JPH0512679Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a heat pump for cold and hot water with a heating and cooling tower for producing cold water in the summer and hot water in the winter.

[Conventional technology]

A conventional heat pump for cold and hot water of this type will be explained based on FIG. 2. First, when operating a cold water production cycle in the summer, the refrigerant is transferred from the main compressor 3 to the cooling water condenser 4 to the on-off valve _V2. → cold water evaporator 1 → on-off valve V ₁ → main compressor 3 constitutes a circulating cycle.

At this time, the on-off valves V ₄ and V ₅ are closed, and the cooling water condenser 4 is connected to the heating/cooling tower 7.
The cooling water cooled in is circulated as a heat transfer medium by a pump 8 via on-off valves V ₈ and V ₉ .

Next, when operating the hot water production cycle in winter, the refrigerant is transferred from main compressor 3 to booster compressor 5.
→ Hot water condenser 6 → Opening/closing valve V ₁₀ → Opening/closing valve V ₃ → Antifreeze evaporator 2 → Main compressor 3 constitutes a circulating cycle. At this time, the heating/cooling tower 7 acts as a heating tower and collects heat from the outside air, but antifreeze (brine) is used as a heat transfer medium to prevent freezing when the outside temperature drops.
use. To do this, the cooling water from the heating/cooling tower 7 is extracted, the on-off valve V ₆ is opened, and the pump 10 is used to fill the heat transfer medium path between the heating/cooling tower 7 and the antifreeze evaporator 2 with antifreeze from the antifreeze tank 9. do. Also, when replacing antifreeze with regular cooling water, make sure to
Open V ₇ and pump antifreeze into antifreeze tank 9 with pump 8.
It is to be collected.

[Problem that the invention attempts to solve]

Conventional heat pumps of this type are equipped with two evaporators, a cold water evaporator 1 and an antifreeze evaporator 2, and because they are used alternately during summer and winter operation, one of the evaporators becomes idle equipment. Not only does this require a large space and increase costs, but it also requires equipment for switching between the two evaporators, its security, and instrumentation, which further increases costs and causes troublesome operational management. There were problems such as:

Japanese Patent Publication No. 50-23222 describes an evaporator in which a group of fluid tubes for flowing antifreeze and a group of fluid tubes for flowing cold water are installed in one evaporator. When used, other tube groups are idle, resulting in idle equipment, and the cost is high because a large evaporator must be used.

The reason why two evaporators were used in the first place was because it was thought that if there was only one evaporator, the cold water would be contaminated by antifreeze when switching between the cold water system and the antifreeze system, which would have a negative effect on the cooling of the cold water. It is.

The present invention solves the above-mentioned problems of conventional heat pumps for cold and hot water, and uses a single evaporator for cold water and antifreeze, simplifying the equipment and reducing the space required. The purpose is to provide

[Means for solving problems]

The present invention, as a means to solve the above problems, has the following features: 1. It is equipped with a main compressor, a cooling water condenser, a booster compressor, a hot water condenser, an evaporator, and a heating/cooling tower, and a refrigerant path and heat transfer between these devices. In a heat pump that is connected via a medium path and is configured to produce chilled water or hot water by switching the path, during cold water production operation, the fluid in the cooled fluid pipe group of the evaporator is switched to the chilled water path, and at the same time the fluid in the cooled fluid pipe group of the evaporator is switched to the chilled water path. While cooling water is passed through the heating/cooling tower, the refrigerant compressed by the main compressor is cooled in the cooling water condenser and then exchanged heat with water from the cold water path in the evaporator to obtain cold water. During hot water production operation, evaporation occurs. The fluid in the cooled fluid pipe group of the container is switched to antifreeze from the heating/cooling tower, and at the same time, the refrigerant compressed by the main compressor is further compressed and heated by the booster compressor, and then heated by exchanging heat with hot water in the hot water condenser. At the same time, the cooled refrigerant discharged from the hot water condenser is led to the evaporator via the cooling water condenser, where it exchanges heat with the antifreeze fluid led from the heating/cooling tower, and is then led to the main compressor. A heat pump for cold and hot water, characterized in that the pipes are arranged so that the fluid flowing through a group of cooled fluid pipes in an evaporator is switched between cold water and antifreeze during a cold water production operation and a hot water production operation.

