JP2000304301A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system wherein energy saving and Installation saving are achieved by making the most of the merit of low temperature cold water manufactured with a low temperature cold source or the merit of low temperature air conditioning air manufactured with an air conditioner, and an indoor environment such as production of cold, draft in a room and drying in the room is prevented from being deteriorated. SOLUTION: Cooling air is blown out into a room 12 with an air conditioner 14 by making use of cold water at a low temperature of about 5 deg. C or lower manufactured by an ice storage apparatus 16, while an evaporator 44 is disposed in the room 12 for locally cooling the inside of the room 12 to circulate a refrigerant between it and a condenser 40. Further, as a cold source for condensing the refrigerant in the condenser 40 cold of the low temperature cold water manufactured in the low temperature cold heat source is utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system, and more particularly to an air conditioner which supplies cold water to a room by supplying low-temperature cold water to the air conditioner from a low-temperature cold heat source such as an ice storage device. The present invention relates to an air-conditioning system capable of saving energy and equipment by reducing the amount of air blown out.

[0002]

2. Description of the Related Art In recent years, a large number of devices, such as OA devices, acting as heating elements are provided in a room to be air-conditioned, such as an office building, and the room is often cooled and air-conditioned throughout the year. Has become. As a conventional air conditioning system for cooling, heat exchange is performed between cold water of about 7 ° C. supplied from a cold heat source such as a refrigerator to an air conditioner and air blown into a room to produce cooling air of 15 to 16 ° C. It was manufactured, and the manufactured conditioned air was blown into the room from the air conditioner. With this air conditioning, the indoor temperature in summer is air-conditioned to about 26 ° C. Therefore, the temperature difference between the temperature of the conditioned air manufactured by the air conditioner and the temperature of the room air (hereinafter, referred to as “air-conditioning air use temperature difference”).
Is about 10 ° C. On the other hand, the temperature of the cold water returning from the air conditioner to the cold heat source is about 12 ° C., and the “difference in cold water utilization temperature”, which is the difference between the temperature of the cold water produced by the cold heat source and the temperature of the cold water returning to the cold heat source, is about 5 ° C. ° C.

[0003] In particular, in air-conditioning air conditioning in summer, if the air-conditioning temperature is set in accordance with the interior zone of the room,
There is a disadvantage that cooling is not sufficiently performed in a perimeter zone in which the temperature rises due to the transmission of sunlight from a window or the outside air temperature from a wall. In particular, in the ceiling chamber air supply system in which the air-conditioned air produced by the air conditioner is once supplied to the above-the-ceiling chamber and then blown into the room from a plurality of blowers on the ceiling, the above-the-ceiling chamber is used as a pressure equalizing chamber. The amount of air blown out from the blower is almost constant. Therefore, if local cooling is not performed in the perimeter zone, the air-conditioning environment of the worker in the perimeter zone deteriorates. Conventionally, as a countermeasure, a fan coil unit including a chilled water coil and a fan is arranged separately from the air conditioner in the perimeter zone to perform local cooling.

By the way, the introduction of an air conditioning system using an ice heat storage device, which can greatly reduce running costs by producing ice at night by using nighttime electric power and producing cold water with ice during the day, is in progress. In the air conditioning system using this ice heat storage device, the temperature of cold water supplied to the air conditioner from the ice heat storage device, which is a low-temperature cold heat source, can be constantly kept at 5 ° C. or less. It is possible to produce conditioned air at a low temperature of about ° C. Therefore, if the low-temperature conditioned air is directly blown into the room, the above-described difference in the conditioned air utilization temperature can be increased, and the room can be cooled with a small amount of conditioned air. In addition, since the difference in cold water use temperature can be increased, low-temperature cold air can be obtained with a small amount of cold water. This makes it possible to reduce the amount of chilled water transported while maintaining the same cooling capacity as before, so that the chilled water piping can be made thinner and the transportation power cost of a pump and the like can be reduced. Furthermore, the air duct can be made thinner by reducing the amount of blown conditioned air, and the blowing power cost of the blower fan can be reduced. An air conditioning system using a low-temperature cold heat source like the air conditioning system using this ice heat storage device has an advantage that it greatly contributes to energy saving and equipment saving.

