NRB: Energy Balance Procedure

Energy Balance Procedure

Typically, solving energy balance problems is only marginally more involved than mass balances alone. In addition to whatever else we might be solving in the mass balance, we will now be asked to calculate the amount of heat or work going to/from the system or possibly determine something about the state of one of the streams (by finding an unknown enthalpy or energy).

The procedure to solve mass/energy balances...

OUTCOME:

Simplify and solve the General Energy Balance for non-reactive systems

TEST YOURSELF

Try this simple example!

You want to make do a mass balance on the following evaporator system, yet you do not have enough material data. Instead you need to rely on an energy balance to help you along. Determine the split of liquid and vapor coming out of the evaporator. (NOTE: check the units, the H's listed here are actually specific enthalpies!)

easy energy