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High-temperature polymer electrolyte membrane fuel cell (HT-PEMFC) is a clean  energy conversion device that generates electricity directly from the  electrochemical reaction. Since the working temperature is about 160 oC, the  heating and cooling mechanisms are critical factors to maintain the optimal  working condition and prevent the cell from degradation. Simulation models  of HT-PEMFC were built for investigating the temperature distribution on the  working area of fuel cells and temperature gradient across the stack. The  ordinary method of heating by using heating pads and cooling by applying  forced convection air was compared with the heat pipe heating and cooling  technique. The results showed that heat pipe provided a more uniform  temperature distribution and current density across the fuel cells stack.  The temperature gradient of 0.214oC/cell during heating and 0.054oC/cell  during cooling processes were observed. Meanwhile, only 0.44 mA cm-2/cell of  current density gradient was found.

Thermal management of high temperature polymer electrolyte membrane fuel cells by using flattened heat pipes