JPH0136060Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a wastewater heat recovery device.

Here, wastewater refers to waste water such as sewage (such as drainage from large urinals), gray water (such as drainage from hand wash basins, bathrooms, and sinks), rainwater, and special drainage (such as kitchen drainage containing a large amount of oil). refers to all of

(Prior Art) Conventionally, a heat recovery device that recovers residual heat from bathroom wastewater as a heat source for a refrigerator using a heat pump and reuses it for hot water supply in a bath is disclosed in Japanese Patent Publication No. 55-667 and Japanese Patent Application Laid-Open No. 57-73330. It is known as shown in

To briefly explain these conventional techniques based on FIGS. 2 and 3, the conventional technique described in Japanese Patent Publication No. 5-667 has a structure in which a drain tank 71 that receives waste water from a bathhouse 70 is installed as shown in FIG. , a refrigerator 7 that recovers heat by using a heat pump as a heat source using the residual heat of the wastewater.
A hot water tank 7 incorporating the evaporator 73 of No. 2 and provided on the water supply side.
4, incorporating the condenser 75 of the refrigerator 72,
The remaining heat of the bathroom waste water is recovered by a heat pump using a refrigerator 72 and reused for hot water supply in the bath. In this way, a heat exchanger 82 for exchanging heat with the waste water is disposed in a waste water tank 81 that receives waste water from the bathhouse 80, and an evaporator 84 of a refrigerator 83 that uses the residual heat of the waste water as a heat source is connected to the heat exchanger 82. 82, the heat of the waste water pumped up by the heat exchanger 82 is absorbed by the evaporator 84, and the residual heat of the waste water is recovered.

In FIGS. 2 and 3, 76 and 85 are compressors, 77 and 86 are expansion valves, and in FIG. 3, 87 is a condenser and 88 is a heat storage tank.

In addition, all of the conventional techniques described above recover residual heat from bathroom wastewater, and for kitchen wastewater,
It is only used for flushing water in toilets and make-up water for cooling towers, and no proposal has been made to recover and use the residual heat.

(Problems to be solved by the invention) According to the conventional techniques explained above, since the residual heat of bath water wastewater can be recovered, wasteful energy waste can be reduced, and energy conservation can be achieved accordingly. , the drainage tank 71,
81 are all single-tank type, and perform only heat recovery, and all of the waste water that has undergone heat recovery is discharged.

The present invention focuses on the fact that when the wastewater, including the bathwater wastewater, is used as a heat source and the waste heat is recovered by a heat pump, the temperature of this wastewater decreases, and by closing the water tank, the water tank can be used as a heat storage tank for cold water. This system can also be used for air conditioning or, for example, food cooling.The purpose is to recover wastewater waste heat and use it for hot water supply or space heating, while also using the water tank as a heat storage tank for cold water in the summer. The point is that it can also perform air conditioning.

(Means for solving the problem) In order to solve the above problems, the present invention provides a water evaporator 11, condensers 12, 13, and compressor 14.
and a water tank 2 that receives waste water from the waste water source 1, and the evaporator 11 is connected to the water tank 2.
In addition, the water tank 2 is provided so as to recover heat using the water in the water tank 2 as a heat source, and the water tank 2 is connected to a water inlet pipe 31.
a first water tank 2a that receives water from the wastewater source 1, and a second water tank 2 that is associated with the evaporator 11.
The second water tank 2a and 2b are divided into two water tanks 2a and 2b and communicated with each other through an on-off valve 41.
A is characterized in that a user-side water cooler 62 is connected to the water cooler 62.

(Function) Heat can be recovered by a heat pump using the water in the water tank 2 as a heat source and used as hot water or hot air for hot water supply or space heating, and communication between the first water tank 2a and the second water tank 2b is cut off by closing the on-off valve 41. By closing off the second water tank 2b, the second water tank 2b can be used as a heat storage tank for cold water, and can be used for supplying cold water in the user-side water cooler 62 connected to the second water tank 2b, or for cooling. It also becomes possible to do this.

