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Refrigeration Theory Midterm > 102b > Flashcards

102b Flashcards

1
Q

Pressure enthalpy diagrams show

A

Characteristics of refrigeration

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2
Q

Massive buildings and air conditioning systems use what cycle

A

Absorption cycle

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3
Q

Vapour compression (displacement) in refrigeration and air conditioning has two meanings

A

Positive displacement
Centrifugal displacement

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4
Q

Positive displacement example
(type of compressor)

A

Reciprocating compressor

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5
Q

A reciprocating compressor is a positive displacement compressor that uses

A

Cylinders and pistons for compression

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6
Q

A centrifugal compressor is

A

A non displacement compressor that moves vapors (no pistons)

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7
Q

Centrifugal compressors have what insides

A

Impeller wheels inside a chamber called a volute

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8
Q

Vapour pump/ compressor cycle examples are

A

Heat dispatch unit
Pressure reducer
Heat collector/evaporator

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9
Q

5 types of compressors

A

Reciprocating
Rotary
Scroll
Screw
Centrifugal

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10
Q

What two compressors have check valves

A

Rotary and scroll

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11
Q

Do all pressures stay the same after both sub cooling and superheating

A

Yes

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12
Q

What is a metering device

A

Pressure reducer

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13
Q

4 types of metering devices

A

Capillary tube
EEV (automatic TXV)
Small and large TXV
Fixed orifice

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14
Q

Energy due to motion is called

A

Kinetic energy

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15
Q

Two factors on the amount of energy an object can posses

A

Material
Physical size

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16
Q

Latent heat is

A

The heat added or removed to cause a state changes

17
Q

Superheating and sub cooling both require

A

Sensible heat

18
Q

Two types of Fluid flow are

A

Laminar and turbulent

19
Q

Laminar flow is

A

Smooth and in one orderly path

20
Q

Turbulent flow is

A

Rough and disorderly
Pressure loss

21
Q

Static fluid pressure is based on

A

Depth of a fluid

Refrigeration Theory Midterm (7 decks)

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