[0005] However, in the air conditioning system using the conventional ice heat storage device, the temperature of the cold water exchanged with air by the air conditioner is 10 ° C.
It is returned to the low-temperature chilled heat source while there is still enough available chilled heat of about ° C, so there is a problem that the merit of the low-temperature chilled heat source is not fully utilized in terms of chilled water usage temperature difference, that is, the usage efficiency of chilled water temperature. . Furthermore, the conventional air conditioning system using the ice heat storage device has a problem that when low-temperature conditioned air of about 9 to 11 ° C. is blown into a room, dew is formed at a duct or an outlet of the conditioned air.

As a countermeasure against dew condensation among the above-mentioned problems, Japanese Patent Laid-Open No. 6-193916 discloses a method of dehumidifying air-conditioned air supplied to a room with low-temperature cold water from a low-temperature cold heat source while cooling it to 14 ° C. or less. To prevent condensation.

[0007]

However, in the case of Japanese Patent Application Laid-Open No. 6-193916, the problem of dew condensation is certainly solved, but if the conditioned air cooled to 14 ° C. or less is blown directly into the room, the cool air hits. There is a problem of so-called cold draft, where people in the area feel cold. Therefore, conventionally, air-conditioning air for mixing warm return air from the room with air-conditioning air by an air conditioner is used, or an air-conditioning box for mixing warm return air with air-conditioning air is provided in the air supply duct. And so on.

Further, when dehumidified air is supplied into a room as disclosed in Japanese Patent Application Laid-Open No. 6-193916, the room is dried and the worker's skin is dried, or the throat is blown and a cold is easily caught. And the like. As described above, the conventional air conditioning system does not have a device configuration that makes full use of the advantages of a low-temperature cold heat source such as an ice heat storage device. Development is requested.

Further, if a fan coil unit is provided as a measure against the perimeter zone as in the prior art, there is a drawback that indoor air is dehumidified by dew condensation on the coil surface, and the room is further dried. Further, it is necessary to provide a chilled water pipe to the fan filter unit. However, there is a problem that a countermeasure against the water leakage and the dew condensation is required. From this, it is important to construct an air conditioning system using an ice heat storage device, including measures against the perimeter zone.

The present invention has been made in view of such circumstances, and has an advantage of low-temperature chilled water produced by a low-temperature chilled heat source such as an ice storage device, or low-temperature conditioned air produced by an air conditioner. It is an object of the present invention to provide an air conditioning system which can save energy and equipment by taking advantage of the above, and does not cause deterioration of the indoor environment such as generation of cold draft in the room and drying of the room.

[0011]

In order to achieve the above object, the present invention provides a low-temperature cold heat source for producing low-temperature cold water of about 5 ° C. or less, and conditioned air for cooling using the cold heat of the cold water. An air conditioner that manufactures an air conditioner, and a cold water circulation path that circulates the cold water between the low-temperature cold heat source and the air conditioner, wherein the air conditioning system blows out the conditioned air from the air conditioner into a room. A condenser is provided and an evaporator is provided in the chamber, and a refrigerant circulation path for circulating a refrigerant between the condenser and the evaporator is formed.In the condenser, refrigerant is exchanged by heat exchange between the cold water and the refrigerant. Condensing and liquefying, and the evaporator evaporates and vaporizes the liquefied refrigerant by heat exchange between the air in the room and the refrigerant, and performs local cooling of the room using the latent heat of evaporation. .

