Eight fluid ounces (1 qt = 32 oz) of a beverage in a glass at 18.0°c is to be cooled by adding ice and stirring. the properties of the beverage may be taken to be those of liquid water.
the enthalpy of the ice relative to liquid water at the triple point is 348 kj/kg.

estimate the mass of ice (g) that must melt to bring the liquid temperature to 4°c, neglecting energy losses to the surroundings.

(note: for this isobaric batch process, the energy balance reduces to q δh.)

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.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

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.