Problem 5.024 a power cycle receives 1000 btu by heat transfer from a reservoir at 1500°f and discharges energy by heat transfer to a reservoir at 300°f. the thermal efficiency of the cycle is 75% of that for a reversible power cycle operating between the same reservoirs. (a) for the actual cycle, determine the thermal efficiency and the energy discharged to the cold reservoir, in btu b. repeat for the reversible cycle.

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.

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.

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?