According to the present invention, cooling air is produced by an air conditioner using the cold heat of low-temperature cold water of about 5 ° C. or less produced by a low-temperature cold heat source and is blown into a room, while being condensed in a cold water circulation path. By providing an evaporator in the room and circulating the refrigerant circulation path in the room, the room is locally cooled using the latent heat of evaporation of the evaporator. As a result, the low-temperature chilled water produced by the low-temperature chilled heat source is used not only for producing air-conditioned air blown into the room from the air conditioner but also as a cold source for local air-conditioning. Can be increased. In this case, if the condenser is arranged at a position higher than the evaporator so that the refrigerant circulates naturally, there is no need for power for circulating the refrigerant. Also,
By installing a condenser on the outward path where low-temperature chilled water flows from the low-temperature chilled heat source in the chilled water circulation path to the air conditioner, the chilled heat of the low-temperature chilled water is consumed for local cooling, and the air-conditioning air blown into the room from the air conditioner and the low- The temperature of the conditioned air does not drop too much in the cold heat exchange. Therefore, it is possible to solve the problem that the temperature of the conditioned air is too low to cause dew condensation, so that it is not necessary to supply the dehumidified conditioned air from the air conditioner to the room as in the related art. Therefore, the disadvantage that the room is dried and the air-conditioning environment deteriorates can be eliminated. On the other hand, since the cooling capacity of the conditioned air can be increased by using the low-temperature chilled water, the conventional cooling capacity can be maintained even if the chilled water circulation path is narrowed, so that the equipment can be saved.

According to another aspect of the present invention, there is provided an air conditioning system having an air conditioner for blowing cooling air at a temperature of about 14 ° C. or less into a room through a duct. An evaporator is provided in the chamber together with, and a refrigerant circulation path for circulating a refrigerant is formed between the condenser and the evaporator, and the condenser is formed by heat exchange between the air flowing through the duct and the refrigerant. While condensing and liquefying cold heat, the evaporator evaporates and vaporizes the liquefied refrigerant by heat exchange between the air and the refrigerant in the room, and performs local cooling of the room using the latent heat of evaporation. I do.

According to the present invention, an air conditioner produces cooling air of about 14 ° C. or less and blows the air into a room through a duct, while installing an evaporator at a local cooling location in the room for local cooling in the room. The cooling medium is circulated between the cooling medium and the condenser, and the cooling heat of the cooling air flowing in the duct is used as a cooling heat source for condensing the cooling medium in the condenser.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an air conditioning system according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram illustrating a first embodiment of an air conditioning system of the present invention.

As shown in FIG. 1, a first embodiment of an air conditioning system 10 according to the present invention mainly includes an air conditioner 14 for supplying conditioned air for cooling into a room 12 such as an office building to be air conditioned. And an ice heat storage device 16 (low-temperature cold heat source) for supplying low-temperature cold water of about 5 ° C. or less to the air conditioner 14, and a local cooling device 18 using the cold water produced by the ice heat storage device 16 as a cold heat source. Is done.

The ice heat storage device 16 and the cooling coil 20 of the air conditioner 14 are connected by a chilled water circulation path 26 composed of a forward pipe 22 and a return pipe 24, and a circulation pump 28 is provided in the return pipe 24. Is done. Then, low-temperature cold water of about 5 ° C. or less produced by the ice heat storage device 16
The water is sent directly to the air conditioner 14 through the air conditioner. Cold cold water is
The temperature does not need to be strictly 5 ° C. or lower, and may be any temperature that has sufficiently higher cooling heat than that used for producing conditioned air for cooling in a normal air conditioning system. on the other hand,
Fresh air is introduced into the air conditioner 14 through an outside air introduction pipe 30, and return air in the room 12 is circulated through a return air duct 32 and mixed by the air conditioner 14. The mixed air exchanges heat with cold water flowing through the cooling coil 20 to be cooled to a desired temperature. The conditioned air for cooling produced in this manner is supplied to a plurality of blowers 38, 38 arranged on a ceiling surface 37 via an air supply duct 36 by an air conditioner fan 34.
, And is blown out of the blower 38 into the chamber 12. On the other hand, the chilled water whose temperature has been increased by heat exchange in the air conditioner 14 exchanges heat with the refrigerant of the local cooling device 18 to increase the temperature and return to the ice heat storage device 16.

