Refrigeration Principles

Question 0

British thermal unit

Answer 0

A unit for measuring heat quantity equal approximately to the amount of heat produced by the burning of ordinary kitchen match. More specifically, it is the amount of heat required to raise the temperature of one pound of water one degree Fahrenheit. (12000-btu in 1 ton)

Question 1

Ambient air

Answer 1

The air surrounding any object

Question 2

Capillary tube

Answer 2

A small diameter tube ( metering device ), whose bore and length are designed to permit the passage of a specific amount of liquid refrigerant or other liquid at a specific pressure drop.

Question 3

Refrigerant charge

Answer 3

The amount of refrigerant in a system; to put in the refrigerant charge.

Question 4

Coil

Answer 4

A heating or cooling element made of pipe or tubing with or without extensions or fins

Question 5

Cooling coil

Answer 5

A term commonly used meaning the evaporator

Question 6

Compression

Answer 6

In a compression refrigeration system a process by which the pressure of the refrigerant is increased

Question 7

Compressor

Answer 7

A device for increasing the pressure I hear laden refrigerant vapors thus increasing the heat level ( super-heating) within those vapors so that the heat contained can be released into the outside atmosphere.

Question 8

Condensation

Answer 8

The process whereby a vapor is changed to a liquid by removal of heat after it’s dew point (condensation temp) is reached.

Question 9

Condenser

Answer 9

A vessel or arrangement of pipes or tubing, in which vapor is liquified by removal of heat.

Question 10

Condensing unit

Answer 10

A refrigeration machine consisting of one or more power driven compressors, condenser, liquid receivers and other components

Question 11

Conduction

Answer 11

The process of transferring heat along the elements of a substance as from a tube to a fin.

Question 12

Convection

Answer 12

The transfer of heat by the movement of fluid or air

Question 13

Refrigeration (mechanical) cycle

Answer 13

Complete cycle of refrigerant from a condensing unit (compressor-condenser) through a system of lines or tubing to the evaporator coil and back into the condensing unit; a cycle in which heat is absorbed in the evaporator and given up in the condenser

Question 14

Dehydrate

Answer 14

To remove water in all forms from other matter

Question 15

Dew point

Answer 15

The temp at which water vapor turns into liquid

Question 16

Drier

Answer 16

A device placed in refrigeration system to attract and destroy unwanted moisture which may be in a system.

Question 17

Evaporator

Answer 17

That part ( heat exchanger ) of a cooling system in which refrigeration is vaporized

Question 18

Expansion valve

Answer 18

A thermostatically controlled valve, or metering device for controlling the boiling point and flow or refrigerant to the cooling element ( evaporator ).

Question 19

High side

Answer 19

That part of the refrigeration system where refrigerant is under the greatest amount of pressure where heat is rejected (condenser section) . This is area of highest temperatures and highest pressures.

Question 20

Liquid line

Answer 20

The tube or piping carrying liquid refrigerant from the condenser or receiver of a refrigeration system to a pressure reducing device.

Question 21

Low side

Answer 21

Those parts of the refrigeration system where heat is absorbed at evaporator pressure; the cooling coil or evaporator with associated components; also commonly referred to as the suction side; this is the area of the lowest temperature And lowest pressures