Hot gas enters a finned-tube, crossflow heat exchanger at 300 °C and exits at 100 °C. Assume that both fluids are unmixed. The gas is used to heat pressurized water flowing at 1 kg/s from 35 °C to 125 °C. Assume constant properties and use 1000 J/kg K and 4197 J/kg K as the specific heat of the gas and the water, respectively. The overall heat transfer coefficient, based on the gas-side surface area is U₁ = 100 W/m² K. Please determine the required gas side surface area (Aŉ), using the NTU method. Repeat the problem using the LMTD method. Compare your results by quantifying the difference between the two methods with a percent difference and write an observation/conclusion for this result.

Hot gas enters a finned-tube, crossflow heat exchanger at 300 °C and exits at 100 °C. Assume that both fluids are unmixed. The gas is used to heat pressurized water flowing at 1 kg/s from 35 °C to 125 °C. Assume constant properties and use 1000 J/kg K and 4197 J/kg K as the specific heat of the gas and the water, respectively. The overall heat transfer coefficient, based on the gas-side surface area is U₁ = 100 W/m² K. Please determine the required gas side surface area (Aŉ), using the NTU method. Repeat the problem using the LMTD method. Compare your results by quantifying the difference between the two methods with a percent difference and write an observation/conclusion for this result.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

Hot gas enters a finned-tube, crossflow heat exchanger at 300 °C and exits at 100 °C. Assume
that both fluids are unmixed. The gas is used to heat pressurized water flowing at 1 kg/s from 35
°C to 125 °C. Assume constant properties and use 1000 J/kg K and 4197 J/kg K as the specific
heat of the gas and the water, respectively. The overall heat transfer coefficient, based on the
gas-side surface area is U₁ = 100 W/m² K. Please determine the required gas side surface area
(Aŉ), using the NTU method. Repeat the problem using the LMTD method. Compare your
results by quantifying the difference between the two methods with a percent difference and
write an observation/conclusion for this result.

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Step 2: determine the gas side surface area using NTU method

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Step 3: determine the gas side surface area using NTU method

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Step 4: determine the gas side surface area using LMTD method

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