Utilization of waste heat from exhaust gases of gasoline generator for water heating

Abstract

This work presents the application of waste heat from exhaust gases of gasoline generator through a heat exchanger for household water heating. Two cases were experimented. First, was when water was supplied and filled the heat exchanger without discharging through the tap (retained). Second, was when water was continuously supplied to the heat exchanger and continuously discharged through the tap. In both cases, the temperatures of water and exhaust gases were measured. Measurement showed that during one hour of operation, the water temperature increased from 300C to 630C in the first case and from 280C to 490C in the second case. The average mass flow rate of water in the first case, average mass heating rate of water in the second case and average mass flow rate of exhaust gas in the first and second cases were determined to be 0.01 kg/s, 0.044 kg/s, 0.02 kg/s and 0.09 kg/s respectively. The heat gain rate of water in first and second cases were determined to be 1.28 kW and 22.58 kW respectively.