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Ionic liquids for microchannel membrane-based absorption heat pumps: Performance comparison and geometry optimization

机译：微通道膜的吸收热泵离子液体：性能比较和几何优化

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Microchannel membrane-based absorption heat pump (MMAHP) shows great potential in efficiency enhancement and size reduction towards renewable/waste energy utilization. Ionic liquid (IL) mixtures with H2O as refrigerant present excellent merits in avoiding crystallization and obtaining a high coefficient of performance (COP). This study investigates the feasibility of MMAHP using five H2O/ILs (i.e., [BMIM][BF4], [DMIM][DMP], [EMIM][DMP], [EMIM][OAc], and [EMIM][OMs]) under various working conditions, with H2O/LiBr as the baseline. However, MMAHP and IL mixtures are constrained by the high solution pressure drop due to narrow flow channels and high IL viscosities; therefore, the geometries are optimized to maximize efficiency and compactness. The results show that under a desired cooling capacity of 0.5 kW, [EMIM][OAc] and [EMIM][OMs] can yield higher COPs than other ILs and LiBr. The smallest system volume of each working pair increases with the targeted COP to satisfy the requirement of membrane liquid entry pressure (LEP). Nevertheless, [DMIM] [DMP], [EMIM][DMP], and LiBr cannot achieve COPs above 0.70, 0.75, and 0.80, respectively, within the involved geometries range due to the limitation of LEP (80 kPa). Comparing the Pareto frontiers that show the trade-off between the COP and compactness, LiBr is the best choice with targeted COPs below 0.778, while [EMIM][OAc], [EMIM][OMs], and [BMIM][BF4] perform better with targeted COPs above 0.778. Meanwhile, although considering the constraint of LEP would make the Pareto frontier moving towards lower COP and smaller compactness, the MMAHP still outperforms the conventional falling-film systems in efficiency and compactness when the targeted COP is below 0.80.
机译：微通道膜的吸收热泵（MMAHP）显示出效率提高和尺寸降低可再生/废能利用的巨大潜力。离子液体（IL）与H2O混合物作为制冷剂在避免结晶和获得高度的性能（COP）中存在卓越的优点。本研究研究了使用五H 2 O / ILS的MMAHP的可行性（即[BMIM] [BF4]，[DMIM] [emim] [emim] [emim] [emim] [eac]和[emim] [OMS] ）在各种工作条件下，用H2O / LIBL作为基线。然而，由于流动通道和高II粘度窄，MMAHP和IL混合物受到高溶液压降的约束;因此，几何形状被优化以最大化效率和紧凑性。结果表明，在所需的冷却能力为0.5kW，[emim] [OAC]和[emim] [OMS]中可以产生比其他IL和LIBL更高的警察。每个工作对的最小系统体积随目标COP增加，以满足膜液进入压力（LEP）的要求。然而，由于LEP的限制（80kPa）的限制，在涉及的几何形状范围内，[DMIM] [emim] [emim]，[emim] [emim] [emim]，[emim] [emim]，[emim] [dmp]和kell分别无法在0.70,0.75和0.80中实现警察。比较帕累托前沿在COP和紧凑性之间进行权衡，LIBL是目标警察低于0.778的最佳选择，而[emim] [OAC]，[emim] [OMS]和[BMIM] [BF4]执行对于0.778以上的目标警察更好。同时，虽然考虑到LEP的约束将使帕累托前沿朝着较低的警察移动和更小的紧凑性，但是当目标COP低于0.80时，MMAHP仍然优于效率和紧凑性的传统下降膜系统。

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