Title: Energy-efficient operation of two-pipe fan-coil unit system with independent fresh air supply

Authors: J.W. Wan, W.M. Zhang

Addresses: College of Civil Engineering, Guangzhou University, Guangzhou, 510006 China. ' Flack + Kurtz, 405 Howard Street, Suite 500, San Francisco, CA 94105, USA

Abstract: Year-round energy-efficient operation is presented for a two-pipe fan-coil unit air-conditioning system with independent fresh air supply. The study investigated two typical in-room fan-coil operating modes: the dry fan-coil mode in which the room cooling coil does no latent cooling and the wet fan-coil mode in which the room cooling coil is used for dehumidifying a part of moisture from conditioned space. The investigation shows that for a given indoor temperature and relative humidity level, the changeover time of hot-cold water is same in dry fan-coil mode and wet fan-coil mode, but the operating energy consumption required in dry fan-coil mode is more than that required in wet fan-coil mode during the periods of intermediate and summer seasons.

Keywords: two-pipe fan-coil units; energy efficiency; dry fan-coil mode; wet fan-coil mode; changeover time; fresh air supply; air conditioning;dehumidifying; energy consumption; energy conservation.

DOI: 10.1504/IJETP.2009.023209

International Journal of Energy Technology and Policy, 2009 Vol.7 No.1, pp.30 - 45

Published online: 14 Feb 2009 *

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