JPH1123188A - Circulation pipe for heat storage system - Google Patents
Circulation pipe for heat storage systemInfo
- Publication number
- JPH1123188A JPH1123188A JP17578997A JP17578997A JPH1123188A JP H1123188 A JPH1123188 A JP H1123188A JP 17578997 A JP17578997 A JP 17578997A JP 17578997 A JP17578997 A JP 17578997A JP H1123188 A JPH1123188 A JP H1123188A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- circulation pipe
- polyethylene
- circulation
- heat storage
- 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.)
- Withdrawn
Links
Landscapes
- Other Air-Conditioning Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はビル等の空調設備に
使用する、氷蓄熱システムでの循環管に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation pipe in an ice heat storage system used for air conditioning equipment in buildings and the like.
【０００２】[0002]
【従来の技術】ビル等の空調設備に使用する蓄熱システ
ムとして、氷の潜熱を利用する、氷蓄熱システムを用い
ることがある。この氷蓄熱システムにおいては、冷媒循
環系統の蒸発器としての循環管を水槽（蓄熱槽）内に配
設しており、冷媒循環系統において圧縮機からの圧縮冷
媒を凝縮器で放熱液化させ、この液化冷媒を膨張弁に通
して膨張させ、更に蒸発器を通過する間に蒸発器（循環
管）の周囲の水を氷結させその氷の付着で蓄熱を行わ
せ、循環管を通過した蒸発冷媒を圧縮機を吸入させ、以
後、上記を１サイクルとして冷媒を循環させている。そ
して、蓄熱システムの冷水を必要に応じ空調器に循環し
て熱交換器で室内空調を行っている。2. Description of the Related Art There is a case where an ice heat storage system utilizing the latent heat of ice is used as a heat storage system used for air conditioning equipment in a building or the like. In this ice heat storage system, a circulation pipe as an evaporator of a refrigerant circulation system is disposed in a water tank (heat storage tank). In the refrigerant circulation system, compressed refrigerant from the compressor is radiated and liquefied by a condenser. The liquefied refrigerant is expanded through the expansion valve, and the water around the evaporator (circulation tube) is frozen while passing through the evaporator, and heat is stored by the adhesion of the ice. The compressor is sucked in, and thereafter the refrigerant is circulated as one cycle. And the cold water of a heat storage system is circulated to an air conditioner as needed, and indoor air conditioning is performed by a heat exchanger.
【０００３】上記蒸発器としての循環管は、水槽内に所
定の配置・密度で配設してあり、良熱伝導性や水に対す
る耐腐食性が要求され、外面にプラスチック層を被覆し
た金属管が好適とされている。The circulation pipe as the evaporator is disposed in a water tank at a predetermined arrangement and density, requires good thermal conductivity and corrosion resistance to water, and is a metal pipe having an outer surface coated with a plastic layer. Are preferred.
【０００４】[0004]
【発明が解決しようとする課題】従来、上記冷媒にはＣ
ＦＣ（クロロフルオロカ−ボン）−１２やＨＣＦＣ（ハ
イドロクロロフルオロカ−ボン）−２２等のフロン化合
物が使用されていたが、近来、これらのフロン化合物の
オゾン層破壊による地球環境破壊が地球規模のもとで問
題視され、新冷媒に代替されつつある。Conventionally, the above-mentioned refrigerant has C
Fluorocarbon compounds such as FC (chlorofluorocarbon) -12 and HCFC (hydrochlorofluorocarbon) -22 have been used, but recently, the destruction of the global environment due to the destruction of the ozone layer by these chlorofluorocarbons has become global. And is being replaced by new refrigerants.
