Advanced control of condensing temperature for enhancing the operating efficiency of air-cooled chillers |
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| Affiliation: | 1. Hong Kong Community College, The Hong Kong Polytechnic University, 8 Hung Lok Road, Hung Hom, Hong Kong;2. Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong;1. School of Electrical and Information Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China;2. Beijing Key Laboratory of Intelligent Processing for Building Big Data, Beijing Municipal Science and Technology Commission, Beijing, 100044, China;3. Yatai Construction Science and Technology Consulting Institute CO.,LTD., Beijing, 100044, China |
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| 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. |
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