storage tank, and there is a problem that the thermal efficiency at the time of boiling decreases.

  The present invention has been made in view of the above problems, and provides an immediate hot water system that prevents a decrease in thermal efficiency at the time of boiling in a heat pump even when performing circulating operation of hot water for immediate hot water. Objective.

In order to achieve the above object, the present invention has a circulation pipe that branches from a hot water supply pipe and returns to a hot water storage tank, and in an immediate hot water system that performs an immediate hot water circulation operation using a circulation pump installed in the circulation pipe, in the middle of the circulation pipe, with a heat utilizing device that utilizes the hot water heat passing through the said circulation pipe, the heat utilizing device utilizes the hot water that is circulated in the circulation pipe for immediate hot water as a heat source equipment , and the to return to the hot water storage tank from lowering the temperature of the hot water water by utilizing hot water heat circulating, further comprising a heat pump for heating the water circulating from the hot water storage tank, the heat pump, the heat utilization It is characterized by boiling water whose temperature has decreased after being used as a heat source in equipment .

  In the instant hot water system, the heat utilization device is preferably a snow melting panel that can be used for melting snow.

  In the instant hot water system, the heat utilization device is preferably a hot water radiation panel that can be used as a heat source for heating.

  In the instant hot water system, the heat utilization device is preferably a heat exchanger capable of radiating heat to the hot water storage tank.

  Moreover, in the instant hot water system, it is preferable that the heat utilization device is another pipe arranged in contact with or adjacent to the circulation pipe for preventing freezing.

  In the instant hot water system, it is preferable that a switching valve capable of switching between a route using the heat-using device and a route not using the heat-using device is further provided in the circulation pipe.

  According to the instant hot water system according to the present invention, a heat utilization device that utilizes the heat of hot water is provided in the middle of the circulation pipe, and the hot water is circulated in order to cool the hot water and return it to the hot water storage tank. In particular, it is possible to prevent a decrease in thermal efficiency during boiling in the heat pump.

The block diagram of the instant hot water system which concerns on one Embodiment of this invention. The block diagram of the instant hot water system which concerns on the modification 1 of embodiment. The block diagram of the instant hot water system which concerns on the modification 2 of embodiment. The block diagram of the instant hot water system which concerns on the modification 3 of embodiment. The block diagram of the instant hot water system which concerns on the modification 4 of embodiment. The block diagram of the conventional instant hot water system.

An instant hot water system according to an embodiment of the present invention will be described with reference to the drawings.
The instant hot water system 1 according to the present embodiment includes a hot water storage tank 2 for storing hot water, a medium hot water use device (heat use device) 3, a hot water circulation pump 4, an on-off valve 5, and a check valve 6. . The instant hot water system 1 has a hot water circulation path comprising a hot water storage tank 2, a hot water supply pipe 7, and a circulation pipe 8 that branches from the hot water supply pipe 7 and returns to the hot water storage tank 2 as indicated by the dotted arrows in FIG. In addition, the hot water circulation operation is performed using the circulation pump 4 installed in the circulation pipe 8. With this function, hot water in the hot water supply pipe 7 and the circulation pipe 8 can be kept at a predetermined temperature or more, and hot water can be immediately discharged from the hot water outlet terminal.

  The hot water storage tank 2 has a function of supplying water to the heat pump 9 that is a heat source device and storing hot water heated by the heat pump 9 using a heat insulating material while keeping the temperature warm. Hot water is discharged from the upper layer in the hot water storage tank 2 to the hot water supply pipe 7, mixed with water from the water supply pipe, and supplied to the hot water outlet terminal at a predetermined temperature. When hot water is discharged from the upper layer portion of the hot water storage tank 2, water is supplied to the lower layer portion of the hot water storage tank 2 by the amount of the hot water. The hot water storage tank 2 is provided with a plurality of temperature sensors from the upper part to the lower part of the side wall that measure the temperature by utilizing the electrical resistance of a semiconductor or the like that changes with temperature.

  The medium temperature water utilization device 3 is a device that uses medium temperature water circulating through the circulation pipe 8 as a heat source, and is, for example, a snow melting panel or a warm water radiation panel for floor heating. By using the heat of the hot water circulating in the intermediate-temperature water use device 3, the temperature of the intermediate-temperature water can be lowered and returned to the hot water storage tank 2.

  The circulation pump 4 is a pump for circulating hot water in the circulation pipe 8, and when the circulation pump 4 is driven, water in the circulation path is converted into hot water in the hot water storage tank 2 with relatively high temperature. Can warm up. The on-off valve 5 is a valve body that rotates to open and close the flow path of the circulation pipe 8. The check valve 6 is attached to the circulation pipe 8 and prevents hot water from flowing from the hot water storage tank 2 through the circulation pipe 8 to the hot water outlet terminal.

The heat pump (heating source) 9 is a heat exchange type electric water heater using a natural refrigerant (CO ₂ ), transfers the heat of the atmosphere to the natural refrigerant, and heats the water circulating from the hot water storage tank 2 with the heat. The heat pump 9 has a pump that sends heated hot water to the hot water storage tank 2, and the heated hot water is stored in the hot water storage tank 2.

  With this configuration, the medium-temperature water use device 3 can use the heat amount of the medium-temperature water that is circulated for immediate hot water, and the immediate water system 1 has a sufficiently reduced temperature after being used as a heat source by the medium-temperature water use device 3. The returned water can be returned to the hot water storage tank 2. Therefore, in the instant hot water system 1, even when the intermediate temperature water is circulated for the instant hot water, the hot water storage tank 2 is prevented from accumulating the intermediate temperature water and the heat efficiency at the time of boiling the water in the heat pump 9 can be improved. it can.

