Industrial refrigeration A

Question 1

refrigerant in screw compressor

Answer 1

propane

Question 2

liquified overfeed systems in meat packing plants use screw compressor. the refrigerant used

Answer 2

ammonia

Question 3

heat transfer through physical contact of the molecules to substance

Answer 3

conduction

Question 4

heat transfer by moving matter

Answer 4

convection

Question 5

heat transfer by electromagnetic waaves

Answer 5

radiation

Question 6

matter is packed close together and vibrate slowly

Answer 6

solid

Question 7

matter with molecules further apart and slide over one another and vibrate faster

Answer 7

liquid

Question 8

matter with molecules farthest apart they sly away from each other and vibrate quite rapidly

Answer 8

gas

Question 9

heat cannot be measured with a thermometer

Answer 9

latent heat

Question 10

heat can be measured with a thermometer

Answer 10

sensible heat

Question 11

energy that is in motion doing work

Answer 11

kinetic

Question 12

energy is at rest and is capable of doing work

Answer 12

potential

Question 13

high pressure side of refrigeration system

Answer 13

compressor, condenser, metering device

Question 14

low pressure side of refrigeration system

Answer 14

metering device, evaporator, compressor

Question 15

refrigeration cycle

Answer 15

compress, condense, expand, evaporates

Question 16

the addition of heat to a vapour, which elevates the temperature higher than the boiling point

Answer 16

superheating

Question 17

the removal of heat from a superheated vapor

Answer 17

desuperheating

Question 18

the removal of heat from a saturated liquid

Answer 18

subcooling

Question 19

absorbs heat from the refrigerated space and serves the overall function of heat transfer, considered the cooling function

Answer 19

evaporator

Question 20

the device that uses mechanical energy to circulate refrigerant and to maintain a low pressure in the evaporator, while maintaining a high pressure in the condenser

Answer 20

compressor

Question 21

device that rejects heat from the circuit

Answer 21

condensor

Question 22

device that throttles and regulates the flow of refrigerant and maintains the pressure difference between the evaporator and the condenser

Answer 22

metering device

Question 23

the temperature which water can be lowered by evaporating some of the water

Answer 23

wet bulb temperature

Question 24

what happens to high pressure liquids when pressure is reduced

Answer 24

expands

Question 25

solution to lower the freezing point of water

Answer 25

brine (calcium chloride and water)

Question 26

piping that connects the evaporator to the compressor and conveys a cool low pressure vapour

Answer 26

suction line

Question 27

piping that connects the compressor to the condenser and conveys a hot high pressure vapors

Answer 27

discharge line

Question 28

piping that connects the condenser to the receiver and conveys a high pressure liquid refrigerant

Answer 28

condensate drain line

Question 29

piping that connects the receiver to the metering device and conveys a high pressure(subcooled) liquid

Answer 29

liquid line

Question 30

piping for ac and refrigeration system

Answer 30

ACR copper pipe, cleaned, degreased, seal and nitrogen charged

Question 31

equipment for ammonia and propane system

Answer 31

steel pipe

felt filter

Question 32

newly assembled system pressure test

Answer 32

nitrogen at 150 PSIG for 4 hours