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首页> 外文期刊>Energy Conversion & Management >A systematic parametric study and feasibility assessment of solar-assisted single-effect, double-effect, and triple-effect absorption chillers for heating and cooling applications
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A systematic parametric study and feasibility assessment of solar-assisted single-effect, double-effect, and triple-effect absorption chillers for heating and cooling applications

机译：用于加热和冷却应用的太阳能辅助单效，双效和三效吸收式制冷机的系统化参数研究和可行性评估

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The present work investigates the feasibility of solar heating and cooling (SHC) absorption systems based on combining three types of LiBr-H2O absorption chillers (single-, double-, and triple-effect) with common solar thermal collectors available on the market. A single-effect chiller is coupled with evacuated tube collectors (ETCs) - SHC1. A double-effect chiller is integrated with parabolic trough collectors (PTCs), linear Fresnel micro-concentrating collectors (MCTs) and evacuated flat plate collectors (EFPCs) respectively - SHC2, SHC3, and SHC4. PTCs are employed to provide high-temperature heat to a triple effect absorption chiller (SHC5). Although triple-effect chillers have been around for a while, this paper represents the first system-level analysis of these chillers coupled with high-temperature solar concentrating collectors for air-conditioning applications. A simulation model for each configuration is developed in a transient system simulation environment (TRNSYS 17). Furthermore, a unique, comprehensive perspective is given by investigating the impact of characteristic solar beam radiation to global radiation ratios on the techno-economic performance of the proposed SHC plants for a wide variety of climatic regions worldwide. The results of parametric study suggest that a storage volume of around 70 L/m(2) is a good choice for SHC1, while 40-50 L/m(2) storage capacity is sufficient for the other configurations (SHC2 to SHC5). The simulation results reveal that when the fraction of direct normal irradiance (DNI) is less than 50%, SHC2, SHC3, and SHC5 require larger collector area compared to SHC1, showing there is no advantage in using concentrating collector powered multi-effect chillers over solar single effect chillers in climates with low DNI level. However, in climates with DNI fractions above 60%, the smallest solar field is achieved by SHC5, followed by SHC2. SHC4, which benefits from both relatively high COP of double-effect chiller and the diffuse component in the solar field, results in the most reasonable trade-off between energetic and economic performance of the system in a wide range of climatic conditions. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本工作基于将三种类型的LiBr-H2O吸收式制冷机（单效，双效和三效）与市场上常见的太阳能集热器相结合，研究了太阳能采暖和制冷（SHC）吸收系统的可行性。单效冷却器与真空管收集器（ETC）-SHC1耦合。双效冷水机分别与SHC2，SHC3和SHC4分别与抛物槽收集器（PTC），线性菲涅耳微浓缩收集器（MCT）和真空平板收集器（EFPC）集成在一起。 PTC用于向三效吸收式制冷机（SHC5）提供高温热量。尽管三效冷水机已经存在了一段时间，但本文代表了这些冷水机以及用于空调应用的高温太阳能聚热收集器的首次系统级分析。在瞬态系统仿真环境（TRNSYS 17）中开发了每种配置的仿真模型。此外，通过研究特征性的太阳光束辐射与全球辐射比对拟议的SHC工厂在全球范围内的各种气候区域的技术经济绩效的影响，给出了独特而全面的观点。参数研究的结果表明，对于SHC1，存储量约为70 L / m（2）是一个不错的选择，而对于其他配置（SHC2至SHC5），40-50 L / m（2）的存储容量已足够。仿真结果表明，当直接法向辐照度（DNI）的比例小于50％时，与SHC1相比，SHC2，SHC3和SHC5需要更大的集热器面积，这表明使用集热器供电的多效冷水机组比使用SHC1没有优势。 DNI低的气候中的太阳能单效冷水机。但是，在DNI分数高于60％的气候中，SHC5实现的太阳能场最小，其次是SHC2。 SHC4既受益于双效冷水机的较高COP，又受益于太阳能领域中的扩散成分，因此在各种气候条件下，系统的能量性能和经济性能之间的最合理平衡。 （C）2016 Elsevier Ltd.保留所有权利。

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