2. The cold/hot water heat pump according to 1 above, wherein an opening is provided at a portion of the evaporator where the fluid to be cooled can remain, and a discharge pipe equipped with an on-off valve is connected to this opening.

It provides:

That is, the present invention replaces the conventional two evaporators, one for chilled water and one for antifreeze, with a single evaporator for chilled water and antifreeze.
The system is designed to switch between using cold water for cooling in the summer and antifreeze liquid to collect heat in the winter.

〔Example〕

An embodiment of the present invention will be described based on FIG.

In the evaporator 11 for both cold water and antifreeze, there is provided a group of cooled fluid pipes 12 which are flow paths for guiding cold water or antifreeze as a cooled fluid.

The cooled fluid pipe group 12 includes cold water paths 13 and 14 via on-off valves V ₃ and V ₄ as switching valves,
Antifreeze channels 15 and 16 are connected to the heating/cooling tower 7 via on-off valves V ₇ and V ₈ as switching valves and the pump 8, and via on-off valves V ₉ and V ₁₀ as switching valves and the pump 10. It is connected to an antifreeze tank 9.

When operating the chilled water production cycle first, the refrigerant is transferred from the main compressor 3 to the cooling water condenser 4 to the on-off valve.
V ₁ → Circulate via evaporator 11. At that time, the to-be-cooled fluid pipe group 12 of the evaporator 11 includes on-off valves V ₃ and V _{4 .}
By opening the cold water paths 13 and 14, the on-off valves V ₇ , V ₈ , V ₉ and V ₁₀ are closed.
The cooling water from the heating/cooling tower 7 is supplied to the cooling water condenser 4 by a pump 8 through an on/off valve.
It is circulated through V ₅ and V ₆ .

Next, when operating the hot water production cycle, the refrigerant circulates through the main compressor 3 → booster compressor 5 → hot water condenser 6 → on-off valve V ₂ → on-off valve V ₁ → evaporator 11.

At that time, the cold water from the cold water pipes connected to the cooled fluid pipe group 12 of the evaporator 11 is removed, the on-off valves V ₃ and V ₄ are closed, the on-off valve V ₉ is opened, and the pump 10
The antifreeze in the antifreeze tank 9 is transferred to the cooled fluid pipe group 1.
2 into an antifreeze circulation system including a heating and cooling tower 7, a pump 8, and antifreeze channels 15, 16, which are connected to the envelope cooling fluid pipe group 12. At this time, on-off valves V ₅ and V ₆ are closed,
V ₇ and V ₈ are opened. The antifreeze thus filled in the antifreeze circulation system is circulated by the pump 8 via the cooled fluid pipe group 12, the on-off valve _V8 , the antifreeze path 16, the heating/cooling tower 7, the pump 8, the antifreeze path 15, and the on-off valve _V7. .

When removing the antifreeze filled in the antifreeze circulation system, the on-off valve V ₁₀ is opened to collect the antifreeze into the antifreeze tank 9.

At this time, areas where antifreeze may remain in the evaporator 11, such as the bottom of the water chamber of the evaporator 11,
A drainage opening is provided in the opening, and an on-off valve is installed in this opening.
A discharge pipe provided with V ₁₁ and V ₁₂ was connected, and the discharge pipe was connected to an antifreeze tank 9 or a waste tank (not shown), so that the residue in the evaporator 11 could be almost completely recovered.

If a waste tank or a cold water receiving tank is used, the on-off valve V ₁₁ ,
V ₁₂ can be opened to easily drain cold water.

As described above, this embodiment requires only one evaporator 11 as a dual-purpose evaporator for chilled water and antifreeze, and when switching from winter to summer operation,
The antifreeze that was filled in the evaporator system is connected to the on-off valve V _10.
The antifreeze tank 9 is completely recovered by the operation, and then the cold water paths 13 and 14 are connected to the cooled fluid pipe group 12 in the evaporator 11, and the on-off valves V ₃ , V ₄ , V ₇ , V ₈ ,
I operated V ₉ and V ₁₀ to cool the cold water.
At this time, the cooling water condenser 4 has an on-off valve V ₅ ,
The cooling water in the heating/cooling tower 7 is circulated by the pump 8 by operating _V6 .

