CMU Intellectual Repository: การออกแบบระบบการจัดการความร้อนในเซลล์เชื้อเพลิงแบบสแต็กชนิดเมมเบรนแลกเปลี่ยนโปรตอน = Design of thermal management system in proton exchange membrane fule cell st

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Thesis Title Design of Thermal Management System in Proton Exchange Membrane Fuel Cell Stack

Author Miss Wassana Kamopas

Degree Master of Engineering (Energy Engineering) Thesis Advisor Asst. Prof. Dr. Yottana Khunatorn

ABSTRACT

This research focuses on the performance of small heat exchanger which is used in Thermal management in Proton Exchange Membrane Fuel Cell (PEMFC) stack 300 W. The water is coolant in small heat exchanger. And the experiment is performed on PEMFC stack 300 W in order to determine power density. In addition, this research studies on temperature distribution and heat transfer in serpentine graphite current collector plates of the fuel cell 1, 3, 5 and 7 cells. Thermal management system is designed and set up. 1, 3, 5 and 7 cells fuel cell operated with and without thermal management system are compared. And a 1D model of the temperature distribution in plate is studied.

The result show to be a part. The performance of small heat exchanger, it is concluded that water flow rate have impact on heat rate of heat exchanger. At 40 - 70 ^oC, heat rate is 149.57 - 765.10 W , effectiveness of heat exchanger is 0.34-0.40. For the efficiency of PEMFC stack 300 W fuel cell, it is found that could produce power density of 728.91 mW/cm² at current density 46.87 mA/cm² and 15.56 V in humidified condition. The experiment of the fuel cell 1, 3, 5 and 7 cells result show that the power production depends on stack. And the maximum power density is 932.40 mW/cm² at the fuel cell stack 7 cell. For all fuel cell stack condition is suitable at 70 ^oC of humidity temperature and 50 – 60 ^oC of cell temperature. Fuel cell temperature is controlled by fan which used 18 W of electricity or 72 % of maximum power production. The temperature distribution on plate is close to each point and inside temperature is higher than

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outside. Finally, A 1D model of temperature distribution show that membrane temperature is 29.68 ^oC at 120 min and the model is incorrect 12.92%