JPS6193338A - Hot water supply system utilizing waste heat - Google Patents

Abstract

PURPOSE:To make it possible to effectively utilize the waste heat of an appliance by heating the thermal medium by the heat from the appliances immersed in the thermal medium so as to store hot water in a tank via a heat exchanger immersed in the thermal medium. CONSTITUTION:When an engine 1 is run to actuate a heat pump circuit, the thermal medium 5 is heated by the heat of it as well as the heat from a condenser 3, and the waste heat from the respective sources is accumulated. When a solenoid valve 13 is opened and a pump 10 is driven thereafter, the water in a tank 7 is circulated through a water pipe 9, a heat exchanger 11 and a return pipe 12, and is heated in the heat exchanger 11 by the heat of the thermal medium 5. In this manner, hot water is stored in the tank 7. When a tap 17 is opened, the solenoid valve 13 is closed and the pump 10 is driven to cause the hot water in the tank 7 to be reheated in the heat exchanger 11 and to be discharged from the tap via a hot water pipe 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water heater, and particularly to a water heater that utilizes waste heat.

[Prior art]

Conventional water heaters have a dedicated heating device, such as a gas boiler or an electric heater, as a water heating source, and consume energy to heat the water.

On the other hand, heat is generated during operation in various devices and equipment,
This heat is normally discarded as waste heat.

[Purpose of the invention]

An object of the present invention is to provide a water heater that effectively utilizes waste heat from nine devices without using a dedicated heating device as a heat source.

[Structure of the invention]

The present invention relates to a heat storage tank in which a device that generates waste heat during use is immersed and a heat medium that is heated by the waste heat is stored, a heat exchanger immersed in the heat medium of the heat storage tank, and a water supply tank. A tank to which water is supplied, a water pipe led out from the tank and connected to the inlet of the heat exchanger, a feeding pump provided in the middle of the water pipe, an outlet of the heat exchanger, and a water pipe connected to the inlet of the heat exchanger. A return pipe that connects to the tank, and an on-off valve provided in the middle of the return pipe.

a hot water supply pipe extending from the outlet of the heat exchanger branching off from the return pipe; a hot water faucet provided at the tip of the hot water supply pipe; a temperature detector for detecting the temperature inside the tank; A pressure switch is provided midway and detects that the faucet is opened, and the detection signals from the temperature sensor and the pressure switch are input to drive the pump when the temperature inside the tank is below a predetermined value, and the on-off valve. and a controller that controls the pump and the on-off valve so as to close the on-off valve in response to the detection output of the pressure switch and drive the pump. It is a water heater.

[Action/effect of the invention]

According to the present invention, the heat medium is heated by the heat generated by the device immersed in the heat medium, and waste heat from the two devices is stored in the heat medium.

The water in the tank can be heated by circulating it through a heat exchanger inseminated into a heat medium by controlling the pump and on-off valve, and can be stored in the tank. When the faucet is opened, the hot water in this tank is further heated by a heat exchanger and then hot water is supplied.

Therefore, according to the present invention, heat is stored in the heat medium, which is the waste heat of equipment that was conventionally discarded, and the heat is constantly heated and stored as hot water.
Since hot water can be supplied when needed, significant energy savings can be achieved.

〔Example〕

An embodiment of the present invention will be explained below with reference to the drawings.
・This is a system in which the compressor of a heat pump system is driven by an internal combustion engine (hereinafter referred to as the engine), and the waste heat from Ennon is used for hot water supply.

In the figure, l is an engine, 2 is a compressor for compressing the refrigerant driven by the engine 1, 3 is a condenser for condensing the refrigerant compressed by the compressor, 4 is a heat exchanger for cooling the heat medium, which will be described later. It has a refrigerant evaporator inside. That is, compressor 2. Capacitor 3. The refrigerant evaporator constitutes a heat pump circuit, but the refrigerant pipes are not shown for the sake of simplicity.

In order to utilize the waste heat of the engine 1 that drives the compressor 2 and the waste heat of the condenser 3, the engine is placed in a heat storage tank 6 containing a heat medium 5 (water is used here, preferably mixed with a corrosion inhibitor). 1 and the capacitor 3 are water-tightly sealed and immersed.

On the other hand, a tank 7 is provided so that tap water is supplied via a constant water level valve 8, and a water pipe 9 is connected to the tank 7.
is drawn out and introduced into the heat storage tank 6 via the pump lO.

A heat exchanger 11 is immersed in a heat medium in the heat storage tank 6.
The introduction end of the water pipe 9 is connected to the inlet of a heat exchanger 110. The outlet of the heat exchanger 11 is connected to a return pipe 12 to the tank 7, and a solenoid valve 13 is installed as an on-off valve in the middle of the return pipe 12.
is provided.

Now, when we drive 3/Non 1 to operate the heat pump circuit, the heat of 2 and the heat of condenser 3 is used to generate heat medium 5.
are heated and their respective waste heat is stored. Here, when the solenoid valve 13 is opened and the pump 10 is driven, the water in the tank 7 flows into the water pipe 9. Heat exchanger 11. It circulates through the return pipe 12 and is heated by the heat of the heat medium 5 in the heat exchanger 11.

Thus, hot water is stored in the tank 7.

