THERMODYNAMICS

 THERMODYNAMICS PROBLEM SET

PROBLEM 1: Find the enthalpy of liquid water at 50 °C, 100 °C, and 120 °C.

PROBLEM 2: Find the enthalpy of saturated steam at 50 °C, 100 °C, and 120 °C.

PROBLEM 3: Find the latent heat of vaporization at 50 °C, 100 °C.

PROBLEM 4: How much dry sugar must be added in 100 kg of aqueous sugar solution in order to increase its concentration from 20% to 50%?

PROBLEM 5: Fresh orange juice with 12% soluble solids content is concentrated to 60% in a multiple effect evaporator. To improve the quality of the final product the concentrated juice is mixed with an amount of fresh juice (cut back) so that the concentration of the mixture is 42%. Calculate how much water per hour must be evaporated in the evaporator, how much fresh juice per hour must be added back and how much final product will be produced if the inlet feed flow rate is 10000 kg/h fresh juice. Assume steady state.

PROBLEM 6: 1000 kg/h of a fruit juice with 10% solids is freeze-concentrated to 40% solids. The dilute juice is fed to a freezer where the ice crystals are formed and then the slush is separated in a centrifugal separator into ice crystals and concentrated juice. An amount of 500 kg/h of liquid is recycled from the separator to the freezer. Calculate the amount of ice that is removed in the separator and the amount of concentrated juice produced. Assume steady state.