Unit 21 Flashcards (QUIZ) (CRF)-Mr. Graham

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

• Boiling Temperature

• Film Factor

• Saturated Vapor

• Starved Coil

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 exchanger.

• Bearing Washout

• Film Factor

• Wet Compression

• Starved Coil

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

• Film Factor

• Flooded Evaporators

• Starved Coil

• Stamped Evaporator

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

• Flooded Evaporators

• Finned Tube Evaporator

• Starved Coil

• Bearing Washout

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

• Subcooling

• Flooded Evaporators

• Superheat

• Finned Tubed Evaporator

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

• Saturated vapor
• Superheated vapor
• Saturated liquid
• Liquid refrigerant

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.

• Finned tube evaporator

• Condenser coil
• Radiator core
• Heat sink

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.

• Bearing washout

• Compressor overheating due to lack of airflow.
• Liquid refrigerant evaporating before reaching the crankcase.
• Excess lubrication from compressor oil leaking out.

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

• Boiling temperature

• Wet compression

• Starved coil

• Flooded evaporators

The process of removing heat from a place where it is not wanted and transferring that heat to a place where it make little or no difference is known as__________

• refrigeration
• ventilation
• heating
• insulation