ZEMCH 2015 - International Conference Proceedings | Page 685

International Conference | Bari - Lecce, Italy Session IX DYNAMIC SIMULATION OF A SOLAR COOLING HVAC SYSTEM WITH NANOFLUID Colangelo Gianpiero1, D’Andrea Gerardo2, Franciosa Mariolina3, Milanese Marco4, de Risi Arturo5 1 Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano, 73100 Lecce, Italy, [email protected] 2 Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano, 73100 Lecce, Italy, [email protected] 3 Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano, 73100 Lecce, Italy, [email protected] 4 Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano, 73100 Lecce, Italy, [email protected] 5 Dipartimento di Ingegneria dell’Innovazione, Università del Salento, Via per Arnesano, 73100 Lecce, Italy, [email protected] Abstract Environmental and energy issues are, nowadays, the most debated subjects in science; for this reason, both the proposal of new plant technologies and the increase of renewable energy resources exploitation, are essential. In the last few years, the spread of air conditioning systems has caused overloading of the electricity network system, thus leading to a high risk of power cuts and scientific studies have also shown that refrigerants used in the cooling cycles contribute to global warming. Consequently international scientific research has focused on the development of air conditioning systems with high energy efficiency. The reduction in summer of load peaks on the electricity grid can be obtained by employing thermal solar collectors as heat source in absorption chillers. The cooling system proposed in this study consists of a water-lithium bromide vapor absorption chiller, in which water is used as the refrigerant, while lithium bromide is used as the absorbent. In the absorber, the lithium bromide absorbs the refrigerant, creating a solution of water and lithium bromide. This solution is pumped to the generator where it is heated by solar energy and by an auxiliary boiler, which comes into operation when the temperature of the fluid from the reservoir tank is less than a fixed value. The process of evaporation and condensation of the saline solution produces chilled water, which is sent to fan coil units (FCU). This study wants to investigate the difference between energy provided to the generator by a traditional water flat-plate collector and that by a flat plate collector with nanofluid (colloidal dispersion of 3.0 vol% of Al2O3 nanoparticles in bidistilled water) as working fluid. For the simulation the model has been implemented in TRNSYS environment. The great advantage of this program is that it allows detailed energy analyses of all the components of the system. Keywords Solar cooling system, nanofluid solar collector, water-lithium bromide vapor absorption chiller, TRNSYS. 683