JP2004271078A - Cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system having further reduced power consumption by efficiently utilizing an assisting device. <P>SOLUTION: Heat absorbed during assisting the refrigerating operation of a refrigerator 4 by an electronic refrigerator 20 serving as the assisting device is given as operating heat energy to the refrigerator 4. Thus, compared with conventional one, where the operating heat energy is only given to the refrigerator 4 by the assisting device such as a vapor compression refrigerator or a heater or a second heating element 3 is cooled by refrigerating capability generated by the vapor compression refrigerator, the cooling system has further reduced power consumption because of the efficient utilization of the electronic refrigerator 20 as the assisting device. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling system that cools a heating element disposed in a closed space, and is effective for use in cooling electronic devices, electric devices, electric converters, batteries, and the like in a mobile phone base station, for example. .
[0002]
[Prior art]
The conventional cooling system circulates cooling water, which collects waste heat from heating elements such as electric equipment installed in the mobile phone base station, by a pump, supplies it to the adsorption refrigerator, and generates it by the adsorption refrigerator. The other heating elements are cooled by the generated cold heat (for example, see Patent Document 1).
[0003]
By the way, in the invention described in Patent Document 1, since the second heating element is cooled by the adsorption-type refrigerator operated by using the waste heat generated by the first heating element as operating energy, the outside air temperature is high and the heat radiation capability is reduced. If the amount of waste heat generated by the first heating element and the temperature become low, the adsorption refrigerator cannot exhibit sufficient refrigerating capacity, and the cooling capacity of the cooling system decreases. There are issues.
[0004]
In order to solve this problem, the invention described in Patent Document 1 heats a heat medium having recovered waste heat in a heater or a high-temperature heat exchanger of a vapor compression refrigerator, or heats a heat medium of a low temperature side of the vapor compression refrigerator. The cooling capacity of the cooling system is supplemented by supplementing the cooling capacity with a heat exchanger.
[0005]
[Patent Document 1]
JP-A-2002-100891
[Problems to be solved by the invention]
However, in the invention described in Patent Literature 1, it is hard to say that auxiliary devices such as a vapor compression refrigerator and a heater are efficiently used for the reasons described below.
[0007]
In view of the above points, the present invention firstly provides a new cooling system different from the conventional one, and secondly, further reduces the power consumption of the cooling system by efficiently using the auxiliary device. Aim.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, heat is absorbed from a first heating element (2) existing in a closed space (1), and the absorbed heat is used for operation. A cooling system provided with a refrigerator (4) for cooling a second heating element (3) existing in a closed space (1) as energy of the cooling device, wherein heat is applied to the refrigerator (4); Auxiliary devices (20, 30) for assisting the refrigerating operation of the refrigerator (4). The auxiliary devices (20, 30) reject the heat absorbed when assisting the refrigerating operation of the refrigerator (4). (4).
[0009]
Thereby, the auxiliary device (20, 30) of the present invention gives the heat absorbed when assisting the refrigerating action of the refrigerator (4) to the refrigerator (4) as heat energy for operation, The invention described in Patent Literature 1 provides only heat energy for operation to a refrigerator (4) by an auxiliary device such as a vapor compression refrigerator or a heater, or uses a refrigerating capacity generated by the vapor compression refrigerator. The second heating element (3) is cooled.
[0010]
Therefore, in the cooling system according to the present invention, the auxiliary devices (20, 30) can be used more efficiently than in the invention described in Patent Document 1, so that the power consumption of the cooling system can be further reduced.
[0011]
In the invention described in claim 2, the auxiliary device (20, 30) assists the refrigerating operation of the refrigerator (4) by cooling a high-temperature portion of the refrigerator (4). .
[0012]
In the invention described in claim 3, the auxiliary device (20, 30) assists the refrigerating operation of the refrigerator (4) by cooling a low-temperature portion of the refrigerator (4). .
[0013]
According to a fourth aspect of the present invention, the auxiliary device has a Peltier element.
[0014]
The invention according to claim 5 is characterized in that the auxiliary device is constituted by a vapor compression refrigerator.
[0015]
In the invention described in claim 6, the refrigerator (4) has an adsorbent that adsorbs the evaporated gas-phase refrigerant and desorbs the adsorbed refrigerant when heated. It is characterized by being an adsorption type refrigerator.