【０００５】この代替冷媒に要求される条件としては、
オゾン破壊係数及び地球温暖化係数が０乃至僅小である
ことが要求され、かかる冷媒としてはＨＦＣ−３２（Ｃ
Ｈ2Ｆ2）、ＨＦＣ−１２５（ＣＨＦ2ＣＦ3）、ＨＦＣ−
１３４ａ（ＣＨ2ＦＣＦ3）等がある。上記冷媒には、冷
媒循環系の可動部の摩耗を防止し、循環路の閉塞を阻止
するために潤滑油を混合する必要があり、従来、この潤
滑油には鉱油を使用している。しかしながら、鉱油は上
記新冷媒に対し相溶性が悪く、新冷媒に対する潤滑油と
してはポリアルキレングリコ−ル、ポリオ−ルエステル
が適切である。The conditions required for this alternative refrigerant include:
It is required that the ozone depletion potential and the global warming potential are 0 to very low, and HFC-32 (C
H 2 F 2), HFC- 125 (CHF 2 CF 3), HFC-
134a (CH 2 FCF 3 ). It is necessary to mix a lubricating oil with the refrigerant in order to prevent abrasion of movable parts of the refrigerant circulation system and to prevent blockage of the circulation path. Conventionally, mineral oil is used as the lubricating oil. However, mineral oil has poor compatibility with the new refrigerant, and polyalkylene glycols and polyol esters are suitable as lubricating oils for the new refrigerant.
【０００６】ところが、これらの潤滑油（ポリアルキレ
ングリコ−ル、ポリオ−ルエステル等）は、従来の鉱油
系のものに較べて吸湿性が著しく高く（鉱油系の飽和水
分量が５０ｐｐｍ以下であるのに対し、例えば、ポリオ
−ルエステル系の飽和水分量は２０００ｐｐｍ以上であ
る）、上記循環管では内面腐食（金属石鹸等によるスラ
ッジの生成も含む）による製氷効率の低下が懸念され
る。However, these lubricating oils (polyalkylene glycols, polyol esters, etc.) have remarkably high hygroscopicity as compared with conventional mineral oils (the mineral oil has a saturated water content of 50 ppm or less). On the other hand, for example, the saturated water content of a polyol ester system is 2000 ppm or more), and there is a concern that the ice making efficiency may be reduced due to inner surface corrosion (including sludge generation by metal soap or the like) in the above-mentioned circulation pipe.
【０００７】本発明の目的は、氷蓄熱システムにおい
て、冷媒に含水潤滑油混合の冷媒を用いても、循環管の
内面腐食による熱伝導性の低下を防止して製氷率を安定
に保持し得、しかも高製氷率の保証、循環管の容易加工
性等を確保できる蓄熱システム用循環管を提供すること
にある。An object of the present invention is to prevent a decrease in heat conductivity due to corrosion of the inner surface of a circulating pipe and stably maintain an ice-making rate even in a case where an ice heat storage system uses a refrigerant mixed with water-containing lubricating oil. Another object of the present invention is to provide a circulation pipe for a heat storage system that can ensure a high ice-making rate and ensure easy workability of the circulation pipe.
【０００８】[0008]
【課題を解決するための手段】本発明に係る蓄熱システ
ム用循環管は、蓄熱槽の水を、該蓄熱槽内に配設したコ
イル状またはジグザグ状の循環管に流通する冷媒により
氷結させて蓄熱する蓄熱システムの循環管であり、アル
ミニウム管の内面及び外面にポリエチレンまたは架橋ポ
リエチレンを被覆した厚み１．０〜３．０ｍｍの複合管
からなることを特徴とする構成である。A circulating pipe for a heat storage system according to the present invention freezes water in a heat storage tank with a refrigerant flowing through a coiled or zigzag circulating pipe disposed in the heat storage tank. This is a circulation pipe of a heat storage system that stores heat, and is configured to be a composite pipe having a thickness of 1.0 to 3.0 mm in which an inner surface and an outer surface of an aluminum tube are coated with polyethylene or crosslinked polyethylene.
【０００９】[0009]
【発明の実施の形態】以下、図面を参照しつつ本発明の
実施の形態について説明する。図１は本発明に係る循環
管を用いた蓄熱システムを示し、密閉式である。図１に
おいて、１は密閉水槽である。２は水槽１内に配設した
本発明に係る循環管であり、図２に示すように、アルミ
ニウム管２１の内面及び外面にポリエチレン層または架
橋ポリエチレン層２２及び２３を被覆した厚み１．０〜
３．０ｍｍの複合管を多段ジグザグ状またはコイル状パ
タ−ンで配設してある。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a heat storage system using a circulation pipe according to the present invention, which is a closed type. In FIG. 1, reference numeral 1 denotes a closed water tank. Reference numeral 2 denotes a circulation pipe according to the present invention disposed in the water tank 1. As shown in FIG. 2, the inner and outer surfaces of the aluminum pipe 21 are coated with polyethylene layers or crosslinked polyethylene layers 22 and 23 to a thickness of 1.0 to 1.0.
