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9 Cards in this Set
- Front
- Back
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Four major components to a mechanical refrigeration system. |
Expansion device, Evaporator, Compressor, Condenser |
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Expansion device |
A. Separation of high side and low side of system.
B. Meters proper amount of liquid to evaporator. Flash gas occurs due to the expansion of liquid into a vapor. |
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Evaporator |
Its purpose is to absorb heat from the media being cooled, air. Heat energy moves into the liquid ammonia bringing it to its saturation point and changing its state into vapor. Heat continues to be absorbed into the vapor which is now slightly superheated. |
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Compressor |
1. Controls the suction pressure within the evaporator. 2. To increase the pressure and temperature of the refrigerant by compression. 3. Moves the vapor to the condensor. |
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Condenser |
Is to provide a place where the heat energy in the refrigerant, Evaporator and compression heat, is to be rejected or moved out of the vapor. This will allow the vapor to cool or "de-superheat" to its saturation point and change back to liquid. The temperature of the vapor must be higher than the temperature of the cooling media in order for Latent heat of condensation to occur. |
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Liquid intrusion into a compressor |
Slugging |
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Refrigeration defined as |
The process of removing heat from a place that its not wanted and moving it to a place where it does no harm. |
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Compression ratio formula |
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Specific volume |
Refrigerant vapors at different pressures occupy different volumes per unit weight. Important when calculating system capacity. |