[0016]
According to a seventh aspect of the present invention, the first and second heating elements (2, 3) are electrical devices installed in a mobile phone base station which is a closed space (1). is there.
[0017]
Incidentally, reference numerals in parentheses of the above-mentioned units are examples showing the correspondence with specific units described in the embodiments described later.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
FIG. 1 is a schematic diagram showing a cooling system according to the present embodiment. In the present embodiment, a cooling system for a heating element according to the present invention is applied to cooling of electronic devices in a mobile phone base station 1.
[0019]
In the mobile phone base station 1 having a relatively high heat insulating property and constituting a closed space, a radio-frequency output amplifier, a radio-frequency output control panel, a rectifier, and an electronic device that generate a relatively large amount of heat and have a high temperature , A first heat generating element 2 composed of an electric device, an electric converter, etc., a circuit control panel which needs to be cooled at a lower temperature than the first heat generating element 2, a second heat generating device, a battery, an electronic device, an electric device, an electric converter, etc. A communication device rack on which the body 3 is mounted, and a refrigerator 4 (portion surrounded by a chain line) for cooling the heating elements 2 and 3 are housed.
[0020]
The heating elements 2 and 3 do not operate independently (independently), but operate in conjunction with each other.
[0021]
The first heating element 2 has a higher heat-resistant temperature than the second heating element 3, and the first heating element 2 is circulated with cooling water and cooled by water cooling. On the other hand, the second heating element 3 is forcibly air-cooled by blowing air in the mobile phone base station 1, that is, inside air, because the mounting density of electronic devices or electric devices is high and it is difficult to circulate cooling water. .
[0022]
The refrigerator 4 is an adsorption type refrigerator that operates by absorbing heat from the first heating element 2 and heating the adsorbent by the absorbed heat. Hereinafter, the refrigerator 4 will be described.
[0023]
The adsorber 5 is a container in which a refrigerant is sealed in a state where the inside of the adsorber is kept substantially in a vacuum, and a first heat exchanger (adsorption core) for exchanging heat between the adsorbent and the heat medium is provided in the adsorber 5. 6 and a second heat exchanger (evaporation / condensation core) 7 for exchanging heat between the heat medium and the refrigerant sealed in the adsorber 5 are housed.
[0024]
In the present embodiment, the adsorber 5 includes a plurality of (two) adsorbers 5a and 5b, and the right adsorber 5a (hereinafter, referred to as a first adsorber 5a) and the left adsorber 5b on the paper. (Hereinafter referred to as a second adsorber 5b.) Since they have the same configuration, they will be referred to as the adsorber 5 when they are collectively referred to. The suffix a of the heat exchangers 6 and 7 indicates that it is the heat exchanger in the first adsorber 5a, and the suffix b of the heat exchangers 6 and 7 is the heat exchanger in the second adsorber 5b. It is shown that.
[0025]
Incidentally, the adsorbent adsorbs a refrigerant (in the present embodiment, water) and desorbs the adsorbed refrigerant by being heated. In the present embodiment, a solid adsorbent such as silica gel or zeolite is used. In this embodiment, water mixed with an ethylene glycol-based antifreeze is used as the heat medium.
[0026]
The outdoor unit 8 is an outdoor heat exchanger that is disposed outside the building of the base station 1 and exchanges heat between a heat medium and outdoor air serving as a heat radiating object. The outdoor unit 8 blows a radiator 8a and cooling air. And a fan 8c.
[0027]
The heat collector 2a is a heat exchanger that collects heat generated in the first heating element 2 and exchanges heat with the collected heat and a heat medium. The indoor heat exchanger 3a is a heat medium cooled by the adsorber 5. And a heat exchanger for exchanging heat with the air blown to the second heating element 3. The fan 3b is a blower that blows indoor air for cooling to the indoor heat exchanger 3a.
[0028]
The valves 9a to 9d are rotary valves for switching the heat medium flow, and the pumps 10a to 10c are pump means for circulating the heat medium.
[0029]
The electronic refrigerator 20 is an auxiliary device using the Peltier effect. The electronic refrigerator 20 includes a Peltier element 21, a heating heat exchanger 22 forming a heat radiating section, a cooling heat exchanger 23 forming a heat absorbing section, and the like. The heating heat exchanger 22 heats the heat medium traveling from the first heating element 2 to the adsorber 5, and the cooling heat exchanger 23 cools the heat medium traveling from the outdoor unit 8 to the adsorber 5.
