JP2005147662A - Hot water supply system using bath heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently recover heat energy in the hot water remaining in a bathtub to save energy, and boil the whole water in a storage tank in a limited time such as in a time late at night to prevent shortage of the hot water. <P>SOLUTION: The hot water supply system using bath heat comprises: a heating means 14 disposed in an upper part of a hot water storage tank 1; a hot water supply pump 15 flowing the water from a lower part to the upper part in the hot water storage tank 1; a heat exchanger 16 disposed in a circulation circuit of the water supply pump 15; a bath heat exchanger 17 having the relation of heat exchange with the heat exchanger 16; and the bathtub 18 communicating with the heat exchanger 17. Therefore, heat energy in the remaining water in the bathtub can be efficiently recovered to save the energy. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water storage hot water supply system using bath heat.

Conventionally, this type of hot water supply system is disclosed in Patent Document 1. Hereinafter, conventional techniques will be described with reference to the drawings. FIG. 6 is a block diagram of a conventional hot water supply system. In FIG. 6, the water in the lower chamber 1 b of the hot water storage tank 1 flows into the heat exchanger 4 by the operation of the hot water supply pump 30, exchanges heat with the remaining hot water in the bathtub 5, and returns to the lower chamber 1 b of the hot water storage tank 1 again. And it is a system which uses the heat of condensation from the compressor 31 to dissipate heat in the condenser 32, heats the water in the upper chamber 1a and the lower chamber 1b of the hot water storage tank 1, and stores hot water.
JP-A-4-106370

  However, in the conventional hot water supply system, the water in the lower chamber 1b in the hot water storage tank 1 that exchanges heat with the remaining hot water in the bathtub 5 is also simultaneously heated by a heat pump. For this reason, when the remaining hot water heat recovery operation is performed in combination with other heat sources such as a heat pump and an electric heater, the water temperature of the lower chamber 1b in the hot water storage tank 1 rises with time, and conversely, the remaining hot water temperature in the bathtub is hot. It is lowered because it is taken away. And since the heating capability of other heat sources is large, the hot water temperature in a hot water storage tank rises rapidly, and reaches the same temperature as the remaining hot water temperature of a bathtub in a short time. Therefore, the hot water remaining in the bathtub cannot be efficiently recovered.

  The present invention solves the above-mentioned problems, efficiently recovers the thermal energy of the remaining hot water in the bathtub, saves energy, and saves the entire hot water storage tank within a limited time, for example, at midnight. The main purpose is to prevent boiling out of hot water.

  In order to solve the above problems, the present invention comprises a heating means provided at the upper part of a hot water storage tank, a hot water supply pump for flowing water from the lower part to the upper part of the hot water storage tank, and a heat exchanger provided in a circulation circuit of the hot water supply pump. A bath heat exchanger having a heat exchange relationship with this heat exchanger and a bath heat utilizing hot water supply system provided with a bathtub communicating with the bath heat exchanger.

  As a result, the water in the hot water storage tank that exchanges heat with the remaining hot water in the bathtub is constantly at the initial water supply temperature. it can.

  Also, heating means provided in the upper part of the hot water storage tank, a hot water supply pump for flowing hot water from the upper part to the lower part of the hot water storage tank, a heat exchanger provided in the circulation circuit of the hot water pump, and a bath having a heat exchange relationship with the heat exchanger A hot water supply system using bath heat is provided with a heat exchanger and a bathtub communicating with the bath heat exchanger.

  Thereby, in the operation which heats and keeps the water in the bathtub, the hot water heated by the heating means is discharged from the upper part of the hot water storage tank to the heat exchanger, and the bathtub water sent from the bathtub is heated. Therefore, since the amount of hot water that can be heated in the bathtub can be used in a short time, the convenience is improved.

  The hot water storage tank is installed in the middle of the connection pipe between the upper part of the hot water tank and the heat exchanger. The flow path switching means for switching the flow path to the lower part of the tank and the flow path from the hot water tank connecting port at a position lower than the height position of the heating means to the lower part of the hot water tank during the bath heat recovery operation. A bath heat-use hot water supply system provided with operation control means for switching the path switching means.

