hw01_answers - ENGRI 1290 HW01 Due 09/13/2010 Problem # 1...

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Unformatted text preview: ENGRI 1290 HW01 Due 09/13/2010 Problem # 1 We want to power a small town in Nevada using 10% efficient solar cells. We suppose the daily average solar power density is 23OW/m2. Every day, this town uses the amount of energy given below. 1. Transform the energy used by the town into J. 2. What is the power this town requires to function? 3. How much power density can be turned into electricity using this type of panel? 4. What isthe minimum area of solar panels needed to power this town? Problem # 1 (continued) The town uses 3OOMWh. ® Ekbwvx '1 300*‘06 Wlfl Since. BGOOS: 1L1 E‘powv‘ :1 gx‘oax W5 : ‘56X1O‘2’j <9 ‘wavx \JScs 300 “Wk {h $0 ? —_—, E500“ __ 3x\D& __ l}. bum 24““ —- ’27;— _. [338x10 LW @ svlnmd '3 8 S50“ W- &e C§§Q¢KC7 ezkog Problem # 2 We want to power a small coastal town in New Hampshire using 40% efficient wind turbines with an area given below. Every day, this town uses ISOMWh. We suppose all the energy extracted by the turbine from the wind is turned into electricity. The daily average wind velocity is Sm/s and its density is 1.2kg/m3. 1. Transform the energy used by the town into J. 2. What is the power this town requires to function? 3. How much power can be turned into electricity using this type of wind turbine? 4. How many turbines are necessary to power this town (give an integer number)? Problem # 2 (continued) The turbine area is 6,000m2. ® 559w“ ’7- lSOX\O€ W xgéoos :- 5.1+ XiOuJ @ CK) w“ —; E'rcww wwrt T [S Q‘Cme. okuer-g szu‘cl" ’- \ Hut. enerakf Ebwv‘ (S Coinsqu , Tc 7) m 2 1m : Q.?—leOG\/\/ @ 2.4L» Swimzi : J2: {3V3 (PM,th 2»; (WAVE )A [rucLnguma ii“ {M 2 999mm; 2 ZSZleOSw (p @ NhH‘Eihes 3 hpwn : brkiflfis Problem # 3 Water flows through a pipe with area 2m2 with a velocity given below. The pipe is connected to another cylindrical pipe with a 20 cm diameter. We suppose the water density is constant at 1,000kg/m3. 1. What is the cross-sectional area of the smaller pipe? 2. What is mass flow rate of water in the big pipe? 3. What is the volumetric flow rate of water in the big pipe? 4 . Using flow rate conservation, find the water velocity in the small pipe. Problem # 3 (continued) The water flows at 3m/s. @A2fiRQ—2TZQL? : %\ILPZ><\O MAL Small @ flu msbe’bw m‘l‘: Kn: ()ALQa/b‘f. \OOOxlx's @ Shae/e. two W33 (5 (OS? Edrween é’UJO e a ’- h . g "le “Alma; 3 W‘ska ‘ Eemug fiwahr - Cams‘mm Cam“?va J ALxgvb;g 2 Asmau \[SMOM 90 V5MatL '1 “Hg “ c: K“ wx/g ...
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hw01_answers - ENGRI 1290 HW01 Due 09/13/2010 Problem # 1...

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