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Refrigeration > Lesson 4 > Flashcards

Lesson 4 Flashcards

1
Q

it is the heart of the refrigeration system. Only a major component that has moving parts

A

Compressor

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2
Q

Increase pressure by displacing fluid in a shrinking volume.

A

Positive displacement pressure

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3
Q

High velocity impeller and belongs to turbomachinery class

A

Centrifugal compressors

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4
Q

Rolling piston and rotary sliding vane

A

Rotary compressors

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5
Q

Reciprocating ( welded hermetic)

A

Household refrigerator and freezer

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6
Q

Reciprocating (Open)

A

Residential and commercial Ac Hp

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7
Q

Rotary vane

A

Appliances and residential

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8
Q

Rotary scroll

A

Residential and commercial

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9
Q

Rotary screw

A

Industrial and commercial

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10
Q

Centrifugal

A

Industrial and commercial

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11
Q

Welded steel shell houses both compressor and motor

A

Hermetic

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12
Q

Common, but bolted, housing for compressor and motor. Can be opened and serviced

A

Semi-hermetic

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13
Q

Motor external shell, largest capacities , shaft seal necessary

A

Open drive

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14
Q

EER

A

Energy Efficiency Ratio

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15
Q

SEER

A

Seasonal Energy Efficiency Ratio

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16
Q

Instantaneous measure of performance

A

COP

17
Q

Often expressed as Kw/ton of cooling (or heating)

A

Compressor power

18
Q

Depends on compressor type, condenser size and TXV

A

SEER

19
Q

Necessary component in all vapor compression systems

A

Compressor oil

20
Q

Ability of oil to mix and move with refrigerant

A

Miscibility

21
Q

Measure of oil’s flow resistance

A

Viscosity

22
Q

Oil must sustain very high electrical voltage

A

Dielectric strength

23
Q

Oil’s ability to prevent chemical reactions

A

Chemical stability

24
Q

A tendency for refrigeration oils to absorb moisture from the atmosphere

A

Hygroscopic

25
Q

A refrigerant compressor operated with an inverter

A

Inverter Compressor

Refrigeration (1 decks)

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