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Study of environmentally friendly working mixtures containing ionic liquids for absorption heat transformers

Abstract : Recently, the cost and use of energy continually rise. Hence, humans are close to face serious environmental problems such as increasing CO2 discharges. In this regard, global community is to achieve the ambitious objective of reducing carbon footprint and to ensure that the heating demand is covered in a sustainable manner. Since, enormous amounts of low-temperature waste heat are released on daily bases from many industrial plants to the atmosphere at temperatures between 60 - 100°C. Absorption heat transformers (AHT) are interesting because they can recover low temperature waste heat from different industrial activities and renewable energy sources such as solar and geothermal. AHT can be used to upgrade waste heat to produce useful heat for heating and hot water supplies. Nowadays, the standard working pairs used for AHTs are {ammonia + water} and {water + lithium bromide}. However, both of the working pairs show questionable behavior such as toxicity, crystallization and corrosiveness. Therefore, exploring new working pairs which do not exhibit limitations become of great importance. This work includes an investigation to analyze the AHT systems using {water + ionic liquids} binary systems as working fluids. First, basic thermodynamic properties including vapor pressure, density, heat capacity as well as excess enthalpy of these binary systems were measured at various temperatures with different ionic liquid concentrations. The thermodynamic properties data were correlated by different equations, respectively. The correlated values were significantly consistent with the experimental data. Next, simulation of the AHT performance based on the thermodynamic properties of the new working pairs and on the mass and energy balance for each component of the system were performed. Results show that the {H2O + ILs} binary systems are promising alternatives to replace the already used {H2O + LiBr} working pairs
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Submitted on : Thursday, March 29, 2018 - 1:24:51 PM
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El Shaimaa Talaat Yussef Abumandour. Study of environmentally friendly working mixtures containing ionic liquids for absorption heat transformers. Food and Nutrition. Université de Lorraine, 2015. English. ⟨NNT : 2015LORR0070⟩. ⟨tel-01751700⟩



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