A 3.0 mm composite pipe is arranged in a multi-stage zigzag or coil pattern.
【００１０】この配設パタ−ンには、既に出願人が提案
した多段の交互逆方向流通パタ−ン、すなわち「複数の
循環管を、それぞれの各屈曲部が並行する平面内にてジ
グザグ状に位置するように連続的に屈曲して相隣する各
循環管を千鳥状に配設すると共に相隣する各循環管の冷
媒流通方向を逆方向とするパタ−ン（実公平６−２００
３６号）」を施用することが好ましい。The arrangement pattern includes a multi-stage alternating reverse flow pattern already proposed by the applicant, that is, "a plurality of circulation pipes are zigzag in a plane in which each bent portion is parallel to each other. The adjacent circulation pipes are continuously bent so as to be located in a zigzag pattern, and the refrigerant circulation direction of the adjacent circulation pipes is reversed.
No. 36) ".
【００１１】図１において、３は循環管２に連結した圧
縮機、４は凝縮器、５は膨張弁である。６は循環ポン
プ、７は空調器である。上記蓄熱システムは深夜電力を
利用して稼働され、その稼働中、圧縮機３出口での冷媒
は高温・高圧の加熱状態にあり、これが凝縮器４で飽和
液状態にまで冷却され、この冷媒液が膨張弁５で減圧さ
れ、この減圧状態の湿り蒸気冷媒が循環管２を通過する
間、循環管２外面の接触水から熱を吸収して循環管２外
部の水が氷結され、更に、循環管２を通過した冷媒が圧
縮器機３に吸入され、以上を１サイクルとして冷媒が循
環されていく。In FIG. 1, 3 is a compressor connected to the circulation pipe 2, 4 is a condenser, and 5 is an expansion valve. 6 is a circulation pump, 7 is an air conditioner. The heat storage system is operated by using midnight power. During the operation, the refrigerant at the outlet of the compressor 3 is in a high-temperature and high-pressure heating state, which is cooled to a saturated liquid state by the condenser 4, and Is depressurized by the expansion valve 5, and while the depressurized wet steam refrigerant passes through the circulation pipe 2, heat is absorbed from the contact water on the outer surface of the circulation pipe 2, and the water outside the circulation pipe 2 is frozen and further circulated. The refrigerant that has passed through the pipe 2 is sucked into the compressor 3, and the refrigerant is circulated in one cycle as described above.
【００１２】上記循環管２外部での氷結の状態で蓄熱が
行われ、水槽１内の冷水の循環ポンプ６による空調器７
への循環で空調が行われていく。上記冷媒として、近来
においてはＨＦＣ−３２（ＣＨ2Ｆ2）、ＨＦＣ−１２５
（ＣＨＦ2ＣＦ3）、ＨＦＣ−１３４ａ（ＣＨ2ＦＣＦ3）
等の新冷媒が使用され、この新冷媒にはポリアルキレン
グリコ−ル、ポリオ−ルエステル等が潤滑油として混合
され、この潤滑油の高吸湿性のために多量の水がこの潤
滑油混合冷媒に含有され、循環管内面と水分との接触が
避けられない。Heat is stored in a frozen state outside the circulation pipe 2, and an air conditioner 7 is operated by a circulating pump 6 of cold water in the water tank 1.
Air conditioning is performed by circulation to the air. As the refrigerant, HFC-32 (CH 2 F 2 ) and HFC-125 have recently been used.
(CHF 2 CF 3 ), HFC-134a (CH 2 FCF 3 )
The new refrigerant is mixed with polyalkylene glycol, polyol ester, etc. as a lubricating oil, and a large amount of water is added to the lubricating oil mixed refrigerant due to the high hygroscopicity of the lubricating oil. It is contained, and contact between the inner surface of the circulation pipe and moisture is inevitable.
【００１３】しかしながら、本発明においては、循環管
に、アルミニウム管の内面に化学的に安定なポリエチレ
ンまたは架橋ポリエチレンを被覆した複合管を使用して
いるから、潤滑油混合冷媒に多量に水分が含有されてい
ても、その被覆層の化学的安定性のために、循環管の内
面を加水分解劣化等を排除して安定に保持して腐食から
保護できる。However, in the present invention, since the composite pipe in which the inner surface of the aluminum pipe is coated with chemically stable polyethylene or crosslinked polyethylene is used for the circulation pipe, a large amount of water is contained in the lubricating oil mixed refrigerant. Even if the coating is performed, the inner surface of the circulation pipe can be stably retained by excluding hydrolysis deterioration and the like, thereby protecting it from corrosion because of the chemical stability of the coating layer.