(First modification)
A first modification of the present embodiment will be described with reference to FIG. The immediate hot water system 1 according to the first modification includes a switching valve 10 that switches to a route that uses or uses a medium hot water device in the middle of the circulation pipe 8 and a snow melting panel 11. In addition, about the structure similar to the instant hot water system 1 which concerns on the said embodiment, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  In the first modification, when the snow melting is necessary, such as in winter, the switching valve 10 is switched to a path where the snow melting panel 11 can be used, so that the warm water in the circulation pipe 8 is used as a heat source for the snow melting of the snow melting panel 11. Then, the water whose temperature has decreased can be returned to the hot water storage tank 2. On the other hand, when the heat supply to the snow melting panel 11 is unnecessary, such as in summer, the switching valve 10 is switched to a path that does not use the snow melting panel 11.

  With this configuration, in the first modification, by using the medium-temperature water that is circulated by instant hot water as a heat source for the snow melting panel 11, the water whose temperature has been sufficiently lowered is returned to the hot water storage tank 2, thereby boiling the heat pump 9. It is possible to prevent a decrease in thermal efficiency.

(Second modification)
A second modification of the present embodiment will be described with reference to FIG. The immediate hot water system 1 according to the second modification includes a switching valve 10 that switches to a route that uses or uses a medium hot water device in the middle of the circulation pipe 8, and a hot water radiation panel 12 that serves as a heat source for heating. ing. When the floor heating or the like is necessary, medium temperature water that is circulated by switching the switching valve 10 to a path that can use the hot water radiation panel 12 is used to return the water whose temperature is sufficiently lowered to the hot water storage tank 2. it can. On the other hand, when the supply of heat to the hot water radiation panel 12 is unnecessary, the switching valve 10 is switched to a path that does not use the hot water radiation panel 12.

  With this configuration, in the second modification, boiling water in the heat pump 9 is obtained by returning the water whose temperature has sufficiently decreased to the hot water storage tank 2 by using the medium-temperature water that is circulated and operated by instant hot water as the heat source of the hot water radiation panel 12. It is possible to prevent a decrease in thermal efficiency when raising.

(Third Modification)
A third modification of the present embodiment will be described with reference to FIG. The instant hot water system 1 according to the third modification includes a heat exchanger 13 in the middle of the circulation pipe 8. The heat exchanger 13 has a function of dissipating heat obtained from the medium-temperature water passing through the circulation pipe 8 to the hot water storage tank 2, and raises the atmospheric temperature in the hot water storage tank 2 to improve the heat retention performance of the hot water storage tank 2. Can be made.

(Fourth modification)
A fourth modification of the present embodiment will be described with reference to FIG. In the instant hot water system 1 according to the fourth modification, the circulation pipe 8 is disposed in contact with or adjacent to a pipe 14 that may freeze in the hot water storage tank 2 such as a water supply pipe or a mixed hot water supply pipe. With this configuration, in the fourth modification, the heat of the medium-temperature water passing through the circulation pipe 8 can be transferred to the other pipe 14 that may be frozen, and the water passing through the pipe 14 can be prevented from freezing. Also. In the hot water storage tank 2, it is not necessary to provide a heater for preventing freezing of the pipe 14, and the cost can be reduced.

  In addition, this invention is not restricted to the structure of the said embodiment and modification, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the medium hot water utilization device 3 is not limited to the snow melting panel 11 or the hot water radiation panel 12 but may be a geothermal generation device for home gardening.

1 Instant hot water system 2 Hot water storage tank 3 Medium hot water use equipment (heat use equipment)
4 Circulating Pump 5 Open / Close Valve 6 Check Valve 7 Hot Water Supply Piping 8 Circulating Piping 9 Heat Pump 10 Switching Valve 11 Snow Melting Panel 12 Hot Water Radiation Panel 13 Heat Exchanger 14 Piping

Claims (6)

In the hot water system that has a circulation pipe that branches off from the hot water supply pipe and returns to the hot water storage tank, and uses the circulation pump installed in this circulation pipe,
In the middle of the circulation pipe, with a heat utilizing device that utilizes the hot water heat passing through the said circulation pipe, the heat utilizing device utilizes the hot water that is circulated in the circulation pipe for immediate hot water as a heat source is a device, to return to the hot water storage tank from lowering the temperature of the hot water water by utilizing hot water heat circulation,
An immediate hot water system , further comprising a heat pump for heating water circulating from the hot water storage tank, wherein the heat pump boils water having a lowered temperature after being used as a heat source in the heat utilization device .   The instant hot water system according to claim 1, wherein the heat utilization device is a snow melting panel that can be used for melting snow.   The hot water system according to claim 1, wherein the heat utilization device is a hot water radiation panel that can be used as a heat source for heating.   2. The hot water system according to claim 1, wherein the heat utilization device is a heat exchanger capable of radiating heat to the hot water storage tank.   The hot water system according to claim 1, wherein the heat utilization device is another pipe arranged in contact with or adjacent to the circulation pipe to prevent freezing.   The switching valve capable of switching between a path using the heat-using device and a path not using the heat-using device is further provided in the middle of the circulation pipe. The instant hot water system as described in any one of Claims.

Images