JP2001165488A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance cooling efficiency of a thermal storage tank type air conditioner. SOLUTION: A thermal storage tank 1 comprises a high temperature tank 3 and a low temperature tank 4, where the temperature of cold water in the high temperature tank 3 is set at 19 deg.C on the high temperature side and the temperature of cold water in the low temperature tank 4 is set at 7 deg.C on the low temperature side. Cold water is pumped up from the high temperature tank 3 and the low temperature tank 4 through suction pipes 5, 21 by means of a cold water primary pump 6 and mixed through a two-way mixing valve 20. After the temperature of the mixed water is settled at the specified temperature on the inlet side of the refrigerating machine 7, i.e., 12 deg.C, the mixed water is fed to the refrigerating machine 7 where it is cooled down to 7 deg.C and fed to the low temperature tank 4. A temperature sensor 9 is provided on the inlet side of the refrigerating machine 7 and the two-way mixing valve 20 is controlled through a temperature setter 10 such that the temperature on the inlet side will be constant. Furthermore, the low temperature side cold water of 7 deg.C is fed from the low temperature tank 4 through a suction pipe 13 to an air conditioner 15 by means of a secondary pump 14. The air conditioner 15 cools the surroundings through heat exchange and the cold water having temperature of 19 deg.C elevated through heat exchange is returned back to the high temperature tank 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a heat storage tank, a refrigerator for primary cooling, and an air conditioner for cooling the surroundings by exchanging heat with cold water from the refrigerator. It relates to a device having improved cooling efficiency.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 63-161341 discloses a regenerative air conditioner, which is configured to control the outlet temperature of a refrigerator constant. FIG. 3 shows a piping diagram of an example of such an air conditioner. In this figure, a heat storage tank 1 is divided into a high temperature tank 3 and a low temperature tank 4 by a partition wall 2.
Both tanks communicate with each other below the partition wall 2. Relatively high-temperature cold water in the high-temperature tank 3 is supplied from the suction pipe 5 to the cold water primary pump 6.
And is sent to the refrigerator 7 where it is cooled.
Sent to

A control valve 8 compares a control valve 8 with a preset temperature based on a water temperature detected by a temperature sensor 9 provided at the outlet side of the refrigerator 7.
When the temperature is higher than the predetermined temperature, the gas is returned from the high-temperature side bypass pipe 11 to the high-temperature tank 3, and in the opposite case, the liquid flows from the low-temperature pipe 12 to the low-temperature tank 4.

In the low-temperature tank 4, low-temperature cold water sent from the refrigerator 7 is stored, and a part of the cold water is sucked up by the cold water secondary pump 14 from the water suction pipe 13 and sent to the air conditioner 15. The heat is exchanged, and the air conditioner 15 cools the surroundings. At this time, the high-temperature cold water whose temperature has increased is returned from the return pipe 16 to the high-temperature tank 3.

[0005]

However, in the conventional example shown in FIG. 3, since the capacity of the refrigerator 7 is limited,
The inlet side temperature of the cold water sent from the cold water primary pump 6 is
If the temperature is higher than the inlet specification temperature preset in the refrigerator 7, the performance of the refrigerator 7 is reduced. The air conditioner 15
If the temperature of the cold water returning to the high-temperature tank 3 from the inlet is lower than the specified temperature at the entrance, the capacity also decreases.

For example, if the inlet specification temperature is 12 ° C. and the cold water temperature of the high temperature tank 3 is 19 ° C., the inlet side temperature is also 19 ° C., which is higher than the inlet specification temperature 12 ° C. The temperature of the cold water at the outlet side, that is, the outlet side temperature is at most 14 ° C., and does not become the upper limit temperature 12 ° C. of the low temperature tank 4 side. As a result, when the cold water of 12 ° C. is sent to the air conditioner 15 and the cold water of 19 ° C. is returned from the air conditioner 15 to the high-temperature tank 3, the air conditioner 15 is set to a temperature higher than the upper limit temperature of 12 ° C. The supply of the chilled water at a temperature of 0 ° C. reduces the capacity of the air conditioner 15 and the temperature of the chilled water returning from the air conditioner 15 is also higher than 19 ° C., so that the temperature of the chilled water in the high-temperature tank 3 rises and the entrance side of the refrigerator 7 The temperature tends to be even higher.

