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首页> 外文会议>ASME(American Society of Mechanical Engineers) Energy Sustainability Conference; 20070627-30; Long Beach,CA(US) >VRA ENHANCEMENT OF TWO STAGE LIBR CHILLER PERFORMANCE IMPROVES SUSTAINABILITY
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VRA ENHANCEMENT OF TWO STAGE LIBR CHILLER PERFORMANCE IMPROVES SUSTAINABILITY

机译：通过VRA增强两阶段Libr冷水机性能可提高可持续性

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摘要

Multi-effect LiBr absorption chiller must take advantage of higher temperature heat sources to achieve higher COP so as to be competitive with lower first cost comparable commercially available, efficient electric chillers under current market pricing conditions. Yet a nominal conventional double-effect absorption chiller operating at a COP of 1.0 versus a comparable efficient motor driven centrifugal chiller operating at a COP of 7.0 will consume slightly less than twice the amount of prime natural gas (NG) source energy assuming a local 28% NG fired electric utility plant's annual average efficiency and a 10% gas distribution leakage and 10% electric transmission loss to user's meter. However if the COP of the above referenced double-effect LiBr absorption chiller were doubled, it would consume approximately the same amount of prime NG source energy and equally sustainable from an environmental impact standpoint. Consequently research to further improve double-effect LiBr absorption chillers beyond the VRA benefits reported to date was investigated in this study. Former simulation studies of a low differential pressure-vapor recompression absorber (VRA) reported in 2001 indicated a 7% COP efficiency gain, while additional simulation studies reported in 2006 indicated a 38% COP efficiency gain with the VRA operating at elevated differential pressures at the same upper stage concentrator temperature previously considered. Double-effect LiBr absorption chillers are limited by corrosion effects, which have been shown to accelerate significantly above 160 ℃.In this paper, a reverse series flow, double-effect LiBr absorption chiller employing a VRA is investigated over a wider range of upper stage concentrator and absorber cooling temperatures but operating at the same low and elevated pressure differential levels reported earlier showed significant improvement in COP efficiency,capacity performance and projected hybrid operational cost.
机译：多效LiBr吸收式冷水机必须利用高温热源来实现更高的COP，才能在当前市场价格条件下以较低的首发成本竞争可比的市售高效电冷水机。假设在本地28天然气发电厂的年平均效率为％，燃气分配泄漏量为10％，用户仪表的输电损耗为10％。但是，如果上述双效LiBr吸收式制冷机的COP倍增，则它将消耗大约相同量的主要NG源能源，并且从环境影响的角度来看，可持续发展。因此，在这项研究中，进行了研究，以进一步提高双效LiBr吸收式制冷机，使其超越迄今为止报道的VRA的优势。 2001年报道的低差压-蒸汽再压缩吸收器（VRA）的先前模拟研究表明COP效率提高了7％，而2006年报道的其他模拟研究表明，VRA在高差压条件下运行时COP效率提高了38％。先前考虑的上级浓缩器温度相同。双效LiBr吸收式制冷机受腐蚀作用的限制，已证明在160℃以上时会明显加速。本文对采用VRA的反向串联流双效LiBr吸收式制冷机进行了较广泛的研究。浓缩器和吸收器的冷却温度，但在先前报道的相同的低压差和升高的压差水平下运行，显示出COP效率，容量性能和预计的混合运行成本有了显着提高。

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