The process shown in the above figure is a constant volume electric water heater

Question

The process shown in the above figure is a constant volume electric water heater. The electrical element switches on and off in attempting to control the hot water temperature. Water is always being withdrawn from this 100 liter capacity tank at the rate of 10 liters/min; cold water usually at 30 degree C automatically flows into the tank at precisely the same rate. It can be assumed that (density*specific heat) equal to 1. The unit of time is minute. calculate the energy required to maintain the tank water temperature at 80 degree C mark.

Explanation / Answer

Heat required per minute to increase temperature of 10l water to 80C=mcT=10*1*(80-30)= 500kCal/min=2093kJ/min

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