Refrigeration

Question 1

What temperature is comfort cooling?

Answer 1

75 f

Question 2

medium temperatue refrigeration

Answer 2

35 f

Question 3

Walk in refrigerator usually operate in a range of ____°F to ____°F

Answer 3

35°F to 37°F

Question 4

walk-in freezers normally run at _______°F and reach-in freezer operate at about 0°F

Answer 4

• 10 °F

Question 5

r134a Is a single chemical refrigerant, known as an ________, which boils and condenses at a single pressure and temperature.

Answer 5

Azeotrope

Question 6

___________ are blends of different refrigerants.

Answer 6

zeotropes

Question 7

EPA

Answer 7

Environmental Protection Agency

Question 8

Warm air from the space is blown over the _________. Heat from the air is absorbed into the refrigerant as it boils within the ________ tubing.

E

Answer 8

Evaporator

Question 9

it rejects heat

Answer 9

Condenser

latent eat is relesed as the vapor condenses into lidquid within the con

Question 10

refrigerant temperature must be rised much higher. The ____ raises the temp by raising the pressure.

Answer 10

Comperssor

The compressor can raise the refrigerant
temperature by raising its pres

Question 11

Reduces the liquid pressure by forcing it through a nozzle or small opening.

Answer 11

Metering device

Lowering the pressure of the refrigerant allows it to boil
at a lower t

Question 12

What is considered the normal temperature of a walk-in refrigerator?

Answer 12

?38 °F - 40°F

Question 13

at what temperature does the refrigerant condense?

Answer 13

?115 °F

Question 14

R22 refrigerant at 49 psig boils at what temp?

Answer 14

?75 °F

Question 15

What is considered the normal temp of a reach in freezer?

Answer 15

35? °F - 37°F?

Question 16

how can the latent heat in a cold suction line be transfered to higher outdoor air temp?

Question 17

which refrigerant is used most in recently installed walk in refrigerations?

Answer 17

?

Question 18

why do zeotropic have temp glide?

Answer 18

?the component refrigerants boil off at different rates.

Question 19

which refrigerant is used mostly in recently installed reack in refrigerant?

?

Answer 19

?

Question 20

(TD)

Answer 20

Temperature Difference

Question 21

determining whether an evaporator has too much or too little refrigerant.

Answer 21

superheaat measurement

Question 22

the primary functionn of an evaporator is?

Answer 22

to absorb heat from the refrigerated space

Question 23

Secondary function of evaporator is to ?

Answer 23

to remove or maintain humidity in the space.

Question 24

evaporator temperature

Answer 24

refrigerant temperature inside the evaporator tubing.

Question 25

(p/t)

Answer 25

pressure / temperature

Question 26

td

Answer 26

temperature difference between the evaporator temperature and the temperature of the refrigerated space.

Question 27

delta t

Answer 27

as the difference between supply and returne air temperatures

Question 28

if a walk in cooler is running at 35 f box temperature, what should the evaporator temp be?

Answer 28

10 f lower than the box temp

Question 29

Heat always moves from a _________ surface to a _________ surface, a

Answer 29

warmer, cooler

Question 30

The warm air ________ and the cooler air falls.

Answer 30

rises,