JPS61153437A - Waste heat retrieving hot-water supplier - Google Patents

Abstract

PURPOSE:To permit to retrieve waste heat without consuming electric power by exchanging heat arbitrarily between a hot-water reserving tank and a bathtub. CONSTITUTION:When first three-way valve 19 is opened to a side connecting a liquid reserving tank 10 to second heat exchanger 3 and the second three-way valve 24 is opened to a side connecting a branch pipe 25, the waste heat in the bathtub 4 is retrieved by the third heat exchanger 5 and is accumulated in a low temperature portion at the lower part of the hot-water reserving tank 1 by dissipating it through the second heat exchanger 3. Operating liquid 11 circulates through the liquid reserving tank 10, third sending pipe 22, the third heat exchanger 5, third return pipe 23 and a branch pipe 24 and also circulates through the liquid reserving tank 10, first sending pipe 17, second sending pipe 21, the second heat exchanger 3, second return pipe 20, a liquid chamber 14, a return pipe 27 and a non-return valve 26, therefore, the transfer of heat may be effected without consuming external energy such as the electric power or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat recovery water heater having heating and exhaust heat recovery functions, which is applied to bath water supply and the like.

BACKGROUND ART As shown in FIG. 2, a conventional waste heat recovery water heater of this type has a hot water tank heat exchanger 3 (second heat exchanger) installed below a heating section 2 installed inside a hot water tank 1. The bathtub 4 is connected to a bath heat exchanger 5 (third heat exchanger) provided externally through a pump 6 and an outgoing pipe 7 and a returning pipe 8. In this configuration, hot water is supplied from the hot water storage tank 1 to the bathtub 4, and after taking a bath,
The pump 6 was operated, the heat in the bathtub 4 was obtained by the bath heat exchanger 5, and the heat was radiated to the lower low temperature region of the hot water tank 1 by the hot water tank heat exchanger 3.

Problems to be Solved by the Invention However, with the above configuration, if a person wants to take a bath again after exhaust heat recovery, the hot water in the bathtub must be thrown away. Furthermore, there were other problems such as the need to consume electric power with the pump in order to recover the exhaust heat.

The present invention solves such conventional problems, and aims to improve economic efficiency and usability by recovering waste heat without consuming electricity and arbitrarily exchanging heat between the hot water tank and the bathtub. do.

Means for Solving the Problems In order to solve the above problems, the waste heat recovery water heater of the present invention includes a first heat exchanger above the heating section in the hot water storage tank and a second heat exchanger below. At the same time, a liquid storage tank is provided above the hot water storage tank, and a third heat exchanger is provided below the liquid storage tank.The liquid storage tank is further provided above the liquid storage tank and consists of a liquid chamber and a steam chamber, and is provided within the liquid chamber. The control tank is equipped with a valve that communicates the liquid chamber and the vapor chamber by means of a liquid level detection means. The piping connecting each element device includes a first outgoing pipe and a first returning pipe that connect the lower part of the liquid storage tank and the first heat exchanger, and a second outgoing pipe that branches from the first outgoing pipe via a first three-way valve. A second outgoing pipe connected to the heat exchanger, a second returning pipe connecting the second heat exchanger and the liquid chamber, and a third outgoing pipe connecting the lower part of the liquid storage tank and the third heat exchanger. , a third return pipe that connects the third heat exchanger and the heat chamber, a branch pipe that connects the a-th return pipe to the liquid storage tank via the second three-way valve, and the upper part of the liquid storage tank and the steam chamber. It consists of a connecting pipe and a return pipe that connects the lower part of the liquid chamber and the upper part of the liquid storage tank via a check valve.

