The Refrigeration Cycle

Prior to mechanical refrigeration, the ice for the icebox was harvested from lakes and ponds.

• true

• false

The icebox cooled food down by natural __ .

• conduction

• convection

• radiation

Hot air ___, cool air ___.

• falls, rises

• stagnates, drops

• rises, falls

• drops, stagnates

Refrigerant is a fluid that evaporates at low temperature and pressure; and condenses at a higher temperature and pressure.

• true

• false

Refrigerant in a close system does not wear out or is used up in the system. The only way it can be lost is if there is a leak.

• true

• false

The refrigeration cycle is a thermal dynamic sequence where refrigerant .... (select the two answers that apply)

• rejects heat at a relatively low temperature

• absorbs heat at a relatively low temperature

• absorbs heat at a much higher temperature

• rejects heat at a much higher temperature

In a vapor compression cycle, low temperature, low pressure, and slightly superheated vapor enters the ___ .

• metering device

• evaporator

• compressor

• condenser

In a vapor compression cycle, refrigerant that is high temperature, high pressure, and very highly superheated enters the ___ .

• metering device

• evaporator

• compressor

• condenser

In a vapor compression cycle, refrigerant that is high temperature, high pressure, and very highly superheated travels in the ___ .

• suction line

• liquid line

• discharge line / hot gas line

In the condenser, the refrigerant goes through which of the following phases? Check all that apply.

• de-superheated by removing sensible heat

• saturated gas gives up its latent heat and changes state from vapor to liquid

• liquid is subcooled by removing the sensible heat