2. A creamery must cool 20,000 liters of milk received each day from initial temperature of 29 °C to afinal temperature of 2 °C in 5 hours. If refrigeration losses amount to 10 percent of the cooling load, what must be the capacity of the refrigerating machine? Note: Specific heat of milk is 3.9 kJ/kg-K and S.G. = 1.05

For refrigeration, answer the following questions

-Gas supply line- Gas A 1.5 m3 tank initially contains a gas at 140 kPa, 340 K. The tank is connected a line carrying same gas at 1400 kPa and 340 K. What should be heat transfer during this process, in kJ, so that the final pressure and temperature are 1400 kPa and 340 K, respectively. (cp=0.72 kJ/kg.K, cv=0.48 kJ/kg.K).

Problem 5. A 1000 cubic foot room is initially at standard temperature and pressure. A resistance heater in the room is consuming 1500W of electricity. What is the air temperature of the room after 3 hours? Assume the room acts as an isolated system. Hint: The specific heat of a substance is the amount of heat it takes to warm one unit mass of material by one degree. The specific heat of air (assuming constant volume) can be taken as C₂ = 700J/kg°C. This relates the total heat added to the system to its temperature rise.