1 / 13

CHAPTER 11

CHAPTER 11. Refrigeration Cycles. 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). 10-1. Schematic and T- s diagram for the ideal vapor-compression refrigeration cycle.

coye
Download Presentation

CHAPTER 11

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CHAPTER 11 Refrigeration Cycles

  2. The objective of a refrigerator is to remove heat (QL) from the cold medium; the objective of a heat pump is to supply heat (QH) to a warm medium. (대기, 지열, 바다) 10-1

  3. Schematic and T-s diagram for the ideal vapor-compression refrigeration cycle. 10-3

  4. 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) – 24시간에 0oC인 물 1 ton 을 0oC 의 얼음으로 만드는 냉동장치의 능력 증기압축 냉동기 : 구조간단, 저가, 믿을만하고 고장이 거의 없다.

  5. An ordinary household refrigerator. 10-4

  6. The P-h diagram of an ideal vapor-compression refrigeration cycle. 10-5

  7. Schematic and T-s diagram for the actual vapor-compression refrigeration cycle. 8-1 사이 거리가 통상 길다 압축기에서 외부로의 열손실 10-6

  8. FIGURE 10-16Simple gas refrigeration cycle. 역Brayton cycle : 공기 압축 냉동기 비행기 냉동 10-12

  9. An open-cycle aircraft cooling system. 10-14

  10. 흡수식 냉동기 냉매(암모니아)-운반물질(물) Water- lithium bromide Ammonia absorption refrigeration cycle. Qgen >>Wpump 암모니아 흡수반응 : 발열 반응 저온이어야 용이함 10-16

  11. When one of the junctions of two dissimilar metals is heated, a current I flows through the closed circuit. Seebeck 효과 열전대 발전 thermoelectric 10-18

  12. When a current is passed through the junction of two dissimilar materials, the junction is cooled. Peltier effect low COP 10-22

  13. FIGURE 10-28A thermoelectric refrigerator. 10-23

More Related