(Example) The example shown in Fig. 1 recovers the residual heat of wastewater such as kitchen wastewater in a hotel building and uses it for hot water supply, and also uses the wastewater from a wastewater source 1 such as a kitchen. As will be described later, gray water is treated and a gray water tank 2 that receives this gray water is connected to a first water tank 2 as described later.
a and a second aquarium 2b, and this second aquarium 2b
is used as a heat storage tank for cold water, and can also be used for air conditioning and food cooling. a user-side water heater 4 that utilizes gray water waste heat for hot water supply; and the wastewater source 1.
A gray water treatment device 5 is interposed between the water tank 2 and the water tank 2, and is connected to the second water tank 2b, and is connected to the second water tank 2b, and supplies cold water to the second water tank 2b. When used as a heat storage tank, it is equipped with a user-side water cooler 62 that performs air conditioning using cold water.

The refrigerator 3 includes a water evaporator 11, a pair of water first and second condensers 12 and 13, a compressor,
4 and an expansion valve 15, a gray water outgoing pipe 21 and a gray water return pipe 22 having a gray water pump 20 connected to the second water tank 2b are connected to the evaporator 11, and the gray water returning pipe 22 is connected to the evaporator 11. The gray water from the second water tank 2b is pumped up by driving the gray water pump 20 to the evaporator 11.
The refrigerator 3 is constructed so that the gray water is directly guided to the water and recovered as heat as a heat source. be.

Note that the heat recovery performed using the gray water as a heat source may be performed by incorporating the evaporator 11 into the second water tank 2b, in addition to using the gray water outgoing pipe 21 and the gray water return pipe 22, or by incorporating the gray water into the second water tank 2b. A heat exchanger may be incorporated in the water tank 2b and the heat exchanger and the evaporator 11 may be connected through water piping.

The first condenser 12 also includes a circulation pump 2.
3 is connected to the first water pipe 24, and the user-side water heater 4 is connected via this first water pipe 24.

This water heater 4 uses gray water as a heat source to collect waste heat from gray water, which is recovered by a heat pump, and uses it for hot water supply.As shown in FIG. A water supply pipe 2 that is assembled and connected to the first water pipe 24 and connected to the water heater 4
It heats fresh water such as tap water supplied from 5 and connects it so that hot water can be drawn from the hot water pipe 26,
Alternatively, water for hot water supply is heated by connecting a water supply pipe and a hot water supply pipe to the water-to-water heat exchanger 4a.

Further, the second condenser 13 includes a circulation pump 27.
, and is connected to the cooling tower 28.
A water pipe 29 is connected to radiate excess waste heat from the cooling tower 28.

Further, the water tank 2 is installed mainly at the lowest underground level of the building, and the first and second water tanks 2
a and 2b may be formed separately, but
It is mainly formed by providing a partition plate 30 at an intermediate portion in the longitudinal direction of one aquarium 2 to partition it.

The first water tank 2a is a gray water receiving tank that receives waste water because the amount of waste water discharged from the waste water source 1 is not constant (changes depending on use) and must be temporarily stored. On one side,
The water inlet pipe 31 connected to the gray water treatment device 5 is connected to the second water tank 2b, and the second water tank 2b is connected to the evaporator 11, and heat is recovered by a heat pump using the gray water in the second water tank 2b as a heat source. A water tank on the heat source side is connected to one side in the length direction (opposite to the connection side of the water inlet pipe 31), and a water outlet pipe 32 for discharging surplus water is connected thereto, and and the gray water recovery pipe 22, and a fan 61 is attached to the user side water cooler 62, which constitutes the air conditioner 6.
are connected via a cold water pipe 64 with a pump 63.

In addition, since the water piping from the drainage source 1 to the first water tank 2a is attached to the ceiling or behind the wall of the building, the water pipes are connected to the ceiling or behind the walls of the building. It heats the room by recovering heating heat.

