Experimental study on performance of new type of pulsating heat pipe for battery cooling
A C-shaped pulsating heat pipe(PHP)for battery cooling was proposed,it has better heat dissipation and wrapping characteristics.Methanol,acetone,deionized water,ethanol and methanol-acetone mixture were selected as the working medium of PHP,and the performance of PHP under different heating power(30-210 W)and filling rate(FR)(30%,45%,55%,65%,75%)was investigated experimentally.The results show that too high or too low FR is not conducive to the stable operation of PHP.In practical application,thermal resistance,heat transfer limit and other indicators need to be comprehensively considered to select the appropriate FR.In the range of experimental research,the optimal FR of PHP is about 45%.Under this FR,PHP has low thermal resistance,small fluctuation of evaporation temperature,and stable operation.The thermal properties of the working medium significantly affect the working characteristics of PHP.Considering the evaporation temperature and thermal resistance,the PHP filled with methanol-acetone mixture shows better performance.The battery cooling system based on C-shaped PHP is able to meet the battery cooling requirements of the second generation Mirai,allowing a maximum volume power density of 6 kW/L of the battery,which can control its surface temperature below 84℃.It is necessary to select the working medium and layout mode of C-shaped PHP according to the application,and reasonable deployment of C-shaped PHP can ensure the safe operation of controlled objects.The relevant conclusions provide an important reference for the design of battery thermal control system.
国家科技期刊平台
NSTL
万方数据
