JPS62190355A - Temperature raising device for bathing water - Google Patents

Abstract

PURPOSE:To recover thermal energy by causing overflow water overflowing a bathtub to stay in a waste hot water tank to absorb heat, and adding the thermal energy of the heat bathtub water into the hot water storage tank. CONSTITUTION:A predetermined quantity of crude water 7 is normally supplied into a hot water storage tank 1. Bathing water 10 stored in the hot water storage tank 1 is fed into a bathtub 2 through a feed pipe 8. When the bathing water overflows the bathtub 2, the overflowing water is fed into a waste hot water tank 3 through an overflow pipe 6 and stored therein. By waste hot water (overflowing water) within the waste hot water tank 3 a low-boiling point coolant within a heat recovering heat exchanger 5 dipped in the waste hot water tank 3 is evaporated. The thus evaporated coolant radiates heat in the shell 4A of a shell tube type heat exchanger 4. The temperature of the coolant falls due to the heat radiation, and this results in raising the temperature of the bathing water 10 within the hot water storage tank 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for heating bath water, and particularly to a method for heating bath water directly with an oil-fired or gas-fired boiler and continuously supplying the same at all times. Concerning bath water heating devices for bathhouses, inns, and hotels.

[Conventional technology]

Generally, in public baths, large public baths in inns, large public baths in hotels, etc., a fixed amount of hot water is always supplied to the bathtub, regardless of whether or not there are bathers. The hot water in these bathtubs is heated directly, except for bathtubs whose source water is high-temperature hot springs. An oil-fired boiler or a gas-fired boiler is installed to heat the bath water.

[Problem that the invention seeks to solve]

In conventional public baths, large public baths in Japanese inns, and large public baths in hotels, hot water is constantly supplied even when no one is bathing, and a certain amount of heated bath water is wasted down the drain. It had been discarded. In addition, there were people taking baths in the bathhouse, and they were disposing of the hot water they used to take a bath down the drain. For this reason, the heating energy for bathtub water that is discarded into the drain is wasted.

For this reason, the recent rise in fuel costs has put pressure on the management of public baths and inns and hotels that own public baths.

[Purpose of the invention]

An object of the present invention is to provide a bath water heating device that can use the energy of overflowing water from a bathtub to contribute to heating the bath water.

[Means for solving problems]

As a result of intensive research into methods of using overflow water as a heat source, the present inventors devised a method of absorbing heat from overflow water overflowing from a bathtub. The heated bath water is added to the bath water in a hot water storage tank containing 16 reservoirs.

That is, the present invention provides a hot water supply system that stores heated bath water in a hot water storage tank and then supplies a certain amount of it into a bathtub.
An overflow pipe that conducts overflow water from the bathtub, and a return tank that temporarily retains the overflow water that has been conducted through the overflow pipe are provided, and a heat exchanger for heat recovery is installed in the return tank. and a shell tube type heat exchanger is connected to the heat recovery heat exchanger so that bath water in the hot water storage tank can be supplied to the shell tube type heat exchanger. be.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the invention.

In the figure, bath water 10 is stored in a hot water storage tank 1 at a constant rate. This hot water storage tank 1 is supplied with heated source water 7 (or as it is in the case of a hot spring) through a pipe. A supply pipe 8 is connected to this hot water storage tank 1.
supplies bath water 10 in a hot water storage tank 1 into a bathtub 2.

The hot water overflowing from the bathtub 2 is supplied through an overflow pipe 6 to a return hot water tank 3 that stores the overflow water. In this return hot water tank 3, a heat exchanger 5 for heat recovery is immersed. Further, a waste water port is provided at the upper part of the return hot water tank 3.

Further, the heat recovery heat exchanger 5 absorbs heat from overflow water flowing from the bathtub 2 that is sent into the return hot water tank 3 using a low boiling point refrigerant contained therein. In addition, this heat recovery heat exchanger 5 includes a shell tube type heat exchanger 4.
shell 4A is connected. A water pipe 4B of the shell tube heat exchanger 4 is integrally formed with the shell 4A of the shell tube heat exchanger 4, and a heat exchanger for heat recovery is connected to the shell 4A of the shell tube heat exchanger 4. 5
The heat energy obtained is transmitted to the water pipe 4B of the shell tube heat exchanger 4. This shell tube type heat exchanger 4 performs a heat dissipation function. The shell tube type heat exchanger 4 is configured so that the bath water 10 in the hot water storage tank 1 circulates through the wooden conduit 4B.

Since it is configured in this way, the source water 7 is fed to the hot water tank 1.
A constant amount is always supplied within the Bath water 10 stored in this hot water storage tank 1 is supplied into the bathtub 2 via a supply pipe 8. When the bath in the bathtub 2 overflows from the bathtub 2, this overflow water is supplied to the return hot water tank 3 via the overflow pipe 6 and stored therein. The return hot water (overflow water) in the return hot water tank 3 causes the return hot water tank 3 to
The low boiling point refrigerant in the heat recovery heat exchanger 5 immersed therein is evaporated. This vaporized refrigerant radiates heat in the shell 4A of the shell tube heat exchanger 4. Due to this heat dissipation method, the temperature of the refrigerant is lowered, and the bath water 1 in the hot water storage tank 1 is heated.
Raise the temperature to 0.

Therefore, according to this embodiment, the conventional bathtub can be heated to 43°C at an appropriate temperature.
An oil-fired boiler or the like is installed to maintain the bathtub at an appropriate temperature, and the thermal energy of the hot water returned from the bathtub (approximately 30°C) can be recovered.

〔Effect of the invention〕

As explained above, according to the present invention, the energy of the water overflowing from the bathtub can be made to contribute to the heating of the bathtub water.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the present invention. 1...Hot water storage tank, 2...Bathtub, 3...Return hot water tap, 4...
... Shell tube type heat exchanger, 5... Heat exchanger for heat recovery, 6... Eddy flow tube.

Claims (1)

[Claims] (1) In a hot water supply system that stores heated bath water in a hot water storage tank and then supplies a certain amount of it into a bathtub, there is an overflow pipe that conducts overflow water from the bathtub, and an overflow pipe that conducts the overflow water. A waste hot water tank is provided in which a predetermined amount of overflow water is temporarily retained, and a heat exchanger for heat recovery is provided in the waste hot water tank, and a shell tube type heat exchanger is connected to the heat recovery heat exchanger. A bath water heating device characterized in that the bath water in the hot water storage tank is configured to be supplied to the tube type heat exchanger.