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C-20 > Theory of heat > Flashcards

Theory of heat Flashcards

1
Q

Standard atmospheric conditions

A

29.92” Hg on barometer(14.696 psia)

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2
Q

Lowest temperature in °F

A

-460°F(absolute 0)

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3
Q

Fahrenheit to Celsius

A

°F= (1.8x °C) + 32°

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4
Q

°C to °F

A

°C= (°F-32°) \ 1.8

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5
Q

Absolute temperature scales

A

°F= Rankine= -460°F
°C= Kelvin= -273°F

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6
Q

British Thermal Unit (BTU)

A

Heat content of a substance

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7
Q

Specific Heat

A

The amount of heat necessary to to raise the temperature of a substance 1°F per pound.

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8
Q

Specific Heat of water

A

1BTU/Lb

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9
Q

Specific heat of ice and steam

A

.5 BTU/Lb

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10
Q

Conduction

A

Energy actually moving from one molecule to another. (A stick in a fire)

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11
Q

Convection

A

Moves heat from one location to another by means of a fluid medium.
Ex. Furnace use blower to pass air over a heat exchanger and then to rooms.

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12
Q

Sensible Heat

A

When a change of temperature can be registered, heat intensity has changed.

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13
Q

Latent Heat

A

When heat is added but no temperature rise occurs. (Hidden heat)

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14
Q

Latent heat of vaporization

A

The amount of heat energy in BTU/lb required to change a substance into vapor.

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15
Q

Latent heat of vaporization of water

A

970btu/lb

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16
Q

Latent heat of condensation

A

The amount of heat energy in btu/lb required to be removed to change a vapor into a liquid.

17
Q

Latent heat of condensation of water

A

970btu/lb

18
Q

Latent heat of fusion

A

The amount of heat energy required to change a solid into liquid or liquid into solid.

19
Q

Latent fusion of water

A

144btu/lb

20
Q

Saturated liquid

A

When a liquid has reached its saturated temperature, where it contains as much heat as it can without boiling.

21
Q

Superheat

A

Difference between actual temperature of a vapor and it’s saturation point.

22
Q

Pressure

A

Force per unit of area

23
Q

PSI

A

Pounds per square inch

24
Q

Lb/ft3 of water

A

62.4 lb/ft3

25
Q

Atmospheric weight

A

14.696 psi

26
Q

Barometer

A

Measures atmospheric pressure.
36” tube filled with mercury placed upside down in a puddle of mercury.

27
Q

Atmospheric pressure on barometer

A

On a barometer the tube filled with mercury will fall to to 29.92” Hg.

28
Q

Atmospheric “Hg to psi

A

29.92”Hg=14.696 psi

29
Q

Atmospheric “hg fall with altitude change

A

1” per 1000ft change in altitude.

30
Q

1psi to “Hg

A

1psi= 2.036”Hg

31
Q

Absolute pressure conversion

A

PSIg + 14.696

Ex 50psig- 50psig + 14.696= 64.696psia

C-20 (3 decks)

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