As shown in FIGS. 1 and 2, the local cooling device 18 mainly includes a condenser 40 disposed in the return pipe 24 of the chilled water circulation path 26 and an evaporator / discharger disposed in the chamber 12.
It is composed of an integrated blower unit 42 and a refrigerant circulation path 46 that circulates refrigerant between the condenser 40 and the evaporator 44. In this case, the condenser 40 is disposed at a position higher than the evaporator 44 so that the refrigerant is supplied to the condenser 40 and the evaporator 44.
Make a natural circulation between and. That is, the refrigerant is cooled and condensed and liquefied by heat exchange with low-temperature cold water in the condenser 40, and the liquefied refrigerant naturally flows down the outward pipe 48 of the refrigerant circulation path 46 and reaches the evaporator 44. Evaporator 44
Is heated by heat exchange with the warm air in the chamber 12 in the evaporator 44 to evaporate and vaporize, and the vaporized refrigerant naturally rises in the return pipe 50 of the refrigerant circuit 26 and the condenser 40 Is returned to. Thus, the refrigerant circulation path 46
In the closed system, the refrigerant circulates spontaneously due to the difference in gas-liquid density even if power is not externally applied while repeating condensation / liquefaction and evaporation / vaporization. Then, ambient heat is absorbed by latent heat of evaporation when the refrigerant evaporates and vaporizes in the evaporator 44.

An integrated evaporator / blower unit 42
Can be obtained by adding a blower 52 to the evaporator 44 to the outlet 5
4 and a structure housed in a casing 58 having a suction port 56. Then, the air in the chamber 12 is sucked into the casing 58 from the suction port 56 and cooled by the evaporator 44, and the cooled air is blown out from the outlet 54. Thereby, the cooling efficiency of the local cooling can be increased as compared with the case where the evaporator 44 is simply provided in the chamber 12. In this case, if a filter (not shown) is provided in at least one of the outlet 56 and the inlet 54, the air in the chamber 12 and the local cooling can be shared. For example, the evaporator / blower unit 42 is disposed in a so-called perimeter zone such as a window 60 where the temperature rise is large due to sunlight or an area where the temperature rise is large due to a heating element such as OA equipment. Is preferred.

The operation of the air-conditioning system according to the first embodiment of the present invention configured as described above will be described. The low-temperature chilled water of about 5 ° C. or less produced by the ice heat storage device 16 flows through the chilled water circulation path 26, reaches the air conditioner 14, and heats up to about 10 ° C. by exchanging heat with the mixed air in the air conditioner 14. I do. On the other hand, the conditioned air for cooling produced by heat exchange with cold water in the air conditioner 14 is sent to the blower 38 through the air supply duct 36, and is blown into the chamber 12 from the blower 38.

Next, heat exchange in the air conditioner 14
The chilled water that has been heated up to ° C is
4, heat is exchanged with the refrigerant in the condenser 40 disposed in
The temperature is raised to about 15 ° C., and the process returns to the ice heat storage device 16. On the other hand, the refrigerant cooled and condensed and liquefied by the condenser 40 naturally flows down the refrigerant circulation path 46 and reaches the evaporator 44, where the refrigerant exchanges heat with the warm air in the chamber 12 and evaporates and vaporizes. . The air cooled by the latent heat of vaporization of the refrigerant is blown into the chamber 12 by the blower 52. Thereby, the perimeter zone in the room 12 is locally cooled.