Next, when switching operation from summer to winter, the chilled water and cooling water filled in the chilled water system and the cooling water system close the on-off valves V ₃ , V ₄ , and the on-off valves V ₇ , V ₈ ,
After opening V ₁₀ , V ₁₁ , and V ₁₂ to discharge the liquid to the waste tank, close the on-off valves V ₁₀ , V ₁₁ , and V ₁₂ , open the on-off valve V ₉ , and fill the evaporator system with antifreeze using the pump 10 . It is something to do.

[Effect of idea]

This idea replaces the conventional two evaporators, one for cold water and one for hot water, with a single evaporator for both cold water and antifreeze, and this evaporator cools cold water in summer and recovers heat in winter. Since the system is used instead of antifreeze cooling, the structure is simple, space is small, equipment costs can be reduced, and operation management is also easy. .

In addition, since a tank for discharging antifreeze is provided in the path of the cooled fluid of the evaporator, the antifreeze can be discharged so that almost no antifreeze remains, and even if the evaporator is used for both cold water and antifreeze, Will not contaminate cold water.

Furthermore, if a drainage opening is provided at a location where the circulating fluid of the evaporator 11 may remain, and the remaining fluid is discharged to the outside through a drain pipe,
Since almost no antifreeze remains in the evaporator system, contamination of the cold water can be more completely prevented.

Although it is said that the antifreeze will be completely recovered,
In reality, a trace amount of antifreeze remains on the inner wall of the system, and the cold water is slightly contaminated by this trace amount of antifreeze, but the inventors believe that there is almost no inconvenience in cooling the cold water. Confirmed by research.

[Brief explanation of drawings]

FIG. 1 is a flow diagram of an embodiment of the present invention, and FIG. 2 is a flow diagram of a conventional example. 1...Evaporator for cold water, 2...Evaporator for antifreeze,
3... Main compressor, 4... Cooling water condenser, 5...
...Booster compressor, 6...Hot water condenser, 7...
... Heating and cooling tower, 8 ... Pump, 9 ... Antifreeze tank, 10 ... Pump, 11 ...
Evaporator, 12... Cooled fluid pipe group, 13, 14...
...Cold water path, 15, 16...Antifreeze path, V ₁ ~
V ₁₂ ...Opening/closing valve.

Claims (1)

[Claims for Utility Model Registration] 1. A main compressor, a cooling water condenser, a booster compressor, a hot water condenser, an evaporator, and a heating/cooling tower, and these devices are connected by a refrigerant path and a heat transfer medium path, In a heat pump that produces cold water or hot water by switching paths, during cold water production operation, the fluid in the cooled fluid pipe group of the evaporator is switched to the cold water path, and at the same time, the cooling water is transferred from the heating and cooling tower to the cooling water condenser. The refrigerant compressed by the main compressor is cooled in the cooling water condenser, and then heat exchanged with water from the cold water path in the evaporator to obtain cold water. During hot water production operation, the cooled fluid pipe of the evaporator is The fluid in the group is switched to antifreeze from the heating/cooling tower, and at the same time, the refrigerant compressed by the main compressor is further compressed and heated by the booster compressor, and then heat exchanged with hot water in the hot water condenser to obtain heated hot water. The cooled refrigerant discharged from the hot water condenser is guided to the evaporator via the cooling water condenser, and is heated by exchanging heat with the antifreeze fluid introduced from the heating/cooling tower before being led to the main compressor. A heat pump for cold and hot water, characterized in that the piping is arranged so that the fluid flowing through a group of cooled fluid pipes in an evaporator is switched between cold water and antifreeze during a cold water production operation and a hot water production operation. 2. The heat pump for cold and hot water according to claim 1, wherein an opening is provided at a portion of the evaporator where the fluid to be cooled can remain, and a discharge pipe equipped with an on-off valve is connected to the opening.