What happens to buoyancy as combustion gas temperatures increase?

As combustion gas temperatures increase, buoyancy increases. This occurs because buoyancy is the upward force that results from the difference in density between the hot combustion gases and the cooler surrounding air.

When combustion gases are heated, they expand and become less dense than the cooler air outside the flue or vent system. This lower density allows the hot gases to rise more effectively. The greater the temperature of the combustion gases, the larger the difference in density between the gases and the surrounding air, thus enhancing the buoyant force. This process is critical in ensuring that combustion byproducts are effectively vented away from the heating system, allowing for proper operation and maintaining safety in the system.

Understanding this relationship is key in the design and operation of heating systems, as it influences the efficiency of venting and overall performance of the system.