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Date of Publication:2022-10-06

Journal:光学精密工程

Issue:4

Page Number:943-951

ISSN No.:1004-924X

Abstract:A testing system was established to control the liquid fuel temperature of Direct Methanol Fuel Cells(DMFCs). In view of the temperature controlling for a certain flux liquid fuel, a heating block was fabricated, in which a flexible stainless steel pipe was laid with a double-runway for heating up the methanol solution. The minimum length of the pipe and the heating power of the controlling system were calculated. Furthermore, semiconductor-refrigerating chips were utilized to heat and cool the liquid flow during testing procedures and a power actuation circuit and a transition circuit according to the controlling requirements of the semiconductor-refrigerating chips and the testing system were also developed. On the basis of PID based closed-loop controller, the liquid temperature was controlled automatically and accuratelly by a software module written in Visual C++. Experimental results show that the average cooling and heating velocity of the temperature controlling system is 14 °C/min, and the precision of temperature controlling is better than ±2 °C. It satisfies the system requirements of real time performance testing of DMFC.

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