JPS63306327A - Central hot water supply system - Google Patents

Abstract

PURPOSE:To decrease consumption of power of water pump in the central hot water supply system for multiple dwelling house by connecting a center tank with a buffer tank through the intermediary of a three directional switch valve and a water pump provided in their vicinity respectively, and by switching the three directional switch valve on the side of the center tank at the time of hot water supply load hour 0 to be replaced by hot water at low temperature. CONSTITUTION:When the water level of a buffer tank 4 reaches the upper limit of height hH, the 1st three directional valve 6 and the second three directional valve 8 are switched over, and water from the first three directional valve 6 or such water at low temperature as the one in the lower part are put in water pipes 10, 12 to be substituted with a low temp. water in the inside of the water pipes 10, 12. Therefore, a water pump 7 will stop. The water within the buffer tank 4 is retained at the temperature for hot water supply. Thus, the consumption of power of water pump can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a central hot water supply system used in apartment complexes and the like.

Conventional technology A conventional central hot water system uses a heat source to produce high-temperature hot water, stores the hot water in a center tank, and connects the center tank to the hot water taps of each house through water pipes.
Many systems are used in which hot water is supplied to a hot water faucet using a water pump to cover the hot water supply load.

Problems to be Solved by the Invention However, in this central hot water system, it is necessary to keep the hot water in the water pipes at a high temperature at all times, so even when there is no hot water supply load, the temperature drop of the hot water due to heat radiation from the water pipes is not enough. However, it is necessary to constantly circulate hot water, which leads to problems in that the power consumption of the water pump is large and the amount of heat radiation loss from the water pipes is also large.

The present invention solves the above problems and provides a central hot water supply system that can reduce the amount of power consumed by the water pump.

Means for Solving the Problems The present invention provides a city water switching valve, a three-way switching valve, and a buffer tank in the middle of the water pipe connecting each hot water faucet and the center tank. When there is a hot water supply load, the hot water in the center tank is supplied to the buffer tank by the water pump through the first three-way switching valve and the second three-way switching valve. When there is no hot water supply load, the flow path of the first three-way switching valve is switched to replace hot water in the water pipe with low-temperature water.

In the present invention, by adopting a central hot water system as described above, it is no longer necessary to maintain the hot water in the water pipes at a high temperature when there is no hot water supply load, there is no need to circulate hot water, and the power consumption of the water pump is reduced. By reducing the amount of heat dissipated from the water pipes and replacing the hot water in the water pipes with low-temperature water, the amount of heat radiation loss from the water pipes is reduced.

EXAMPLE Hereinafter, a central hot water supply system according to the present invention will be explained based on the drawings. The figure is a system configuration diagram of an embodiment of the central hot water supply system of the present invention, in which the heat source device 1 and the center tank 2 are connected by a water pipe 3, and the center tank 2 and the buffer tank 4 are connected to each other by an outgoing header 6, First three-way switching valve6.
They are connected via water pump 7, second three-way switching valve 8, and return header 9 by water lines 10, 11.12.

The buffer tank 4 is provided with a heater 13 and further connected to a hot water tap 14.

A city water pipe 16 is connected to the center tank 2 at its lower part.

High-temperature hot water produced by the heat source device 1 is stored in the center tank 2 through a water pipe 3.

When hot water is dispensed from the hot water faucet 14 and the water level in the buffer tank 4 falls below the lower limit height hL, the water pump 7 is operated and the hot water in the center tank 2 is pumped to the outgoing header 5. First three-way switching valve6. Water pump 7, water pipe 1o, second three-way switching valve 8, water pipe 12
, and a closed loop consisting of a return header 9,
When the water temperature in the water pipe 1o is increased and the water temperature in the water pipe 1o near the second three-way switching valve 8 reaches the hot water supply temperature, the second
The flow path of the three-way switching valve 8 is switched, hot water is supplied to the buffer tank 4 through the water pipe 11, and the supplied city water enters the center tank 2 through the city water pipe 16.

When warm water is supplied to the buffer #vi4 and the water level rises to exceed the upper limit height h□, the flow paths of the first three-way valve 6 and the second three-way valve 8 are switched, and the city water is supplied from the first three-way valve 6. Alternatively, low-temperature water such as water from the lower layer of the center tank 2 is transferred to the water pipes 10 and 12.
If the inside of water pipe 10.12 is replaced with low temperature water,
The operation of the water pump 7 is stopped.

The hot water stored in the buffer tank 4 is supplied with an amount of heat corresponding to the heat dissipated from the buffer tank 4 from the heater 13, and is maintained at the hot water temperature.

Effects of the Invention As described above, in the central hot water supply system according to the present invention, there is no need to keep the hot water in the water pipes at a high temperature when there is no hot water supply load, so there is no need to circulate hot water, and the power consumption of the water pump is reduced. Moreover, by replacing the hot water in the water pipe with low-temperature water, the amount of heat radiation loss from the water pipe is also reduced, which is extremely useful in practice.

[Brief explanation of drawings]

The figure is a system configuration diagram of an embodiment of the central hot water supply system according to the present invention. 1... Heat source machine, 2... Center tank,
3... Water pipe line, 4... Buffer tank, 5...
...Outward header, 6-1~n...1st three-way switching valve, 7-1~n...Water pump, 8-1.2
...Second three-way switching valve, 9...Return header, 1o-1~n...Water pipe, 11-1.2.
...Water pipe line, 12-1~n...Water pipe line,
13-1.2...Heater, 14...
Hot water faucet, 16... city water pipe.

Claims (1)

[Claims] A heat source device and a center tank heated by the heat source device are provided, a plurality of hot water taps are connected to a buffer tank, a first three-way switching valve is provided near the center tank, and a first three-way switching valve is provided near the buffer tank. connecting the buffer tank to the center tank via a water line having a second three-way switching valve and a water pump;
A hot water supply load is detected based on the water level in the buffer tank, and when there is no hot water supply load, the flow path of the first three-way switching valve is switched to replace hot water in the water pipe with low temperature water. central hot water system.