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Flashcards in Energy Units Deck (32)
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1

What is energy?

The capacity to perform work

2

Joule (J)

Basic unit of thermal energy in the International System (SI)
1 Joule = 1 Watt-second

3

BTU

Basic unit of thermal energy in the English System
1 BTU = heat required to raise the temp of 1 lb of water by 1 degree F at sea level
1 BTU = 1055 Joules

4

MBTU

1000 BTU

5

MMBTU

1,000,000 BTU or 10^6

6

Quad

10^15 BTU
Huge amount - used to measure global energy

7

Watt-hour (Wh)

Standard unit of electrical energy
1 Wh = 1 watt used for 1 hour
kWh (1000), MWh, GWh, TWh

8

Nutritional Calorie

1.162 Watt-hours

9

What is power?

The rate at which something uses or produces energy. The average amount of energy something produces or consumes over a given period of time.
Power = Energy / Time

10

1 ton =

12,000 BTU/hour

11

1 Horsepower =

746 Watts

12

Watt (W)

Standard unit of electrical power

13

Power Units

BTU/hour (BTUh), MGH, tons, HP, Watts

14

1 ton = _____ BTU/hour

12,000 BTUh

15

1 Horsepower = ___ Watts

746 Watts (.746 kW)

16

What's always the common denominator for energy fuels?

BTU

17

1 kWh = ___ BTU

3,412 BTU

18

The energy contect of 1 Cubic Foot (cf or ft^3) of natural gas =

1,000 BTU

19

1 Therm =

100,000 BTU

20

The energy content of 1 Barrel of Crude Oil (42 gal) =

5,100,000 BTU

21

The energy content of 1 gallon of gasoline =

125,000 BTU

22

The energy content of 1 gallon of liquid propane gas (LPG) =

95,000 BTU

23

The energy content of 1 pound of coal =

11,000-14,000 BTU
Use the average of 12,500 BTU

24

The energy content of 1 ton of coal =

25,000,000 BTU

25

The energy content of 1 cord of wood (128 sq ft) =

Approx 30,000,000 BTU
It depends on the species

26

1 Cubic Foot of water =

7.48 gallons

27

1 Gallon of water =

8.33 pounds

28

Energy Efficiency =

Energy Output / Energy Input

29

Overall Efficiency =

Eff 1 x Eff 2 x Eff 3 ...

30

Heat rate =

BTUs / kWh produced