With a considerable volume of contradictory information in circulation regarding the application of different technologies for HVAC systems, this article seeks to explain some of the technical aspects of variable refrigerant flow (VRF) systems, and offer comparisons on the basis of cost and performance to more standard hydronic systems. While some of the material presented here are drawn from industry literature, the majority is drawn from peer-reviewed studies conducted by recognized industry professionals.
Variable refrigerant flow (VRF), also known as variable refrigerant volume, is a system that uses refrigerant, most commonly R-410A, as the working fluid to distribute heat within a building. System output is regulated based on system load, where the refrigerant flow is regulated by electronic expansion valves and variable speed compressors.