JPH0239146Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is an air-conditioning water heater, more specifically, it is equipped with a water tank that receives waste water from a waste water source, and the remaining heat of the waste water is recovered and used for hot water supply. The present invention also relates to an air-conditioning and hot-water supply apparatus that is provided with an ice heat storage tank that can be switchably connected to the air-conditioning unit and the water tank, thereby enabling air-conditioning and hot-water supply.

(Prior art) Conventionally, there have been methods for recovering the residual heat of waste water such as bath water as a heat source for a refrigerator and reusing it for hot water supply in baths, for example, as disclosed in Japanese Patent Publication No. 55-667 and Japanese Patent Application Laid-Open No. 57-73330. It is known as shown in the publication No.

However, these conventional structures have a single water tank for receiving waste water and only recover heat from the waste water, and are not designed to perform air conditioning.

Therefore, the applicant first divided the water tank into two tanks, a first tank and a second tank, and connected these tanks in the winter to recover heat from the waste water, and in the summer, proposed a system in which one of the water tanks was closed so that the closed water tank could be used as a cold water heat storage tank for air conditioning or food cooling. (Utility Application No. 59-179759) (Problems to be solved by the invention) According to the previous proposal, the water tank is used as a cold water heat storage tank to enable cooling, so the cooling load is reduced. If there is a balance between the water supply load and the water supply load, or if the cooling load is large, the desired hot water supply can be performed, but if the cooling load is small, the hot water supply may be insufficient, and the water tank may be Since it is only used as a heat storage tank for cold water, its heat storage performance is poor and it is not possible to significantly reduce the power of the refrigerator.

The purpose of the present invention is to recover residual heat from waste water in the summer to supply sufficient hot water, while also providing cooling, and at the same time, making it possible to significantly reduce the power required for the refrigerator for cooling.

(Means for Solving the Problems) In order to solve the above-mentioned problems of the previously proposed devices, the present invention uses an ice heat storage tank in addition to the water tank, and connects this ice heat storage tank to a cooling unit. In addition to connecting the cooling unit to the water tank, the cooling unit is switchably connected to the water tank.
1. A refrigerator 4 equipped with a hot water extraction condenser 12, an exhaust heat condenser 13, and a compressor 14, a water tank 3 for receiving waste water from the waste water source 1, and the evaporator 11 are arranged, It is equipped with an ice heat storage tank 6 capable of storing ice heat by forming a frozen layer on the surface of the heat pipe 11a, and a cooling unit 7 having a cooling heat exchanger 71, and the ice heat storage tank 6, the water tank 3, and the cooling unit 7. The present invention is characterized in that a switching means for selectively connecting the ice heat storage tank 6 to one of the water tank 3 and the cooling unit 7 is provided between the two.

(Function) In the winter, the residual heat of the waste water received in the water tank 3 can be recovered and used for hot water supply, and in the summer, the residual heat of the waste water received in the water tank 3 can be recovered and used for hot water supply. Moreover,
It is possible to freeze and store heat in the ice heat storage tank 6, and to perform cooling by this ice heat storage, and the power of the refrigerator for cooling can be significantly reduced while providing sufficient hot water supply. In the present invention, hot water supply includes not only supplying hot water to a bathhouse or the like but also supplying hot water to a heater.

(Embodiment) The embodiment shown in the drawings recovers residual heat from wastewater such as kitchen wastewater in a hotel building and uses it as bath hot water, as well as for cooling. A water tank 3 that receives the treated gray water by the gray water treatment device 2, and a refrigerator 4 that uses the gray water in the water tank 3 as a heat source to recover residual heat from the gray water using a heat pump.
It is equipped with a user-side water heater 5 that utilizes the recovered gray water residual heat for hot water supply, and a cooling unit 7 having an ice heat storage tank 6, a cooling heat exchanger 71, and a fan 72.

The refrigerator 4 is composed of a water evaporator 11 having a heat transfer tube 11a, a hot water extraction condenser 12, an exhaust heat condenser 13, a compressor 14, and an expansion valve 15. 11 is arranged in the ice heat storage tank 6.

That is, the evaporator 11 has the heat transfer tubes 11a arranged horizontally in multiple stages and rows, and forms an ice layer on the surface of the heat transfer tubes 11a to store ice heat. The ice heat storage tank 6 is formed by filling the vessel 11 with water and disposing it in the tank body 6a.

Further, a detector is used to detect the thickness of the frozen layer formed on the surface of the heat transfer tube 11a, and when the thickness of the frozen layer reaches a desired thickness, the operation of the refrigerator 4 is started. The operation of the compressor 14 is stopped, and the ice pack factor (ice filling rate) in the ice heat storage tank 6 is controlled to about 60%.

The detector may be one that detects the potential difference between the tube surface of the heat transfer tube 11a and the layer surface of the frozen layer, or a micro switch or the like may be used.

And the ice heat storage tank 6 configured as described above.
connects the water tank 3 via the first heat exchanger 21 and the cooling unit 7 via the second heat exchanger 22, and connects the water tank 3 via the first heat exchanger 21 and the cooling unit 7 via the second heat exchanger 22, and The ice heat storage tank 6 is selectively connected to one of the water tank 3 and the cooling unit 7, and the connection with the water tank 3 causes the water tank 3 to be connected to the water tank 3.
This makes it possible to recover residual heat from gray water, and by connecting it to the cooling unit 7, cooling operation becomes possible.