  Thereby, heating of bathtub water, recovery of bathtub remaining hot water heat, and the operation which boils the whole water in a hot water storage tank can be realized with a simple device (single hot water supply pump and flow path switching means).

  As is clear from the above description, according to the first aspect of the invention, it is possible to efficiently recover the thermal energy of the remaining hot water in the bathtub and save energy.

  Moreover, according to the invention of Claim 2, since the amount of hot water which can be heated in a bathtub can be boiled and utilized for a short time, the convenience improves.

  Furthermore, according to the third aspect of the present invention, it is possible to realize the operation of heating the bath water, collecting the remaining hot water of the bath, and boiling the entire water in the hot water storage tank with a simple device.

  The invention according to claim 1 of the present invention comprises a heating means provided at the upper part of the hot water storage tank, a hot water supply pump for flowing water from the lower part to the upper part of the hot water storage tank, a heat exchanger provided in the circulation circuit of the hot water supply pump, This is a hot water supply system using bath heat that has a bath heat exchanger that has a heat exchange relationship with the heat exchanger, and a bathtub that communicates with the bath heat exchanger. Heat exchange is performed to circulate the heated medium temperature water to the upper part of the hot water storage tank. And it heats to high temperature with the heating means of the hot water storage tank upper part. Therefore, since the water in the hot water storage tank that exchanges heat with the remaining hot water in the bathtub is constantly at the initial water supply temperature, the remaining hot water in the bathtub can be recovered to the same temperature as the temperature of the water supply even if the temperature of the remaining hot water in the bathtub drops with the operating time. .

  Further, the invention described in claim 2 is a heating means provided in the upper part of the hot water storage tank, a hot water supply pump for flowing hot water from the upper part to the lower part of the hot water storage tank, a heat exchanger provided in the circulation circuit of the hot water supply pump, This is a hot water supply system using bath heat that has a bath heat exchanger that has a heat exchange relationship with the exchanger and a bath that communicates with the bath heat exchanger, and is heated by heating means in the operation of heating and keeping the water in the bath Hot water is allowed to flow from the upper part of the hot water storage tank to the heat exchanger to heat the bathtub water sent from the bathtub. Therefore, since the amount of hot water that can be heated in the bathtub can be used in a short time, the convenience is improved.

  The invention according to claim 3 is provided in the middle of the connecting pipe between the upper part of the hot water storage tank and the heat exchanger, the flow path from the upper connection port of the hot water storage tank to the lower part of the hot water storage tank, and the height position of the heating means. The channel switching means for switching the channel from the lower hot water storage tank connection port to the lower part of the hot water storage tank, and the hot water storage tank from the hot water tank connection port lower than the height position of the heating means during bath heat recovery operation. It is a hot water supply system using bath heat provided with an operation control means for switching the flow path switching means so as to constitute a flow path to the lower part, and during the heat recovery operation of the bath, the water in the hot water storage tank below the heating means is heat exchanger The remaining hot water in the bathtub is collected and flows from the bottom of the hot water storage tank. Next, at the time of bathtub heating operation, hot water is sent from the upper connection port of the hot water storage tank to the heat exchanger to heat the water in the bathtub. In addition, when there is no remaining hot water in the bathtub, when the water in the hot water tank is boiled, the hot water heated by the heating means passes from the upper part of the hot water tank to the flow path switching means and the heat exchanger to the lower part of the hot water tank. Return and boil the water in the hot water tank. Therefore, the operation of heating the bath water, collecting the remaining hot water of the bathtub, and boiling the entire water in the hot water storage tank can be realized with a simple device (single hot water pump and flow path switching means).

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in a prior art example and each Example, the same code | symbol is attached | subjected about what has the same structure and the same operation | movement, and description is partially abbreviate | omitted.

