EVI stands for Enhanced Vapor Injection, which is a technology utilized in our low-temperature heat pumps to deliver higher performance in cold climates. EVI allows a 20% increase in refrigerant flow into the evaporator at a lower entry temperature. It incorporates a 3rd smaller internal plate heat exchanger referred to as an "Economizer" in the refrigeration cycle. Some of the refrigerant vapor on the condenser combines with the cooler gas on the expansion side of the evaporator through a bypass valve. This combination leads to the transfer of heat energy, which increases the gas temperature further and is then injected into the head of the scroll compressor through a separate vapor injection port at mid-range pressure. With EVI heat pump technology, the maximum flow temperature limitation of other cold climate heat exchangers is overcome, and more heat is delivered, resulting in a better COP at much lower temperatures. The performance efficiency is increased by 20-30%.
