In cars, the coolant cools down the engine and prevents overheating. By absorbing heat from the engine, the coolant becomes heated. The coolant is then cooled down by the radiator. A primitive car radiator can be considered an unmixed crossflow heat exchanger where cold air from the outside serves as cold fluid that cools down the hot coolant. Assume the average specific heat of air and the coolant are, respectively, 1007 J/kg-K and 3300 J/kg.K. The coolant enters the radiator at 120°C and exits at 50°C. The mass flow rate of the coolant is 0.4 kg/s. The air intake temperature is 20°C and you measured the outlet temperature of the air to be 40°C. What is the effectiveness of this radiator? What is the UA of this radiator?
In cars, the coolant cools down the engine and prevents overheating. By absorbing heat from the engine, the coolant becomes heated. The coolant is then cooled down by the radiator. A primitive car radiator can be considered an unmixed crossflow heat exchanger where cold air from the outside serves as cold fluid that cools down the hot coolant. Assume the average specific heat of air and the coolant are, respectively, 1007 J/kg-K and 3300 J/kg.K. The coolant enters the radiator at 120°C and exits at 50°C. The mass flow rate of the coolant is 0.4 kg/s. The air intake temperature is 20°C and you measured the outlet temperature of the air to be 40°C. What is the effectiveness of this radiator? What is the UA of this radiator?
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.13P
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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.
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