When does the majority of heat delivery occur during the gas defrost process?

The majority of heat delivery during the gas defrost process occurs when the gas coming in changes state back into a liquid. This is primarily because, during this phase change, a significant amount of latent heat is released, which is critical for the defrosting process. As gas expands and cools, it absorbs heat from the surroundings, and when it condenses and changes state to a liquid, this process releases the absorbed heat back into the evaporator.

This latent heat release is essential for defrosting in refrigeration systems, as it helps to melt any ice or frost that has formed on the evaporator coil. The effectiveness of the defrost cycle hinges on this thermal exchange, which is optimized when the refrigerant transitions back to a liquid state.

Understanding this process is vital for operators to ensure efficient defrost cycles and maintain system performance.