a shower that takes in cold water. The water passes through an electric
water heater and emerges from the showerhead at a higher temperature. The power of the
heater is 9000W
The specific heat capacity of water is 4200 J/(kg°C). The initial temperature of the cold
water is 16°C
A What is the amount of energy delivered by heating element to water, per second?
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ashower that taks in cold water I don't no
Cold water (cp = 4180 J/kg·K) leading to a shower enters a thin-walled double-pipe counter-flow heat exchanger at 15°C at a rate of 0.25 kg/s and is heated to 45°C by hot water (cp = 4190 J/kg·K) that enters at 100°C at a rate of 3 kg/s. If the overall heat transfer coefficient is 950 W/m2·K, determine the rate of heat transfer and the heat transfer surface area of the heat exchanger using the ε-NTU method. Answers: 31.35 kW, 0.482 m2
FIGURE P11–111
FIGURE P11–111
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