01. ACR-104 UNIT 21 FLASH CARDS

Front

boiling temperature

Back

The boiling temperature of the liquid can be controlled by controlling the pressure. The standard boiling pressure for water is an atmospheric pressure of 29.92 in. Hg (mercury) where water boils at 212F°.

Front

stamped evaporator

Back

An evaporator that has stamped refrigerant passages in sheet steel or aluminum.

Front

film factor

Back

The relationship between the medium giving up heat and the heat exchange surface (evaporator). This relates to the velocity of the medium passing over the evaporator. When the velocity is too slow, the film between the air and the evaporator becomes greater and becomes an insulator, which slows the heat exchange.

Front

finned-tube evaporator

Back

A copper or aluminum tube that has fins, usually made of aluminum, pressed onto the copper lines to extend the surface area of the tubes.

Front

saturated vapor

Back

The refrigerant when all of the liquid has just changed to a vapor.

Front

flooded evaporators

Back

A refrigeration system operated with the liquid refrigerant level very close to the outlet of the evaporator coil for improved heat exchange.

Front

starved coil

Back

The condition in an evaporator when the metering device is not feeding enough refrigerant to the evaporator.

Front

bearing washout

Back

A cleaning of the compressor’s bearing surfaces, which causes lack of lubrication. It is usually caused by liquid refrigerant mixing with the compressor’s crankcase oil due to liquid floodback or migration.

Front

wet compression

Back

Saturated refrigerant vapors being compressed by the compressor, which will turn into liquid refrigerant droplets when compressed.