R-134a in saturated liquid form at -16 degree in an ice machine is evaporated to atmospheric pressure and ensured to freeze at 0 degree. R-134a is leaving from the evaporator as saturated vapor is known. The device produces ice at a flow rate of 2000 kg / h and a temperature of 0 degree. Calculate the entropy generation rate.

Evaporator single effect is used to upgrade the concentrate 10000 kg/h of tomato juice than 5% solids the total to 30% solids total. Juice enters the Evaporator at 15 °C. The Evaporator is operated with Steam (quality 80%) in 143.27 kPa. The condition of vacuum in the Evaporator allow the juice to a boil on the 75 °C. The hot kind of material dilute is 4.1 kJ/(kg °C) and the product the concentrate is a 3.1 kJ/(kg °C). Count a. The Rate of the needs of steam = ...kg/h. b. The economic steam if the temperature is condensate is released at 75 °C. = ...(kg water evaporated/kg of steam)