Exercise 4 Part 1: Mass and Energy Balance
1. Beer Processing

Energy Balance for Between Water and Beer

Energy Balance in Mixing

Heat Load Calculation for Beer HEXs

2. Glycolic Water Cooling Cycle

3. Ammonia Cooling Cycle

Ammonia is saturated liquid at step 3 and pressure losses are ignored for heat exchangers 

We assume that the valve ıs isenthalpic. Hence enthalpy of step 4 and 3 are the same

Water Cooling Calculations

4. Steam Cycle 

Steam Properties

Turbine isentropic efficiency is 80%. We can calculate enthalpy of step 2 from this information

Calculation of the Steam Flow Rate

5. Boiler Steam Cycle
Energy Balance in Degazing

Exercise 4 Part 2: Exergy Calculations
General Formulas

1. Beer Processing
Diluter 

No enthalpy change in the diluter. Hence Exergy losses equation simplifies to:

Beer Heating

Pasteurisation 

Beer Cooling

2. Glycolic Water Cycle
Glycol Cooling

3. Ammonia Cycle
Ammonia Compressor

Ammonia Condenser 

Ammonia Valve

4. Steam Cycle
Steam Turbine

Water Balance

Boiler Steam Cycle

Degazing 

Deaerator 

Pump 

Boiler 

Exergy is lost through cooling water as it leaves the system above ambient temperatureThis loss was not considered in the ammonia cycle, so it should be added here.

The difference between the inlet and outles exergy should be equal to the exergy losses. When the required calculation is done with the values above, it can be seen that there is a small difference in our case. This might be due to calculation error of the thermodynamic properties.