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Published byMyra Brooks Modified over 8 years ago
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CHAPTER 11 Refrigeration Cycles
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10-1 The objective of a refrigerator is to remove heat (Q L ) from the cold medium; the objective of a heat pump is to supply heat (Q H ) to a warm medium. ( 대기, 지열, 바다 )
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10-3 Schematic and T-s diagram for the ideal vapor-compression refrigeration cycle.
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냉매 탄화수소계 ( 프로판, 에탄, 에틸렌 …), CO2, air… Ammonia- low cost, high COP, toxic – 대형 상업용 냉동기 Chlorofluorocarbon 계열 ( CFC- R-11, R-12, R-22, R115, R502(R115+R22): 프레온 ) – 오존층 파괴 R134a- Cl 없음. 1 냉동톤 (tons of refrigeration) – 24 시간에 0 o C 인 물 1 ton 을 0 o C 의 얼음으로 만드는 냉동장치의 능력 증기압축 냉동기 : 구조간단, 저가, 믿을만하고 고장이 거의 없다.
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10-4 An ordinary household refrigerator.
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10-5 The P-h diagram of an ideal vapor- compression refrigeration cycle.
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10-6 Schematic and T-s diagram for the actual vapor-compression refrigeration cycle. 8-1 사이 거리가 통상 길다 압축기에서 외부로의 열손실
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FIGURE 10-16 Simple gas refrigeration cycle. 10-12 역 Brayton cycle : 공기 압축 냉동기 비행기 냉동
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10-14 An open-cycle aircraft cooling system.
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10-16 Ammonia absorption refrigeration cycle. 흡수식 냉동기 냉매 ( 암모니아 )- 운반물질 ( 물 ) Water- lithium bromide 암모니아 흡수반응 : 발열 반응 저온이어야 용이함 Q gen >>W pump
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10-18 When one of the junctions of two dissimilar metals is heated, a current I flows through the closed circuit. Seebeck 효과 열전대 발전 thermoelectric
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10-22 When a current is passed through the junction of two dissimilar materials, the junction is cooled. Peltier effect low COP
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10-23 FIGURE 10-28 A thermoelectric refrigerator.
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