In the above configuration, the first heat exchanger 21 and the second heat exchanger 22 are used.
A gray water circulation circuit 27 is formed between the second heat exchanger 22 and the water tank 3, and the second heat exchanger 22 and the cooling unit 7 are connected to each other.
A cold water circulation circuit 28 is connected between the cooling heat exchanger 71 and the cooling heat exchanger 71.
A closed circuit 31 is formed between the ice heat storage tank 6 and the first and second heat exchangers 21 and 22, and a circulation pump 3 is installed in the closed circuit 31.
This is to enable the pump power of No. 2 to be reduced.

That is, although the gray water circulation circuit 27 and the cold water circulation circuit 28 require circulation pumps 29 and 30, respectively, the ice heat storage tank 3 and each of the heat exchangers 2
A closed circuit 31 can be formed between the pipes 1 and 22, and the heat medium can be circulated by pressurizing the piping resistance.
Even if the circulation pumps 29 and 30 are used in the gray water and cold water circulation circuits 27 and 28, the total power can be made smaller than when a closed circuit is constructed.

Further, the hot water extraction condenser 12 is connected to the user side water heater 5 via a first water pipe 34 having a circulation pump 33, and the residual heat recovered from gray water in the water tank 3 is connected to the hot water extraction condenser 12. The water heater 5 collects heat so that it can be used for hot water supply.

The water heater 5 incorporates a water-to-water heat exchanger 5a, is connected to the first water pipe 34, and is configured to heat fresh water such as tap water supplied from a water supply pipe 35 connected to the water heater 5. A hot water storage tank 36 is connected to the hot water outlet side, and a hot water supply pipe 37 is connected at any time.
This allows hot water to be taken out from the

The hot water supply pipe 37 may be connected to, for example, a bathhouse or the like, or may also be connected to a hot water heater.

Further, the exhaust heat condenser 13 is connected to a circulation pump 38.
, and is connected to the cooling tower 39.
A water pipe 40 is connected to radiate excess residual heat from the cooling tower 39.

The gray water treatment equipment 2 removes filth and dirt mixed in waste water, purifies it, and turns the waste water into gray water. A sludge storage tank 46 is connected to the sedimentation tank 44, and the settled sludge is taken out, dehydrated, and then discharged in the form of a cake.

This gray water treatment device 2 is designed to minimize heat radiation, and is designed to ensure that the gray water introduced into the water tank 3 has a temperature of 15° C. or higher.

In the drawings, reference numeral 47 is an outlet pipe having a solenoid valve 48, which is configured to discharge excess gray water.

Next, the operation of the embodiment configured as above will be explained.

The wastewater with waste heat discharged in the kitchen is treated by the gray water treatment device 2 and turned into gray water, which is then received into the water tank 3. When heat is recovered from gray water in winter and summer. for,
The electromagnetic valves 23 and 24 are opened, and the circulation pump 29 is driven to circulate gray water to the gray water circulation circuit 27.

In this state, the compressor 1 of the refrigerator 4
4 and the circulation pump 32 of the closed circuit 31, heat is recovered from the gray water via the first heat exchanger 21 and the state evaporator 11. The gray water waste heat recovered by the heat pump as a heat source heats the water for hot water supply in the user-side water heater 5 via the hot water extraction condenser 12 and can be used as hot water.

In addition, while hot water can be generated using the waste heat of the gray water as described above, in the summer, the electromagnetic valve 23,
24 and open the electromagnetic valves 25 and 26 to switch the ice heat storage tank 6 from the water tank 3 to the cooling unit 7, thereby enabling cooling.

Moreover, since this cooling can be performed using the ice heat stored in the ice heat storage tank 6, the refrigerator power required for cooling can be reduced, and since heat can be stored using late-night electricity, the running cost of the air conditioner can be reduced. be.

In addition, when there is a need for hot water supply during cooling,
Even when the cooling load is small and a heat source is insufficient to provide sufficient hot water supply, sufficient hot water supply can be easily obtained by switching the ice heat storage tank 6 to the water tank 3.

In the embodiment described above, the closed circuit 31, gray water circulation circuit 27, and cold water circulation circuit 28 were formed using the first and second heat exchangers 21 and 22, but the first and second heat exchangers 21, 22 is not necessarily necessary.

Further, the cooling unit 7 may be used not only to cool a living room such as a kitchen, but also to cool food, for example.

(Effects of the invention) As described above, the present invention uses the ice heat storage tank 6, and selectively switches the ice heat storage tank 6 to either the water tank 3 or the cooling unit 7, and uses waste water from a waste water source as a heat source. By using a heat pump, the residual heat of the waste water is recovered in the ice heat storage tank 6 and can be used for hot water supply, while cooling is made possible by the ice heat storage stored in the ice heat storage tank 6. Therefore, the refrigerator power for cooling is reduced. If a hot water supply load occurs, sufficient hot water can be supplied regardless of the cooling load.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of the device of the present invention. 3... Water tank, 4... Freezer, 6... Ice heat storage tank,
7... Cooling unit, 11... Water evaporator, 11
a... Heat exchanger tube, 12... Condenser for hot water extraction, 13
...Exhaust heat condenser, 14...Compressor, 23-26
……solenoid valve.

Claims (1)

[Scope of utility model registration request] A water evaporator 11 with a heat transfer tube 11a, a hot water extraction condenser 12, an exhaust heat condenser 13, and a compressor 1
4, a water tank 3 for receiving waste water from the waste water source 1, and the evaporator 11 are arranged, and an ice layer is generated on the surface of the heat transfer tube 11a to enable ice heat storage. The ice heat storage tank 6 is provided between the ice heat storage tank 6 and the water tank 3 and the cooling unit 7, and the ice heat storage tank 6 is provided between the water tank 3 and the cooling unit 7. 7. A cooling hot water supply device characterized in that a switching means is provided for selectively connecting one side of the cooling water heater.