JPH02223773A - Refrigerating device for cooling, which is used in combination both for low-temperature medium and high-temperature medium - Google Patents
Refrigerating device for cooling, which is used in combination both for low-temperature medium and high-temperature mediumInfo
- Publication number
- JPH02223773A JPH02223773A JP4453089A JP4453089A JPH02223773A JP H02223773 A JPH02223773 A JP H02223773A JP 4453089 A JP4453089 A JP 4453089A JP 4453089 A JP4453089 A JP 4453089A JP H02223773 A JPH02223773 A JP H02223773A
- Authority
- JP
- Japan
- Prior art keywords
- low
- compressor
- line
- cooling
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 64
- 238000005057 refrigeration Methods 0.000 claims description 29
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 8
- 239000003507 refrigerant Substances 0.000 abstract description 33
- 230000000694 effects Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 16
- 238000010586 diagram Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 238000007791 dehumidification Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Other Air-Conditioning Systems (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、低温域での冷却は固より高温域での冷却を行
なう効果的にための低温媒体及び高温媒体兼用冷却用冷
凍装置に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a refrigeration system for cooling a low temperature medium and a high temperature medium for effectively performing cooling in a high temperature range rather than solid in a low temperature range. It is.
この種の低温媒体及び高温媒体兼用冷却用冷凍装置とし
ては、例えば、気象条件を再現する環境整備室、自動車
関係の試験室、植物の実験室等の如く、地球上での色々
の気象条件を再現するのに使用されている。そして、こ
の環境整備室は、広域な制御範囲を持ち、例えば−４０
℃乃至＋５０°Ｃという広い範囲で温度条件を再現する
と共に、湿度制限も＋５０℃のように高温になると、９
０％と言うように高い条件を再現することがある。This type of refrigeration equipment that can be used as both a low-temperature medium and a high-temperature medium is suitable for use in various weather conditions on earth, such as environmental maintenance rooms that reproduce weather conditions, automobile-related test rooms, plant laboratories, etc. used to reproduce. This environmental maintenance room has a wide control range, for example -40
In addition to reproducing temperature conditions in a wide range from ℃ to +50℃, the humidity limit also increases to 9
High conditions such as 0% may be reproduced.
従来、このような装置に使用されている低温媒体及び高
温媒体兼用冷却用冷凍装置としては、直接膨張冷凍機が
知られている。Conventionally, a direct expansion refrigerator is known as a refrigeration device for cooling both a low-temperature medium and a high-temperature medium, which is used in such devices.
これを第５図に基づいて説明する。This will be explained based on FIG.
この直接膨張冷凍機を用いた冷凍装置は、圧縮機（冷凍
機）１と凝縮器２と膨張弁３と低圧レシーバ４と液ポン
プ５と蒸発器６とを備え、圧縮機１と凝縮器２とを高圧
ガスライン７で連結し、凝縮機２と低圧レシーバ４とを
膨張弁３を介装して高圧液ライン８で連結し、低圧レシ
ーバ４と蒸発器６とを液ポンプ５を介装して低圧液ライ
ン９で連結し、蒸発器６と低圧レシーバ４とを第一低圧
ガスライン１０で連結し、低圧レシーバ４と圧縮機１と
を第二低圧ガスライン１１とを連結することによって冷
凍サイクルを形成している。A refrigeration system using this direct expansion refrigerator includes a compressor (refrigerator) 1, a condenser 2, an expansion valve 3, a low pressure receiver 4, a liquid pump 5, and an evaporator 6. are connected by a high-pressure gas line 7, the condenser 2 and low-pressure receiver 4 are connected by a high-pressure liquid line 8 via an expansion valve 3, and the low-pressure receiver 4 and evaporator 6 are connected by a liquid pump 5. By connecting the evaporator 6 and the low pressure receiver 4 with the first low pressure gas line 10, and connecting the low pressure receiver 4 and the compressor 1 with the second low pressure gas line 11. It forms a refrigeration cycle.
先ず、圧縮機１で圧縮し、圧縮機１で圧縮した高圧ガス
を高圧ガスライン７を介して凝縮器２へ送り、凝縮機２
で凝縮して液化する。これを高圧液ライン８を介して低
圧レシーバ４へ送る。この低圧レシーバ４の前に設けた
膨張弁３によって高圧液を膨張させて冷たい液にすると
同時に一部気化させる。低圧レシーバ４に送られたその
冷たい液は、低圧液ライン９を介して液ポンプ５によっ
て蒸発器６に送られる。蒸発器６を出たガスは、第一低
圧ガスライン１０を介して低圧レシーバ４に戻り、冷た
いガスの一部が第二低圧ガスライン１１を介して圧縮機
ｌに送られ、上述した如き回路を循環する。First, the high pressure gas compressed by the compressor 1 is sent to the condenser 2 via the high pressure gas line 7.
It condenses and liquefies. This is sent to the low pressure receiver 4 via the high pressure liquid line 8. An expansion valve 3 provided in front of the low-pressure receiver 4 expands the high-pressure liquid to make it a cold liquid and at the same time partially vaporizes it. The cold liquid sent to the low pressure receiver 4 is sent to the evaporator 6 by the liquid pump 5 via the low pressure liquid line 9. The gas leaving the evaporator 6 is returned to the low pressure receiver 4 via a first low pressure gas line 10, and a portion of the cold gas is sent via a second low pressure gas line 11 to the compressor l, which is connected to the circuit as described above. cycle.
これによって蒸発器６を通過する被冷却媒体を冷却する
ことができる。Thereby, the medium to be cooled passing through the evaporator 6 can be cooled.
然し乍ら、斯かる従来の冷凍装置では、次に示す如き不
具合がある。However, such conventional refrigeration equipment has the following problems.
