Electronic vapor injection (EVI) is used in the refrigeration system of a Hydron-Aire EVi air-to-water heat pump. It’s this technology that allows it to run efficiently in cold climates. Here’s how EVI works in a refrigeration system in cold climates:
- A refrigerant economizer heat exchanger with its own electronic expansion valve actively controls the refrigerant superheat and subcooling to prevent liquid refrigerant from entering the compressor at extremely cold temperatures.
- The heat pump’s compressor has two suction inlets instead of one. In low temperatures, a portion of refrigerant gas is reinjected into the second compressor connection to lower the total pressure difference the compressor must work against.
- Our system uses a variable-speed compressor to adjust the refrigerant flow rate to maintain performance in extremely cold temperatures.
The Weather Network wrote this article about running a heat pump in northern climates.
Overall, an EVI refrigeration system in cold climates can provide more precise control over the temperature and reduce energy consumption compared to a traditional refrigeration system. These additional components ensure it runs reliably all year long.