Effect: With the above-described configuration, the present invention recovers waste heat using the third heat exchanger during waste heat recovery, radiates the heat using the second heat exchanger provided below the heating of the hot water storage tank, and stores the heat in the hot water storage tank. . At this time,
The second three-way valve is opened to the branch pipe side, and the working fluid vapor heated and evaporated in the third heat exchanger passes through the branch pipe from the third return pipe, heats the inside of the liquid storage tank, and the low-temperature working fluid flows into the third It passes through the outgoing pipe and flows into the third heat exchanger again. On the other hand, the working fluid in the heated fluid tank evaporates and the pressure increases. By keeping the first three-way valve open to the second heat exchanger side, the high-temperature working fluid is sent to the second heat exchanger through the second return pipe, radiates heat to the hot water tank, and is exchanged with the low-temperature working fluid. and flows into the liquid chamber of the control tank. When the liquid level detection means detects that a certain amount of hydraulic fluid has been stored in the liquid chamber and the valve is opened, high-pressure steam in the liquid level tank is introduced from the steam chamber into the liquid chamber, causing the hydraulic fluid to rise due to its own weight. flows from the liquid chamber into the liquid storage tank.

Furthermore, by opening the first three-way valve to the liquid storage tank and the first heat exchanger side, and opening the second three-way valve to the first heat exchanger and liquid chamber side, the high-temperature water stored in the upper part of the hot water storage tank can be removed. Heat can be extracted from the hot water through the first heat exchanger and radiated from the third heat exchanger.

Example Embodiments of the present invention will be described below based on the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a hot water storage tank, in which a first heat exchanger 9 is installed above a heating section 2, and a second heat exchanger 3 is installed below. 5 is a third heat exchanger installed externally in the bathtub 4. Reference numeral 10 denotes a liquid storage tank for storing a working liquid 11 as a latent heat medium, and a float 1 serving as liquid level detection means for opening and closing the valve 12 is provided above.
A control tank 16 is provided, which includes a liquid chamber 14 in which a hydraulic fluid 3 is installed, and a steam chamber 15 in which vapor of the working fluid 11 is stored.

The first heat exchanger 9 and the liquid storage tank 1o are connected by a first outgoing pipe 17 and a first returning pipe 18, and a second outgoing pipe 2o is branched from the first outgoing pipe 17 via a first three-way valve 19. and is connected to the second heat exchanger 3, and the second heat exchanger 3 is connected to the liquid chamber 14 by a second return pipe 21. The liquid storage tank 1o and the third heat exchanger 5 are connected by a first outgoing pipe 17, and the third heat exchanger 5 is connected to the liquid storage tank 10 by a first return pipe 18. The third return pipe 2a is provided with a second three-way valve 24 and is branched and connected to the liquid storage tank 10 via a branch pipe 25. On the other hand, the bottom part' of the liquid chamber 14 of the control tank 16 and the liquid storage tank 10 are connected by a return pipe 27 via a check valve 26, and the upper part of the liquid storage tank 1° and the vapor chamber of the control tank 16 are connected. 15 through a communication pipe 28. 29 is a hot water supply pipe from the storage tank 1 to the bathtub 4;
is a valve. Note that the same members as in FIG. 2 are given the same numbers.

In the above configuration, a hot water supply pipe 29 is connected from the hot water storage tank 1 to the bathtub 4.
When hot water is supplied and the temperature of the water in the bathtub 4 drops during bathing, heat is obtained from the high temperature section above the hot water tank 1 by the first heat exchanger 9 and transferred to the third heat exchanger 5. - The hot water in the bathtub 4 can be heated to a predetermined temperature. At this time,
Since the first three-way valve 19 is open in the direction of connecting the liquid storage tank 10 and the first heat exchanger 9, the vapor of the working fluid 11 heated and evaporated in the first heat exchanger 9 is transferred to the first return pipe 18. The low-temperature working fluid 11 passes through the first outgoing pipe 17 and flows into the first heat exchanger 9 again to be circulated. The pressure inside the heated soot storage tank 10 increases, and the high temperature working fluid 11 is forced to be sent to the third heat exchanger 5 through the third outgoing pipe 22.

