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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
COMPARATIVE STUDY OF A DIRECTED EXPANSION SOLAR ASSISTED HEAT PUMP USING CAPILLARY TUBES AND THERMOSTATIC EXPANSION VALVE
Submission Author:
André Gonçalves de Oliveira , MG
Co-Authors:
André Gonçalves de Oliveira, Hélio Augusto Goulart Diniz, Willian Moreira Duarte, Luiz Machado, Raphael Nunes Nunes de Oliveira
Presenter: André Gonçalves de Oliveira
doi://10.26678/ABCM.ENCIT2020.CIT20-0068
Abstract
One way to reduce electricity consumption is to use heat pumps assisted by solar energy instead of electricheaters. Several studies were found using solar-assisted heat pumps that use either a thermostatic expansion valve oran electronic expansion valve, but there is a few work on solar-assisted heat pumps using capillary tubes despite the lowcost of this device. In this work, an analysis of the technical and economic feasibility of using the capillary tube willbe performed instead of thermostatic valves in heat pumps assisted by solar energy. In this analysis a lumped modelwill be used for each component of the system. This model was experimentally validated using a direct expansion heatpump assisted by solar energy (DX-SAHP) equipped with a thermostatic expansion valve. The performance of the heatpump will be compared using a thermostatic expansion valve and three capillary tubes for different values of ambienttemperature, solar radiation and wind speed. Finally, a case study will be carried out considering the climatic conditionsand costs in the city of Belo Horizonte, comparing the Payback related to the replacement of electric heaters by heatpumps assisted by solar energy using capillary tubes and thermostatic valves.
Keywords
capillary tube, heat pump, direct expansion, Solar Energy
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