従来の冷凍サイクルに於ては、被冷却側熱媒体温度が、
例えば＋５０゛Ｃの時、冷却側熱媒体温度を低温域と同
じように、被冷却側熱媒体温度より５乃至６°Ｃ低く、
即ち、４５°Ｃ前後にするのが適切である。然し、凝縮
圧を異常に高くするか、或いはポンプを設けて、加圧し
蒸発器に給液することが必要になる。従って、一般には
、冷却側熱媒体温度を２０°Ｃ程度までしか上昇できな
いため、蒸発器に過剰な減湿を伴うこととなる。In a conventional refrigeration cycle, the temperature of the heat medium on the cooled side is
For example, when the temperature is +50°C, the cooling side heat medium temperature is 5 to 6°C lower than the cooled side heat medium temperature, as in the low temperature range.
That is, it is appropriate to set the temperature at around 45°C. However, it is necessary to make the condensing pressure abnormally high or to provide a pump to pressurize and supply liquid to the evaporator. Therefore, in general, the temperature of the cooling side heat medium can only be increased to about 20° C., resulting in excessive dehumidification in the evaporator.
その結果、ランニングコストが嵩むだけでなく、顕熱冷
却が不足し、冷凍機が大きくなる場合がある。又、冷却
水（高温排熱側）温度が冷却温度（低温吸熱側）よりも
低い運転基で、冷凍サイクルを行なう不合理性がある。As a result, not only running costs increase, but sensible heat cooling may become insufficient and the refrigerator may become larger. Furthermore, it is unreasonable to perform the refrigeration cycle in an operating mode where the temperature of the cooling water (on the high-temperature exhaust heat side) is lower than the cooling temperature (on the low-temperature endothermic side).
従来、斯かる不具合を解消するものとして、冷媒自然循
環が知られている。Conventionally, natural refrigerant circulation has been known as a solution to such problems.
冷媒自然循環によれば、例えば＋５０℃の時でも、冷房
しなければならない場合、外気が３２°Ｃになっても、
冷凍機を回さなくても冷房できる。According to the natural circulation of refrigerant, if you have to cool the room even when the temperature is +50°C, even if the outside temperature is 32°C,
You can cool the air conditioner without turning the refrigerator.
斯くして、冷媒自然循環により、冷却水温度が冷却温度
よりも低い運転基で冷凍サイクルを行なう不合理性が解
決されるばかりでなく、冷凍サイクルによらず運転され
、且つ、冷却熱媒体温度は被冷却熱媒体温度との中間の
温度となり、冷凍サイクルの運転の場合のように被冷却
熱媒体温度と冷却熱媒体温度に大きな差が生じない。従
って、蒸発器に於ても過剰な減湿を伴うことなく運転す
ることができる。In this way, the natural circulation of refrigerant not only solves the unreasonableness of operating the refrigeration cycle in an operating mode where the cooling water temperature is lower than the cooling temperature, but also allows the refrigeration cycle to be operated without depending on the refrigeration cycle and with the cooling heat medium temperature being lower than the cooling temperature. is a temperature intermediate between the temperature of the heat medium to be cooled and the temperature of the heat medium to be cooled, and there is no large difference between the temperature of the heat medium to be cooled and the temperature of the heat medium to be cooled, unlike in the case of operation of a refrigeration cycle. Therefore, the evaporator can also be operated without excessive dehumidification.
然し、冷媒自然循環では、気象条件によって能力が制限
を受けるので、例えば上述した環境制御室の如く、設定
温度が激しく変動するものにあっては、外気とのバラン
スで運転できなくなるとか、運転できても能力が出ない
とか、諸々の条件があって現実的には実施されていない
。However, with natural refrigerant circulation, the capacity is limited by weather conditions, so for example, in the environment control room mentioned above, where the set temperature fluctuates drastically, it may become impossible to operate due to the balance with the outside air. However, it has not been implemented realistically due to various conditions such as lack of ability.
本発明は斯かる従来の不具合を解決するために為された
もので、その目的は、通常の直接膨張冷凍機による冷凍
サイクルに冷媒自然循環に近似した圧縮機を用いない冷
凍サイクルを組み込み、冷媒自然循環に近似した圧縮機
を用いない冷房運転を行ない、この冷房運転による冷却
機能が充分に達成されない時に、切換操作によって圧縮
機を用いて低温場を形成し、連続的に冷媒自然循環に近
似した圧縮機を用いない冷房運転が達成できるように工
夫し、以って低温域での冷却は固より高温域の冷却を合
理的に且つ経済的に行なうことの可能な低温媒体及び高
温媒体兼用冷却用冷凍装置を提供することにある。The present invention was made to solve such conventional problems, and its purpose is to incorporate a refrigeration cycle that does not use a compressor that approximates natural refrigerant circulation into a refrigeration cycle using a normal direct expansion refrigerator, and to Cooling operation is performed without using a compressor that approximates natural circulation, and when the cooling function is not sufficiently achieved by this cooling operation, a low-temperature field is created using the compressor by switching operations to continuously approximate natural circulation of refrigerant. The system has been devised to achieve cooling operation without the use of a compressor, and is capable of being used as both a low-temperature medium and a high-temperature medium, allowing cooling in low-temperature ranges to be solid and cooling in high-temperature ranges to be performed rationally and economically. An object of the present invention is to provide a cooling refrigeration device.
