Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
ENERGY ANALYSIS OF A HYBRID SOLAR/GAS SYSTEM FOR WATER HEATING: A CASE STUDY
Submission Author:
Olinto Evaristo , PB
Co-Authors:
Olinto Evaristo, Joao Alves de Lima, Jesus Medeiros
Presenter: Olinto Evaristo
doi://10.26678/ABCM.COBEM2021.COB2021-1488
Abstract
Solar water heating represents an environmentally clean technology, with an abundant, permanent and renewable energy source, which does not pollute or harm the ecosystem. The correct use of this type of system is translated into a significant reduction in electric energy consumption. This work was conceived due to the difficulties observed in the monitoring, operation and maintenance of a hybrid heating system (solar/gas) of water in a residential building in the city of João Pessoa/PB in Brazil. To fix a problem of excessive pressure increase in hot and cold water pipes, the original design configuration (2013), in which the system recirculated the water from the building plume when the temperature falls to a certain value, was modified to a configuration where the water from the plume is diverted to the cistern (2019, without recirculation). In addition to this modification, the auxiliary system heating fuel in the original project, which was LPG (liquefied petroleum gas), was replaced by natural gas (NG). The preliminary results, obtained via the F-Chart method, show that, as expected, the performance of the system has decreased, causing a higher consumption of hot water and gas (due to the higher demand and lower calorific value of NG in relation to LPG).
Keywords
Solar Energy, water heating, solar fraction