[0030]
That is, the electronic refrigerator 20 absorbs heat from the heat medium traveling from the outdoor unit 8 to the adsorber 5 and applies the absorbed heat to the heat medium traveling from the first heating element 2 to the adsorber 5, whereby the refrigerator 4 While supplementing the heat energy for operating the chiller 4, the chiller 4, that is, the adsorbent in an adsorption step described later is cooled to assist the refrigeration action of the chiller 4.
[0031]
Next, the characteristic operation of the cooling system according to the present embodiment and the effects thereof will be described.
[0032]
1. Basic operation mode of the refrigerator 4 In this mode, the first and second basic operation modes described below are switched every predetermined time. Incidentally, the predetermined time is appropriately selected based on the time required to desorb the refrigerant adsorbed by the adsorbent.
[0033]
In the present embodiment, a heat medium is supplied to the heat collector 2a such that the temperature of the first heating element 2 is equal to or lower than 120 ° C., and the second heating element 3 is heated to the outside air temperature + 20 ° C. (specifically, Is cooled to about 55 ° C. to 60 ° C.) or less, and various specifications are determined so that the refrigerator 4 exhibits a predetermined refrigerating capacity at 70 ° C. or more and 100 ° C. or less.
[0034]
Further, as is apparent from the following description of operation, in order to stably operate the refrigerator 4, the calorific value of the second heating element 3 needs to be always less than or equal to the calorific value of the first heating element 2.
[0035]
1.1 First basic operation mode (see Fig. 2)
In this mode, by circulating the heat medium between the indoor heat exchanger 3a and the second heat exchanger 7b of the second adsorber 5b, the refrigerant in the second adsorber 5b is evaporated to cool the heat medium. Then, by supplying the cooled heat medium to the indoor heat exchanger 3a, the air blown to the second heating element 3 is cooled to cool the second heating element 3 and evaporate in the second adsorber 5b. The gas-phase refrigerant (steam) is adsorbed by the adsorbent in the second adsorber 5b.
[0036]
At this time, the adsorbent generates heat corresponding to the heat of condensation, and if the temperature of the adsorbent increases, the adsorbing ability decreases. Therefore, the heat medium cooled in the outdoor unit 8 is supplied to the second adsorber 5b by the second adsorber 5b. (1) The adsorbent is cooled by supplying it to the heat exchanger 6b.
[0037]
On the other hand, the first heat exchanger 6a of the first adsorber 5a supplies the heat absorbed by the heat medium in the heat collector 2a to the adsorbent of the first adsorber 5a via the heat medium. The adsorbent is heated, the refrigerant adsorbed by the adsorbent is desorbed, and the heat medium cooled by the outdoor unit 8 is supplied to the second heat exchanger 7a of the first adsorber 5a, and the desorption is performed. The vapor-phase refrigerant (steam) is cooled and condensed in the second heat exchanger 7a.
[0038]
Hereinafter, the adsorber 5 in a state where the refrigerant is evaporated to exhibit the refrigerating ability and the evaporated gas-phase refrigerant is adsorbed by the adsorbent is referred to as “adsorber 5 in the adsorption step”. The adsorber 5 that is in a state where the adsorbent is heated to desorb the adsorbed refrigerant while the desorbed refrigerant is being cooled and condensed is referred to as “adsorber 5 in the desorption step”. Call.
[0039]
1.2 Second basic operation mode (see Fig. 3)
In this mode, as opposed to the first basic operation mode, the first adsorber 5a is used as an adsorption step and the second adsorber 5b is used as a desorption step.
[0040]
Specifically, by circulating the heat medium between the indoor heat exchanger 3a and the second heat exchanger 7a of the first adsorber 5a, the refrigerant in the first adsorber 5a is evaporated, and the heat medium is evaporated. By cooling and supplying the cooled heat medium to the indoor heat exchanger 3a, the air blown to the second heating element 3 is cooled to cool the second heating element 3 and evaporate in the first adsorber 5a. The vapor-phase refrigerant (steam) is adsorbed by the adsorbent in the first adsorber 5a.
