Water enters an ice machine at 55°f and leaves as ice at 25°f. if the cop of the ice machine is 2.45 during this operation, determine the required power input for an ice production rate of 28 lbm/h. (169 btu of energy needs to be removed from each lbm of water at 55°f to turn it into ice at 25°f.)

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.