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An oil cooler in a high performance engine has an outside surface area 0.12 m2 and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m 2 K. Find out the heat transfer rate?

  • a)
    238.43 W

  • b)
    190.68 W

  • c)
    543.67 W

  • d)
    675.98 W

Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
An oil cooler in a high performance engine has an outside surface area...
To find the heat transfer rate in the oil cooler, we can use the formula:

Q = h * A * ΔT

Where:
Q = Heat transfer rate (in watts)
h = Surface coefficient (in W/m2K)
A = Surface area (in m2)
ΔT = Temperature difference between the surface and the air (in K)

Given:
Surface area (A) = 0.12 m2
Surface temperature (T1) = 65 °C = 65 + 273.15 = 338.15 K
Air temperature (T2) = 30 °C = 30 + 273.15 = 303.15 K
Surface coefficient (h) = 45.4 W/m2K

Substituting the given values into the formula, we have:

ΔT = T1 - T2 = 338.15 K - 303.15 K = 35 K

Q = 45.4 W/m2K * 0.12 m2 * 35 K
Q = 190.68 W

Therefore, the heat transfer rate in the oil cooler is 190.68 W.

Hence, option B (190.68 W) is the correct answer.
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An oil cooler in a high performance engine has an outside surface area 0.12 m2and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m2K. Find out the heat transfer rate?a)238.43 Wb)190.68 Wc)543.67 Wd)675.98 WCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An oil cooler in a high performance engine has an outside surface area 0.12 m2and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m2K. Find out the heat transfer rate?a)238.43 Wb)190.68 Wc)543.67 Wd)675.98 WCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An oil cooler in a high performance engine has an outside surface area 0.12 m2and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m2K. Find out the heat transfer rate?a)238.43 Wb)190.68 Wc)543.67 Wd)675.98 WCorrect answer is option 'B'. Can you explain this answer?.
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