By setting the second three-way valve 24 to the side that opens the third heat exchanger 5 and the liquid chamber 14, heat is radiated to the bathtub 4 by the third heat exchanger 5, and the working liquid 11 which has become low temperature is transferred to the liquid chamber 14. will be introduced in When the liquid level of the working fluid 11 in the liquid chamber 14 rises, the float 13 also rises, pushing up the valve 12 and causing the liquid chamber 14 and the steam chamber 1 to rise.
5, the vapor of the working fluid 11 in the liquid storage tank 10 passes through the communication pipe 28 to the liquid chamber 14 of the control tank 16.
The pressures in the liquid storage tank 10 and the liquid chamber 14 become approximately the same. Therefore, the hydraulic fluid 11 in the fluid chamber 14 is dropped into the fluid storage tank 10 through the return pipe 27 and the check valve 26 due to its own weight. When the liquid level of the hydraulic fluid 11 in the liquid chamber 14 decreases, the float 13 also decreases, the valve 12 is closed, and the low-temperature hydraulic fluid 11 passes through the third return pipe 23 again to the liquid chamber 1.
It flows into 4. Due to the flow of the above-mentioned hydraulic fluid 11,
The heat in the hot water storage tank 1 is carried into the bathtub 4, and the temperature of the water in the bathtub 4 can be increased. Furthermore, in order to control the temperature to a predetermined temperature, a valve 30 is provided on the third outgoing pipe 22 or the first returning pipe 18 connected to the third heat exchanger 5, and the temperature can be controlled to a desired temperature by controlling opening and closing. can. On the other hand, after bathing, the first three-way valve 19 is connected to the liquid storage tank 10 and the second heat exchanger 3.
The bathtub 4 The exhaust heat inside is recovered by the third heat exchanger 5,
The hot water is stored in the lower low-temperature part of the hot water storage tank 1 by radiating heat from the second heat exchanger 3.

At this time, the flow of the working fluid 11 circulates between the liquid storage tank 10, the third outgoing pipe 22, the third heat exchanger 5, the third return pipe 22, and the branch pipe 24. and the first
Outgoing pipe 17, second outgoing pipe 21, second heat exchanger 3, and second returning pipe 2
By circulating between the liquid chamber 14, the return pipe 27, and the check valve 26, heat can be transferred without consuming external energy such as electric power.

Effects of the Invention As described above, the exhaust heat recovery water heater of the present invention provides the following effects.

(1) In the hot water storage tank, a first heat exchanger is installed above the heating section, that is, a high-temperature section, to take out heat, and a second heat exchanger is installed below the heating section, that is, a low-temperature section, for recovering heat. Because of this, heat can be taken out and recovered as desired, making it easy to use.

■ It is possible to reheat the bathtub even after it has been filled with hot water, and even if you want to take a bath again after recovering the waste heat, you can reheat the bathtub without draining the hot water, making it an economical water heater. can do.

■ It is economical because it recovers waste heat and does not use equipment that consumes electricity such as pumps.

2) Because it does not use equipment with high-speed rotating parts such as pumps, it has low noise and high reliability.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an exhaust heat recovery water heater according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of a conventional exhaust heat recovery water heater. 1... Hot water storage tank, 2-... Heating section, 3...
・・21st A exchanger, 5・・ 3rd heat exchanger, 9 ・・
First heat exchanger, 10... Liquid storage tank, 11...
... Hydraulic fluid, 16 ... Control tank, 19 ... First three-way valve, 24 ... Second three-way valve, 26 ...
non-return valve.

Claims (1)

[Claims] a hot water storage tank that includes a first heat exchanger provided above the heating section and a second heat exchanger provided below the heating section;
a liquid storage tank provided above the hot water storage tank for storing a working fluid of a latent heat medium; and a third liquid storage tank provided below the liquid storage tank.
A control comprising a heat exchanger, and a valve that is provided above the liquid storage tank and is separated into a liquid chamber and a vapor chamber, and communicates and closes the liquid chamber and the vapor chamber by a liquid level detection means in the liquid chamber. a first outgoing pipe and a first returning pipe that connect the lower part of the anchorage tank and the first heat exchanger, and a second heat exchanger that branches from the first outgoing pipe via a first three-way valve. a second return pipe that connects the second heat exchanger and the liquid chamber; and a third return pipe that connects the lower part of the liquid storage tank and the third heat exchanger. a third return pipe connecting the third heat exchanger and the liquid chamber; a branch pipe connecting the third return pipe to the liquid storage tank via a second three-way valve; and an upper part of the liquid storage tank. An exhaust heat recovery water heater comprising a communication pipe connecting the liquid chamber and the steam chamber, and a return pipe connecting the lower part of the liquid chamber and the upper part of the liquid storage tank via a check valve.