Study of environmentally friendly working mixtures containing ionic liquids for absorption heat transformers
Description
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 deg. 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. (author)
Abstract (French)
Ces dernieres annees, les couts et la demande en energie n'ont cesse d'augmenter. Par consequent, l'humanite fait face a de graves menaces environnementales telles que l'augmentation des rejets de CO2. A cet egard, la communaute internationale doit parvenir a reduire de son empreinte carbone et a veiller a ce que les besoins en energie thermique soient couverts de maniere durable. D'importantes quantites de chaleur residuaire a basse temperature (60 - 100 deg. C) sont liberees quotidiennement dans l'atmosphere par de nombreuses installations industrielles. Les thermo-transformateurs de chaleur a absorption constituent un outil interessant car ils peuvent revaloriser des chaleurs residuaires pour produire de la chaleur utile pour le chauffage et la production d'eau chaude. Actuellement, les melanges de travail utilises dans les pompes a absorption sont les systemes [ammoniac + eau] et [eau + bromure de lithium]. Cependant, ces deux fluides de travail presentent certains inconvenients tels que la toxicite, la cristallisation et la corrosivite. Par consequent, il est important de rechercher de nouveaux melanges de travail. Cette etude a pour objectif d'evaluer l'interet d'utiliser des melanges constitues de liquides ioniques et d'eau au sein de thermo-transformateurs a absorption. Tout d'abord, les proprietes thermodynamiques de ces systemes binaires (pression de vapeur, densite, capacite thermique et enthalpie d'exces) ont ete mesurees dans un large domaine de temperature et de composition. Ces donnees experimentales ont ete correlees a l'aide de modeles thermodynamiques adequats. Ensuite, les performances de ces fluides de travail ont ete evaluees. Les resultats montrent que les systemes binaires [H2O + LIs] sont une alternative prometteuse aux fluides de travail traditionnels tels que [H2O + LiBr]. (auteur)
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Additional details
Additional titles
- Original title (English)
- Etude de melanges de travail verts contenant des liquides ioniques pour les thermo-transformateurs a absorption
Publishing Information
- Imprint Pagination
- 193 p.
- Report number
- FRNC-TH--13535
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 53119412
- Subject category
- S42: ENGINEERING;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- ABSORPTION HEAT; ABSORPTION REFRIGERATION CYCLE; BINARY MIXTURES; COEFFICIENT OF PERFORMANCE; DENSITY; HEAT PUMPS; MOLTEN SALTS; SPECIFIC HEAT; SURFACE TENSION; THERMAL DEGRADATION; TOXICITY; VAPOR PRESSURE; VISCOSITY; WATER; WORKING FLUIDS
- Descriptors DEC
- DISPERSIONS; ENERGY; ENTHALPY; FLUIDS; HEAT; HYDROGEN COMPOUNDS; MIXTURES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SALTS; SURFACE PROPERTIES; THERMODYNAMIC CYCLES; THERMODYNAMIC PROPERTIES
Optional Information
- Notes
- 206 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses