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Heating 102JK > 102 K > Flashcards

102 K Flashcards

1
Q

Methane chemical formula

A

CH4

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2
Q

Propane chemical formula

A

C3H8

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3
Q

Butane Chemical formula

A

C4H10

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4
Q

4 states of matter

A

Solid, liquid, gas, plasma

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5
Q

What two factors influence state

A

Pressure and temperature

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6
Q

Propane boiling point

A

-44F

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7
Q

Methane boiling point

A

-258F

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8
Q

When propane is boiled it expands

A

270 times out of

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9
Q

What’s the relationship between volume and the weight of an object called

A

Density

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10
Q

Specific gravity

A

How many times the liquid is heavier than water

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11
Q

Specific gravity of propane

A

1.5

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12
Q

Specific gravity of natural gas(methane)

A

0.6

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13
Q

Does gas have stored energy

A

Yes

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14
Q

BTU/cubic feet of methane gas

A

1000

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15
Q

BTU/cubic feet of propane gas

A

2500

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16
Q

Calorific value

A

The CV of liquid petroleum gases are expressed as BTU per imperial gallon of liquid

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17
Q

How much more energy does propane release than natural gas

A

2.5 times out of

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18
Q

Two types of gas used in province

A

Natural gas (methane)
Propane

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19
Q

Can you switch fuels at home from one to another

A

Yes

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20
Q

1 gallon of water is equal to how many pounds

A

1gallon = 10lbs

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21
Q

How to calculate appliance efficiency

A

Output of the appliance
————————————
Input of the appliance

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22
Q

What is input rating

A

BTU consumed by the burners(what goes out)

23
Q

Output rating meaning

A

Amount of useable heat from the combustion process (what enters

24
Q

Specific heat of water

A

1.00

25
Q

Specific heat of steam

A

0.46

26
Q

Specific heat of ice

A

0.5

27
Q

How to get time

A

BTU available
——————— = time
Appliance input

28
Q

Ignition temperature for propane gas

A

950F

29
Q

Ignition temperature Natural gas

A

1200F

30
Q

What’s the hottest part of a flame

A

The tip of the inner core

31
Q

Natural gas maximum flame temperature

A

3350F

32
Q

Propane gas maximum flame temperature

A

3500F

33
Q

What is flame speed

A

The Speed that a gas will flame will burn back along a stationary column

34
Q

Natural gas flame speed

A

26 inches/second

35
Q

Propane gas flame speed

A

32 inches/second

36
Q

What’s lift off

A

When the gas moves faster the the flame speed

37
Q

What is flashback

A

When the gas moves slower than the flame speed

38
Q

What is range of flammability

A

Percentage of gas in an air/gas mixture between the upper and lower limits of flammability

39
Q

Natural gas range of flammability

A

5 to 15%

40
Q

Propane gas flammability

A

2.3 to 9.5%

41
Q

3 things needed to start a fire

A

Heat
Fuel
Oxygen

42
Q

Products of complete combustion

A

Nitrogen
Water vapor
Carbon dioxide

43
Q

Combustion air required

A

The theoretical volume of air required to burn the gas completely

44
Q

Natural gas combustion volume of air required (ft3)

A

10 ft3

45
Q

Propane combustion air required

A

24ft3

46
Q

Additional air is added to Complete combustion this air is called

A

Excess air and it’s about 40% of total

47
Q

Do you want the flame to be as blue as possible on tourch

A

Yes

48
Q

Incomplete combustion is when

A

Not enough air is supplied

49
Q

What is produced during incomplete combustion

A

Carbon monoxide

50
Q

The odors coming from incomplete combustion are called

A

Aldehydes

51
Q

Percent of carbon monoxide in air that we can breath for 8 hours

A

50 parts per million
0.005 percent

52
Q

Properties of natural gas

A

CH4
Specific gravity: 0.6
Calorific value(BTU/ft3) : 1000
Boiling point: -258
Range of flammability: 5-15%
Ignition temperature: 1200F
Flame temperature: 3350F
Combustion air required(ft3air/ft3gas): 10

53
Q

Properties of propane

A

C3H8
Specific gravity: 1.5
Calorific value(BTU/ft3) : 2500
Boiling point: -44
Range of flammability: 2.3-9.5%
Ignition temperature: 950F
Flame temperature: 3500F
Combustion air required(ft3air/ft3gas): 24

54
Q

Define BTU

A

The ability to raise the temperature of 1lbs of water by 1°F

Heating 102JK (2 decks)

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