An idcal gas refrigeration cycle using helium as the working fluid operates between the pressure limits of 200kpa and 600kpa. helium is cooled to 75°c before entering the turbine. calculate the minimum temperature in this cycle. note that helium is an ideal gas with constant specific heats, with k =5/3

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.