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Published in:
2024 | OriginalPaper | Chapter
12. Refrigeration Systems
Author : Syed S. H. Rizvi
Published in: Food Engineering Principles and Practices
Publisher: Springer International Publishing
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Abstract
Your kitchen refrigerator (or any other) cools food by removing heat from its interior and dumping it into the kitchen. This means it moves heat from a cold place to a warm place. However, the second law of thermodynamics states that it is impossible for heat to flow from a cold body to a warm body, while the reverse will always happen, and heat (q) will spontaneously flow from a hot reservoir to a cold reservoir, as shown in Fig. 12.1. For heat (qc) to flow from a cold area to a warmer area, work (w) must be performed such that, according to the first law of thermodynamics, the total heat (qh) transferred is: