Industrial refrigeration A Flashcards

1
Q

refrigerant in screw compressor

A

propane

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2
Q

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

A

ammonia

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3
Q

heat transfer through physical contact of the molecules to substance

A

conduction

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4
Q

heat transfer by moving matter

A

convection

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5
Q

heat transfer by electromagnetic waaves

A

radiation

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6
Q

matter is packed close together and vibrate slowly

A

solid

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7
Q

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

A

liquid

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8
Q

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

A

gas

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9
Q

heat cannot be measured with a thermometer

A

latent heat

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10
Q

heat can be measured with a thermometer

A

sensible heat

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11
Q

energy that is in motion doing work

A

kinetic

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12
Q

energy is at rest and is capable of doing work

A

potential

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13
Q

high pressure side of refrigeration system

A

compressor, condenser, metering device

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14
Q

low pressure side of refrigeration system

A

metering device, evaporator, compressor

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15
Q

refrigeration cycle

A

compress, condense, expand, evaporates

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16
Q

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

A

superheating

17
Q

the removal of heat from a superheated vapor

A

desuperheating

18
Q

the removal of heat from a saturated liquid

A

subcooling

19
Q

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

A

evaporator

20
Q

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

A

compressor

21
Q

device that rejects heat from the circuit

A

condensor

22
Q

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

A

metering device

23
Q

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

A

wet bulb temperature

24
Q

what happens to high pressure liquids when pressure is reduced

A

expands

25
Q

solution to lower the freezing point of water

A

brine (calcium chloride and water)

26
Q

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

A

suction line

27
Q

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

A

discharge line

28
Q

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

A

condensate drain line

29
Q

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

A

liquid line

30
Q

piping for ac and refrigeration system

A

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

31
Q

equipment for ammonia and propane system

A

steel pipe

felt filter

32
Q

newly assembled system pressure test

A

nitrogen at 150 PSIG for 4 hours