Notes on Chapter 7 examples

Notes on Chapter 7 examples - CHAPTER SEVEN 7.1 0.80 L 35...

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7- 1 CHAPTER SEVEN 7.1 080 35 10 0 30 2 33 2 3 4 . . . . L kJ . kJ work 1 h 1 kW h L 1 kJ heat 3600 s 1 k J s kW kW u 2 1 312 3 3 .33 kW 10 W 1.341 10 hp kW 1 W hp .1 hp 3 u ± . 7.2 All kinetic energy dissipated by friction (a) E mu k u ± 2 2 2 2 2 4 2 2 2 5500 lb 5280 1 9 486 10 715 m 2 2 f 2 2 2 m 2 f 55 miles ft 1 h lb Btu 2 h 1 mile 3600 s 32.174 lb ft / s 0.7376 ft lb Btu . (b) 8 4 6 3 10 brakings 715 Btu 1 day 1 h 1 W 1 MW 2617 MW day braking 24 h 3600 s 9.486 10 Btu/s 10 W 3000 MW ± u u 7.3 (a) Emissions: Paper 1000 sacks oz 1 lb sack 16 oz lb m m ² ( . . ) . 0 0510 0 0516 6 41 Plastic 2000 sacks oz 1 lb sack 16 oz lb m m ² ( . . ) . 0 0045 0 0146 2 39 Energy: Paper 1000 sacks Btu sack Btu ² u ( ) . 724 905 163 10 6 Plastic 2000 sacks Btu sack Btu ² u ( ) . 185 464 130 10 6 (b) For paper (double for plastic) Raw Materials Acquisition and Production Sack Production and Use Disposal Materials for 400 sacks 1000 sacks 400 sacks
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7- 2 7.3 (cont’d) Emissions: Paper 400 sacks .0510 oz 1 lb sack 16 oz 1000 sacks .0516 oz 1 lb sack 16 oz lb reduction m m m ² 0 0 4 5 30% . Plastic 800 sacks .0045 oz 1 lb sack 16 oz 2000 sacks .0146 oz 1 lb sack 16 oz lb reduction m m m ² 0 0 2 05 14% .
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