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Concentrating solar thermal desalination: performance limitation analysis and possible pathways for improvement
Applied Thermal Engineering ( IF 6.4 ) Pub Date : 2020-11-21 , DOI: 10.1016/j.applthermaleng.2020.116292
Yanjie Zheng , Rodrigo Caceres Gonzalez , Marta C. Hatzell , Kelsey B. Hatzell

Solar thermal desalination is a viable approach for sustainable water production. Current thermal desalination technologies suffer from high specific energy consumption and energy mismatch. Concentrating solar collectors operate with high temperature energy and desalination systems operate with low temperature energy which leads to large exergy destruction. Herein, a thermodynamic model of an ideal concentrating solar-distillation process is developed to evaluate system integration and performance limitations (specific water production). Three different heating architectures are examined to understand how solar collector absorber temperature, concentration ratio, and recovery ratio impact system performance. A reversible solar distillation system operating with a concentration ratio of 10 at the optimal absorber temperature of 507K can achieve a maximum specific water production of 166.3 gs-1m-2 as the recovery ratio (rr) approaches zero. An endo-reversible heat engine model was formulated to consider system irreversibilities. Systems with irreversibilities (R=0.001 K/kW or 0.005 K/kW) experience a decrease in the water production rate to 8.8 g s-1m-2 (rr= 51.4%) and 1.9 g s-1m-2 (rr= 65.2%). For efficient integration of solar collectors with thermal desalination systems it is critical to adopt appropriate heating configurations and control absorber temperatures, system recovery ratio, and system irreversibilities.



中文翻译:

集中太阳能热脱盐:性能限制分析和可能的改进途径

太阳能热脱盐是可持续水生产的可行方法。当前的热脱盐技术遭受高比能耗和能量失配的困扰。聚光太阳能收集器以高温能量运行,而脱盐系统以低温能量运行,这会导致较大的火用破坏。在此,开发了理想的集中式太阳能蒸馏过程的热力学模型,以评估系统集成度和性能限制(特定的水产量)。研究了三种不同的加热架构,以了解太阳能收集器吸收器的温度,聚集比和回收率如何影响系统性能。随着回收率(rr)接近零,达到166.3 gs -1 m -2。建立了内可逆热机模型来考虑系统不可逆性。具有不可逆性(R = 0.001 K / kW或0.005 K / kW)的系统的产水率降低到8.8 gs -1 m -2rr = 51.4%)和1.9 gs -1 m -2rr = 65.2) %)。为了将太阳能集热器与热脱盐系统有效集成,采用适当的加热配置并控制吸收器温度,系统回收率和系统不可逆性至关重要。

更新日期:2020-11-21
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