Central Utilities & Plants


CDH has worked with a range of central chiller and boiler plants to optimize plant efficiency. We have investigated the integration of absorption chilling technologies and other waste heat recovery uses to reduce boiler fuel use and chiller energy and central plant costs. We examine the sequence of operations, fuel sources, and distribution system performance to optimize plant efficiency and cost effectiveness. Opportunities for savings at central plants often are centered around low- and no-cost control or operational improvements. We also evaluate the potential of capital-intensive equipment changes when end-of-life considerations are necessary. We always endeavor to make data-driven evaluations and recommendations that consider the actual loading on these systems, as well as the peak operation and/or planning for future loads.

Example Projects

Monitoring and Energy Analysis of College Chiller Plant – Staten Island, NY

CDH Energy performed monitoring and verification (M&V) of the college's chiller plant. We installed temporary metering equipment in the chiller plant, and collected chilled water flow, supply temperature and return temperature. We analyzed the loads to quantify facility cooling loads, chiller capacity, and efficiency. Using the collected data we determined the daily energy use breakdown, operating patterns, and performance trends for the system.

  Chiller Energy Use     Chiller Efficiency

Chiller Load Assessment at Medical Center – Orangeburg, NY

CDH Energy performed monitoring and verification (M&V) of the medical center's chiller plant. In this evaluation, CDH Energy examined historical utility electric data for the plant and also installed temporary monitoring equipment to gather chilled water flow, supply temperature, and return temperature on the plant secondary chilled water piping. The load data collected was correlated to ambient temperature to determine the peak chilled water load requirement for the campus, as well as the overall load shape. This information was used to better inform the design engineers when selecting individual chiller unit sizing for the upcoming chilled water plant upgrade. The performance data were also used to identify inefficiencies in the secondary loop pumping control, which were resulting in over-pumping and low chilled water system delta T, which were negatively impacting the existing chiller plant performance.

Three Chillers     Cooling Tower     Flow Meter