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A rooftop solar hot water heater with collector areas of 8 m2 and storage of 640 L is installed in Phoenix, Arizona on a house that uses 160 L/day of hot water at 60°C. 70% of the total energy required is supplied by solar energy (the solar fraction is 70%), and 30% is supplemented with an electric heater. The solar system costs $3,000 installed, whereas an electric water heater and tank for the same supply costs $800 installed. Assuming that the electricity cost is $0.10/kW-hr and does not change over time, estimate the simple payback time for the solar hot water heater. The temperature of the water in the main from which it is to be heated is 10°C.
based on inernal energy considerations what dislocation density in cu is needed to make the crystalline form of cu
hot water flows through a pvc k.092 wmk pipe whose inner diameter is 2 cm and outer is 2.5 cm. the temperature of the
Fluid is moving between two plates the top plate is moving with a velocity V, the distance between the plates is h, and the flow is completely horizontal; select the appropriate boundary condition of the viscous flow.
1000 ft3min of air at 50 degrees fahrenheit dry-bulb and 95 relative humidity are mixed with 1500 ft3min of air at 76
one kilogram butane c4h10 of is burned with 25 kg of air which is at 35 degree celcius and 100 kpa. assuming the
the wear resistance of a steel shaft is to be improved by nitrogen hardening of its surface. the initial nitrogen
The hull of a boat has a volume of 150 m3, and the total mass of the boat when empty is 8560 kg. Determine how much load this boat can carry without sinking (a) in a lake and (b) in seawater with specific gravity of 1.03.
a strip of metal is 250 mm long. it is stretched in two steps first to 300 mm and then nbspto 400 mm. show that the
a. calculate the density of air in lbmft3 at standard conditions 75f and 14.7 psia assume m 28.9 lbmlb-mol.b.
235u is bombarded with 0.025 ev neutrons. the result of the fissioning of the 235u are 4 neutrons ke 1 mev per neutron
one kmol of ideal gas cp30 jmolk is contained in a piston cylinder initially at 25c and 10bar. the mass of the piston
cylinder conditions at the start of compression in an si engine operating at wot on an air-standard otto cycle are 60
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