Principles of Energy and Material Balances

RELEASED FROM SOLUTION, REACTION, ETC., AT SOME REFERENCE TEMP. 

If we have several components in the streams that we can distinguish as a, b, c. .., then we can describe each of these by Xjj, the weight fraction of any component, j, for any input or output stream, i. Thus, a material balance for component a would be 

We can also write an overall energy balance by defining Hj as the enthalpy of the system with respect to some reference temperature of any component. If we neglect kinetic and potential energy changes, we obtain the following  

Example 1—Developing Simultaneous Material and Energy Balances 

Note that not all of these equations are independent. For example, if we sum up the mass balances from Envelopes I, II and III, the overall material balance (Equation 3.19) is obtained. Similarly, the sum of the 

---