JPH0137671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first cold water circuit for supplying cold water to air conditioners installed in mid-to-high-rise areas of a high-rise building, in a first evaporator of a refrigerator installed in a low-rise area or an underground area. A second cold water circuit connected to a heat exchanger to form a closed circulation circuit and supplying chilled water to air conditioners installed in the lower and underground parts of the building is installed in the lower and underground parts of the building. The present invention relates to a cooling device connected to a type heat storage tank.

In this type of cooling device, it is preferable in terms of cost effectiveness to operate the refrigerator constantly.

For this reason, conventionally, when cooling mid-to-high-rise areas, only the evaporator for cooling cold water that directly connects to the air conditioner for the mid-to-high-rise areas was used in the evaporator of the refrigerator, and when cooling of the mid-to-high rise areas was stopped, such as at night, the heat storage tank was used. The refrigerant circuit was switched to use only the evaporator for cooling stored cold water.

This is because the chilled water circuit to the air conditioner for the middle and upper floors is of a closed type to reduce the pumping power, so it is difficult to switch in the chilled water circuit on the secondary side of the evaporator.

However, in such a conventional configuration, when cooling mid-to-high-rise areas, the output of the refrigerator must be varied (in other words, the capacity must be reduced) in response to fluctuations in the cooling load of the mid-to-high-rise areas, so Compared to operating at maximum output, this method is not cost-effective and has the problem of increased operating costs.

The present invention has been made in view of the above-mentioned circumstances, and uses a regularly operated refrigerator to supply cold heat according to the load fluctuations of the air conditioners in mid-to-high-rise areas. The resulting surplus cold heat is efficiently stored in a heat storage tank, and the cold heat stored in the heat storage tank is supplied to the air conditioner in the lower and underground areas, and used for cooling the lower and underground areas. In particular, the purpose is to reduce the operating cost of the entire cooling system.

The characteristic structure of the present invention for achieving the above object is as follows:
In the above-mentioned cooling device, a heat storage circuit that supplies heat storage cold water to the heat storage tank is connected to a heat exchanger of a second evaporator of the refrigerator, and the first evaporator and the second evaporator are connected to the liquefaction circuit in both the evaporators. The first and second evaporators are connected at substantially the same height so that the refrigerant can flow mutually, and each of the first and second evaporators is provided with a vaporized refrigerant path for supplying the vaporized refrigerant to a pressurizing device provided in the refrigerator. With,
At least one of the vaporized refrigerant paths is provided with a flow rate regulating valve that operates based on the detection result of the chilled water temperature of the first chilled water circuit, and this configuration provides the following effects.

That is, when the flow rate adjustment valve is operated based on the detection result of the chilled water temperature in the first chilled water circuit while the refrigerator is operated steadily, the amount of vaporized liquefied refrigerant in the first and second evaporators becomes relatively In contrast, when vaporization in the first evaporator is promoted and the amount of cold heat supplied to the cold water increases, vaporization in the second evaporator is suppressed and the amount of cold heat supplied to the heat storage cold water decreases. When vaporization in the second evaporator is suppressed and the amount of cold heat supplied to the cold water decreases, vaporization in the second evaporator is promoted and the amount of cold heat supplied to the heat storage cold water increases.

Since both evaporators are connected at approximately the same height so that the liquefied refrigerant can flow mutually, the liquefied refrigerant flows appropriately depending on the amount of liquefied refrigerant vaporized in each evaporator. To efficiently cool cold water and heat storage cold water.

Therefore, while the constantly operating refrigerator supplies cold heat to the air conditioners in the middle and high rise areas according to the load fluctuations of the air conditioners in the middle and high rise areas, Since the amount of cold heat supplied to the thermal storage cold water is increased or decreased, the excess cold heat generated due to fluctuations in the cooling load in the mid-to-high-rise areas is efficiently stored in the heat storage tank, and the stored cold heat is used to cool the low-rise areas and underground areas. By using this method, it is possible to reduce the operating cost of the entire cooling device.

Next, examples of the present invention will be described.

First Example (See Figures 1 and 2) An example of use as a cooling device in a high-rise building 1 is shown below.

A first cold water circuit 3 of a closed circulation type that distributes and supplies cold heat to the air conditioner 2A installed in the mid-to-high-rise part of the high-rise building 1
A second cold water circuit 4 is provided to distribute and supply cold heat to air conditioners 2B provided in the lower floors and underground portions of the high-rise building 1.

The first cold water circuit 3 includes an air conditioner 2A, a heat exchanger 6A in the first evaporator 5A, and a circulation pump 7.
It is configured as a closed circulation circuit in which these are connected in series to form a closed loop.

A usage part 4A that communicates the open heat storage tank 8 and the air conditioner 2B, and a heat exchanger 6 in the second evaporator 5B.
This is an open circuit configured by a heat storage circuit 4B that communicates B and the heat storage tank 8.

And the first and second evaporators 5A, 5B
are connected to each other by a connecting pipe 9 at or near the lower part thereof so that the liquefied refrigerant can flow to each other.