(Reference Example 1)
FIG. 1 is a configuration diagram of a hot water supply system using bath heat according to the first embodiment. In FIG. 1, reference numeral 1 denotes a hot water storage tank, and 2 denotes a first heating means, which is provided in the upper part of the hot water storage tank 1. 3 is a 2nd heating means, and is provided in the lower part in the hot water storage tank 1. FIG. A heat exchanger 4 is provided below or at least at the same position in the hot water storage tank 1 from the second heating means 3 to exchange heat between the medium in the hot water storage tank 1 and the water in the bathtub 5. Reference numeral 6 denotes detection means, which detects the temperature of the hot water near the heat exchanger 4 in the hot water storage tank 1 and the temperature detection means 7 for detecting the temperature of the hot water in the bathtub flowing into the heat exchanger 4. When the detected temperature of the means 8 reaches a predetermined temperature difference, the end of the heat recovery of the bath remaining hot water is detected. Reference numeral 9 denotes a control means which starts the operation of the first heating means 2 during the heat recovery operation from the remaining hot water in the bathtub, and then receives the signal from the detection means 6 and stops energization of the first heating means 2 and the second heating. The means 3 is energized. Reference numeral 10 denotes a bath pump, which is necessary when the remaining hot water in the bathtub 5 is sent to the heat exchanger 4 and the installation distance between the hot water storage tank 1 and the bathtub 5 is long.

  And it receives the signal of the control means 9 and operates during the heat recovery operation and stops when the heat recovery operation stops.

  The operation and action of the above configuration will be described. In the bath waste heat recovery operation, the upper first heating means 2 is started at the same time as the operation is started, and the water in the upper hot water storage tank 1 is boiled from the first heating means 2. At the same time, the water in the hot water storage tank 1 below the first heating means 2 is boiled to the middle temperature with the remaining hot water in the bathtub 5. When the temperature of the hot water near the heat exchanger 4 in the hot water storage tank 1 and the temperature of the remaining hot water in the bathtub 5 flowing into the heat exchanger 4 reach a predetermined temperature difference, the upper first heating means 2 is deenergized. At the same time, energization of the lower second heating means 3 is started. And the middle temperature water in a hot water storage tank is boiled to high temperature using the 2nd heating means 3 of the lower part. Therefore, when the remaining hot water in the bathtub is heat-recovered, the hot water heated by the heating means and the remaining hot water in the bathtub do not exchange heat, so that heat can be recovered efficiently and energy is saved. In addition, since either the upper or lower heating means is operated simultaneously during the heat recovery operation, the water in the hot water storage tank can be sufficiently boiled within a predetermined time such as midnight.

  Further, as another method of the detecting means 6, a difference between both temperatures is detected from the detected temperature of the temperature detecting means 7 near the heat exchanger 4 at the start of operation and the detected temperature of the remaining hot water temperature detecting means 8 of the bathtub at the start of operation. The same effect can be obtained by calculating in advance the time for the temperature to fall within the predetermined temperature difference, setting it with a timer based on the calculation result, and detecting the end of heat recovery.

(Reference Example 2)
FIG. 2 is a configuration diagram of a hot water supply system using bath heat according to the second embodiment. In FIG. 2, reference numeral 11 denotes hot water temperature detecting means for detecting the hot water temperature at a predetermined amount in the upper part of the hot water storage tank 1. An operation control means 12 receives the signal from the hot water temperature detection means and, when the temperature is equal to or higher than a predetermined temperature, the first heating means 2 and the second heating means 3 are de-energized and heat recovery from the bath remaining hot water is performed. Reference numeral 13 denotes a control unit which starts energization of the second heating unit 3 in response to a signal from the detection unit 6.

