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Modular Hydride Beds for Mobile Applications
| 题名： | Modular Hydride Beds for Mobile Applications |
| 作者： | M. E. Malinowski and K. D. Stewart |
| 关键词： | applications；mobile；ride；module；temperature；characteristics；conductivity；prediction；parallel；testin |
| 摘要： | Design, construction, initial testing and simple thermal modeling of modular, metal hydride beds (* modules ) have been completed. Originally designed for supplying hydrogen to a fuel cell on a mobile vehicle, the complete bed design consists of 8 modules and is intended for use on the Palm Desert Vehicle (PDV) under development at the Schatz Energy Center, Humbolt State University. Each module contains approximately 2 kg of a commercially available, low temperature, hydride-forming metal alloy. Waste heat from the fuel cell in the form of heated water is used to desorb hydrogen from the alloy for supplying feed hydrogen to the fuel cell. In order to help determine the performance of such a modular bed system, six modules were constructed and tested. The design and construction of the modules is described in detail. In laboratory testing, the modules meet or exceed all design criteria; Initial testing of the modules both individually and as a group showed that each module can store -30 g of hydrogen (at 165 PSIA fill pressure, 17 °C), could be filled with hydrogen in 6 minutes at a nominal, 75 standard liters/min (slm) fueling rate, and could supply hydrogen during desorption at rates of 25 slm, the maximum anticipated hydrogen fuel cell input requirement. Tests made of 5 modules as a group indicated that the behavior of the group run in parallel both in fueling and gas delivery could be directly predicted from the corresponding, single module characteristics by using an appropriate scaling factor. Simple thermal modeling of a module as an array of cylindrical, hydride-filled tubes was performed. The predictions of the model are in good agreement with experimenatal data, and indicate that the following key thermal characteristics are consistent with observed module thermal behavior; (1) the hydride tubes in each module have a thermal response time ~ 41 s; (2) the hydride has a thermal conductivity -0.4 W/m-K; and (3) the temperatures in the core of the hydride tubes, T„„ are related to the fueling rates, F, of the modules by Tm (°C) ≈ TW + 1.45*F(slm), with Tw = the cooling water temperature. |
| 报告类型： | 科技报告 |
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