Insertion piece for measuring transient heat flow density distribution in fuel cell

Abstract

The invention discloses an insertion piece for measuring heat flow density distribution in a fuel cell, which is a device for measuring the heat flow density distribution in the fuel cell. The insertion piece comprises a gold-plated stainless steel substrate, and leaks and ribs, which are in the same sizes, the same shapes and the corresponding positions with grooves and ridges on a flow field plate of the fuel cell to be measured, are arranged on the substrate. A thin film heat flow meter is arranged on the rib between the adjacent leaks or holes on the measuring insertion piece respectively, the vacuum film coating technology is adopted for vapor deposition of seven layers of thin films, leading-out wires of the thin film heat flow meters extend to the edge of the substrate by adopting the method of printing a circuit, and a standard wiring port connected with an external circuit is further formed. The measuring insertion piece is placed between the flow field plate of the fuel celland a membrane electrode. The insertion piece for measuring the heat flow density distribution in the fuel cell is completely independent of a measured object, and the fuel cell does not need to be transformed; furthermore, as the placement position of the insertion piece is very near to the membrane electrode, the insertion piece can measure the real-time heat flow density distribution situationin the fuel cell.

Description

Technical field [0001] The invention belongs to a transient heat flow density distribution measuring insert inside a fuel cell, relates to the measurement of the transient heat flow density distribution inside a fuel cell, and particularly relates to a transient heat flow density distribution measuring device. Background technique [0002] A fuel cell is an energy conversion device that directly converts the chemical energy stored in the fuel into electrical energy. The conversion efficiency can theoretically reach 85% to 90%, which is not limited by the Carnot cycle. Due to the high power generation efficiency of fuel cells, CO is reduced 2 Compared with traditional thermal power generators, CO 2 The discharge can be reduced by 40%-60%. Studies have shown that when a car uses a fuel cell fueled by hydrogen reformed from natural gas instead of a gasoline internal combustion engine, its CO 2 Relatively speaking, the emission volume of the company is reduced by about 72%. Recent s...

AI Technical Summary

Problems solved by technology

The traditional steady-state method has a clear principle of temperature measurement, is convenient to manufacture, directly measures, and has a wide range of applicable temperatures. However, it takes a long time to measure, has a large volume, and has hysteresis in response to changing temperatures, which cannot meet the current needs. High transient heat flow measurement index and other issues

Therefore, thin-film heat flow meters have attracted the attention of international researchers due to their short response time, high accuracy, small heat capacity, and low environmental requirements, but their application in fuel cells is still rare.

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