# Lesson 5.ppt - Lecture 5 CHAPTER 4 ENERGY BALANCES Energy...

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ENERGY BALANCES Energy flow in – energy flow out + energy created – energy destroyed = accumulation Energy cannot be created nor destroyed, only transformed – 1 st law of thermodynamic Energy accumulation = energy flow in – energy flow out Potential energy per unit mass (pe) Kinetic Energy per unit mass (ke) Internal energy per unit mass (u) U = mu or u = U/m Specific energy CHAPTER 4 Lecture 5

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Power Units Energy 1 J = 1 W for 1 s 1 W 1 kW=10 3 W 1 MW=10 6 W 1 TW=10 12 W 1 GW=10 9 W Nathan S. Lewis, California Institute of Technology
Prefix Symbol(s) Power of 10 yocto- y 10 -24 * zepto- z 10 -21 * atto- a 10 -18 * femto- f 10 -15 * pico- p 10 -12 * nano- n 10 -9 * micro- m 10 -6 * milli- m 10 -3 * centi- c 10 -2 * deci- d 10 -1 * (none) -- 10 0 deka- D 10 1 * hecto- h 10 2 * kilo- k 10 3 mega- M 10 6 giga- G 10 9 tera- T 10 12 peta- P 10 15 exa- E 10 18 * zetta- Z 10 21 * yotta- Y 10 24 * Multipliers Annual global power demand- approx. 15 TW Q: Convert 15 TW power in EJ energy. BTU: British thermal unit – equivalent to 1055 joules Q: Convert 15 TW power in BTU units and quadrillion BTU.

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1 Quad- 10 15 BTU or 1.055 x 10
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