【００１４】勿論、循環管の外面にも、化学的に安定な
ポリエチレンまたは架橋ポリエチレンを被覆してあるか
ら、循環管外面の腐食も排除できる。被覆層に化学的に
安定なポリエチレンまたは架橋ポリエチレンを使用して
も、金属が銅であれば、電線の水トリ−現象で観られる
ように銅が応力腐食することがあるが、本発明に係る循
環管としての複合管においては、金属にアルミニウム合
金を使用しており、かかる面からも循環管を腐食からよ
く保護して安定に保持できる。更に、後述の通り、ポリ
エチレン層に対するアルミニウム合金の接着性は、ポリ
エチレン層に対する銅の接着性やポリ塩化ビニル層に対
するアルミニウム合金の接着性等に較べ著しく優れてお
り、本発明において使用した複合管においては、金属と
被覆層との接着強度が高く、かかる面からも循環管を腐
食からよく保護して安定に保持できる。Of course, since the outer surface of the circulation pipe is also coated with chemically stable polyethylene or cross-linked polyethylene, corrosion on the outer surface of the circulation pipe can be eliminated. Even if chemically stable polyethylene or crosslinked polyethylene is used for the coating layer, if the metal is copper, copper may be stress-corroded as seen in the water trilling phenomenon of the electric wire. In the composite pipe as the circulation pipe, an aluminum alloy is used for the metal, and the circulation pipe can be well protected from corrosion and stably held from such a surface. Furthermore, as described later, the adhesiveness of the aluminum alloy to the polyethylene layer is significantly superior to the adhesiveness of copper to the polyethylene layer and the adhesiveness of the aluminum alloy to the polyvinyl chloride layer. Has a high adhesive strength between the metal and the coating layer, and can protect the circulation tube from corrosion well from such a surface and stably maintain the circulation tube.
【００１５】従って、本発明に係る蓄熱システム用循環
管においては、蓄熱システムの冷媒に吸湿性潤滑油を混
合した冷媒を使用しても、循環管の熱伝導性を、その循
環管材である複合管のアルミニウム合金とポリエチレン
または架橋ポリエチレンとの相乗作用で腐食の発生なく
本来の高熱伝導性に保持でき、長期にわたり高い製氷率
を保証できる。Therefore, in the circulation pipe for a heat storage system according to the present invention, even if a refrigerant in which a hygroscopic lubricating oil is mixed with the refrigerant of the heat storage system is used, the heat conductivity of the circulation pipe is maintained by the composite material of the circulation pipe. Synergy between the aluminum alloy of the tube and polyethylene or cross-linked polyethylene can maintain the original high thermal conductivity without corrosion and can guarantee a high ice-making rate for a long time.
【００１６】上記複合管のポリエチレンまたは架橋ポリ
エチレン層の厚みを厚くし過ぎると、複合管の熱伝導性
が低くなって製氷効率上不利であり、薄くし過ぎると、
機械的強度が不足して上記の腐食防止を満足に行い難く
なる。従って、内部プラスチック層及び外部プラスチッ
ク層のそれぞれの厚みは、複合管外径の０．００６〜
０．０７５倍とすることが好ましく、０．０４倍とする
ことが最適であるるい。If the thickness of the polyethylene or cross-linked polyethylene layer of the composite tube is too large, the heat conductivity of the composite tube becomes low, which is disadvantageous in terms of ice making efficiency.
Due to insufficient mechanical strength, it is difficult to satisfactorily prevent the above corrosion. Therefore, the thickness of each of the inner plastic layer and the outer plastic layer is 0.006 to 0.006 of the outer diameter of the composite pipe.
It is preferably 0.075 times, and most preferably 0.04 times.
