Economic benefits of optimal control for water-cooled chiller systems serving hotels in a subtropical climate |
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Authors: | FW Yu KT Chan |
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Affiliation: | a Hong Kong Community College, The Hong Kong Polytechnic University, Hong Kong, China b Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
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Abstract: | A water-cooled chiller system in an air-conditioned hotel can take up about one-quarter of the total electricity consumption and considerable amounts of water in the heat rejection process. This paper evaluates operating cost savings of a chiller system integrated with optimal control of cooling towers and condenser water pumps. A sophisticated chiller system model was used to ascertain how different control methods influence the annual electricity and water consumption of chillers operating for the cooling load profile of a reference hotel. It is estimated that applying load-based speed control to the cooling tower fans and condenser water pumps could reduce the annual system electricity use by 8.6% and operating cost by 9.9% relative to the equivalent system using constant speed fans and pumps with a fixed set point of 29.4 °C for cooling water temperature control. The ways to implement this advanced control for system optimization are discussed. |
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Keywords: | Water-cooled chiller Cooling tower Economic analysis Optimum control |
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