As described above, by utilizing the advantage of the ice regenerator 16 that can produce cold water at a low temperature of 5 ° C. or less, not only the cold heat of the cold water is used for producing the conditioned air by the air conditioner 14, but also The condenser 40 is used for condensing and liquefying the refrigerant. As a result, the temperature of the chilled water at about 5 ° C. or lower when exiting the ice heat storage device 16 rises to about 15 ° C. when returning to the ice heat storage device 16. Therefore, the “cold water use temperature difference” is about 10 ° C. (15 ° C.-5 ° C.), and the use efficiency of the cold water can be increased to twice the conventional “cold water use temperature difference” of about 5 ° C.

Further, the use of low-temperature cold water of about 5 ° C. or less makes it possible to increase the heat transfer density of cold heat, so that the amount of circulating cold water can be reduced. This allows
Even if the pipe diameter of the chilled water circulation path 26 is reduced, the conventional cooling capacity can be maintained, so that the equipment can be saved. In addition, the local cooling device 1
8, the refrigerant naturally circulates between the condenser 40 and the evaporator 44, so that a special transport device such as a circulation pump for circulating the refrigerant is not required. Therefore, energy is saved.

Further, the local cooling device 18 using the condenser 40 and the evaporator 44 uses the latent heat when the refrigerant evaporates by the heat exchange between the refrigerant and the indoor air in the evaporator 44, so that the cold water and the indoor air are used. The heat transfer density can be higher than that of a conventional fan filter unit that performs local cooling by heat exchange with the fan filter unit. Thus, the pipe diameter of the refrigerant circulation path 46 can be reduced, and the equipment can be saved.

Further, as in the local cooling device 18 using the condenser 40 and the evaporator 44, the evaporation temperature of the refrigerant naturally circulating in the closed system depends on the temperature of the chilled water on the side of the condenser 40 and the temperature of the air in the chamber 12. It is almost the middle temperature. This allows, for example,
When the cold water temperature on the condenser 40 side is 5 ° C. and the air temperature in the chamber 12 is 26 ° C., the surface temperature of the evaporator 44 is about 15 °, and the indoor humidity is 50% (the indoor temperature is 26 ° C.). However, no condensation occurs on the surface of the evaporator 44. Therefore, the humidity is not deprived from the indoor air due to the dew condensation, so that the inside of the room 12 is not dried and the air conditioning environment in the room 12 is not deteriorated.

In the first embodiment, the condenser 40 of the local cooling device 18 is provided in the return pipe 24 of the chilled water circulation path 26. However, the condenser 40 is provided in the outward pipe 22. Is also good. In this case, the temperature of the conditioned air produced by the air conditioner 14 can be prevented from being too low by first exchanging the heat of the cold water in the condenser 40 to raise the temperature of the cold water, and then sending it to the air conditioner 14. As a result, it is possible to prevent the problems of dew condensation and cold draft caused by the temperature of the conditioned air produced by the air conditioner 14 being too low. Therefore,
If the temperature of the chilled water is considerably lower than 5 ° C. and the condenser 40 is disposed in the return pipe 24 of the chilled water circulation path 26, causing the problem of dew condensation or cold draft, the condenser 40 is disposed in the outgoing pipe 22. It is preferable to provide them. In the case of the local cooling device 18, as described above, since the evaporation temperature of the refrigerant is approximately halfway between the chilled water temperature on the condenser 40 side and the air temperature in the chamber 12, the chilled water temperature on the condenser 40 side Even if the temperature is too low, problems such as condensation and cold draft hardly occur. This eliminates the need to send dehumidified conditioned air from the air conditioner 14 to the interior of the room 12 as in the prior art in order to solve the problem of dew condensation, so that the interior of the room 12 dries and the air conditioning environment deteriorates. Can be eliminated.

