A long flat plate is heat treated by suspending it in a tubular furnace with a diameter of 2 m and a wall temperature of 1000 K. If the wall of the furnace and the surfaces of the plate may be approximated as blackbodies and the plate is at an initial temperature of 300 K, what is the net rate of radiation heat transfer per unit length to the plate

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.