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VFD Driven Centrifugal Chiller - Two Case Studies with Positive and Negative ROI


Adding VFDs on centrifugal chillers is often recommended as a good energy conservation measure. In my presentation I will present two case studies, one with favorable ROI and second with not favorable ROI.

In first case study adding VFD resulted in 4.2 year payback for customer.

In second case, customer contemplated to add a VFDs to two 400 Ton chillers.
DC SEU analysis showed that this ECM would have simple payback of 26 years and based on my recommendation customer with to pursue this upgrade.

Presented By

Nikola Jovic
Energy Consultant

Nikola Jovic is an Energy Consultant for the Vermont Energy Investment Corporation. VEIC works with a number of outstanding partners who contract with them to bring their energy efficiency goals to life: The DC Sustainable Energy Utility, Efficiency Vermont, and Efficiency Smart are energy efficiency programs administered by VEIC. The DC Sustainable Energy Utility (DC SEU) was established in 2011 and since then it has delivered financial incentives, technical assistance, and information to tens of thousands of District residents and businesses. Nikola provides technical assistance to commercial and residential customers and works with DC SEU clients to identify and implement energy and water savings opportunities. Nikola has worked as an Energy Consultant and Solar Designer for more than 6 years and is AEE certified as an Energy Manager (CEM) and Measurement and Verification Professional (CMVP). Nikola is a graduate of the University of the District of Columbia with a BS in Electrical Engineering