[0041]
At this time, the heat medium cooled in the outdoor unit 8 is supplied to the first heat exchanger 6a of the first adsorber 5a to cool the adsorbent.
[0042]
On the other hand, in the first heat exchanger 6b of the second adsorber 5b, the heat absorbed by the heat medium in the heat collector 2a is supplied to the adsorbent of the second adsorber 5b through the heat medium. The adsorbent is heated, the refrigerant adsorbed by the adsorbent is desorbed, and the heat medium cooled by the outdoor unit 8 is supplied to the second heat exchanger 7b of the second adsorber 5b to be desorbed. The vapor-phase refrigerant (steam) is cooled and condensed in the second heat exchanger 7b.
[0043]
2. Refrigerator auxiliary mode When the refrigerator 4 is operated in the basic operation mode, for example, when the outside air temperature becomes equal to or higher than a predetermined temperature and the heat radiation capability of the outdoor unit 8 is reduced, or when the first heating element 2 generates. For example, when the amount of waste heat and the temperature become equal to or lower than predetermined values, the electronic refrigerator 20 is operated to absorb heat from the heat medium flowing from the outdoor unit 8 to the adsorber 5, and the absorbed heat is transferred to the first heating element. The heat is supplied to the heat medium flowing from 2 to the adsorber 5.
[0044]
Thus, the adsorbent in the adsorption step is cooled while the heat energy for operating the refrigerator 4 is supplemented, thereby increasing the adsorption capacity of the adsorbent and assisting the refrigerating operation of the refrigerator 4.
[0045]
Next, the operation and effect of the present embodiment will be described.
[0046]
In the present embodiment, the electronic refrigerator 20 serving as an auxiliary device gives the heat absorbed to the refrigerator 4 as heat energy for operation to assist the refrigerator 4 in the refrigerator operation. The described invention provides only heat energy for operation to the refrigerator 4 by an auxiliary device such as a vapor compression refrigerator or a heater, or generates the second heating element 3 by the refrigerating capacity generated by the vapor compression refrigerator. It cools down.
[0047]
Therefore, in the cooling system according to the present embodiment, since the electronic refrigerator 20 as the auxiliary device can be used more efficiently than the invention described in Patent Document 1, the power consumption of the cooling system can be further reduced. it can.
[0048]
Incidentally, in the adsorption type refrigerator, only a maximum of about 70% of the heat input as heat energy for operation can be obtained, but in the present embodiment, the auxiliary device, that is, the electronic refrigerator 20 is used for operation. Therefore, a sufficient cooling capacity can be obtained even when the amount of waste heat and the temperature generated in the first heating element 2 are low.
[0049]
(2nd Embodiment)
In the first embodiment, heat is absorbed (cooled) from the heat medium flowing from the outdoor unit 8 to the adsorber 5, that is, from the high-temperature portion of the refrigerator 4, and the absorbed heat is transferred from the first heating element 2 to the adsorber 5. As shown in FIG. 4, this embodiment absorbs heat (cools) from the heat medium flowing from the refrigerator 4 (adsorber 5) to the second heating element 3, that is, the high temperature portion of the refrigerator 4, as shown in FIG. By applying the absorbed heat to the heat medium traveling from the first heating element 2 to the adsorber 5, the heat absorbed when assisting the refrigerating action of the refrigerator 4 is supplied to the refrigerator 4 as heat energy for operation. Is to give.
[0050]
Therefore, also in the cooling system according to the present embodiment, since the electronic refrigerator 20 as the auxiliary device can be used more efficiently than the invention described in Patent Document 1, the power consumption of the cooling system can be further reduced. Can be.
[0051]
(Third embodiment)
In the above embodiment, the auxiliary device is configured by the electronic refrigerator 20. However, in the present embodiment, as illustrated in FIG. 5, the auxiliary device is configured by a vapor compression refrigerator.
[0052]
Incidentally, the vapor compression refrigerator 30 includes a compressor 31, a high-temperature side heat exchanger 32 for allowing the refrigerant heated by the compressor 31 to cool, and a decompressor 33 for reducing the pressure of the refrigerant flowing out of the high-temperature side heat exchanger 32. , And a low-temperature side heat exchanger 34 for evaporating the depressurized low-pressure refrigerant.