【００１７】また、複合管のアルミニウム管の厚みを薄
くし過ぎると、プラスチック・金属複合管全体の熱伝導
性が低くなって製氷効率上不利となり、厚くし過ぎる
と、循環管への曲げ加工が困難になる。従って、アルミ
ニウム管の厚みは、複合管外径の０．００６〜０．０１
９倍とすることが好ましく、０．０１倍とすることが最
適である。On the other hand, if the thickness of the aluminum tube of the composite tube is too thin, the thermal conductivity of the entire plastic / metal composite tube becomes low, which is disadvantageous in terms of ice making efficiency. It becomes difficult. Therefore, the thickness of the aluminum pipe is 0.006 to 0.01 times the outer diameter of the composite pipe.
It is preferably 9 times, and most preferably 0.01 times.
【００１８】表１は厚み０．２ｍｍの金属管の内外面に
略等しい厚みでプラスチック層を被覆した、厚み１．５
ｍｍ、外径１６ｍｍの複合管におけるプラスチック被覆
層の接着強度、複合管の曲げ加工性、複合管の耐偏平性
を測定乃至は評価した結果である。ただし、接着強度
は、製品から長さ６０ｍｍ×巾１０ｍｍの短冊状試料を
カットし、速度２００ｍｍ／分でピ−リングすることに
より求めた。曲げ加工性はＲ８０での曲げ加工を人力で
容易に行い得たものを○、人力で行い得るが相当に困難
であったものを△、機械力を必要としたものを×とし
た。耐偏平性は製品から長さ６０ｍｍの試料をカット
し、偏平試験機で１０ｍｍ／分の速度で偏平にし、５０
％時での荷重を測定した。Table 1 shows that the inner and outer surfaces of a metal tube having a thickness of 0.2 mm were covered with a plastic layer with substantially the same thickness.
5 shows the results of measuring or evaluating the adhesive strength of the plastic coating layer, the bending workability of the composite pipe, and the flatness resistance of the composite pipe in a composite pipe having an outer diameter of 16 mm and an outer diameter of 16 mm. However, the adhesive strength was determined by cutting a strip sample having a length of 60 mm and a width of 10 mm from the product and peeling the sample at a speed of 200 mm / min. The bending workability was evaluated as "O" when the bending at R80 was easily performed by human power, "A" when the bending was easily performed by human power but was considerably difficult, and "X" when the mechanical power was required. The flatness was measured by cutting a 60 mm long sample from the product, flattening it at a rate of 10 mm / min with a flatness tester,
The load at% was measured.
【００１９】[0019]
【表１】 [Table 1]
【００２０】本発明に係る循環管として使用したポリエ
チレン・アルミニウム複合管は、肉厚を１．０〜３．０
ｍｍとしており、上記の試料１（肉厚１．５ｍｍ）の曲
げ加工性を充分に保持でき、循環管のコイル成形または
ジグザグ成形を容易に行うことができる。また、耐偏平
強度も充分であり、蓄熱槽内に安定に保持でき、形状保
持性も良好である。The polyethylene-aluminum composite pipe used as the circulation pipe according to the present invention has a wall thickness of 1.0 to 3.0.
mm, the bending workability of the sample 1 (1.5 mm in thickness) can be sufficiently maintained, and the coil or zigzag forming of the circulation tube can be easily performed. In addition, it has a sufficient flat strength, can be stably held in the heat storage tank, and has good shape retention.
【００２１】[0021]
【発明の効果】本発明に係る蓄熱システム用循環管にお
いては、蓄熱システムの冷媒にフロン代替冷媒としてポ
リアルキレングリコ−ル、ポリオ−ルエステル等の吸湿
性潤滑油を混合した新冷媒を用いても、循環管を内面の
腐食の畏れなく高熱伝導性に保持でき、長期にわたり安
定な製氷率を維持できる。また、循環管の曲げ加工が容
易であり、更に、循環管単位長さ当たりの熱伝導を高く
できてそれだけ循環管の長さを短くできるから、蓄熱シ
ステムの組立て作業の簡易化、循環管の小型化等を図り
得る有利性もある。In the circulation pipe for a heat storage system according to the present invention, a new refrigerant in which a hygroscopic lubricating oil such as polyalkylene glycol, polyol ester or the like is mixed as the refrigerant for the heat storage system is used as the refrigerant for the heat storage system. In addition, the circulation pipe can be maintained at a high thermal conductivity without fear of corrosion of the inner surface, and a stable ice making rate can be maintained for a long time. In addition, the bending process of the circulation pipe is easy, and the heat conduction per unit length of the circulation pipe can be increased, so that the length of the circulation pipe can be shortened accordingly. There is also an advantage that the size can be reduced.
