The evaporator economy is dependent on the ________(a) Heat transfer rate(b) Mass transfer rate(c) Energy balance considerations(d) Mass balance considerationsThis question was posed to me in examination.My query is from Solving Unsteady topic in section Unsteady – State Material and Energy Balances of Bioprocess Engineering

The evaporator economy is dependent on the ________(a) Heat transfer r

1.	The evaporator economy is dependent on the ________(a) Heat transfer rate(b) Mass transfer rate(c) Energy balance considerations(d) Mass balance considerationsThis question was posed to me in examination.My query is from Solving Unsteady topic in section Unsteady – State Material and Energy Balances of Bioprocess Engineering
Answer» Right choice is (a) Heat transfer rate Best EXPLANATION: There are three main measures of EVAPORATOR performance: Capacity (kg vaporized/time), Economy (kg vaporized/ kg steam input), Steam consumption (kg/hr). The performance of a evaporator is EVALUATED by the capacity and the economy. The rate of heat transfer q through the heating surface of an evaporator, by the DEFINITION of overall heat transfer coefficient, is product of three factors i) The area of heat transfer surface A ii) The overall heat transfer coefficient U iii) The overall temperature dropΔT Q = U * A * ΔT.

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