Study on thermal efficiency of gas-fired vacuum hot water boiler

Gas-fired vacuum hot water boiler with the advantages of high thermal efficiency, energy-saving and environmental protection, thus has the widespread market prospect. In this paper, Thermal efficiency of gas-fired vacuum hot water boiler with an exhaust heat recovery device is researched by thermal efficiency test principle and experimental mensuration. The methods of direct balance and inverse balance are applied to calculating the thermal efficiency of vacuum hot water boiler. The thermal efficiency of boiler with direct balance method is 95.85%, while inverse balance method is 94.70%, The difference of two in 5% meets requirement. The research results show that the thermal efficiency of gas-fired vacuum hot water boiler with an exhaust heat recovery device is very high and can achieve 95%. greatly improving the utilization of the fuel.