Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Energy Efficiency Analysis of Solar Water Heating Systems Combined With Heat Pumps
Submission Author:
Valquíria Bomfim Fernandes , SC , Brazil
Co-Authors:
Valquíria Bomfim Fernandes, Gabriel Ivan Medina Tapia
Presenter: Valquíria Bomfim Fernandes
doi://10.26678/ABCM.COBEM2019.COB2019-0053
Abstract
This work analyzes the performance of solar water heating systems, applied to large scale domestic consumption in the city of Natal-RN, Brazil. This analysis aims to stimulate the harnessing of solar resource as thermal energy, as a sustainable alternative to electric heating. Two conventional configurations are studied, as well as two configurations combined with heat pumps. The first conventional system contains a single storage tank, whose volume varies according to the area of installed solar collectors, whereas the other three systems have two storage tanks with fixed volume. The combined systems differ from each other in that one of them uses an air-to-water heat pump as an auxiliary heater, while the other relies on a water-to-water heat pump and a bypass valve to connect its two storage tanks. Weather data pertaining to the studied location is implemented in the format of a typical meteorological year (TMY). A methodology for mathematical modeling and transient numerical simulation is applied using the MATLAB software. According to the results, all configurations analyzed in this work prove advantageous. For applications with a reduced area of solar collectors, the combined systems are more effective, whereas the conventional systems show the best performance in cases where a larger area of collectors may be installed.
Keywords
water heating, heat pumps, combined systems, solar thermal energy
