Arefrigeration system to be installed must be capable of cooling 10,000 lbm of pork shoulder from 40 °f to 10 °f in 2 hours. the pork shoulder has a freezing point of 28 °f, water content of 73%, a specific heat above freezing of 0.86 btu/lbm-°f and below freezing of 0.53 btu/lbm-°f, and a thermal conductivity of 0.71 btu/hr-ft-°f. assuming atmospheric conditions, what is the required capacity of refrigeration system? use the latent heat of fusion for water (at 1atm), hf= 144 btu/lbm.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2