The question is this: Suntech’s STP-275 polycrystalline solar panels generate 275 W under 1 kW/m^2 of insolation. They measure 77.0 x 39.1 inches. Monocrystalline OPT 275 panels from Suniva also generate 275W under 1 kW/m^2 insolation. They measure 65.35 x 38.98 inches. Calculate the efficiencies of the two panels in converting sunlight to electricity, assuming that their entire areas are covered with PV cells. How would I calculate the efficiency with the numbers given?

What is the cost of heating water in a swimming pool of radius 3.5 m and depth 1.3 m from 13 degress celcius to 27 degress Celcius. If the price of energy is $0.08/ KWh. The specific heat of water is 4186 J/Kg/Cdegrees and density of water is 1000 Kg/m^3. (Hint: Volume of cylinder is πr2h) A. $30.25 B. $65.15 C. $95.50 D. $25.25 E. $133

If the dew point of air (35°C and 1 atm) is 20 °C, what is the RH under that temperature and pressure (35°C and 1 atm)? What is the volume fraction?

A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of 40.0 cm and a length of 55.0 cm, and operates at a temperature of 410°F. (o = 5.6696 x 108 w/m2 . K, 1 Btu = 1054 J.) (a) If the temperature of the room is 70.0°F, determine the amount of radiant energy delivered to the room by the stove each second if the emissivity is 0.950. (b) If the room is a square with walls that are 8.00 ft high and 30.0 ft wide, determine the R-value needed in the walls and ceiling to maintain the inside temperature at 70.0°F if the outside temperature is 32.0°F. Note that we are ignoring any heat conveyed by the stove via convection and any energy lost through the walls (and windows!) via convection or radiation. ft2. oF . h/Btu

2kg of ice at 0 degree celsius are placed in a closed glass beaker( k = 0.80W/m-c). The closed beaker is then placed in a 30 degree celsius room The surface area of the beaker is 5x10-3 m² and its walls are 0.005m thick. How much heat is required to melt the ice? How long does it take the ice to melt?

The rate of heat transfer on a cold day in the Canada through a rectangular window is 2336 W. The temperature inside the home is 20.2 °C and the temperature outside the home is -7 °C. What is the area of the room if the thickness 6.7 mm and thermal conductivity value of 0.25 W/m/°C?

Calculate the total heat transfer from the 5.0 m² surface shown in the figure. Tur = 0°C h = 40 W/m²-K T = 180°C ɛ = 0.90 fluid T = 10°C insulated