〔課題を解決するための手段］
本発明に係る低温媒体及び高温媒体兼用冷却用冷凍装置
は、圧縮機と凝縮器と膨張弁と低圧レシーバと液ポンプ
と蒸発器とを備え、圧縮機と凝縮器とを高圧ガスライン
で連結し、凝縮器と低圧レシーバとを膨張弁を介装して
高圧液ラインで連結し、低圧レシーバと蒸発器とを液ポ
ンプを介装して低圧液ラインで連結し、蒸発器と低圧レ
シーバとを第一低圧ガスラインで連結し、低圧レシーバ
と圧縮機とを第二低圧ガスラインとを連結することによ
って冷凍サイクルを形成して成る冷凍装置に於て、高圧
ガスラインと第一低圧ガスラインとを第一切換弁を介装
した第一バイパスラインで連結し、高圧液ラインと第二
低圧ガスラインとを第二切換弁と第二膨張弁と間接冷却
器とを介装した第二バイパスラインで連結し、第一バイ
パスラインと低圧レシーバとを第三切換弁を介装した第
三バイパスラインを連結すると共に、この第三バイパス
ラインを上記第二バイパスラインに設けた間接冷却器中
を貫通させて、第二バイパスラインと熱的に連結し、第
一低圧ガスラインに於ける第一バイパスラインとの連結
部よりも低圧レシーバ側に第四切換弁を設け、第二低圧
ガスラインに蒸発圧力調整弁を設け、且つ、高圧液ライ
ンに於ける膨張弁と第二バイパスラインとの連結部との
間に第五切換弁を設けたものである。[Means for Solving the Problems] A refrigeration system for cooling both low-temperature and high-temperature media according to the present invention includes a compressor, a condenser, an expansion valve, a low-pressure receiver, a liquid pump, and an evaporator. The condenser and low-pressure receiver are connected via a high-pressure liquid line via an expansion valve, and the low-pressure receiver and evaporator are connected via a low-pressure liquid line via a liquid pump. In a refrigeration system in which a refrigeration cycle is formed by connecting an evaporator and a low-pressure receiver with a first low-pressure gas line, and connecting a low-pressure receiver and a compressor with a second low-pressure gas line, the high-pressure The gas line and the first low-pressure gas line are connected by a first bypass line equipped with a first switching valve, and the high-pressure liquid line and the second low-pressure gas line are connected by a second switching valve, a second expansion valve, and an indirect cooler. The first bypass line and the low pressure receiver are connected by a second bypass line with a third switching valve interposed therebetween, and the third bypass line is connected to the second bypass line with the third bypass line interposed with the third switching valve. A fourth switching valve is connected thermally to the second bypass line by passing through the indirect cooler provided in the first low pressure gas line, and is located closer to the low pressure receiver than the connection part with the first bypass line in the first low pressure gas line. An evaporation pressure regulating valve is provided in the second low-pressure gas line, and a fifth switching valve is provided between the connection portion between the expansion valve and the second bypass line in the high-pressure liquid line.
本発明に於ては、冷却水温度が被冷却媒体温度より充分
低い場合には、圧縮機を停止し、第一切換弁を開き、第
二切換弁、第三切換弁及び蒸発圧力調整弁を閉じ、且つ
、膨張弁を開き、冷媒を冷媒自然循環により、凝縮器→
低圧レシーバ→液ポンプ→蒸発器→第一バイパスライン
→凝縮器という経路を循環させる。In the present invention, when the cooling water temperature is sufficiently lower than the cooled medium temperature, the compressor is stopped, the first switching valve is opened, and the second switching valve, third switching valve, and evaporation pressure adjustment valve are closed. Close and open the expansion valve to allow the refrigerant to flow through the condenser →
Circulate through the following path: low pressure receiver → liquid pump → evaporator → first bypass line → condenser.
上述の冷媒自然循環に近似した圧縮機を用いない運転で
は、冷却能力が不足する場合には、第一切換弁を閉じる
と共に第五切換弁を閉じ、第二切換弁を開き、且つ、圧
縮機を駆動して、冷媒を圧縮機→凝縮器→第二膨張弁→
間接冷却器→圧縮機という経路を循環させる。これと並
行して、第三バイパスラインの第四切換弁を開き、冷媒
を低圧レシーバ→液ポンプ→蒸発器→間接冷却器→低圧
レシーバという経路を循環させる。これによって、蒸発
器側の経路を循環する冷媒は、間接冷却器に於て、圧縮
機側の冷たい冷媒によって強制的に冷却され、冷媒自然
循環によって蒸発器を通過する被冷却媒体を冷却できる
。従って、例えば５０°Ｃの高温熱媒体の冷却に於ても
、蒸発器側は最適な温度場で冷却できるだけでなく、圧
縮機側も冷却熱媒体温度を２０’Ｃ以下で運転すること
が可能となる。In operation without a compressor that approximates the natural refrigerant circulation described above, if the cooling capacity is insufficient, the first switching valve is closed, the fifth switching valve is closed, the second switching valve is opened, and the compressor is closed. Drive the refrigerant to the compressor → condenser → second expansion valve →
Circulate through the indirect cooler → compressor route. In parallel with this, the fourth switching valve of the third bypass line is opened, and the refrigerant is circulated through the path of low pressure receiver -> liquid pump -> evaporator -> indirect cooler -> low pressure receiver. As a result, the refrigerant circulating in the path on the evaporator side is forcibly cooled by the cold refrigerant on the compressor side in the indirect cooler, and the medium to be cooled passing through the evaporator can be cooled by natural refrigerant circulation. Therefore, even when cooling a high temperature heat medium of 50°C, for example, not only can the evaporator side be cooled at the optimum temperature field, but the compressor side can also be operated at a cooling heat medium temperature of 20°C or less. becomes.
又、第一切換弁、第二切換弁第三切換弁を閉じると共に
、第四切換弁を開き、圧縮機を駆動すると、冷媒が圧縮
機→凝縮器→膨張弁→低圧しシーバ→液ポンプ→蒸発器
→低圧しシーバ→圧縮機という経路を循環する。Also, when the first switching valve, the second switching valve, and the third switching valve are closed, and the fourth switching valve is opened to drive the compressor, the refrigerant flows through the compressor → condenser → expansion valve → low pressure sheaver → liquid pump → It circulates through the evaporator → low-pressure sheaver → compressor.
［実施例］ 以下、本発明の実施例を図面に基づいて説明する。[Example] Embodiments of the present invention will be described below based on the drawings.