FIG. 3 is an overall configuration diagram illustrating an air conditioning system according to a second embodiment of the present invention. The same devices and members as in the first embodiment are denoted by the same reference numerals. As shown in FIG. 3, a second embodiment of the air conditioning system 10 according to the present invention mainly includes an air conditioner 14 for supplying conditioned air for cooling to a room 12 such as an office building to be air conditioned.
And an ice heat storage device 16 for supplying low-temperature cold water to the air conditioner 14.
(Low-temperature cooling heat source) and a local cooling device 70 using cooling air-conditioning air produced by the air conditioner 14 as a cooling heat source. That is, in the first embodiment, the cooling source of the local cooling device 40 is the cold water for producing the conditioned air by the air conditioner 14, whereas in the second embodiment, the local cooling device 7 is used.
The difference is that the cold heat source 0 is conditioned air having a low temperature of about 14 ° C. or less produced by conditioned air. In the second embodiment, the air-conditioned air produced by the air conditioner 14 is supplied to the ceiling chamber 72 through the air supply duct 36, and the air-conditioned air in the ceiling chamber 72 flows to the ceiling surface 37. It was configured to be blown into the chamber 12 from a plurality of blowers 38 arranged.

The provision of a chilled water circulation path 26 between the ice heat storage device 16 and the cooling coil of the air conditioner 14 to produce conditioned air for cooling in the air conditioner 14 is the same as in the first embodiment. In the second embodiment, the condenser 40 of the local cooling device 70 is provided at the end of the air supply duct 36 that supplies the conditioned air to the under-chamber 72.
A refrigerant circulation path 46 for circulating a refrigerant is provided between the evaporator and the evaporator 44 of the evaporator / blower unit 42. In this case as well, as shown in FIG. 4, the condenser 40 is arranged at a position higher than the evaporator 44, and the refrigerant flows between the condenser 40 and the evaporator 44 as in the first embodiment. To make it circulate naturally.

The operation of the air-conditioning system according to the second embodiment of the present invention configured as described above will be described. Air conditioner 1
4 uses the cold heat of low-temperature cold water of about 5 ° C. or less produced by the ice heat storage device 16 to produce conditioned air for cooling at about 14 ° C. or less. The temperature of the conditioned air here is exactly 14 °
The temperature does not need to be equal to or lower than C, but may be any conditioned air having a temperature that is sufficiently higher than the conditioned air for cooling in a normal air conditioning system. The conditioned air produced by the air conditioner 14 exchanges heat with the refrigerant in the condenser 40 disposed at the end of the air supply duct 36 to condense and liquefy the refrigerant. The conditioned air heated by the heat exchange with the refrigerant is sent to the under-chamber 72 and blown out of the blower 38 into the chamber 12. On the other hand, the refrigerant cooled and condensed and liquefied by the conditioned air naturally flows down the outward pipe 48 of the refrigerant circulation path 46 and reaches the evaporator 44 of the evaporator / blower unit 42.
It evaporates and evaporates by exchanging heat with the warm air inside. And
Air cooled by the latent heat of vaporization of the refrigerant is blown into the chamber 12 by the blower 52. Thus, room 1
2. Locally cool the perimeter zone in 2.

Thus, in the second embodiment, about 1
By utilizing the advantage of the air conditioner 14 that produces conditioned air at a low temperature of 4 ° C. or less, the “air-conditioned air use temperature difference” that is the temperature difference between the temperature of the conditioned air produced by the air conditioner 14 and the room temperature is reduced. Can be bigger. Thereby, the utilization efficiency of the conditioned air can be increased more than the conventional “difference in the temperature for using the conditioned air” of about 10 ° C.

Further, by using low-temperature conditioned air of about 14 ° C. or less, the heat transfer density of cold heat can be made higher than the heat transfer density of the conventional fan filter unit. The air volume of the conditioned air supplied into the chamber 12 can also be reduced. As a result, even if the diameter of the air supply duct 36 is reduced, the conventional cooling capacity can be maintained, and the equipment can be saved.

