Engineering Homework Help

1) How long would it take to heat water from 30oF to 120 oFin a 40 gal, 5 kW water tank.

2)How much would be the final temperature if 1.0 kg of water at 20oC id heated by condensation of 30 g of steam at 100 oC.lv=3×106j/kg

cw=4.2×103j/kgc.

3)A student wants to cool 0.25 kg of water initially at 25 oC, by adding ice initially at –25oC. How much ice should be add so that final temperature will be 0oC .Lf=3.34×105j/kg

4)Please go to the http://www.sunposition.info/sunposition/spc/locations.php#1and get sun path data for your Birthday on your hometown. Take the sun path data to Excel and plot it.(BD=(April/22)

5)Please design the door overhang for maximum sun in winter and no sunin summer, chose the appropriate angel. Dec 21=30 deg

July 21=77deg

6) Explain briefly how to make cold.