Analysis of the transient behavior of an engine cooling radiator
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2019-06-23
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RODRIGUES, K.
LIRA, L. M.
IENO, J. P. S.
Luis Novazzi
Cyro Albuquerque
LIRA, L. M.
IENO, J. P. S.
Luis Novazzi
Cyro Albuquerque
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ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
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RODRIGUES, K.; LIRA, L. M.; IENO, J. P. S.; NOVAZZI, L.; ALBUQUERQUE, C. Analysis of the transient behavior of an engine cooling radiator. ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, p. 1761-1170, jun. 2019.
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© ECOS 2019 - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. All rights reserved.The transient analysis of a radiator may be important in situations of high sudden demands and for use in electric vehicles or in heat recovery systems. This work aims to study the dynamic behavior of a radiator in different operational conditions. A mathematical model to simulate its behavior was proposed and validated with experimental data. An experimental bench was assembled with the radiator inside a wind tunnel. The water flows through a closed circuit containing the radiator, a tank, a pump and heaters. Thermocouples were placed in several points for temperature measurement. The flow of water and air were also measured. Some tests were carried out to verify the transient performance, by starting from a steady state condition and then imposing, through a heater, different heat loads on the system. The model was developed from energy balances for the radiator air, water and aluminum, the tank and the heater. The solution of these equations allows to obtain the variation of the temperature in each one of these components. It was observed that the radiator responds very quickly to the variation of the heating, in a few seconds, probably due to its small mass and large area of heat transfer. Then the temperature of the radiator increases more slowly accompanying the increase of temperature of the whole system until all the volume of water arrives at the steady state, taking about 15 minutes. The outlet temperature of air and water and the aluminum had a very close behavior. The model presented a behavior very close to the experimental results, showing that even an analysis with few control volumes can bring satisfactory results for the simulation of the transient state under different conditions.