Why Reverse Cycle Systems Lose Efficiency
From day 1, every reverse cycle system starts losing some of its energy efficiency. This happens through no fault of your own, it has nothing to do with how much you paid for your system, the brand you have or how often you have it serviced.
ASHRAE, the international technical society organized to advance the arts and science of H.V.A.C. (Heating, Ventilation, Air Conditioning & Refrigeration) have confirmed, after decades of studies, that the typical reverse cycle system will lose about 7% of its energy efficiency within the first year of operation, 5% the second year and a further 2% per year thereafter, up to a total of about 30%.
These efficiency losses are due to the effects of oil fouling which occurs from the very first moment of your systems operation. Oil fouling is the accumulation of unwanted oil deposits in the coil system of all reverse cycle air conditioning systems, regardless of refrigerant type.
During the refrigeration compression process that takes place within a reverse cycle system, the systems very own lubricating oil migrates from the air conditioning motor/compressor to the coil system of the condenser and evaporator contaminating the metals that transfer heat. This layer on non conductive material creates a Laminar Friction causing the refrigerant to travel like a bullet with a sharp point which drives up energy use, increases wear and tear, shortens the life of your system and reduces comfort.