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Hot water enters a counterflow heat exchanger at 99 C. It is used to heat a cool stream of water from 4 to 32 C.

Hot water enters a counterflow heat exchanger at 99 °C. It is used to heat a cool stream of water from 4 to 32 °C. The flow rate of the cool stream is 1.3 kg/s, and the flow rate of the hot stream is 2.6 kg/s. The overall heat-transfer coefficient is 830W/m2·°C. What is the area of the heat exchanger? Calculate the effectiveness of the heat exchanger.

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