The first water tank 2a and the second water tank 2b are communicably connected via a communication pipe 33 having a first on-off valve 41, and the water outlet pipe 32 is connected to the water outlet pipe 32 to open and close the water outlet pipe 32. A second on-off valve 42 is provided, and a third on-off valve 4 is provided in the first water tank 2a.
A second water outlet pipe 34 having a diameter of 3 is connected thereto.

Therefore, the first and second on-off valves 41, 42
By opening the gray water inlet pipe 31, the first
The gray water supplied to the water tank 2a is the first water tank 2a.
The water flows from the water to the second water tank 2b via the communication pipe 33, and the surplus water is discharged from the water outlet pipe 32, making it possible to recover heat from the entire amount of wastewater discharged from the wastewater source 1. Moreover, by closing the first and second on-off valves 41 and 42 and opening the third on-off valve 43, gray water supplied to the first water tank 2a does not flow into the second water tank 2b. The surplus water is discharged from the second water outlet pipe 34, and a certain amount of gray water is stored in the second water tank 2b, which can be used as a cold water heat storage tank for cooling purposes as described later.

The first and second water tanks 2a and 2b are provided on the upper floors, and the gray water from each of these water layers 2a and 2b is pumped up, and the gray water is used, for example, as flushing water for toilets or supplementary water for cooling towers. An elevated water tank 35 for use is connected to a gray water utilization pipe 3 with a pump 36.
It is connected via 7.

This gray water utilization pipe 37 has fourth and fifth on-off valves 4 for the first and second water tanks 2a and 2b, respectively.
4 and 45, respectively.

In addition, the gray water treatment device 5 removes filth and garbage mixed into the waste water, purifies it, and turns it into gray water. A sludge storage tank 56 is connected to the settling tank 54, and the settled sludge is taken out, dehydrated, and then discharged in the form of a cake. This gray water treatment device 5 is designed to minimize heat radiation, and the gray water introduced into the gray water tank 2 can have a temperature of about 15° C. or higher.

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

The waste water with waste heat discharged in the kitchen is treated by the gray water treatment device 5, and after being purified and turned into gray water, it is first received in the first water tank 2a, and in winter, Open the first and second on-off valves 41 and 42, and open the water inlet pipe 3.
The gray water supplied from the first water tank 2a to the first water tank 2a flows from the first water tank 2a to the second water tank 2b, and the surplus water is discharged from the water outlet pipe 32.

In this state, the compressor 14 of the refrigerator 3
When the gray water pump 20 is driven at the same time as the gray water pump 20, the purified gray water is directly led to the evaporator 11 through the gray water outgoing pipe 21, and heat is recovered from this gray water. The gray water waste heat recovered by the heat pump using the gray water as a heat source is
The water for hot water supply is heated in the user-side water heater 4 via the first condenser 12 and can be used as hot water.

Therefore, in the heat recovery performed as described above, the entire amount of wastewater discharged from the wastewater source 1 is treated as gray water,
It is possible to recover heat from the entire amount of gray water by flowing it from the first water tank 2a to the second water tank 2b.In addition, in the embodiment, the gray water is directly transferred from the gray water outgoing pipe 21 to the evaporator 1.
1 and recovers heat, gray water waste heat can be used effectively and the efficiency of the refrigerator can be improved.Furthermore, the refrigerator 3 can be made into a unit, and gray water treatment equipment can be used. Since the gray water treated in step 5 is led to the evaporator 11 through the gray water outgoing pipe 21, the gray water waste heat can be effectively used, and the refrigerator efficiency can be improved while the gray water No clogging occurs in the outgoing pipe 21 and gray water return pipe 22.

Additionally, since it recovers heat from kitchen wastewater, the water temperature of this kitchen wastewater can be lowered, and the growth of algae and moss can be suppressed.

