Variable Primary Flow (VPF)

Increased attention towards reducing energy consumption by air conditioning systems, linked with the search for savings in plant operating costs and the need to reduce CO₂ emissions, is encouraging builders and designers to examine new and alternative system solutions.
Within the scope of hydronic air conditioning, the innovations most often analysed include variable primary flow systems (VPF); the development of such systems has been made possible thanks to the technological advancement of variable speed pumps and the implementation of increasingly advanced control logics to manage modulating chillers.
The additional energy and cost savings associated with variable primary flow mean that the performance of already efficient plants can be improved, representing an energy efficiency measure that generally does not involve particular financial overheads.