  The operation and action of the above configuration will be described. When a predetermined amount of hot water in the upper part of the hot water storage tank 1 is equal to or higher than a predetermined temperature at the start of the heat recovery operation, that is, when a predetermined amount of high temperature hot water is stored in the hot water storage tank 1, the first heating means 2 and The second heating means 3 is de-energized to recover the remaining hot water in the bathtub 5, and the remaining hot water in the bathtub 5 sent to the heat exchanger 4 is lower (lower position) than the hot remaining hot water in the hot water storage tank 1. When the entire amount of supplied water is gradually boiled and the temperature of the hot water in the vicinity of the heat exchanger 4 in the hot water storage tank and the temperature of the remaining hot water in the bathtub 5 flowing into the heat exchanger 4 reaches a predetermined temperature difference, The heating means 3 is energized to boil the medium temperature water in the hot water storage tank 1 to a high temperature. Therefore, even if the operation time of the heating means is short, it can be sufficiently boiled, there is little heat dissipation loss of the hot water in the upper part of the hot water storage tank, and energy saving and lack of hot water amount are achieved.

(Example 1)
FIG. 3 is a configuration diagram of the hot water supply system using bath heat according to the first embodiment of the present invention. In addition, about the structure similar to a reference example, it represents using the code | symbol similar to a reference example.

  In FIG. 3, the flow of water in the hot water storage tank is represented by a solid arrow. Reference numeral 14 denotes a heating means, which is provided in the upper part of the hot water storage tank 1. Reference numeral 15 denotes a hot water supply pump, which causes water to flow from the lower part to the upper part of the hot water storage tank 1. A heat exchanger 16 is provided in the circulation circuit of the hot water supply pump 15. Reference numeral 17 denotes a bath heat exchanger, which has a heat exchange relationship with the heat exchanger 16. Reference numeral 18 denotes a bathtub that communicates with the bath heat exchanger 17.

  The operation and action of the above configuration will be described. In the heat recovery operation, the hot water supply pump 15 is used to send the hot water in the lower part of the hot water storage tank 1 to the heat exchanger 16, and the intermediate hot water heated by exchanging heat with the remaining hot water in the bathtub 5 is circulated to the upper part of the hot water storage tank 1. . And it heats to high temperature with the heating means 14 of the hot water storage tank 1 upper part. Therefore, since the water in the hot water storage tank 1 that exchanges heat with the remaining hot water in the bathtub 5 is constantly at the initial water supply temperature, even if the temperature of the remaining hot water in the bathtub drops with the operation time, the remaining hot water in the bathtub is kept at substantially the same temperature as the water supply temperature. Heat recovery is possible. Therefore, the remaining hot water of the bathtub can be efficiently recovered.

(Example 2)
FIG. 4 is a configuration diagram of a hot water supply system using bath heat according to a second embodiment of the present invention. In addition, about the structure similar to a reference example, it represents using the code | symbol similar to a reference example.

  In FIG. 4, the flow of water in the hot water storage tank is represented by solid arrows. Reference numeral 19 denotes a hot water supply pump for flowing hot water from the upper part to the lower part of the hot water storage tank.

  The operation and action of the above configuration will be described. In the operation of heating and keeping the water in the bathtub 18, the water in the upper part of the hot water storage tank 1 is heated by the heating means 14, and the hot water heated using the hot water supply pump 19 is transferred from the upper part of the hot water storage tank 1 to the heat exchanger 16. Spill. And the bathtub water sent from the bathtub 18 here is heated via the bath heat exchanger 17. Therefore, since the amount of hot water used for bath heating can be boiled and used in a short time, convenience is improved.

(Example 3)
FIG. 5 is a configuration diagram of a hot water supply system using bath heat according to a third embodiment of the present invention. In FIG. 5, the flow of water in the hot water storage tank during the bath heat recovery operation is represented by a solid arrow, and the flow of water in the hot water storage tank during the bath heating operation is represented by a dashed arrow. In addition, the flow of water in the hot water storage tank during the operation of boiling the water in the hot water storage tank when there is no remaining hot water in the bathtub is indicated by the same solid arrow as in the bath heat recovery operation. Reference numeral 20 denotes a flow path switching means, which is provided in the middle of the connection pipe between the upper part of the hot water tank 1 and the heat exchanger 16, the flow path from the upper connection port of the hot water tank 1 to the lower part of the hot water tank 1, The flow path from the hot water storage tank connection port lower than the height position to the lower part of the hot water storage tank 1 is switched. 21 is an operation control means, and the flow path switching means 20 is configured so as to constitute a flow path from the hot water tank connecting port located lower than the height position of the heating means 14 to the lower part of the hot water tank 1 during the bath heat recovery operation. Switch.

