The temperature rise method of determining air volume can be effectively applied to which type of heating system?

The temperature rise method is particularly effective for a gas-fired furnace because this system relies on the combustion of gas to generate heat, which is then circulated through the air. In this method, the temperature of the air entering the furnace is compared to the temperature of the air leaving it after heating. This temperature difference allows for the calculation of the air volume that has passed through the system as the heat produced is directly related to the gas consumption and the efficiency of the furnace.

Gas-fired furnaces typically provide a consistent and measurable heating output, making it straightforward to apply the temperature rise method. By understanding this temperature difference, technicians can evaluate system performance, ensuring that the furnace is operating efficiently and delivering the appropriate amount of heat into the space. Other systems, such as electric furnaces and heat pumps, can also have their air volumes calculated, but the temperature rise method is not as commonly applied due to differing operational characteristics and heating outputs. Hydronic heating systems primarily circulate hot water rather than air, which makes this method inapplicable to them.