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Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition by Christie John Geankoplis

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8.4. CALCULATION METHODS FOR SINGLE-EFFECT EVAPORATORS

8.4A. Heat and Material Balances for Evaporators

The basic equation for solving for the capacity of a single-effect evaporator is Eq. (8.2-1), which can be written as

Equation 8.4-1

where ΔTK (°F) is the difference in temperature between the condensing steam and the boiling liquid in the evaporator. In order to solve Eq. (8.4-1) the value of q in W (btu/h) must be determined by making a heat and material balance on the evaporator shown in Fig. 8.4-1. The feed to the evaporator is F kg/h (lbm/h) having a solids content of xF mass fraction, temperature TF, and enthalpy hF J/kg (btu/lbm). Coming ...

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