The temperature of about 14 ° C.
The problem of the cold draft can be solved by raising the temperature of the following low-temperature conditioned air by heat exchange in the condenser 40 and then supplying the air into the chamber 12. Therefore, unlike the related art, there is no need to use an air conditioner for air mixing or an air mixing box. Also, in the case of the second embodiment, similarly to the first embodiment, the local cooling device 70 includes the condenser 40 and the evaporator 4.
Since a system in which the refrigerant is naturally circulated during 4 is adopted, no special power device such as a circulation pump for circulating the refrigerant is required. Therefore, energy is saved.

Further, in the local cooling device 70 using the condenser 40 and the evaporator 44, as in the first embodiment, no dew condensation occurs on the surface of the evaporator 44, so that humidity is taken from the indoor air. Nothing. The advantage of the natural circulation type local cooling device 70 is that the air temperature difference between the inlet of the condenser 40 and the inlet of the evaporator 44, that is, the temperature of the conditioned air before heat exchange with the refrigerant in the condenser 40 (hereinafter referred to as "air conditioning"). A temperature difference (heat load) between the temperature of the indoor air that exchanges heat with the refrigerant in the evaporator 44) and the amount of the refrigerant circulating in the refrigerant circulation path 46 automatically changes. Is to have. Thereby, the local cooling device 70 performs autonomous control such that when the heat load of the local cooling location in the room 12 increases, the amount of circulation of the refrigerant increases and the cooling capacity automatically increases. Conversely, if the heat load is reduced, the autonomous control is performed so that the circulation amount of the refrigerant is reduced and the cooling capacity is automatically reduced. Therefore, as described in FIGS. 5 and 6, the cooling capacity can be automatically adjusted according to the heat load without any special control means for controlling the circulation amount of the refrigerant.

FIG. 5 shows the cooling capacity of the local cooling device 70 based on the room temperature of 26 ° C. as a capacity ratio. As shown in FIG. 5, the room temperature of 24 ° C. and 11 ° C.
When the temperature difference at the air conditioner outlet temperature is 13 ° C., the cooling capacity ratio is 87%, and when the temperature difference is 14 ° C., the cooling capacity ratio is 93%. Similarly, the temperature difference 15
The cooling capacity ratio at 93 ° C is 93%, the cooling capacity ratio is 107% at 16 ° C, and the cooling capacity ratio is 1 at 17 ° C.
13%. That is, assuming that the cooling capacity ratio does not change and the cooling capacity ratio fluctuates by ± 15% on the basis of 100% when the indoor temperature is 26 ° C. where the cooling capacity ratio does not change, the cooling capacity is autonomously controlled. Thereby, when the heat load of the perimeter zone in the room 12 increases, the circulation amount of the refrigerant automatically increases to increase the cooling capacity and adjust the room temperature to 26 ° C. Then, the ± 15% variation in the cooling capacity ratio corresponds to ± 2 ° C. in terms of temperature change, as can be seen from the horizontal axis of FIG.

FIG. 6 shows changes in the air conditioning load in the perimeter zone affected by the temperature of the outside air and the effects of solar radiation in a general small- to medium-sized building having an air conditioning area of about 6000 m ² . In FIG. 6, the bar graph shows the heat load per unit area of the perimeter zone (kg / m ^2.
h) is shown as a change with time from 9:00 to 17:00, and the line graph shows the ratio (%) of the heat load to the average value of the heat load as a change with time from 9:00 to 17:00. . As can be seen from FIG. 6, the heat load per unit area of the perimeter zone increases from morning to noon and decreases gradually in the evening. Due to the change in the heat load, the ratio of the heat load in the perimeter zone fluctuates by about ± 15% with respect to 100% in which the ratio of the heat load does not change. Therefore, when this result is superimposed on the autonomous control of the cooling capacity of the local cooling device 70 shown in FIG. 5, the autonomous control is performed even if the air temperature in the chamber 12 sucked into the evaporator 44 fluctuates by ± 2 ° C. It can be understood that this can be dealt with. Even if the cooling capacity of the local cooling device 70 exceeds the range of the autonomous control, if the air temperature in the chamber 12 sucked into the evaporator 44 fluctuates to the plus side, the flow rate of the refrigerant such as a valve (not shown) The provision of the control means in the refrigerant circuit 46 makes it possible to easily cope with the problem.