第１図乃至第４図は本発明の一実施例に係る低温媒体及
び高温媒体兼用冷却用冷凍装置を示すもので、２０は圧
縮機を表す。1 to 4 show a refrigeration system for cooling both low-temperature medium and high-temperature medium according to an embodiment of the present invention, and 20 represents a compressor.
この圧縮機２０は、高圧ガスライン２１を介して凝縮器
２２と連結している。この凝縮器２２は、高圧液ライン
２３を介して低圧レシーバ２５と連結している。この高
圧液ライン２３には、第五切換弁４１と膨張弁２４とが
介装されている。この低圧レシーバ２５の液側が、低圧
液ライン２７を介して蒸発器２８と連結している。この
低圧液うイン２７には、液ポンプ２６が介装されている
。This compressor 20 is connected to a condenser 22 via a high pressure gas line 21. This condenser 22 is connected to a low pressure receiver 25 via a high pressure liquid line 23. This high pressure liquid line 23 is provided with a fifth switching valve 41 and an expansion valve 24 . The liquid side of this low pressure receiver 25 is connected to an evaporator 28 via a low pressure liquid line 27. A liquid pump 26 is interposed in this low-pressure liquid container 27 .
蒸発器２８の出口側と低圧レシーバ２５のガス側とは、
第一低圧ガスライン２９を介して連結している。この第
一低圧ガスライン２９には、第四切換弁３９が介装され
ている。又、低圧レシーバ２５は、第二低圧ガスライン
３０を介して圧縮機２０と連結している。この第二低圧
ガスライン３０には、蒸発圧力調整弁４０が介装されて
いる。The outlet side of the evaporator 28 and the gas side of the low pressure receiver 25 are
They are connected via a first low pressure gas line 29. A fourth switching valve 39 is interposed in the first low pressure gas line 29 . Further, the low pressure receiver 25 is connected to the compressor 20 via a second low pressure gas line 30. This second low pressure gas line 30 is provided with an evaporation pressure regulating valve 40 .
斯くして、圧縮機２０→凝縮器２２→膨張弁２４→低圧
レシ一バ２５→液ポンプ２６→蒸発器２８→低圧レシー
バ２５→圧縮機２０という循環回路が形成されることと
なる。In this way, a circulation circuit of compressor 20→condenser 22→expansion valve 24→low pressure receiver 25→liquid pump 26→evaporator 28→low pressure receiver 25→compressor 20 is formed.
又、第一低圧ガスライン２９と高圧ガスライン２１とが
、第一バイパスライン３１によって連結されている。こ
の第一バイパスライン３１には、第一切換弁３２が取り
付けられている。Further, the first low pressure gas line 29 and the high pressure gas line 21 are connected by a first bypass line 31. A first switching valve 32 is attached to this first bypass line 31.
更に、高圧液ライン２３と第二低圧ガスライン３０とが
第二バイパスライン３３によって連結されている。この
第二バイパスライン３３には、第二切換弁３４．第二膨
張弁３５及び間接冷却器３６が介装されている。そして
、この第二バイパスライン３３と高圧液ライン２３との
連結部は、高圧液ライン２３に於ける膨張弁２４よりも
凝縮器２２側の位置となっている。Further, the high pressure liquid line 23 and the second low pressure gas line 30 are connected by a second bypass line 33. This second bypass line 33 has a second switching valve 34. A second expansion valve 35 and an indirect cooler 36 are interposed. The connection portion between the second bypass line 33 and the high-pressure liquid line 23 is located closer to the condenser 22 than the expansion valve 24 in the high-pressure liquid line 23 .
更に又、第一バイパスライン３１と低圧レシーバ２５と
が、第三バイパスライン３７によって連結されている。Furthermore, the first bypass line 31 and the low pressure receiver 25 are connected by a third bypass line 37.
この第三バイパスライン３７は、第二バイパスライン３
３に設けた間接冷却器３６中を貫通し、この間接冷却器
３６によって冷却こされるようになっている。又、この
第三バイパスライン３７には、間接冷却器３６よりも第
一バイパスライン３１側に第三切換弁３８が介装されて
いる。This third bypass line 37 is the second bypass line 3
It penetrates through an indirect cooler 36 provided at 3, and is cooled by this indirect cooler 36. Further, a third switching valve 38 is interposed in the third bypass line 37 on the side closer to the first bypass line 31 than the indirect cooler 36 .
次に、以上の如く構成された本実施例の作用を説明する
。Next, the operation of this embodiment configured as described above will be explained.
先ず、凝縮器２２を冷却する冷却水の温度が、蒸発器２
８を通過する被冷却媒体の温度よりも高い場合、例えば
冷却水の温度が３２°Ｃ１被冷却媒体（空気）の温度が
１０°Ｃの場合には、第２図に示す如き通常運転とする
ことができる。First, the temperature of the cooling water that cools the condenser 22 is lower than that of the evaporator 2.
If the temperature of the cooling water is higher than the temperature of the cooled medium passing through 8, for example, the temperature of the cooling water is 32°C1, and the temperature of the cooled medium (air) is 10°C, normal operation is performed as shown in Figure 2. be able to.
この通常運転をするためには、第一バイパスライン３１
の第一切換弁３２と、第二バイパスライン３３の第二切
換弁３４と、第三バイパスライン３７の第三切換弁３８
とを閉じることによって、太線で示す循環経路を形成す
る。In order to perform this normal operation, the first bypass line 31
, the second switching valve 34 of the second bypass line 33, and the third switching valve 38 of the third bypass line 37.
By closing these, a circulation path shown by the thick line is formed.
