If the temperature difference across a duct is increased, what would you expect to happen to the transmission loss?

When the temperature difference across a duct is increased, the transmission loss is expected to increase. This phenomenon occurs because a greater temperature difference enhances the heat transfer between the air inside the duct and the surrounding environment.

In HVAC systems, transmission loss refers to the heat that escapes from the duct into the surrounding space or from the outside environment into the duct, affecting the efficiency of the heating or cooling process. When there is a larger gradient between the temperature of the air inside the duct and the temperature of the surrounding area, the rate of heat transfer increases. This is due to the laws of thermodynamics, which state that heat will always flow from a higher temperature area to a lower temperature area until thermal equilibrium is reached. As a result, the transmission loss becomes greater with an increase in temperature difference, leading to a decrease in the efficiency of the HVAC system.

Thus, the connection between temperature difference and transmission loss is significant, and understanding this relationship is vital for HVAC system design and efficiency management.