FDSC 310 Lecture Notes - Lecture 6: Temperature Measurement, Dehumidifier, Thermoelectric Cooling
10 Oct 2017
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Document Summary
Ice as a source of refrigeration referred to as ice-refrigeration, storage of ice in insulated chamber, melting ice absorb heat from food. Cold air is heavier than warm air, therefore the ice chest is placed above the produce to permit natural convection. Mechanical refrigeration refrigeration system absorbs heat in the cooling chamber (which is at lower temperature) releases it outside (which is at higher temperature). Heat is transferred from cold to hot room, trick of refrigerant. Mechanical refrigerationthe refrigerant absorbs heat in the cold room. In the chamber the cooling coil will be at lower temperature than the food, and hence the refrigerant can absorb heat naturally. Outside the refrigerant will be warmer than the surrounding air and hence it can give up heat. When compressed, its temperature is increased. compressed gas also has a higher boiling point. Compressed liquid when allowed to decompress results in cooling, has lower boiling point and remains a gas.
