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Heating 102JK > 102 K > Flashcards

102 K Flashcards

(54 cards)

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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

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A

BTU consumed by the burners(what goes out)

23
Q

Output rating meaning

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A

Amount of useable heat from the combustion process (what enters

24
Q

Specific heat of water

25
Specific heat of steam
0.46
26
Specific heat of ice
0.5
27
How to get time
BTU available ——————— = time Appliance input
28
Ignition temperature for propane gas
950F
29
Ignition temperature Natural gas
1200F
30
What’s the hottest part of a flame
The tip of the inner core
31
Natural gas maximum flame temperature
3350F
32
Propane gas maximum flame temperature
3500F
33
What is flame speed
The Speed that a gas will flame will burn back along a stationary column
34
Natural gas flame speed
26 inches/second
35
Propane gas flame speed
32 inches/second
36
What’s lift off
When the gas moves faster the the flame speed
37
What is flashback
When the gas moves slower than the flame speed
38
What is range of flammability
Percentage of gas in an air/gas mixture between the upper and lower limits of flammability
39
Natural gas range of flammability
5 to 15%
40
Propane gas flammability
2.3 to 9.5%
41
3 things needed to start a fire
Heat Fuel Oxygen
42
Products of complete combustion
Nitrogen Water vapor Carbon dioxide
43
Combustion air required
The theoretical volume of air required to burn the gas completely
44
Natural gas combustion volume of air required (ft3)
10 ft3
45
Propane combustion air required
24ft3
46
Additional air is added to Complete combustion this air is called
Excess air and it’s about 40% of total
47
Do you want the flame to be as blue as possible on tourch
Yes
48
Incomplete combustion is when
Not enough air is supplied
49
What is produced during incomplete combustion
Carbon monoxide
50
The odors coming from incomplete combustion are called
Aldehydes
51
Percent of carbon monoxide in air that we can breath for 8 hours
50 parts per million 0.005 percent
52
Properties of natural gas
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
Properties of propane
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
Define BTU
The ability to raise the temperature of 1lbs of water by 1°F

Heating 102JK (2 decks)

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