[0007] If the temperature of the chilled water entering the refrigerator 7 is not constant, the temperature at the outlet side will also vary,
The cold water temperature on the low temperature side in the low temperature tank 4 also varies, and as a result, the air conditioning capacity of the air conditioner 15 decreases. If the air-conditioning capacity decreases, more refrigerators 7 must be added, and a large capital investment is required. Therefore, it is necessary to sufficiently bring out the performance of the air conditioner 15, and for this purpose, it is effective to keep the cold water temperature at the entrance side of the refrigerator 7 constant. In addition, in order to make full use of the capacity of the refrigerator 7, it is necessary to set the temperature at the inlet specification. The present invention has been made based on the investigation of such facts, and aims at providing an efficient air conditioner.

[0008]

In order to solve the above-mentioned problems, an air conditioner according to the present invention comprises a heat storage tank for storing cold water having different temperatures, and a refrigeration system for temporarily cooling the cold water on the high temperature side of the heat storage tank. And an air conditioner that cools the surroundings by exchanging heat with the low-temperature side cold water stored in the heat storage tank from the refrigerator so that the heated cold water after the heat exchange is returned to the heat storage tank and circulated. The above-described VX is characterized in that a mixing unit is provided which mixes each of the cold water on the high temperature side and the low temperature side of the heat storage tank to a predetermined temperature and then sends the mixed water to the refrigerator.

[0009]

According to the present invention, a mixing section is provided at the entrance of the refrigerator to keep the temperature at the entrance of the refrigerator constant. Therefore, if the temperature at the entrance side of the refrigerator matches the specified temperature, the refrigerator can always be operated most efficiently. Since the system can be operated to achieve sufficient performance and the outlet side temperature is constant, the cold water temperature on the low temperature tank side is also sufficiently low and constant, and as a result, the performance of the air conditioner is fully exhibited As a result, the cooling efficiency can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to the drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and duplicate description will be omitted. In this figure, a water suction pipe 5 of a high-temperature tank 3 is connected to a cold water primary pump 6 via a mixing two-way valve 20. Further, the mixing two-way valve 20 is also connected to a water suction pipe 21 for sucking low-temperature water from the low-temperature tank 4 side. The two mixing two-way valves 20 and the respective ends of the water suction pipes 5 and 22 form a mixing section 22.
Is configured.

The mixing two-way valve 20 is connected to the cold water primary pump 6.
The opening / closing of the mixed water is controlled by the temperature setting device 10 based on the outlet temperature of the mixed water detected by the temperature sensor 9 provided at the outlet of the chilled water, and the mixed water is sent from the cold water primary pump 6 to the refrigerator 7.
The inlet-side specification temperature of the refrigerator in the present embodiment is 12 ° C., and the temperature of the mixed water is controlled to maintain the same 12 ° C.

When the refrigerator 7 is operated most efficiently and exhibits sufficient performance, it has a performance of cooling the cold water at the outlet side to 7 ° C. When the mixed water is supplied, the refrigerator 7 becomes the most efficient, and cools the outlet side cold water to 7 ° C.

[0013] The cold water from the refrigerator 7 is sent from the water pipe 22 to the low-temperature tank 4, and the temperature of the cold water in the low-temperature tank 4 is set to 7 ° C.
The cold water on the low temperature side is sent to the air conditioner 15 from the water suction pipe 13 by the cold water secondary pump 14 as in the conventional case.
The upper limit set temperature of the chilled water supplied to the chiller and the chilled water temperature returned from the air conditioner 15 are 12 ° C. and 19 ° C., respectively, as in the conventional example.
Then, since the temperature of the supplied cold water is sufficiently low at 7 ° C., heat exchange with a sufficient amount of energy is performed, and the air conditioner 15 can sufficiently exhibit its performance.

