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HVAR > Heating > Flashcards

Heating Flashcards

1
Q

3 States of Matter

A

Solid, Liquid, Vapor.

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2
Q

Sensible Heat

A

Is the amount of heat added to or removed from a substance causing a change in temperature measurable by thermometer.

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3
Q

Latent Heat

A

Is the amount of heat added to or removed from a substance causing a change in state, but not a change in temperature.

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4
Q

Specific Heat

A

Is the amount of heat added to or removed from a substance changing the temperature of the substance 1 degree F.

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5
Q

Water Specific Heats are

A

Ice (Solid) =.5 btu

Water (Solid) = 1 Btu

Steam Vapor = .5 btu

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6
Q

Heat of melting

A

Is the amount of latent heat added to a solid to cause the change of state to liquid

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7
Q

Heat of fusion

A

Is the amount of latent heat removed from a liquid causing a change of state to a solid.

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8
Q

Heat of vaporization

A

Is the amount of latent heat removed from a vapor causing a change of state to a vapor.

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9
Q

Sub-cooled liquid

A

Is a liquid cold below its saturated condition, and when sub cooled there is only liquid present

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10
Q

Super heated Vapor

A

A vapor heated above it’s saturated condition. When in a superheated condition there is only vapor present.

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11
Q

Saturated condition

A

This exists whenever liquid and vapor are present in the Sam container under the conditions. Since liquid and vapor must be present, saturated conditions only exists when vaporization or condensation is occurring.

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12
Q

Btu = British thermal unit

A

Is the amount of energy required to heat or cool one pound of water.

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13
Q

What is the Specific Heat of Air

A

.24 BTU

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14
Q

Enthalpy

A

Definition

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15
Q

Heat is in everything until:

A

Absolute 0 or (-460 degrees below 0 F) (-273 degrees below 0 C)

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16
Q

Fusion or melting

A

The process of braking away from other and changing from solid to liquid

17
Q

The heat required to break up mutual attraction of the molecules so that the material changes from a solid to a liquid is

A

Latent heat of melting or latent heat of fusion

18
Q

____________ heat of a solid is the heat that is added or removed to change the temperature of a solid.

A

Sensible

19
Q

Molecules in a solid are help together by

A

Cohesion

20
Q

Some molecules near the surface can brake away form a solid and become vapor. This is

A

Sublimation

Solid to a vapor

21
Q

Changing from a liquid to a vapor

A

Boiling

22
Q

Change for a liquid to a vapor

A

Evaporation

23
Q

Temp. Oxygen changes states

A

Liquid -297 Solid -361

24
Q

Vapor to water

A

Sensible heat of vapor is removed to 212 F.(still a vapor)

970 btu are removed to change to water. (Still 212 F)

Sensible heat is removed to make the water 32F. (Still water)

25
Q

Water to ice

A

Sensible temp is removed to 32f.

144 Btu are removed to change the state. (Temp is still 32f)

Sensible temp is removed below 32f to cool ice.

26
Q

Temp. With no heat

A
  • 40 f for air conditioning.
27
Q

Total heat of water

A

Sensible heat of ice -40f to 32f.

Latent heat of fusion of ice 32f.

The sensible heat of water 32f to 65f.

28
Q

To heat of steam at 400f

A

Sensible heat of ice from -40f to 32f.

Latent of fusion heat of ice to 32f.

The sensible heat of water 32f to 212f.

Latent heat of vaporization of water at 212f.

Sensible heat of stem 212f to 400f.

29
Q

Btu fomula

A

Number of pounds of water
X number of degrees the temperature is to be raised
———————————————————————
= the number of btu.

30
Q

Raising a material to a higher temperature

A

Multiply to pounds of the material by the degrees it is to be warmed.

Multiply this amount by the heat of that particular material.

31
Q

Latent heat of fusion: changing ice to wat

A

Multiply the weight of water by the latent heat of water (144 btu)

32
Q

Heat water to boiling

A

25 pounds(weight of water)
X. 180 degrees (change in temp from 32 to 212)
X. 1.0 (the specific heat of water)
————————
=. 4500 btu

33
Q

Changing water to water vapor (25 pounds of water)

A

Multiply the weight of water times the latent heat of vaporization for water.
25 pounds (weight of water)
X 907 btu (latent heat of water)
———————————————————
= 24,250 btu

HVAR (5 decks)

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