Lec 8 Flashcards
Application of Refrigeration and Cold Storage of Crops
- Preservation and storage of farm produce.
- Lengthen the storage period of grain seeds.
- Retains the freshness of newly caught fish and
preserve it prior to processing. - Provide proper ventilation for various farm
structures. - Provide a better environment for farm
houses and offices.
It has something to do with removing of heat so as to maintain the temperature of a
substance or space at a temperature lower than it is normally would be.
Refrigeration
It basically remove heat from an enclosed space and release the heat outside the space.
Refrigeration Systems
It is the agent which conducts the heat from the
refrigerated coils and releases it to the outside air.
Refrigerant
Sources of Refrigerants
Ammonia
Methyl chloride
Sulfur dioxide
Freons
Oldest and widely used for large installation
Ammonia
Commonly used for refrigeration system now a days.
Freons
Makes liquid to change to gas. To cause this, heat must be added to the refrigerant. ___ of refrigerant cools the surrounding area. The evaporator is located inside the refrigerated space (to pick up the heat).
Evaporation
It makes the gaseous refrigerant into liquid. Heat must be absorbed from the refrigerant in order to cause this. The cooler space subtracted heat from the refrigerant thereby causing ____. Condenser are located outside the refrigerated space (to release heat).
Condensation
It is the complete series of events occurring in order as the refrigerant travels the route.
Refrigeration Cycle
High pressure liquid escapes through the valve into low pressure pipe and refrigerant expands.
Expansion
Liquid refrigerant begins to evaporate and secures necessary heat from the air inside the refrigerated room.
Evaporation
Allows the refrigerant to give up the heat picked up from the refrigerated room by drawing it with the compressor.
Compression
High-pressure high temperature gaseous refrigerant is forced out by the compressor to the condenser.
Condensation