この通常運転では、圧縮機２０で圧縮し、圧縮機２０で
圧縮した高圧ガスを高圧ガスライン２１を介して凝縮器
２２へ送り、凝縮器２２で凝縮して液化する。これを高
圧液ライン２３を介して低圧レシーバ２５へ送る。この
低圧レシーバ２５の前に設けた膨張弁２４によって高圧
液を膨張させて冷たい液にすると同時に一部気化させる
。低圧レシーバ２５に送られたその冷たい液は、低圧液
ライン２７を介して液ポンプ２６によって蒸発器２８に
送られる。この蒸発器２日に於て、被冷却媒体（空気）
と熱交換してガス化し、そのガスは蒸発器２８から第一
低圧ガスライン２°９を介して低圧レシーバ２５に戻り
、冷たいガスの一部が第二低圧ガスライン３０を介して
圧縮機２０に送られ、上述した如き回路を循環する。In this normal operation, the compressor 20 compresses the high-pressure gas, and the compressed high-pressure gas is sent to the condenser 22 via the high-pressure gas line 21, where it is condensed and liquefied. This is sent to the low pressure receiver 25 via the high pressure liquid line 23. An expansion valve 24 provided in front of the low pressure receiver 25 expands the high pressure liquid to make it a cold liquid and at the same time partially vaporizes it. The cold liquid sent to low pressure receiver 25 is sent to evaporator 28 by liquid pump 26 via low pressure liquid line 27. In this evaporator, the medium to be cooled (air)
The gas is returned from the evaporator 28 to the low pressure receiver 25 via the first low pressure gas line 2°9, and a portion of the cold gas is transferred to the compressor 20 via the second low pressure gas line 30. and circulates through the circuit as described above.
そして、例えば、冷却水温度が２０°Ｃで被冷媒体温度
が５０°Ｃの場合とか、冷却水温度が５°Ｃで被冷媒体
温度が２０℃の場合等の如く、冷却水温度が被冷却媒体
温度よりも充分に低くなった場合には、第３図に示す如
き冷媒自然循環に近似した圧縮機を用いない運転とする
ことができる。For example, when the cooling water temperature is 20°C and the cooled medium temperature is 50°C, or when the cooling water temperature is 5°C and the cooled medium temperature is 20°C, the cooling water temperature changes. When the temperature is sufficiently lower than the refrigerant temperature, it is possible to operate without using a compressor, which approximates the natural circulation of refrigerant as shown in FIG.
この運転状態にするためには、圧縮機２０を停止し、第
一低圧ガスライン２９の第四切換弁２８と、第二低圧ガ
スライン３０の蒸発圧力調整弁４０と、第二バイパスラ
イン３３の第三切換弁３４と第三バイパスライン３７の
切換弁３８とを閉じることによって、太線で示す循環経
路を形成することができる。To achieve this operating state, the compressor 20 is stopped, and the fourth switching valve 28 of the first low pressure gas line 29, the evaporation pressure regulating valve 40 of the second low pressure gas line 30, and the second bypass line 33 are closed. By closing the third switching valve 34 and the switching valve 38 of the third bypass line 37, a circulation path shown by a bold line can be formed.
この循環経路は、所謂冷媒自然循環に近似した圧縮機を
用いない冷房運転であって、凝縮器２２で凝縮して液化
した冷媒は、高圧液ライン２３を介して低圧レシーバ２
５へ送られる。この際、高圧液ライン２３に設けた膨張
弁２４は、膨張弁としての機能を持たず、通過する高圧
液の流通に支障を与えないようになっている。そして、
低圧しシーバ２５に送られたその冷たい液は、低圧液ラ
イン２７を介して液ポンプ２６によって蒸発器２８に送
られる。この蒸発器２８に於て、被冷却媒体（空気）と
熱交換してガス化し、そのガスは蒸発器２８から第一低
圧ガスライン２９の途中から、第一バイパスライン３１
へ流入し、凝縮器２２へ送られる。そして、再び上述し
た如き回路を循環する。This circulation route is a cooling operation that does not use a compressor and is similar to so-called natural refrigerant circulation, and the refrigerant condensed and liquefied in the condenser 22 is sent to the low-pressure receiver 2 via the high-pressure liquid line 23.
Sent to 5. At this time, the expansion valve 24 provided in the high-pressure liquid line 23 does not have the function of an expansion valve, so that it does not interfere with the flow of the high-pressure liquid passing therethrough. and,
The cold liquid under pressure and sent to the sear 25 is sent to the evaporator 28 by the liquid pump 26 via the low pressure liquid line 27. In this evaporator 28, it is gasified by exchanging heat with the medium to be cooled (air), and the gas is passed from the evaporator 28 to the middle of the first low pressure gas line 29 to the first bypass line 31.
and is sent to the condenser 22. Then, the circuit as described above is circulated again.
そして、例えば、冷却水温度が３０℃で被冷媒体温度が
３０°Ｃというように両者の差が小さくなるか、或いは
無くなった場合には、第４図に示す如く、圧縮機２０を
用いて低温場を形成し、冷却機能を増加させる。For example, when the difference between the two becomes small or disappears, such as when the cooling water temperature is 30°C and the temperature of the cooled medium is 30°C, the compressor 20 is used as shown in FIG. Forms a low temperature field and increases cooling function.
この運転状態にするためには、第一バイパスライン３１
の第一切換弁３２と、高圧液ライン２３の第五切換弁４
１と、第一低圧ガスライン２９の第四切換弁２８と、第
二低圧ガスライン３０の蒸発圧力調整弁４０とを閉じ、
第二バイパスライン３３の第二切換弁３４と、第三バイ
パスライン３７の第三切換弁３８とを開き、且つ、圧縮
機２０を駆動することによって、太線で示す二つの冷却
循環経路ＡとＢとを形成することができる。In order to achieve this operating state, the first bypass line 31
the first switching valve 32 and the fifth switching valve 4 of the high pressure liquid line 23.
1, the fourth switching valve 28 of the first low pressure gas line 29, and the evaporation pressure adjustment valve 40 of the second low pressure gas line 30 are closed,
By opening the second switching valve 34 of the second bypass line 33 and the third switching valve 38 of the third bypass line 37 and driving the compressor 20, the two cooling circulation paths A and B shown in bold lines are opened. can be formed.
