Projeto e dimensionamento de sistema de climatização comercial utilizando resfriamento geotérmico

Abstract

The prospects of obtaining and use of electricity, taking into account the various technical and environmental constraints require new models, not only in generation but mainly consumption. In this context, the HVAC sector, which has great contribution in the energy matrix, including Brazil (representing 10% of total consumption of commercial and residential sectors), presents itself as an opportunity for improvement. In this sense, the cooling geothermal systems are shown with an alternative technology, much studied and already applied in the United States and Europe, more sustainable than conventional systems. In this paper we sought an innovative and appropriate configuration for the Brazilian reality of a geothermal cooling system, which uses the ground as a heat sink for a typical commercial building in the city of Curitiba, comparing thermal, results of operations, and energy costs and evaluating the viability compared to a conventional HVAC system type Split. The adopted configuration allied with cold- beam technology at a geothermal exchanger water-land, consisting of PVC tubes in an array of two layers. This yields savings of approximately 42% in electricity consumption, but the initial cost of deployment presented amortization of 13 years. As a point of improvement, ultimately geothermal heat exchanger ground- water was replaced by a water-water heat exchanger in a well thus yielding a more compact solution with a slight reduction in costs.