The purification of hydrogen gas by diffusion through a palladium sheet was discussed in section 5.3. compute the number of kilo- grams of hydrogen that pass per hour througha 6-mm-thick sheet of palladium having an area of 0.25 m2 at 600? ? c. assume a diffusion coefficient of 1.7 ? ? 10? ? 8 m2/s, that the con- centrations at the high- and low-pressure sides of the plate are 2.0 and 0.4 kg of hy- drogen per cubic meter of palladium, and that steady-state conditions have been attained.

Aheat pump using refrigerant-134a heats a house by using underground water at 8°c as the heat source. the house is losing heat at a rate of 60,000 kj/h. the refrigerant enters the compressor at 280 kpa and 0°c, and it leaves at 1 mpa and 60°c. the refrigerant exits the condenser at 30°c. determine: (a) the power input to the heat pump, (b) the rate of heat absorption from the water, and (c) the increase in electric power input if an electric resistance heater is used instead of a heat pump