この冷却循環経路Ａは、所謂冷媒自然循環に近似した圧
縮機を用いない冷房経路であり、又、冷却循環経路Ｂは
、直接膨張冷却循環回路に相当する。The cooling circulation path A is a cooling path that does not use a compressor and is similar to so-called natural refrigerant circulation, and the cooling circulation path B corresponds to a direct expansion cooling circulation circuit.
先ず、冷却循環経路Ｂでは、圧縮機２０で圧縮し、圧縮
機２０で圧縮した高圧ガスを高圧ガスライン２１を介し
て凝縮器２２へ送り、凝縮器２２で凝縮して液化する。First, in the cooling circulation path B, the high-pressure gas is compressed by the compressor 20 and sent to the condenser 22 via the high-pressure gas line 21, where it is condensed and liquefied.
これを高圧液ライン２３を介して間接冷却器３６へ送る
。この間接冷却器３６の前に設けた第二膨張弁３５によ
って高圧液を膨張させて冷たい液にする。その後、圧縮
機２０に戻るという経路を循環することとなる。This is sent to the indirect cooler 36 via the high pressure liquid line 23. A second expansion valve 35 provided in front of the indirect cooler 36 expands the high-pressure liquid into a cold liquid. Thereafter, the air circulates through the route returning to the compressor 20.
一方、冷却循環経路Ａでは、ガス化した冷媒が間接冷却
器３６を通過することによって凝縮して液化し、第三バ
イパスライン３７を介して低圧レシーバ２５へ送られる
。そして、低圧レシーバ２５に送られたその冷たい液は
、低圧液ライン２７を介して液ポンプ２６によって蒸発
器２８に送られる。この蒸発器２８に於て、被冷却媒体
（空気）と熱交換してガス化し、そのガスは蒸発器２８
から第一低圧ガスライン２９の途中から、第一バイパス
ライン３１へ流入し、再び間接冷却器３６を通過し、再
び上述した如き回路を循環する。On the other hand, in the cooling circulation path A, the gasified refrigerant passes through the indirect cooler 36, condenses and liquefies, and is sent to the low pressure receiver 25 via the third bypass line 37. The cold liquid sent to the low pressure receiver 25 is then sent to the evaporator 28 by the liquid pump 26 via the low pressure liquid line 27. In this evaporator 28, heat is exchanged with the medium to be cooled (air) and gasified, and the gas is transferred to the evaporator 28.
The gas flows into the first bypass line 31 from the middle of the first low-pressure gas line 29, passes through the indirect cooler 36 again, and circulates through the circuit as described above again.
以上述べた如く、本実施例によれば、切換弁の切換によ
って、冷却水温度が被冷却媒体温度より高い場合には、
通常の冷凍サイクルによる運転を行ない、冷却水温度が
被冷却媒体温度より充分に低くなった場合には、冷媒自
然循環に近似Ｌ７た圧縮機を用いない冷房運転を行ない
、且つ、冷却水温度と被冷却媒体温度との差が無い場合
又は小さい場合には、圧縮器を駆動して強制的に低温場
を形成することによって冷媒自然循環に近似した圧縮機
を用いない冷房運転を続行できる。従って、特に、例え
ば、４０℃乃至５０°Ｃという高温で且つ冷却が必要な
環境制御室に於ては、連続的に冷媒自然Ｗｉ環に近似し
た圧縮機を用いない冷却を高温域で運転することが可能
となり、蒸発器の冷却熱媒体温度を従来の冷凍サイクル
運転のように２０°Ｃ前後に低くすることなく、被冷却
熱媒体温度より５乃至７°Ｃ低い温度で過剰な減湿を伴
わず効果的に冷却することができ、且つ、圧縮機側も２
０゛Ｃ以下の低圧場で無理なく運転することが可能とな
る。而も、冷却水が充分に低くなり、圧縮機を運転する
必要がなくなった場合には、速やかに圧縮機を停止する
ことができる。As described above, according to this embodiment, when the cooling water temperature is higher than the cooled medium temperature by switching the switching valve,
When operation is performed using a normal refrigeration cycle and the cooling water temperature becomes sufficiently lower than the cooled medium temperature, cooling operation is performed without using a compressor, which approximates natural refrigerant circulation L7, and the cooling water temperature and If there is no difference in temperature from the medium to be cooled or the difference is small, the compressor is driven to forcibly form a low-temperature field, thereby allowing continued cooling operation without using a compressor that approximates natural refrigerant circulation. Therefore, in particular, for example, in an environmental control room where the temperature is as high as 40°C to 50°C and cooling is required, cooling without using a compressor that approximates a natural refrigerant cycle is operated continuously in the high temperature range. This makes it possible to prevent excessive dehumidification at a temperature 5 to 7°C lower than the temperature of the heat medium to be cooled, without lowering the temperature of the cooling heat medium in the evaporator to around 20°C as in conventional refrigeration cycle operation. It can be effectively cooled without
It becomes possible to operate without difficulty in a low pressure field below 0°C. Moreover, when the cooling water level becomes sufficiently low and there is no need to operate the compressor, the compressor can be stopped immediately.
