Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16332
Title: Advanced control of condensing temperature for enhancing the operating efficiency of air-cooled chillers
Authors: Yu, FW
Chan, KT 
Keywords: Air-cooled chiller
Condenser fans
Condensing temperature
Efficiency
Issue Date: 2005
Publisher: Pergamon Press
Source: Building and environment, 2005, v. 40, no. 6, p. 727-737 How to cite?
Journal: Building and environment 
Abstract: Air-cooled chillers are commonly used to provide cooling energy in commercial buildings in the subtropical climate. These chillers have long been considered inefficient because they operate under head pressure control where the condensing temperature is kept high in the refrigeration cycle. This paper considers a novel method to strategically lower the condensing temperature to enhance chiller efficiency at any outdoor temperature. An experiment is carried out on an air-cooled reciprocating chiller to confirm that an electronic expansion valve enables refrigerant to be adequately fed into the evaporator in all operating conditions, even when the condensing temperature falls to around 20 °C. By enhancing the heat rejection airflow of the condenser, both the condensing temperature and chiller power can decrease considerably with less fluctuation. According to the algorithm of staging condenser fans, this enhancement corresponds to resetting the set point of the condensing temperature based on any outdoor temperature. The potential and benefits of implementing this reset strategy are discussed.
URI: http://hdl.handle.net/10397/16332
ISSN: 0360-1323
EISSN: 1873-684X
DOI: 10.1016/j.buildenv.2004.08.017
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