The tank 7 is provided with a temperature sensor 14 for detecting water temperature.
The detection output is sent to the controller 15, which drives the pump 10 and opens the solenoid valve 13 when the water temperature in the tank is below a predetermined value, and when the water temperature in the tank is above the predetermined value, the I? 7 grams lO
to stop.

A hot water supply pipe 16 extends from the outlet of the heat exchanger 15, branching off from the return pipe 12, and a hot water supply faucet 17 is provided at the tip of the hot water supply pipe 16. Note that a check valve 18 is installed in the middle of the hot water pipe 16.
An expansion tank 19 is provided, and a pressure switch 20 for detecting that the faucet 17 is opened is provided.

The pressure switch 20 outputs a detection signal to the controller 15, and in response to this detection signal, the controller 15 closes the solenoid valve and drives the pump 10.

Therefore, when you open the faucet 17 now, the solenoid valve 13 closes and the pump 10 is driven, so the hot water in the tank 7 is reheated by the heat exchanger 11 and then passed through the hot water pipe 16 and supplied from the faucet. be done.

In the illustrated embodiment, a mixing faucet is used as the faucet 17.
Tap water is supplied through a check valve 21, and by operating a faucet, hot water at an appropriate temperature, only hot water, only cold water, or a mixture of both can be obtained.

In addition, in the above embodiment, since water is used as the heat medium, a heat medium liquid level detector 22 is provided in the heat storage tank 6 in order to replenish the decrease due to evaporation of the heat medium, etc. At this time, tap water is supplied into the heat storage tank 6 via the check valve 24 at 27p 23. Note that the controller 15
In response to the output of the liquid level detector 22, the pump 23
It also has the function of controlling the operation of the

In addition, since the above-mentioned embodiment has been shown as a system in which the hot water supply device is integrated with a device for heating and cooling, a general explanation will also be given regarding the operation of the heating and cooling device.

The heat medium in the heat storage tank 6 is supplied via a conduit 25 to a fan coil unit 26 provided indoors by a pump 27. The heat medium coming out of the fan coil unit 26 is returned to the heat storage tank 6 through a dedicated pipe 29 having a three-way valve 28 in the middle.

Therefore 1. ]? When the pump is driven and the fan of the fan coil unit 26 is driven, a heating medium flows through the fan coil unit 26 in the room to perform heating.

Again +'! In front of the 2-type ring 270 of the h pipe 25 and the three-way valve 28
1) Connect the remaining 1-1 with the heat exchanger 4 described in 1). In this configuration, when the pump 27 is driven and the three-way valve 28 is switched to the heat exchanger 234 side, the heat medium that has flowed from the heat storage tank 6 to the fan coil unit 260 passage by the pump 27 flows through the heat exchanger 4, and It flows to the fan coil unit 26. That is, here, the heating medium.

Pump 27. Fan coil unit 26. Three-way valve 28,
circulates in a closed loop of heat exchanger 4. At this time, when the heat pump circuit is operated, the heat medium is cooled by the four evaporators of the heat exchanger. Therefore, the tear fan coil unit 26 cools the room.

In addition, pump 30. Three-way valve 31. The 34792 circuit between conduits 25 and 29 consisting of the heat radiator 32 is configured to operate the pump 30 to flow the heat medium through the heat radiator 32 to the outside when the temperature of the heat medium in the heat storage tank becomes too high. It is used to radiate heat and lower the temperature of the heating medium.

In addition, a bypass pipe 33 connects the remaining outlet of the three-way valve 31 with the conduit 29. At the beginning of system operation or when the temperature of the heating medium drops too much, the three-way valve 33 is switched to the pipe conduit 2, By driving the heat exchanger 30, the heat medium in the heat storage tank 6 is uniformly and rapidly heated by the heat from the pump/l and the condenser 3 while circulating the heat medium.

[Brief explanation of the drawing]

The figure is a schematic diagram showing an embodiment in which waste heat from a compressor-driving ennon and a condenser of a heat pump device is used as the heat source of the water heater of the present invention, together with an air-conditioning circuit. ■...Ennon, 3...Condenser, 5...Heating medium, 6...Heat storage tank, 7...Tank, 9...Water pipe, 1
0...Pump. 12...Return pipe, 13...Opening/closing valve (electromagnetic valve), 14
...Temperature detector, 15...1 whiteout device, 16...Hot water pipe, 17...Faucet, 20...Pressure switch.

Claims (1)

[Claims] 1. A heat storage tank in which a device that generates unnecessary heat during use is immersed and a heat medium that is heated by the unused heat is stored, a heat exchanger immersed in the heat medium of the heat storage tank, and tap water. a tank that is supplied with water, a water pipe led out from the tank and connected to the inlet of the heat exchanger, a feeding pump provided in the middle of the water pipe, an outlet of the heat exchanger and the tank. a return pipe connecting the above, an on-off valve provided in the middle of the return pipe, a hot water supply pipe extending from the outlet of the heat exchanger to branch from the return pipe, and a hot water supply pipe provided at the tip of the hot water supply pipe. A faucet, a temperature detector that detects the temperature inside the tank, a pressure switch installed in the middle of the water supply pipe that detects when the faucet is opened, and input detection signals from the temperature detector and the pressure switch. When the temperature inside the tank is below a predetermined value, the pump is driven and the on-off valve is opened, while upon receiving the detection output of the pressure switch, the on-off valve is closed and the pump is driven. A water heater using waste heat, characterized by having a pump and a controller that controls an on-off valve.