[0036]

As described above, according to the air conditioning system of the present invention, it is possible to save energy and equipment by taking advantage of low-temperature cold water produced by a low-temperature cold heat source.
In addition, it is possible to prevent the deterioration of the indoor environment such as the occurrence of cold draft in the room and the drying of the room.

Further, according to the present invention, it is possible to save energy and equipment by taking advantage of low-temperature conditioned air manufactured by an air conditioner, and to generate cold draft in the room or dry the room. The deterioration of the indoor environment can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram illustrating a first embodiment of an air conditioning system of the present invention.

FIG. 2 is an explanatory diagram illustrating a local cooling device according to the first embodiment.

FIG. 3 is an overall configuration diagram illustrating a second embodiment of the air conditioning system of the present invention.

FIG. 4 is an explanatory diagram illustrating a local cooling device according to a second embodiment.

FIG. 5 is an explanatory diagram illustrating autonomous control in a local cooling device.

FIG. 6 is an explanatory diagram for explaining a temporal change of a heat load amount per unit area and a heat load ratio in a perimeter zone.

[Explanation of symbols]

10 ... air conditioning system, 12 ... room, 14 ... air conditioner, 16 ...
Ice heat storage device, 18, 70: Local cooling device, 26: Cold water circuit, 40: Condenser, 42: Evaporator / blower unit, 44: Evaporator, 46: Refrigerant circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Noboru Oshima, 1-11-1 Uchikanda, Chiyoda-ku, Tokyo Inside the Hitachi Plant Construction Co., Ltd. (72) Minoru Takahashi 1-1-1, Uchikanda, Chiyoda-ku, Tokyo No. 14 Hitachi Plant Construction Co., Ltd.

Claims (5)

[Claims] 1. A low-temperature cold heat source for producing low-temperature cold water of about 5 ° C. or less, an air conditioner for producing air-conditioning air for cooling using the cold heat of said cold water, and said low-temperature cold heat source for said cold water. A cooling water circulation path for circulating between the air conditioning apparatus and the air conditioning system, wherein the air conditioning system blows out the conditioned air from the air conditioning apparatus to a room, wherein a condenser is provided in the cooling water circulation path and an evaporator is provided in the room. Forming a refrigerant circulation path for circulating the refrigerant between the condenser and the evaporator; condensing and liquefying the refrigerant by heat exchange between the cold water and the refrigerant in the condenser; And evaporates the liquefied refrigerant by heat exchange between the refrigerant and the refrigerant.
An air conditioning system characterized by performing local cooling of a room by vaporizing and utilizing the latent heat of evaporation. 2. The air conditioning system according to claim 1, wherein the condenser is disposed in a return path of the chilled water circulation path in which chilled water returns from the air conditioner to the low-temperature chilled heat source. 3. The air conditioning system according to claim 1, wherein the condenser is disposed in an outgoing path of the chilled water circulation path in which chilled water is supplied from the low-temperature chilled heat source to the air conditioner. 4. An air conditioning system provided with an air conditioner for blowing air for cooling at a temperature of about 14 ° C. or lower into a room through a duct, wherein a condenser is provided in the duct and an evaporator is provided in the room. Forming a refrigerant circulation path for circulating a refrigerant between the vessel and the evaporator, wherein the condenser condenses and liquefies the cold heat by heat exchange between the air flowing through the duct and the refrigerant, and the evaporator. In the air conditioning system, the liquefied refrigerant is evaporated and vaporized by heat exchange between the indoor air and the refrigerant, and the indoor latent cooling is performed using the latent heat of evaporation. 5. The refrigerant circuit according to claim 1, wherein the condenser is disposed at a position higher than the evaporator, and the refrigerant naturally circulates in a closed system of a refrigerant circuit. Air conditioning system.