（発明の効果〕
以上述べた如く、本発明は、圧縮機と凝縮器と膨張弁と
低圧レシーバと液ポンプと蒸発器とを備え、圧縮機と凝
縮器とを高圧ガスラインで連結し、凝縮器と低圧レシー
バとを膨張弁を介装して高圧液ラインで連結し、低圧レ
シーバと蒸発器とを液ポンプを介装して低圧液ラインで
連結し、蒸発器と低圧レシーバとを第一低圧ガスライン
で連結し、低圧レシーバと圧縮機とを第二低圧ガスライ
ンとを連結することによって冷凍サイクルを形成して成
る冷凍装置に於て、高圧ガスラインと第一低圧ガスライ
ンとを第一切換弁を介装した第一バイパスラインで連結
し、高圧液ラインと第二低圧ガスラインとを第二切換弁
と第二膨張弁と間接冷却器とを介装した第二バイパスラ
インで連結し、第一バイパスラインと低圧レシーバとを
第三切換弁を介装した第三バイパスラインを連結すると
共に、この第三バイパスラインを上記第二バイパスライ
ンに設けた間接冷却器中を貫通させて、第二バイパスラ
インと熱的に連結し、第一低圧ガスラインに於ける第一
バイパスラインとの連結部よりも低圧レシーバ側に第四
切換弁を設け、第二低圧ガスラインに蒸発圧力調整弁を
設け、且つ、高圧液ラインに於ける膨張弁と第二バイパ
スラインとの連結部との間に第五切換弁を設けたもので
あるから、例えば、冷却水温度が年間５乃至３２℃程度
になり、被冷却媒体温度が冷却水温度よりも充分高い場
合が多い環境制御室に於ては、圧縮機を停止して冷媒自
然循環に近似した圧縮機を用いない冷房によって冷却す
ることが可能となり、従来の冷凍機による冷却システム
に比してランニングコストが非常に安価となる。又、被
冷却媒体の温度が冷却水の温度よりも高い場で圧縮機を
運転するという不合理性を無くすことが可能となるため
、システムの優位性が高い。更に、切換弁の切換によっ
て三種類のモードを選ぶことができるので、任意の運転
モードに円滑に移行することができる。(Effects of the Invention) As described above, the present invention includes a compressor, a condenser, an expansion valve, a low-pressure receiver, a liquid pump, and an evaporator, and connects the compressor and condenser with a high-pressure gas line. The evaporator and the low pressure receiver are connected by a high pressure liquid line through an expansion valve, the low pressure receiver and the evaporator are connected by a low pressure liquid line through a liquid pump, and the evaporator and the low pressure receiver are connected by a high pressure liquid line through an expansion valve. In a refrigeration system in which a refrigeration cycle is formed by connecting a low-pressure receiver and a compressor to a second low-pressure gas line, the high-pressure gas line and the first low-pressure gas line are connected to each other by a second low-pressure gas line. All are connected by a first bypass line equipped with a switching valve, and the high-pressure liquid line and second low-pressure gas line are connected by a second bypass line equipped with a second switching valve, a second expansion valve, and an indirect cooler. The first bypass line and the low pressure receiver are connected to a third bypass line equipped with a third switching valve, and the third bypass line is passed through an indirect cooler provided in the second bypass line. , thermally connected to the second bypass line, and provided with a fourth switching valve closer to the low-pressure receiver than the connecting part with the first bypass line in the first low-pressure gas line, and adjusting the evaporation pressure in the second low-pressure gas line. A valve is provided, and a fifth switching valve is provided between the expansion valve in the high-pressure liquid line and the connection part with the second bypass line. In environmental control rooms where the temperature of the cooled medium is often sufficiently higher than the cooling water temperature, it is possible to stop the compressor and perform cooling without using a compressor, which approximates natural refrigerant circulation. The running cost is much lower than that of a conventional cooling system using a refrigerator.It also eliminates the unreasonableness of operating the compressor when the temperature of the medium to be cooled is higher than the temperature of the cooling water. The system has a high advantage because it can be eliminated.Furthermore, three types of modes can be selected by switching the switching valve, so it is possible to smoothly shift to any operating mode.
第１図は本発明の一実施例に係る低温媒体及び高温媒体
兼用冷却用冷凍装置を示す説明図である。
第２図は通常の冷凍サイクルで運転する状態を示す説明
図である。
第３図は冷媒自然循環に近似した圧縮機を用いない冷房
運転状態を示す説明図である。
第４図は強制的に冷媒自然循環に近似した圧縮機を用い
ない冷房運転状態を示す説明図である。
第５図は従来の直接膨張冷凍機を用いた冷凍装置を示す
説明図である。
〔主要な部分の符号の説明〕
２０・・・圧縮機
２１・・・高圧ガスライン
２２ ・ ・ ・
２３ ・ ・ ・
２４ ・ ・ ・
２５ ・ ・ ・
２６ ・ ・ ・
２７ ・ ・ ・
２８ ・ ・ ・
２９ ・ ・ ・
３０ ・ ・ ・
３１ ・ ・ ・
３２ ・ ・ ・
３３ ・ ・ ・
３４ ・ ・ ・
３５ ・ ・ ・
３６ ・ ・ ・
３７ ・ ・ ・
３８ ・ ・ ・
３９ ・ ・ ・
４０ ・ ・ ・
４１ ・ ・ ・
凝縮器
高圧液ライン
膨張弁
低圧レシーバ
液ポンプ
低圧液ライン
蒸発器
第一低圧ガスライン
第二低圧ガスライン
第一バイパスライン
第一切換弁
第二バイパスライン
第二切換弁
第二膨張弁
間接冷却器
第三バイパスライン
第三切換弁
第四切換弁
蒸発圧力調整弁
第五切換弁。FIG. 1 is an explanatory diagram showing a refrigeration system for cooling both a low-temperature medium and a high-temperature medium according to an embodiment of the present invention. FIG. 2 is an explanatory diagram showing a state in which a normal refrigeration cycle is operated. FIG. 3 is an explanatory diagram showing a cooling operation state that does not use a compressor and approximates natural refrigerant circulation. FIG. 4 is an explanatory diagram showing a cooling operation state in which a compressor is not used and the air conditioner is forced to approximate natural refrigerant circulation. FIG. 5 is an explanatory diagram showing a refrigeration system using a conventional direct expansion refrigerator. [Explanation of symbols of main parts] 20... Compressor 21... High pressure gas line 22 23 24 25 25 26 27 28 28 29 ・ ・ ・ 30 ・ ・ ・ 31 ・ ・ ・ 32 ・ ・ 33 ・ ・ ・ 34 ・ ・ ・ 35 ・ ・ ・ 36 ・ ・ ・ 37 ・ ・ ・ 38 ・ ・ ・ 39 ・ ・ ・ 40 ・ ・ ・ 41 ・・ ・ Condenser High pressure liquid line Expansion valve Low pressure receiver Liquid pump Low pressure liquid line Evaporator 1st low pressure gas line 2nd low pressure gas line 1st bypass line 1st switching valve 2nd bypass line 2nd switching valve 2nd expansion valve Indirect cooling 3rd bypass line 3rd switching valve 4th switching valve Evaporation pressure adjustment valve 5th switching valve.
