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HVAC > Part 2 > Flashcards

Part 2 Flashcards

1
Q

Revolvers tank should not be filled beyond

A

80%

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2
Q

High pressure terms

A

High Side,” “Head Pressure” and “Discharge
Pressure”

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3
Q

Low pressure terms

A

Suction Temperature,” “Evaporator Temperature”
and “Saturated Suction Temperature”

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4
Q

Low side gauge reads

A

Reads suction pressure
• Reads suction temperature
• Reads vacuum

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5
Q

High side gauge

A

Reads condensing pressure
• Reads condensing temperatur

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6
Q

Saturated” refrigerant:

A

A mixture of liquid and vapor at the same time
– It has a pressure / temperature relationship

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7
Q

If you know the suction pressure

A

You can find the refrigerant’s evaporating temperatur

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8
Q

If you know the head pressure,

A

You can find the refrigerant’s condensing temperatur

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9
Q

Temp

A

Intensity of heat in degrees

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10
Q

Quantity

A

Amount of heat in BTU

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11
Q

Sensible Heat

A

Change in temp

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12
Q

Latent Heat

A

Change in state

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13
Q

Water raises…

A

Raises I lb per 1F

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14
Q

Ice raises

A

1 lb per 2F, specific heat of 0.5

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15
Q

144 Btu will change 1 lb of 32°ice

A

To 32* water

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16
Q

Heat of fusion

A

Is required to change ice to water

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17
Q

Sensible heat is measured with

A

Thermometer

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18
Q
A

1 Btu raises 1 lb water 1°F

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19
Q

Getting vapor back to a liquid

A

Latent heat must be removed from the vapor

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20
Q

The outdoor air cools hot refrigerant Vapor

A

The heat is absorbed by the cooler air

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21
Q

If vapor is cooled to it’s condensing temperature

A

Vapor condenses to a liquid

22
Q

Below it’s boiling point?

A

Subcooled-liquid only

23
Q

Boiling point

A

Saturated, part liquid part vapor

24
Q

Above boiling point

A

Superheat - Vapor only

25
Q

Matter

A

Solid gas and liquid ,

Space and has mass

26
Q

Blocks of ice exerts force

A

Downwards

27
Q

Liquid exerts force

A

Outward and down

28
Q

Gases push…

A

In all directions

29
Q

Weight

A

Is the force that the matter of an object exerts on a surface

30
Q

Density

A

Mass to volume relationship

31
Q

Boules Law

A

Relates pressure and volume

32
Q

Charles law

A

Pressure and temp

33
Q

Law of perfect gas

A

Pressure volume and temp

34
Q

Dalton’s law

A

Relates pressure of gases in a mixture

35
Q

Air expands when

A

Heated

36
Q

Dalton’s law of preffect pressure

A

The perfect pressure is the sumof inidual pressure of gas

37
Q

Absolute pressure in a cylinder double…

A

When the volume reduces by half

38
Q

High temperature: air conditioning

A

Comfort

39
Q

Medium temp;

A

fresh food preservation

40
Q

Low temp

A

Frozen foods

41
Q

Cooler air falls out because it’s heavier replaced by

A

Hot air

42
Q

Refrigeration

A

Process of replacing heat from a place where is objectionable to where it makes little or no difference

43
Q

Heat is pumped from a cold box

A

To a warm room

44
Q

Water boils at 250°F if pressure is increased

A

If increases to 15psig

45
Q

Water boils at 40°F if pressure is reduced to

A

0.248HG

46
Q

Saturation temperature:

A

point at which the addition
or removal of heat will result in a change of state

47
Q

Refrigerants

A

Refrigerants are substances that boil at low
pressures and temperatures and condense at high
pressures/temperatures

48
Q

Evaporator

A

Absorbs heat to be cooled

49
Q

Compressor

A

creates pressure difference needed to
facilitate refrigerant flow through the system

50
Q

Condenser

A

Rejects systems heat

HVAC (16 decks)

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