• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.4
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• pp.1427-1433
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• 2012

In this paper, cycle performance analysis of cascade refrigeration system using alternative FREON refrigerants and natural refrigerants are presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooled and superheated degree, and condensing and evaporating temperature, temperature difference of cascade heat exchanger in cascade refrigeration system. The COP of cascade refrigeration system increases with the increasing subcooled degree, but there is no significant changes with the increasing superheated degree. The COP of cascade refrigeration system depends on evaporating and condensing temperatures of cascade heat exchanger. Therefore, subcooled degree, evaporating and condensing temperature of cascade heat exchanger using alternative FREON refrigerants and natural refrigerants have an effect on the COP of this system. In this paper, COP of cascade refrigeration system using (R23 / R290), (R23 / R600), (R23 / R600a), (R23 / R717), (R744 / R404A) are higher 20 ~ 36 % than (R23 / R22), using R23 for low temperature system and R22 for high temperature system.

• Defense and Technology
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• no.5 s.243
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• pp.80-87
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• 1999

기존 에어콘의 냉매로 사용되던 프레온이 지구 환경 파괴의 주범으로 알려지고 있는데, 프레온이 포함하고 있는 염소가 대기의 성층권에서 자외선을 촉매로 하여 오존과 반응함으로써 결국 오존층을 파괴한다는 과학적인 연구 결과가 계속 발표되면서 1987년 3월에 채택된 몬트리올 의정서(Montreal Protocol)에 의해서 처음으로 그 생산 및 사용이 강제적으로 규제되었고 계속적인 가입국 회의에서 그 규제가 강화되고 있는 실정이다. 따라서 선진국에서는 대체 냉매의 개발과 더불어 대체 냉매를 사용한 공조 시스템 요소의 최적화가 새로운 쟁점으로 떠오르고 있다.

• JOURNAL OF ELECTRICAL WORLD
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• no.9 s.201
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• pp.82-88
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• 1993

• 발명특허
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• v.17 no.10 s.200
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• pp.40-45
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• 1992

• 공원문화
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• s.43
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• pp.36-36
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• 1989

• 동위원소뉴스
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• no.6 s.18
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• pp.7-9
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• 1998

• Air Cleaning Technology
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• v.8 no.2 s.29
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• pp.71-87
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• 1995

• 방재와보험
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• s.47
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• pp.44-45
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• 1990

• Solar Energy
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• v.10 no.2
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• pp.18-27
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• 1990

The hot water producer by the combination of the solar thermal energy and freon gas compression heat has been developed. Freon R-12 gas was circulated through the system including the solar absorption panel, which has no glassing and no insulation, and the frozen and burst problems were intrinsically eliminated. The manufacturing and running costs may go further down than the regular solar hot water systems.

• Vending industry
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• v.8 no.1 s.22
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• pp.112-113
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• 2008