EXERGO-ECONOMIC APPROACH TO OPTIMIZE AN AIR TREATMENT UNIT FOR CLIMATE CONTROL OF A COVERED SWIMMING POOL

Autor/autori: F. BOZZINI, P. G. ANOAICA


Abstract: This paper presents the optimization analysis applied to a real case study of the air treatment unit for winter climatization of a covered swimming pool. The optimization is based on exergo- economic approach. This approach had allowed to calculate the exergetic efficiency and exergetic costs before and after optimization of the air treatment unit. The air treatment unit is equipped by a vapor compression heat pump, that is constituted by evaporator heated with exhaust air and condenser cooled with fresh air. This type of heat pump operates at a temperature equal or greater to reference temperature of the dead state (Ta = 268 K). In this case the exergetic flux calculated of the evaporator isn’t outlet, but inlet in the evaporator itself. The optimization consists by introducing in the heat pump cycle, an additional evaporator for heating swimming pool water by increasing the COP of the heat pump itself. The results obtained with exergo-economic analysis are as follows: the exergetic cost per unit of exergy is reduced by 12.5% introducing a sub-cooler. The value of the exergo-economic factor of the heat pump is calculated pre and post optimization cases, growing from 13.2 to 18.2% about 37%. It was obtained improvement of exergy efficiency by 7.6% of the heat pump with a relative increase of its capital cost and the relative difference is reduced by 4%. In conclusion the results obtained have led to aan increase of exergetic efficiency and a consequent reduction of the cost per unit exergy of the air treatment unit

Keywords: climatization, air, optimization, exergy, exergo-economic

 

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