Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
INFLUENCE OF FLOW RATE AND TEMPERATURES ON THE THERMAL EFFICIENCY OF FLAT PLATE SOLAR COLLECTORS
Submission Author:
Janaína de Oliveira Castro Silva , MG
Co-Authors:
Cristiana Brasil Maia, Janaína de Oliveira Castro Silva, Antonia Sonia Cardoso Diniz, André Guimarães Ferreira
Presenter: Janaína de Oliveira Castro Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0573
Abstract
Thermal efficiency is often used as one of the most important parameters for the comparison of flat solar collectors. It depends on the physical and geometrical parameters of the collector and of the heat loss to the environment. The efficiency is determined in the thermal performance test, in which solar radiation, the water flow rate, ambient temperature, and inlet and outlet water temperatures are measured. In this work, we intend to evaluate the influence of flow rate, ambient temperature and inlet temperature on the average annual efficiency of a solar collector. A mathematical model to determine the solar radiation absorbed by the collector and the outlet temperature of the water to the city of Belo Horizonte was developed. With these parameters, it was possible to determine the instantaneous collector efficiency. Efficiency was evaluated for the 24 hours of the day, for 365 days of the year. It was observed that the efficiency increases with the flow rate and ambient temperature and decreases with temperature water inlet.
Keywords
Solar Collector, Efficiency, Environmental parameters
