Q: Consider a double-pipe counterflow heat exchanger. In order to
Consider a double-pipe counterflow heat exchanger. In order to enhance heat transfer, the length of the heat exchanger is now doubled. Do you think its effectiveness will also double?
See AnswerQ: Consider a shell-and-tube water-to-water
Consider a shell-and-tube water-to-water heat exchanger with identical mass flow rates for both the hot- and cold-water streams. Now the mass flow rate of the cold water is reduced by half. Will the e...
See AnswerQ: Consider two double-pipe counterflow heat exchangers that are identical except
Consider two double-pipe counterflow heat exchangers that are identical except that one is twice as long as the other one. Which heat exchanger is more likely to have a higher effectiveness?
See AnswerQ: How is the NTU of a heat exchanger defined? What does
How is the NTU of a heat exchanger defined? What does it represent? Is a heat exchanger with a very large NTU (say, 10) necessarily a good one to buy?
See AnswerQ: Consider a heat exchanger that has an NTU of 4. Someone
Consider a heat exchanger that has an NTU of 4. Someone proposes to double the size of the heat exchanger and thus double the NTU to 8 in order to increase the effectiveness of the heat exchanger and...
See AnswerQ: Consider a heat exchanger that has an NTU of 0.1
Consider a heat exchanger that has an NTU of 0.1. Someone proposes to triple the size of the heat exchanger and thus triple the NTU to 0.3 in order to increase the effectiveness of the heat exchanger...
See AnswerQ: The radiator in an automobile is a crossflow heat exchanger (UAs
The radiator in an automobile is a crossflow heat exchanger (UAs = 10 kW/K) that uses air (cp = 1.00 kJ/kg⋅K) to cool the engine-coolant fluid (cp = 4.00 kJ/kg⋅K). The engine fan draws 22°C air throug...
See AnswerQ: Consider an oil-to-oil double-pipe heat exchanger
Consider an oil-to-oil double-pipe heat exchanger whose flow arrangement is not known. The temperature measurements indicate that the cold oil enters at 15°C and leaves at 55°C, while the hot oil ente...
See AnswerQ: Consider a double-pipe parallel-flow heat exchanger of length
Consider a double-pipe parallel-flow heat exchanger of length L. The inner and outer diameters of the inner tube are D1 and D2, respectively, and the inner diameter of the outer tube is D3. Explain ho...
See AnswerQ: Hot water enters a double-pipe counterflow water-to oil
Hot water enters a double-pipe counterflow water-to oil heat exchanger at 190°F and leaves at 100°F. Oil enters at 70°F and leaves at 130°F. Determine which fluid has the smaller heat capacity rate, a...
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