You have asked to design the smallest (physically) most efficient heat exchanger

Question

You have asked to design the smallest (physically) most efficient heat exchanger you can, what design do you recommend and why Shell and Tube heat exchangers can have one or two shell, and several tube passes, what the advantages of having multiple passes of both shell and tubes? A mixed cross flow heat exchanger is located in a 1.5 m X 1.5 m duct and consist of 160thin-walled tubes of 1.5 diameter, water (Cp=4194 J/kg/k, p=999.7 kg/m^3) enters the tube at 5 C degree with a velocity of m/s, hot air at 80 C degree enters the duct velocity of 10 10 m/s The mass flow rate of the water and air The maximum heat transfer achievable The number of heat transfer units (UTN) and the effectiveness of heat exchanger Exist temperature of the water and air You have asked to design the smallest (physically) most efficient heat exchanger you can, what design do you recommend and why Shell and Tube heat exchangers can have one or two shell, and several tube passes, what the advantages of having multiple passes of both shell and tubes? A mixed cross flow heat exchanger is located in a 1.5 m X 1.5 m duct and consist of 160thin-walled tubes of 1.5 diameter, water (Cp=4194 J/kg/k, p=999.7 kg/m^3) enters the tube at 5 C degree with a velocity of m/s, hot air at 80 C degree enters the duct velocity of 10 10 m/s The mass flow rate of the water and air The maximum heat transfer achievable The number of heat transfer units (UTN) and the effectiveness of heat exchanger Exist temperature of the water and air You have asked to design the smallest (physically) most efficient heat exchanger you can, what design do you recommend and why Shell and Tube heat exchangers can have one or two shell, and several tube passes, what the advantages of having multiple passes of both shell and tubes? A mixed cross flow heat exchanger is located in a 1.5 m X 1.5 m duct and consist of 160thin-walled tubes of 1.5 diameter, water (Cp=4194 J/kg/k, p=999.7 kg/m^3) enters the tube at 5 C degree with a velocity of m/s, hot air at 80 C degree enters the duct velocity of 10 10 m/s The mass flow rate of the water and air The maximum heat transfer achievable The number of heat transfer units (UTN) and the effectiveness of heat exchanger Exist temperature of the water and air

Explanation / Answer

For similar space plate and frame type heat exchanger are much better as compared to shell and tube type of heat exchanger. This is due to higher contact surface area.

On increasing the passes of tube side the area reduces and due to which velocity of fluid inside tube increases. Which also results in higher pressure drop.

shell side baffles create turbulence and increase shell side heat transfer coefficient.

OOOOOOOOO

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