EUROSUN 2010 - LATENT HEAT STORAGE INTEGRATION TO A SOLAR COOLING SYSTEM CONDENSER

摘要

Conventional sorption based solar cooling systems require a wet cooling tower (to dissipate the heat at condenser) which slows down their commercial development for small and mid range systems (<30 kW) because of a restrictive maintenance against Legionellosis risks (mainly in France and Spain). To substitute wet cooling technology by dry air cooling one generates furthers electricity consumptions (30%) and make the cooling process less efficient during hot days with high ambient temperatures [1]. The purpose of the SOLACLIM research project is to study the addition to a drycooler (dry air cooling by fans), of a latent heat based storage tank filled with a Phase Change Material (PCM) intensified in thermal conductivity by impregnation in a Compressed Expanded Natural Graphite (CENG) matrix [2]. During the day, the heat, rejected by the sorption chiller and not dissipated by the drycooler, is absorbed by the composite which is in charging process. The sorption chiller can be still cooled down despite of high ambient temperatures. During the night, the stored heat is released taking advantage of both a cooler ambient temperature and a cheaper night-time electricity. This combination has been studied on a pre-commercial facility using an inorganic hydrated salt and first results have been exposed and discussed.