Consider an isothermal medium at temperature T, confined between two large, parallel black plates that are isothermal at the same) temperature Tw. The medium is gray and absorbs and emits, but does not scatter. Determine an expression for the heat transfer rates within discrete transfer method

An engine runs on the ideal diesel cycle. the cycle has a compression ratio of 20 and a cutoff ratio of 2. the highest temperature in the cycle is 1200 k. if the heat into the system is 300 kj/kg of working fluid and using variable specific heats determine the work produced per mass of working fluid