Vaporized refrigerant supply paths 11A and 1 extend from the tops of both evaporators 5A and 5B toward the inlet of the compressor 10 (the illustrated one is screw type), respectively.
Refrigerator A is configured by connecting a condenser 13 provided at 1B to liquefy the compressed refrigerant from the compressor 10, and a path 15 for sending the liquefied refrigerant from the condenser 13 to the evaporator 5A, and this vaporized refrigerant supply path 11A. , 11B, a flow rate regulating valve 12 is provided in the first path 11A on the first evaporator 5A side. 14 is a cooling water pipe that cools the inside of the condenser 13.

A detector 16 for detecting the temperature of cold water in this circuit 3 is provided between the outlet of the heat exchanger 6A of the first evaporator 5A of the first circuit 3 and the air conditioner 2A,
A control device is provided that compares the temperature detected by the detector 16 with a predetermined set temperature and automatically controls the flow rate regulating valve 12 so that the detector 16 reaches the predetermined temperature.

Also, in the second circuit 3, the cooling use section 4
It is also possible to provide a device that automatically adjusts the valve 17 in A and the valve 18 in the heat storage circuit 4B to maintain the cold water temperature in the air conditioner 2B and the heat storage tank 8 at predetermined constant temperatures, respectively.

In this example, cooling water is supplied to middle and high-rise areas of high-rise buildings using a closed circulation type first system without a heat storage tank.
This can be done by circuit 3, so there is no waste of pumping power due to the difference in vertical head, and the extra cold heat of the refrigerator is reliably stored in the second circuit 4, and the pumping power is used to reduce heat loss due to cooling water falling. Now it can be used for low-rise or underground floors.

This eliminates the loss of power and heat associated with the circulation of cooling water, making it possible to achieve significant energy savings in this aspect as well.

Second Embodiment (See Figure 3) In the first embodiment, dampers 12 and 12' whose opening degrees are adjusted in mutually opposite directions are provided in both vaporized refrigerant paths 11A and 11B, and both paths 11A,
While keeping the amount of vaporized refrigerant sent to the compressor 10 by 11B substantially constant, the mutual ratio of the amounts of vaporized refrigerant passing through both paths 11A and 11B can be changed.

The rest of the structure is the same as that of the first embodiment.

Both of the above embodiments can be easily modified by combining one or more of the following.

A large number of the evaporators may be provided, such as three or more.

The amount of additives contained in the chilled water in each chilled water circuit is appropriate for the object to be cooled in each cooling circuit.

In both of the above embodiments, the refrigerator may be of an absorption type, in which case the compressor serves as an absorber and a regenerator. (These are collectively referred to as a pressurizing device.) In addition, in order to conveniently contrast with the drawings, reference numerals are written in the claims section, but the present invention is limited to the structure shown in the attached drawings. It is not something that will be done.

[Brief explanation of drawings]

The drawings show an embodiment of the cooling device according to the present invention,
Figure 1 is a piping diagram showing the first embodiment, Figure 2 is the piping diagram showing the first embodiment.
A simplified sectional view showing the refrigerator of the embodiment, FIG.
FIG. 2 is a simplified cross-sectional view showing an example. 2A... Air conditioner, 3, 4... Chilled water circuit, 4B... Heat storage circuit, 5A, 5B... Evaporator, 6A, 6B...
heat exchanger, 8... heat storage tank, 10... pressurizing device, 12,
12'...Flow control valve, 11A, 11B...Vaporized refrigerant path, A...Refrigerating machine.

Claims (1)

[Claims] 1. A first cold water circuit 3 for supplying cold water to a cooler 2A installed in a mid-to-high-rise area of a high-rise building is provided in a first evaporator 5A of a refrigerator A installed in a low-rise area or an underground area. A second cold water circuit 4 is connected to the heat exchanger 6A to form a closed circulation type circuit, and supplies cold water to the air conditioner 2B installed in the lower and underground parts of the building. Open type heat storage tank 8
A cooling device connected to the cooling device, in which a heat storage circuit 4B for supplying heat storage cold water to the heat storage tank 8 is connected to a heat exchanger 6B of the second evaporator 5B of the refrigerator A,
The first evaporator 5A and the second evaporator 5B are connected at substantially the same height position so that the liquefied refrigerant in both the evaporators 5A and 5B can mutually flow, and the first and second evaporators 5
A and 5B each have a vaporized refrigerant path 11 that supplies vaporized refrigerant to the pressurizing device 10 provided in the refrigerator A.
A, 11B, and at least one of the vaporized refrigerant paths 11A, 11B is provided with a flow rate regulating valve 12 that operates based on the detection result of the chilled water temperature of the first chilled water circuit 3. cooling equipment. 2. The flow rate adjustment valves 12, 12' are provided in each of the vaporized refrigerant paths 11A, 11B provided in the first and second evaporators 5A, 5B, respectively, and the flow rate adjustment valves 12, 12' are arranged in opposite directions. 2. The cooling device according to claim 1, wherein the cooling device is interlocked with each other so as to operate in the same manner.