Air conditioning Unit 3

Heat flows through the insulated walls, Heat enters when the door is opened, Heat enters when warm food is placed in the icebox.

Ice melts in iceboxes because

False

If a cylinder of R22 is moved from a 100F truck body into an 80F shop, the quantity of liquid refrigerant in the cylinder will remain the same.

True

Modern refrigerators have become state of the art appliances and some models even include automatic beverage and ice dispensers, built in television screens and connections to the World Wide Web.

True

Only liquid refrigerant should enter the metering device

the process of removing heat from a place where it is not wanted to a place where it makes little or no difference

Refrigeration can be described as

metering device

The 4 major components of a vapor compression refrigeration system are the compressor, condenser, evaporator, and blank.

condenser and evaporator

The blank are used to change the bapor to a liquid and the liquid form back into a vapor the refrigeration cycle

centrifugal

The blank is referred to as a kinetic displacement compressor.

True

The boiling point of a refrigerant should be low enough at atmospheric pressure to keep the system pressure above 0 psig when operating at low temperatures.

pumps the refrigerant throughout the system

The compressor in a refrigeration system

rejects the heat from the refrigerant

The condenser

True

The discharge gas from the compressor is a high pressure, high temperature, super-heated vapor.

True

The evaporator can be thought of as a "heat sponge."

True

The evaporator in a refrigeration system must bbe colder than the refrigerated space in order to absorb heat.

True

The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.

will not be released into the atmosphere, may be used again, may be reclaimed for future use

The law requires technicians to recover refrigerant from all refrigeration systems so that they

False

The only location where the refrigerant vapor is super-heated is in the evaporator.

suction line

The refrigerant vapor picks up additional heat as it flows from the evaporator to the compressor. The heat is picked up from the blank

35 degrees F

The temperature inside the refrigerator fresh food section should be about

False

Vapor is more dense than liquid an, as the liquid refrigerant boils, it has a tendency to sink.

low pressure low temperature super heated vapor, high pressure high temperature super heated vapor

When a refrigerant enters the compressor, it is a blank and when it leaves the compressor, it is a blank.

R502

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

Meter device

a valve or small fixed sized tubing or orifice that meters liquid refrigerant into the evaporator

Compressor

is the heart of the refrigeration system.

Condenser

rejects both sensible and latent heat from the refrigeration system