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Effects of cooling system parameters on heat transfer in PAFC stack (Ph.D. Thesis)

作者:科技文献资料网 时间:2018-10-19 15:46:19  浏览:8672   来源:科技文献资料网
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[唯一标识符]:CDSITC.AEROSPACE.N95-29131
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1995-29131; Reference AN: N95-29131
[标题]:Effects of cooling system parameters on heat transfer in PAFC stack (Ph.D. Thesis)
[作者]:ABDUL AZIZ ALI A
[文摘]:Analytical and experimental study for the effects of cooling system parameters on the heat transfer and temperature distribution in the electrode plates of a phosphoric acid fuel-cell has been conducted. An experimental set-up that simulates the operating conditions prevailing in a phosphoric-acid fuel-cell stack was designed and constructed. The set-up was then used to measure the overall heat transfer coefficient, the thermal contact resistance, and the electrode temperature distribution for two different cooling plate configurations. Two types of cooling plate configurations, serpentine and straight, were tested. Air, water, and oil were used as coolants. Measurements for the heat transfer coefficient and the thermal contact resistance were made for various flow rates ranging from 16 to 88 Kg/hr, and stack clamping pressure ranging from O to 3448 Kpa. The experimental results for the overall heat transfer coefficient were utilized to derive mathematical relations for the overall heat transfer coefficient as a function of stack clamping pressure and Reynolds number for the three coolants. The empirically derived formulas were incorporated in a previously developed computer program to predict electrodes temperature distribution and the performance of the stack cooling system. The results obtained were then compared with those available in the literature. The comparison showed maximum deviation of +/-11
[关键词]:COOLANTS ; COOLING SYSTEMS; ELECTRICAL MEASUREMENT; ELECTRODES ; FUEL CELLS; HEAT TRANSFER; LIQUID COOLING; OILS ; PHOSPHORIC ACID; PLATES STRUCTURAL MEMBERS; TEMPERATURE MEASUREMENT; WATER ; COMPUTER PROGRAMS; CONTACT RESISTANCE; FLOW VELOCITY; HEAT TRAN
[出版年份]:1985
[专业领域]:FLUID MECHANICS AND ELECTRICAL ENGINEERING
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[文献类型]:科技报告
[标题]:The Effects of Substrate Composition on Thick Film Circuit Reliability.
[作者]:vest, r. w.
[机构]:Purdue Research Foundation Lafayette IN
[关键词]:substrates,printed circuits,ceramic materials,solubility,glass,thick films,resistors,aluminum oxides,aluminum compounds,silicon compounds,magnesium compounds,electrical resistance,viscosity,ntisdodxa
[出版年份]:1979
[报告时间]:28Feb 79,
[页码]:91p
[馆藏索取号]:AD-A068220
[总页数]:94


[唯一标识符]:CDSITC.AEROSPACE.N86-23919
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:N1986-23919; Reference AN: N86-23919
[标题]:Study of cold-cathode and RF-excitation for low power CO2 waveguide lasers (Final Report)
[作者]:HOCHULI U
[文摘]:Initial results indicate that transversely RF excited 2W CW CO2 waveguide lasers can be built to last in excess of 10000 hours. This result has been achieved with either internal electrodes or capacitive wall coupling and with either CO-or N2-bearing gas mixtures. On-off switching seems to be quite well tolerated. RF conductance and starting voltage measurements for six different gas mixtures and four pressure parameters are given. (GRA)
[关键词]:ACCELERATED LIFE TESTS; CARBON DIOXIDE LASERS; CARBON MONOXIDE; COLD CATHODE TUBES; CONTINUOUS WAVE LASERS; ELECTRODES ; ELECTRON PUMPING; EXCITATION ; NITROGEN ; OPTICAL WAVEGUIDES; RADIO FREQUENCIES; SWITCHING CIRCUITS; WAVEGUIDE LASERS; COUPLING ; INDE
[出版年份]:1985
[专业领域]:LASERS AND MASERS

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