Moreover, as described above, the first and second water tanks 2
By communicating the water tanks 2a and 2b, each water tank 2a and 2b can be used as a heat source water tank for the heat pump, and heat can be recovered from the entire amount of gray water. 4
2 and shut off the second water tank 2b,
By using the second water tank 2b as a cold water heat storage tank, it is possible to cool the kitchen, for example. At this time, the third and fourth on-off valves 43 and 44 are open, and the fifth on-off valve 45 is in a closed state.

That is, by closing off the second water tank 2b and operating the refrigerator 3, a certain amount of gray water stored in the second water tank 2b is cooled.
By driving the fan 61 of the air conditioner 6 and driving the pump 63 to circulate the cold water in the second water tank 2b to the user-side water cooler 62, cold air can be generated in the air conditioner 6. For example, it will be possible to cool the kitchen.

The heat source in this case is the indoor air of the kitchen where the air conditioner 6 is installed, but if the heat source is insufficient, the first and second on-off valves 41 and 42 are opened and the first water tank 2a is turned on. Gray water may be introduced.

Further, in the case where the water tank 2 is integrally formed and the first and second water tanks 2a and 2b are formed by the partition plate 30, the communication pipe 33 may be disposed within the second water tank 2b, for example. 1. When the on-off valve 41 is a manual type, external piping is preferable.

Furthermore, when the first and second water tanks 2a and 2b are formed separately, it goes without saying that these tanks 2a and 2b are connected by a communicating pipe consisting of external piping.

Further, the first to fifth on-off valves 41 to 45 are
Although a solenoid valve is mainly used, a manual valve may also be used.

Further, a water supply pipe 25 and a hot water supply pipe 26 are connected to the water heater 4 on the user side, and the recovered gray water waste heat is used as hot water for hot water supply, but it may also be used as hot air for space heating. Further, the first condenser 12 may be an air type with a fan attached instead of a water type, so that the first condenser 12 directly generates hot air.

Furthermore, although the user-side water cooler 62 is equipped with a fan 61 to constitute the air conditioner 6 and used for cooling, it may also be used as cold water for, for example, cooling food.

In addition, the user-side water cooler 62 includes a second water tank 2b.
Although the gray water inside the tank is directly supplied through the cold water pipe 64, instead of this, a heat exchanger for exchanging heat with the gray water is provided in the second water tank 2b, and this heat exchanger is connected to the cold water pipe 64. In this way, the cold water in the gray water may be transferred to the circulating water in the cold water pipe 64.

(Effects of the invention) As described above, the present invention divides the water tank 2 into the first water tank 2a which is the wastewater receiving side and the second water tank 2b which is the heat source side, and the opening/closing valve 41 of each of these water tanks 2a, 2b.
Since the second water tank 2b is communicated with the second water tank 2b by closing the on-off valve 41 and closing off the second water tank 2b, it is possible to recover heat from the entire amount of wastewater discharged from the gray water source 1. It can be used as a heat storage tank for cold water, and the user-side water cooler 62 connected to the second water tank 2b can generate cold water or cold air, which can be used for air conditioning.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the device of the present invention, and FIGS. 2 and 3 are schematic explanatory diagrams showing a conventional example. 1... Drainage source, 2... Water tank, 2a... First water tank, 2b... Second water tank, 3... Freezer, 11...
Evaporator, 12, 13... Condenser, 14... Compressor, 31... Gray water inlet pipe, 41... First on-off valve,
62... User-side water cooler.

Claims (1)

[Scope of utility model registration request] A refrigerator 3 having a water evaporator 11, condensers 12, 13, and a compressor 14, and a water tank 2 for receiving waste water from a waste water source 1 are provided. The water tank 2 is connected to a water inlet pipe 31 to receive water from the drainage source 1, and a second water tank is connected to the evaporator 11. The second water tank 2b is divided into two water tanks 2a and 2b, and communication is established between the two water tanks 2a and 2b via an on-off valve 41.
A wastewater heat recovery device characterized in that a user-side water cooler 62 is connected to a water tank 2a.