Optimum Heat Source Temperature and Performance Comparison of LiCl–H2O and LiBr–H2O Type Solar Cooling System

Abstract

This comprehensive investigation has been executed to compare the thermodynamic performance and optimization of LiCl–H2O and LiBr–H2O type absorption system integrated with flat-plate collectors (FPC), parabolic-trough collectors (PTC), evacuated-tube collectors (ETC), and compound parabolic collectors (CPC). A model of 10 kW is analyzed in engineering equation solver (ees) from thermodynamic perspectives. Solar collectors are integrated with a storage tank which fueled the LiCl–H2O and LiBr–H2O vapor absorption system to produce refrigeration at 7 °C in evaporator for Gujarat Region of India. The main objective includes the evaluation and optimization of critical performance and design parameters to exhibit the best working fluid pair and collector type. Optimum heat source temperature corresponding to energetic and exergetic aspects for LiCl–H2O pair is lower than that of LiBr–H2O pair for all collectors. Simulation shows that FPC has lowest capital cost, exergetic performance wise PTC is optimum, and ETC requires lowest collector area. On the basis of overall evaluation, solar absorption cooling systems are better to be powered by ETC with LiCl–H2O working fluid pair.

Preparation of Multilayer Microcapsules Encapsulating Aqueous Lithium Bromide and Their Mechanical Stability

“…3 Whereas, in organic synthesis, lithium halides have been often employed as a catalyst 4 or as a lewis acid 5 or as a source of bromine in nucleophilic substitution 6 and addition reactions. 7 Recently, LiCl and LiBr as the consequences of their highly hydroscopic properties 8,9 have been increasingly used as desiccants for absorption cooling systems such as air conditioners (ACs) for the utilisation and conversion of low grade waste heat and renewable energy. [10][11][12] In a typical adsorption AC, water is often used as the refrigerant and lithium salt (either chloride or bromide) as the desiccant.…”

“…Lithium halides (bromide and chloride) have been widely used in a variety of applications which include medicinal − and organic synthesis. − In medicine, lithium halides especially lithium bromide (LiBr) have previously been used in clinical psychopharmacology as a hypnotic drug in the late 19th and early twentieth centuries. − In addition, LiBr was one of the first compounds regularly employed as an antianxiety agent, whereas, in organic synthesis, lithium halides have been often employed as a catalyst or as a Lewis acid or as a source of bromine in nucleophilic substitution and addition reactions . Recently, LiCl and LiBr as a consequence of their highly hydroscopic properties , have been increasingly used as desiccants for absorption cooling systems such as air conditioners (ACs) for the utilization and conversion of low grade waste heat and renewable energy. − …”

Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchangers in a Solid Sorption Chiller

“…Therefore, a new composite with high stability was developed by impregnating LiCl into pores of mesoporous WSS [22]. LiCl is usually used as the liquid desiccant [23][24][25] or liquid absorption chiller [26,27]; its higher exergetic efficiency and long-term stability [28] is thought to be suitable as the other main component of the composite sorbent for a sorption chiller. For the prototype of the sorbent packed sorption cooler built in our previous research [29], the WSS + 40 wt.…”