[0053]
In FIG. 5, the heat medium traveling from the first heating element 2 to the adsorber 5 is heated by the high-temperature heat exchanger 32, and the heat medium traveling from the outdoor unit 8 to the adsorber 5 is heated by the low-temperature heat exchanger 34. However, the present embodiment is not limited to this. The high-temperature side heat exchanger 32 heats the heat medium flowing from the first heating element 2 to the adsorber 5 and cools the low-temperature side heat exchanger. At 34, the heat medium from the refrigerator 4 (adsorber 5) to the second heating element 3 may be cooled.
[0054]
In the present embodiment, the refrigerant is chlorofluorocarbon, but the present embodiment is not limited to this, and a natural refrigerant such as carbon dioxide or nitrogen may be used.
[0055]
(Other embodiments)
In the above-described embodiment, the present invention has been described by taking a base station as an example. However, the present invention is not limited to this, and is disposed in a space such as a building, a basement, a factory, a warehouse, a house, a garage, and a vehicle. For cooling a plurality of different types of heating elements (for example, gas turbine engines, gas engines, diesel engines, gasoline engines, fuel cells, electronic devices, electrical devices, electric converters, storage batteries, animals (including humans), etc.). can do.
[0056]
Further, the space is not limited to a closed space, and may be an open space.
[0057]
The heat radiation destination of the cooling system (the heat radiation target, outside the refrigerators 4 and 11) is not limited to the outside air (atmosphere), but may be a river, groundwater, soil, seawater, outer space, or the like.
[0058]
Further, the refrigerant is not limited to water, and may be other refrigerant such as alcohol.
[0059]
In the above-described embodiment, the solid adsorbent is used as the adsorbent (adsorption medium). However, the present invention is not limited to this, and the honeycomb structure impregnated with an absorption liquid such as lithium bromide or ammonia is used. May be used.
[0060]
In the above-described embodiment, the first heating element 2 is water-cooled, and the second heating element 3 is forced air-cooled. However, the present invention is not limited to this.
[0061]
Further, in the above embodiment, the electronic refrigerator 20 or the vapor compression refrigerator 30 is used as the auxiliary device, but the present invention is not limited to this.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a cooling system according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a heat medium flow in a first basic operation mode according to the first embodiment of the present invention.
FIG. 3 is a schematic diagram illustrating a heat medium flow in a second basic operation mode according to the first embodiment of the present invention.
FIG. 4 is a schematic diagram of a cooling system according to a second embodiment of the present invention.
FIG. 5 is a schematic diagram of a cooling system according to a third embodiment of the present invention.
[Explanation of symbols]
1 ... mobile phone base station, 2 ... first heating element, 3 ... second heating element,
4 ... Adsorption refrigerator, 5 ... Adsorber, 6 ... Adsorption core,
7 ... Evaporation / condensation core, 8 ... Outdoor unit,
10a to 10c: pump, 20: electronic refrigerator, 21: Peltier element.

Claims (7)

Heat is absorbed from the first heating element (2) existing in the closed space (1), and the absorbed heat is used as energy for operation and the second heating element (3) existing in the closed space (1). A cooling system comprising a refrigerator (4) for cooling
An auxiliary device (20, 30) for applying heat to the refrigerator (4) and for assisting a refrigerating operation of the refrigerator (4);
The cooling system, characterized in that the auxiliary devices (20, 30) give the absorbed heat to the refrigerator (4) when assisting the refrigerating operation of the refrigerator (4). The cooling system according to claim 1, wherein the auxiliary device (20, 30) assists a refrigerating operation of the refrigerator (4) by cooling a high-temperature portion of the refrigerator (4). The cooling system according to claim 1, wherein the auxiliary device (20, 30) assists a refrigerating operation of the refrigerator (4) by cooling a low-temperature part of the refrigerator (4). 4. The cooling system according to claim 1, wherein the auxiliary device includes a Peltier device. 5. The cooling system according to any one of claims 1 to 3, wherein the auxiliary device is configured by a vapor compression refrigerator. The refrigerator (4) is an adsorption refrigerator configured to have an adsorbent that adsorbs the evaporated gas-phase refrigerant and desorbs the adsorbed refrigerant when heated. A cooling system according to any one of claims 1 to 5, characterized in that: 7. The device according to claim 1, wherein the first and second heating elements are electrical devices installed in a mobile phone base station, which is a closed space. A cooling system according to claim 1.

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