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Assumptions made for calculation of logarithmic mean temperature difference are
(i) Constant overall heat transfer coefficient
(ii) The kinetic and potential energy changes are negligible
(iii) There is no conduction of heat along the tubes of heat exchanger
Identify the correct statements
  • a)
    1, 2 and 3
  • b)
    1 and 3
  • c)
    1 and 2
  • d)
    2 and 3
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Assumptions made for calculation of logarithmic mean temperature diffe...
These assumptions are made for simplicity. During heat exchange between two fluids, the temperature of the fluids change in the direction of flow and consequently there occurs a change in the thermal head causing the flow of heat.
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Most Upvoted Answer
Assumptions made for calculation of logarithmic mean temperature diffe...
Assumptions made for calculation of logarithmic mean temperature difference are:

(i) Constant overall heat transfer coefficient
(ii) The kinetic and potential energy changes are negligible
(iii) There is no conduction of heat along the tubes of heat exchanger

Explanation:

(i) Constant overall heat transfer coefficient: This assumption is made to simplify the calculation of heat transfer rate in a heat exchanger. It assumes that the overall heat transfer coefficient remains constant throughout the heat exchanger. This assumption is valid for heat exchangers where the fluid flow and physical properties do not vary significantly.

(ii) The kinetic and potential energy changes are negligible: This assumption is made to simplify the calculation of temperature differences between the hot and cold fluids. The assumption implies that the fluids do not change their velocities or heights significantly as they flow through the heat exchanger. This is a valid assumption when the velocities are low and the heights are small.

(iii) There is no conduction of heat along the tubes of heat exchanger: This assumption is made to simplify the calculation of temperature differences between the hot and cold fluids. The assumption implies that there is no heat transfer through the walls of the tubes of the heat exchanger. This assumption is valid when the walls of the tubes are thin and the thermal conductivity of the tube material is low.

Therefore, the correct answer is option 'A', which includes all three assumptions.
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