Distributed Pumping Chilled Water Hydronic System for Air-conditioning Systems

Coil pumping strategy is known to be the best solution for systems serving large air handling units (Taylor, July 2011). A Primary-Coil Secondary (P-CS) system is also introduced in the past (EDR, 2009) which uses a coil pump at the AHU's and primary pump in the chiller plant. Recent improvement in efficiency of low flow high head pumps with variable speed drives have made using a P-CS type configuration more economical viable. This article provides the results of application of a Primary-Coil Secondary pumping system to a small commercial building.