  The operation and action of the above configuration will be described. During the bath heat recovery operation, the operation control means 21 switches the flow path switching means 20 from the hot water tank connection port located lower than the height position of the heating means 14 to the lower part of the hot water storage tank 1. And the water in the hot water storage tank below the heating means 14 is sent to the heat exchanger 17 to collect heat from the remaining hot water in the bathtub. And it flows in into a hot water storage tank from the lower part of a hot water storage tank. The temperature in the hot water storage tank below the heating means 14 is gradually raised while repeating this cycle.

  Next, at the time of bathtub heating operation, hot water is sent from the upper connection port of the hot water storage tank to the heat exchanger 16 through the flow path switching means 20 to heat the water in the bathtub. In addition, in the operation of boiling water in the hot water storage tank when there is no remaining hot water in the bathtub, the hot water heated by the heating means 14 passes through the flow path switching means 20 and the heat exchanger 16 from the upper connection port of the hot water storage tank, It flows into the hot water storage tank from the bottom of the hot water storage tank 1. Then, when the surface of the low temperature water in the hot water storage tank 1 rises in the hot water storage tank 1 and reaches the position of the heating means 14, it is heated by the heating means 14 to become hot hot water, and from the upper connection port of the hot water storage tank 1. It flows into the hot water storage tank from the bottom of the hot water storage tank 1. While repeating this cycle, the water in the hot water storage tank 1 is boiled. Therefore, the operation of heating the bath water, collecting the remaining hot water of the bathtub, and boiling the entire water in the hot water storage tank can be realized with a simple device (single hot water pump and flow path switching means).

  The present invention can be applied to a hot water storage hot water supply system using bath heat.

The block diagram of the hot water supply system using bath heat of Reference Example 1 Block diagram of hot water supply system using bath heat of Reference Example 2 1 is a configuration diagram of a hot water supply system using bath heat according to a first embodiment of the present invention. The block diagram of the hot water supply system using bath heat of Example 2 of the present invention The block diagram of the hot water supply system using bath heat of Example 3 of the present invention Configuration diagram of conventional hot water supply system using bath heat

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 1st heating means 3 2nd heating means 4 Heat exchanger 5 Bathtub 6 Detection means 7 Temperature detection means 8 Remaining hot water temperature detection means 9 Control means 10 Bath pump 11 Hot water temperature detection means 12 Operation control means 13 Control means DESCRIPTION OF SYMBOLS 14 Heating means 15 Hot-water supply pump 16 Heat exchanger 17 Bath heat exchanger 18 Bathtub 19 Hot-water supply pump 20 Flow path switching means 21 Operation control means

Claims (3)

Heating means provided in the upper part of the hot water storage tank, a hot water supply pump for flowing water from the lower part to the upper part of the hot water storage tank, a heat exchanger provided in a circulation circuit of the hot water supply pump, and a heat exchange relationship with the heat exchanger A bath-heat-use hot water supply system comprising a bath heat exchanger and a bathtub communicating with the bath heat exchanger. Heating means provided in the upper part of the hot water storage tank, a hot water supply pump for flowing hot water from the upper part to the lower part of the hot water storage tank, a heat exchanger provided in the circulation circuit of the hot water supply pump, and a bath having a heat exchange relationship with the heat exchanger A bath-heat-use hot water supply system having a heat exchanger and a bathtub communicating with the bath heat exchanger. Provided in the middle of the upper part of the hot water storage tank and the connection pipe of the heat exchanger, a flow path from the upper connection port to the lower part of the hot water storage tank, and from the hot water storage tank connection port lower than the height position of the heating means The flow path switching means for switching the flow path of the hot water storage tank and the flow path switching means so as to form a flow path from the connection port of the hot water storage tank at a lower position than the height position of the heating means during bath heat recovery operation. The hot water supply system using bath heat according to claim 2, further comprising operation control means for switching between the two.

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