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

The temperature rise method is a technique used to determine the air volume in heating systems by measuring the temperature difference between the air entering and exiting the furnace. This method is particularly effective for gas-fired furnaces because these systems typically have a consistent and easily measurable temperature change as they heat the air passing through them.

Gas-fired furnaces operate by igniting natural gas, which produces heat that warms the air before it circulates throughout the building. The temperature rise can be directly measured as the air moves from the inlet to the outlet of the furnace. This creates a reliable basis for calculating the total air volume being moved, making the temperature rise method a practical and straightforward approach.

Electric and oil-fired furnaces can also be used in heating applications, but they often have different operational characteristics that may complicate the temperature rise measurement. Electric furnaces, for instance, might not result in a clearly defined temperature rise due to the way they heat air, while oil-fired furnaces can have varying combustion efficiency that affects temperature change. Central air conditioning systems are designed for cooling, and while they involve airflow measurement, the temperature rise method is more suitable for heating scenarios, specifically gas-fired systems.