A typical temperature coefficient of monocrystalline solar panel (300 W) rated at 25o C is -0.5%/o C. The rooftop solar panel power delivery at 65o C is
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A typical temperature coefficient of monocrystalline solar panel (300 W) rated at 25o C is -0.5%/o C. The rooftop solar panel power delivery at 65o C is
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- How to Solve this, A stainless steel plate at 100◦C faces a firebrick wall at 500◦C.Esti- mate the heat flux and radiation heat transfer coefficient, hTwo inches of urethane foam will reduce heat loss close to 1000% when applied to a 2-inch diameter uninsulated steel pipe. Assume the pipe wall thickness is 0.25-inches, the pipe interior convective heat loss (hi) is 500 BTU/hr-ft2-oF, and the pipe outside convective heat loss ho 20 BTU/hr-ft2-oF, k steel is 25 BTU/hr-ft-oF, and k insulaton is 0.023 BTU/hr-ft-oF. (hint - calculate heat loss with and without insulation.Estimate how much collector area and storage capacity would be required for an active solar hot-water system designed to supply the total needs for two four-person families, one living in Manchester, New Hampshire, where the latitude is 44+°N, and the other in Albuquerque, New Mexico, at 35+°N. The heat capacity of water is about 4,200 J/kg°C, and the hot-water supply temperature in both houses is 75°C (140°F). State and justify all additional assumptions made.
- Residual oil, with a heating value of 18,480 BTU/lbm, is used as a fuel in a power plant which produces 947,870 BTU/s of electricity. The overall efficiency of the power plant is 52%. Determine the: a. Heat input, in BTU/s b. Daily fuel consumption, in lbm c. Dimensions of the cylindrical storage (assuming length is equal to the diameter), in ft. d. Heat rejected to the environment, in BTU/s. The density of the oil is 62 lbm/ft3Solving Thermal Properties Related Problems Determine the amount of heat removed from 1.5 kg of bologna (sausage) when cooled from 24°C to -7°C. Assume MC of 59% and at -7°C, 22% won’t be frozen.Question No. 18:(a) What are the approximate chemical composition of gasoline, LPG, diesel, natural gas & methanol? How presence of moisture in air does affects the outcome of a combustion process. (b) A composite wall is formed of a 2.5 cm copper plate (k = 355 W/m.K), a 3.2 mm layer of asbestos (k = 0.110 W/m.K) and a 5 cm layer of fibre plate (k = 0.049 W/m.K). The wall is subjected to an overall temperature difference of 560°C (560°C on the Cu plate side and O°C on the fiber plate side). Estimate the heat flux through this composite ~all and the interface temperature between asbestos and fibre plate.
- Question 1.2:Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain. Question 2.1: What advantage does the effectiveness-NTU method have over the LMTD method?You are designing a 3m x 3m floor with radiant heating. The floor has 12 parallel pex pipes (k = 40 W/mK) of L = 3m, OD = 25mm and ID = 20mm. Hot water (TInfintiy 1 = 90oC, h = 200 W/m2K) runs through the pipes continuously. The surface below the pipes is perfectly insulated. Above the pipes, there is a 3mm layer of bonding material (? = 12 W/mK) and a 9mm layer of tile (k = 2 W/mK). Above the tile, there is air (TInfinity 2 = 25oC, h = 20 W/m2K). Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), Hint: Assume that the “layer” of pipe starts at the center point (e.g. for conduction purposes, the pipe is OD divided by 2 thick). For convection, consider the entire pipe surface. a) What is the total heat rate entering the room above the floor? b) What is the temperature of the top of the tile?What is the rate of rice husk consumption of a 2-ton grain dryer requiring to dry paddy from 22 to 14% in 8 hrs. The dryer overall thermal efficiency is 45%. Assume a heat of vaporization for paddy of 600 kCal/kg of moisture evaporated and heating value for rice husk of 3,000 kcal/kg.
- Energy management and Audit question A steam main 150mm outside diameter containing wet steam at 28 bar is insulated with an inner layer of diatomaceous earth, 40mm thick, and an outer layer of 85% magnesia, 25mm thick. The inside surface of the pipe is at the steam temperature, and the heat transfer coefficient for the outside surface of the lagging is 17 W/m2 K. The thermal conductivities of diatomaceous earth and 85% magnesia are 0.09, and 0.06 W/m K respectively. Neglecting radiation, and the thermal resistance of the pipe water flow rate is 1400 kg/h. Taking the specific heat capacity of water as 4.19 kj/kg K, calculate; The required pipe length for parallel-flow The required pipe length for counter-flowA laboratory space to be maintained at 24oC DB and 50% RH experiences a sensible-cooling load of 42 kW and a latent load of 18 kW. Because the latent load is heavy, the air-conditioning system is equipped for reheating the air leaving the cooling coil. The cooling coil has been selected to provide outlet air at 9 oC and 95% RH. What is (a) the air rate and (b) the temperature of supply air? Air pressure is 101.325 kPaDiscuss briefly the different types of heat loads which have to be taken into account in order to estimate the total heat load of a large restaurant for summer air conditioning?