As described above, according to the present embodiment, since the mixing section 22 including the water absorption pipe 5, the water absorption pipe 21, and the mixing two-way valve 20 is provided, the cold water sent from the cold water primary pump 6 to the refrigerator 7 is provided. Can be lowered sufficiently to 12 ° C., which is the inlet-side specification temperature of the refrigerator 7, as a result, the performance of the refrigerator 7 can be sufficiently exhibited and the cooling efficiency can be improved. In addition, since the temperature sensor 9 is provided on the entrance side of the refrigerator 7, the temperature on the entrance side of the refrigerator 7 can be kept constant at the inlet side specification temperature of 12 ° C., so that the high performance of the refrigerator 7 can be maintained. In addition, the temperature on the outlet side of the refrigerator 7 can be kept constant.

Further, since the outlet side temperature of the refrigerator 7 becomes constant, the low-temperature side cold water temperature of the low-temperature tank 4 can be stabilized, and the temperature can be sufficiently lowered as compared with the conventional case, so that the performance of the air conditioner 15 can be sufficiently exhibited. Cooling efficiency can be improved. Therefore, it is possible to avoid an increase in the investment amount due to the addition of a large number of refrigerators 7, and to reduce energy loss due to inefficient operation.

Next, another embodiment will be described with reference to FIG. FIG. 2 shows an example in which only the mixing unit is changed from the apparatus shown in FIG. That is, it is characterized in that the mixing section 22 is provided with the mixing three-way valve 30. In this way, the mixing valves can be integrated into one mixing three-way valve 30, and the device can be made compact. In this figure, the air conditioner side is omitted, but these omitted parts are the same as in FIG.

[Brief description of the drawings]

FIG. 1 is a piping diagram according to a first embodiment.

FIG. 2 is the same drawing according to a second embodiment.

FIG. 3 is the same view as in the conventional example.

[Explanation of symbols]

1: heat storage tank, 2: partition wall, 3: high temperature tank, 4: low temperature tank,
6: cold water primary pump, 7: refrigerator, 9: temperature sensor, 1
0: temperature setting device, 15: air conditioner, 20: mixing two-way valve, 22: mixing part, 30: mixing three-way valve

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[Procedure amendment]

[Submission date] January 21, 2000 (2000.1.2
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

In order to solve the above-mentioned problems, an air conditioner according to the present invention comprises a heat storage tank for storing cold water having different temperatures, and a refrigeration system for temporarily cooling the cold water on the high temperature side of the heat storage tank. And an air conditioner that exchanges heat with the low-temperature side cold water stored in the heat storage tank from the refrigerator to cool the surroundings, so that the heated cold water after the heat exchange is returned to the heat storage tank and circulated. In the air conditioner described above , a mixing unit is provided which mixes each of the cold water on the high-temperature side and the low-temperature side of the heat storage tank to a predetermined temperature and sends the mixed water to the refrigerator.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunihiko Nagata, Inventor: 1500, Hirakawa, Otsu-cho, Otsu-cho, Kikuchi-gun, Kumamoto Honda Motor Co., Ltd. Inside Honda Motor Co., Ltd.Kumamoto Factory (72) Inventor Junichi Ishibashi 1500 Hirakawa, Otsu-machi, Kikuchi-gun, Kumamoto Prefecture F-term in Kumamoto Factory, Honda Motor Co., Ltd. 3L060 AA03 CC05 DD01 EE31 EE33 EE41

Claims (2)

[Claims] 1. A heat storage tank for storing cold water having different temperatures, a refrigerator for primarily cooling cold water on the high-temperature side of the heat storage tank, and a low-temperature cold water stored in the heat storage tank from the refrigerator. An air conditioner that cools the surroundings by heat exchange, and returns the circulated cold water after heat exchange to the heat storage tank and circulates the chilled water on the high temperature side and the low temperature side of the heat storage tank at a predetermined temperature. An air conditioner comprising a mixing section for mixing the mixed water and sending the mixed water to a refrigerator. 2. A water temperature sensor is provided at an entrance side of the refrigerator,
The air conditioner according to claim 1, wherein the temperature of the mixed water is controlled based on the water temperature sensor.