Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
IMPROVEMENTS IN THERMAL EFFICIENCY FOR MODIFIED GEOMETRY IN COMMERCIAL COOK-TOP BURNERS (LPG FUEL)
Submission Author:
Robson Leal da Silva , MS , Brazil
Co-Authors:
Bruno Viscardi Sant Ana
Presenter: Robson Leal da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0705
Abstract
This paper presents experimental results for domestic gas burners, operating on LPG – Liquefied Petroleum Gas, with modification in its original geometry commercially available. The main objective is to identify improvements in performance when evaluating changes in its geometry for LPG passage (end-holes diameter, radial and axial positions) at differente thermal power conditions (TP1 up to TP5). Considering the large number of cooker-top burners currently being used, even a slight improvement in thermal performance resulting from a better design and/or operational condition will lead to a significant reduction of energy consumption and costs for the final user. The methodology applied was based on regulations from INMETRO – National Institute for Metrology, Quality and Technology via CONPET program for energy conversion efficiency in cooktop and kilns, ABNT – Brazilian Society for Standard Normatives (testing of household gas burning devices) and ANP – National Agency of Petroleum, Natural Gas, and Biofuels. Appropriate instrumentation was used to measure fuel mass consumption (weighing scale and chronometer), temperature (thermocouple, K type) and water mass (weighing scale) in the heating vessel. The results obtained are analyzed and discussed when varying Thermal Power (kW), for each combination of fuel mass rates (kg/s), Reynolds number (Re, dimensionless), thermal efficiency (η, %) and ∆Twater for a standard vessel and time (°C/s). The main findings are: a) Maximum and minimum TP are, respectivelly, for B-30 and B-10; b) Original burner has the worst efficiency in comparison to the modified ones; c) As Reynolds increases, efficiency for B20 and B-30 also increases, until it reaches its maximum and then, it drops for higher Reynolds values and the opposite for B-00 and B-10.
Keywords
energy efficiency, gas cooker, Firing rate, Labelling programs, Combustion
