Two very long concentric cylinders of diameters d1 = 0.42 m and d2 = 0.5 m are maintained at uniform temperatures of t1 = 950 k and t2 = 500 k and have emissivities ε1 = 1 and ε2 = 0.55, respectively. determine the net rate of radiation heat transfer between the two cylinders per unit length of the cylinders. (use σ = 5.67 × 10-8)

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?