Two rooms are separated by a wall that is wood panel, r= 0.93 (usual units) on one side, withfiberglass insulation r = 13.0 between the walls and wall board r = 0.46 on the other. one roomis air conditioned at 74 deg. f and the room is not air conditioned at 92 deg. f. film coefficientsare r = 0.68 on both walls. what is the heat transfer rate from the warm room to the cool room? neglect the heat transfer reduction by the wall studs.

Ahouse has the following electrical appliance usage (1) single 40w lamp used for 4 hours per day (2) single 60w fan used for 12 hours per day (3) single 200w refrigerator that runs 24 hours per day with compressor run 12 hours and off 12 hours find the solar power inverter size in watt with correction factor of 1.25.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?