What impact do non-condensables have on system efficiency?

Non-condensables in an HVAC system, such as air or other gases that do not change state under the operating conditions, can significantly decrease the overall efficiency of the system. These substances can accumulate in the condenser, preventing the effective transfer of heat. This leads to an increased pressure within the system, requiring the compressor to work harder to achieve the desired cooling effect. The additional workload on the compressor results in higher energy consumption, which ultimately reduces the system's efficiency.

Additionally, non-condensables can disrupt the refrigeration cycle by altering the pressure/temperature balance, causing inconsistent cooling. This inefficiency not only impacts performance but can also lead to greater wear and tear on system components, potentially resulting in more frequent maintenance or breakdowns. Therefore, maintaining a clean and properly evacuated system free of non-condensables is crucial for optimizing efficiency.