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This study involves exploring a new design of an internally cooled/heated desiccant contactor by using a new ionic liquid (IL) solution as the sorptive solution. In order to optimize its operative performance, a semitheoretical model based on the principle of minimum energy is developed to predict the film rupture and wetting ability of the IL solution over a comprehensive range of IL mass fraction and flow rates. A first experimental validation of the fundamental equations of the theoretical model is presented and used as a reference to minimize deviations between predicted results and measured data by calibrating dedicated characteristic coefficients. The noteworthy quantitative and qualitative agreement in the whole range of IL mass fractions and flow rates is promising for contributing to the design of optimized system configurations and control strategies.

Abstract. In this paper ionic liquids are proposed as a novel absorbent for absorption refrigeration application with ammonia as refrigerant. The main objective of this work is to develop a measurement setup to study the absorption capacity of the ammonia vapour in ionic liquids in a pool type absorber. This investigation is essential in order to identify the most suitable ionic liquid as an absorbent for ammonia refrigerant. . The absorption processes are observed within 20 minutes in each experiment at different temperatures and pressures. The detail of the methodology and experimental setup are explained in this paper and measurement results of absorption capacity of ammonia into ionic liquid are discussed. Among all ionic liquids studied in this paper [EtOHmim] + based ionic liquids shows higher absorption capacity than [emim] + based ionic liquids, which means that the OH structure in the cation may improve the absorption capacity of ammonia. IntroductionAbsorption refrigeration system is a good known technology. The absorption systems, which can utilize renewable energy such as solar and geothermal energy or waste heat sources such as exhausts of diesel engines and industrial plants to produce cold, carries a primary energy saving, and thus emission reduction. In addition, the absorption systems contain non-HFC and thus, environmentally friendly and becomes a competitive alternative to the conventional vapour compression refrigeration systems. Similar to the compression cycle, absorption cycle is based on the cooling and heating process associated with phase changes of evaporation and condensation of refrigerant fluid at different temperatures and pressures. The working fluid consists of refrigerant and absorbent, so that the boiling temperature can be modified by changing the pressure or composition of the mixture.One of the most common working fluid pair in absorption refrigeration systems is ammonia/water. In this working pair, ammonia works as refrigerant and water as absorbent. The ammonia/water absorption cycle is used mainly for refrigeration purpose, since it can produce cold below 0°C. Being natural fluids, both are emission free and ozone friendly resulting with zero global warming potential (GWP) and ozone depletion potential (ODP). However, the characteristic of water is volatile, thus it is necessary to add an additional component, namely rectifier, to minimize the amount of water entering to the condenser.

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