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Home Service FAQs FAQ of gas-fired(oil-fired) boilers Where is the measurement data for the exhaust temperature of a gas boiler taken?

Where is the measurement data for the exhaust temperature of a gas boiler taken?

26 May 2023

The measurement data for the exhaust temperature of a gas boiler is typically taken at the flue gas outlet or the chimney outlet. This is where the combustion gases exit the boiler and are vented to the outside environment.

 

The temperature measurement is usually taken using a thermocouple or a temperature sensor mounted in the flue gas stream, either directly in the flue pipe or in a sampling probe inserted into the flue gas stream. The measurement should be taken at a point downstream of the boiler heat exchanger and upstream of any heat recovery devices or air pollution control equipment, such as a flue gas desulfurization (FGD) system or a selective catalytic reduction (SCR) system.

 

The exhaust temperature is an important parameter to monitor, as it provides an indication of the efficiency of the boiler combustion process and the potential for heat recovery. High exhaust temperatures may indicate incomplete combustion or heat loss, while low exhaust temperatures may indicate fouling or blockage of the flue gas passages.

 

Regular monitoring and maintenance of the gas boiler combustion system, including measurement of the exhaust temperature, can help to optimize boiler efficiency, reduce fuel consumption, and minimize emissions of pollutants and greenhouse gases.

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