【図１】本発明に係る循環管を用いた蓄熱システムの一
例を示す図面である。FIG. 1 is a drawing showing an example of a heat storage system using a circulation pipe according to the present invention.
【図２】本発明に係る循環管の複合管を示す断面図であ
る。FIG. 2 is a sectional view showing a composite pipe of a circulation pipe according to the present invention.
【符号の説明】 １ 蓄熱槽 ２ 循環管 ３ 圧縮機 ４ 凝縮器 ５ 膨張弁 ６ 循環ポンプ ７ 空調器 ２１ アルミニウム管 ２２ ポリエチレン又は架橋ポリエチレン層 ２３ ポリエチレン又は架橋ポリエチレン層[Description of Signs] 1 heat storage tank 2 circulation pipe 3 compressor 4 condenser 5 expansion valve 6 circulation pump 7 air conditioner 21 aluminum pipe 22 polyethylene or cross-linked polyethylene layer 23 polyethylene or cross-linked polyethylene layer
Claims (1)
ル状またはジグザグ状の循環管に流通する冷媒により氷
結させて蓄熱する蓄熱システムの循環管であり、、アル
ミニウム管の内面及び外面にポリエチレンまたは架橋ポ
リエチレンを被覆した厚み１．０〜３．０ｍｍの複合管
からなることを特徴とする蓄熱システム用循環管。1. A circulating pipe of a heat storage system for storing water by freezing water in a heat storage tank with a refrigerant flowing through a coiled or zigzag circulating pipe disposed in the heat storage tank and storing heat. A circulating pipe for a heat storage system, comprising a composite pipe having an outer surface coated with polyethylene or crosslinked polyethylene and having a thickness of 1.0 to 3.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17578997A JPH1123188A (en) | 1997-07-01 | 1997-07-01 | Circulation pipe for heat storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17578997A JPH1123188A (en) | 1997-07-01 | 1997-07-01 | Circulation pipe for heat storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1123188A true JPH1123188A (en) | 1999-01-26 |
Family
ID=16002287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17578997A Withdrawn JPH1123188A (en) | 1997-07-01 | 1997-07-01 | Circulation pipe for heat storage system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1123188A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100329271B1 (en) * | 2000-04-03 | 2002-03-18 | 구자홍 | Plastic evaporator for refrigerator |
| JP2009150573A (en) * | 2007-12-19 | 2009-07-09 | Mitsubishi Electric Corp | Double pipe type heat exchanger, its manufacturing method, and heat pump system comprising the same |
| ITMI20082039A1 (en) * | 2008-11-17 | 2010-05-18 | Ilpea Ind Spa | COOLING CIRCUIT |
| US7735461B2 (en) * | 2008-02-19 | 2010-06-15 | Aqwest Llc | Engine cooling system with overload handling capability |
| WO2010036670A3 (en) * | 2008-09-24 | 2010-07-08 | Earth To Air Systems, Llc | Heat transfer refrigerant transport tubing coatings and insulation for a direct exchange geothermal heating/cooling system and tubing spool core size |
-
1997
- 1997-07-01 JP JP17578997A patent/JPH1123188A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100329271B1 (en) * | 2000-04-03 | 2002-03-18 | 구자홍 | Plastic evaporator for refrigerator |
| JP2009150573A (en) * | 2007-12-19 | 2009-07-09 | Mitsubishi Electric Corp | Double pipe type heat exchanger, its manufacturing method, and heat pump system comprising the same |
| US7735461B2 (en) * | 2008-02-19 | 2010-06-15 | Aqwest Llc | Engine cooling system with overload handling capability |
| WO2010036670A3 (en) * | 2008-09-24 | 2010-07-08 | Earth To Air Systems, Llc | Heat transfer refrigerant transport tubing coatings and insulation for a direct exchange geothermal heating/cooling system and tubing spool core size |
| ITMI20082039A1 (en) * | 2008-11-17 | 2010-05-18 | Ilpea Ind Spa | COOLING CIRCUIT |
| WO2010055468A1 (en) * | 2008-11-17 | 2010-05-20 | Industrie Ilpea S.P.A. | Refrigeration circuit |
| CN102265102A (en) * | 2008-11-17 | 2011-11-30 | 伊尔皮亚工业股份公司 | Refrigeration circuit |
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