Claims (1)
プと蒸発器とを備え、圧縮機と凝縮器とを高圧ガスライ
ンで連結し、凝縮器と低圧レシーバとを膨張弁を介装し
て高圧液ラインで連結し、低圧レシーバと蒸発器とを液
ポンプを介装して低圧液ラインで連結し、蒸発器と低圧
レシーバとを第一低圧ガスラインで連結し、低圧レシー
バと圧縮機とを第二低圧ガスラインとを連結することに
よって冷凍サイクルを形成して成る冷凍装置に於て、高
圧ガスラインと第一低圧ガスラインとを第一切換弁を介
装した第一バイパスラインで連結し、高圧液ラインと第
二低圧ガスラインとを第二切換弁と第二膨張弁と間接冷
却器とを介装した第二バイパスラインで連結し、第一バ
イパスラインと低圧レシーバとを第三切換弁を介装した
第三バイパスラインを連結すると共に、この第三バイパ
スラインを上記第二バイパスラインに設けた間接冷却器
中を貫通させて、第二バイパスラインと熱的に連結し、
第一低圧ガスラインに於ける第一バイパスラインとの連
結部よりも低圧レシーバ側に第四切換弁を設け、第二低
圧ガスラインに蒸発圧力調整弁を設け、且つ、高圧液ラ
インに於ける膨張弁と第二バイパスラインとの連結部と
の間に第五切換弁を設けたことを特徴とする低温媒体及
び高温媒体兼用冷却用冷凍装置。(1) Equipped with a compressor, a condenser, an expansion valve, a low-pressure receiver, a liquid pump, and an evaporator, the compressor and condenser are connected by a high-pressure gas line, and the condenser and low-pressure receiver are connected with an expansion valve. The low pressure receiver and the evaporator are connected by a low pressure liquid line via a liquid pump, the evaporator and the low pressure receiver are connected by a first low pressure gas line, and the low pressure receiver and the compressor are connected by a first low pressure gas line. In a refrigeration system in which a refrigeration cycle is formed by connecting a first low-pressure gas line and a first low-pressure gas line, a first bypass line in which a first switching valve is interposed between the high-pressure gas line and the first low-pressure gas line is used. The high-pressure liquid line and the second low-pressure gas line are connected by a second bypass line interposed with a second switching valve, a second expansion valve, and an indirect cooler, and the first bypass line and the low-pressure receiver are connected. A third bypass line equipped with a third switching valve is connected, and the third bypass line is passed through an indirect cooler provided in the second bypass line to be thermally connected to the second bypass line. ,
A fourth switching valve is provided in the first low pressure gas line closer to the low pressure receiver than the connecting portion with the first bypass line, an evaporation pressure adjustment valve is provided in the second low pressure gas line, and a fourth switching valve is provided in the high pressure liquid line. A refrigeration system for cooling both low-temperature medium and high-temperature medium, characterized in that a fifth switching valve is provided between the expansion valve and the connection part with the second bypass line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4453089A JPH0794926B2 (en) | 1989-02-23 | 1989-02-23 | Refrigerating device for both low temperature medium and high temperature medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4453089A JPH0794926B2 (en) | 1989-02-23 | 1989-02-23 | Refrigerating device for both low temperature medium and high temperature medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02223773A true JPH02223773A (en) | 1990-09-06 |
| JPH0794926B2 JPH0794926B2 (en) | 1995-10-11 |
Family
ID=12694069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4453089A Expired - Fee Related JPH0794926B2 (en) | 1989-02-23 | 1989-02-23 | Refrigerating device for both low temperature medium and high temperature medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0794926B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005001345A1 (en) * | 2003-06-25 | 2005-01-06 | Star Refrigeration Limited | Improved cooling system |
| JP2010533280A (en) * | 2007-07-11 | 2010-10-21 | リーバート・コーポレイシヨン | Method and apparatus for equalizing pumping refrigerant system |
| WO2013177872A1 (en) * | 2012-05-31 | 2013-12-05 | 艾默生网络能源有限公司 | Air conditioning system |
| CN103759479A (en) * | 2014-02-21 | 2014-04-30 | 广东志高暖通设备股份有限公司 | Refrigerating equipment |
| WO2022160339A1 (en) * | 2021-01-27 | 2022-08-04 | 苏州必信空调有限公司 | Two-phase flow air conditioning system with free cooling function |
-
1989
- 1989-02-23 JP JP4453089A patent/JPH0794926B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005001345A1 (en) * | 2003-06-25 | 2005-01-06 | Star Refrigeration Limited | Improved cooling system |
| JP2010533280A (en) * | 2007-07-11 | 2010-10-21 | リーバート・コーポレイシヨン | Method and apparatus for equalizing pumping refrigerant system |
| WO2013177872A1 (en) * | 2012-05-31 | 2013-12-05 | 艾默生网络能源有限公司 | Air conditioning system |
| CN103759479A (en) * | 2014-02-21 | 2014-04-30 | 广东志高暖通设备股份有限公司 | Refrigerating equipment |
| WO2022160339A1 (en) * | 2021-01-27 | 2022-08-04 | 苏州必信空调有限公司 | Two-phase flow air conditioning system with free cooling function |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0794926B2 (en) | 1995-10-11 |
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