Exergy Analyses and Modelling of a Novel Extra-Low Temperature Dedicated Outdoor Air System

Yani Bao, Wai Ling Lee and Jie Jia
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Yani Bao: Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Wai Ling Lee: Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Jie Jia: Department of Built Environment and Energy Utilization Engineering, Taiyuan University of Technology; Taiyuan 030024, China

Energies, 2018, vol. 11, issue 5, 1-25

Abstract: A novel dedicated outdoor air system (DOAS) comprising a multi-stage direct expansion coil to produce extra-low temperature (XT) outdoor air to handle the entire space cooling demand has been confirmed more efficient than conventional systems. To further enhance the performance of XT-DOAS, the optimum number of cooling stages and treated outdoor air temperature need to be determined. This process requires the development of a coil performance model that takes into account the extra-high and extra-low entering air temperatures at the first and the last cooling stages. In this study, factory test data and field measurement data were used to develop such a performance model. Different statistical analyses were employed to validate the developed model. Based on the developed model, energy and exergy analyses were conducted to evaluate use of XT-DOAS for space cooling of a typical office building in Hong Kong. EnergyPlus was employed for the energy analysis. The laws of thermodynamics were used for the exergy analysis. Their combined results indicate that for better energy efficiency and performance for air-conditioning of office buildings in subtropical region, the optimum configuration for XT-DOAS is two cooling stages with a treated outdoor air temperature of 7 °C. The model developed and the energy and exergy analyses described will contribute significantly to future research in this area.

Keywords: extra-low temperature outdoor air system; coil performance model; system configuration; energy and exergy performance analyses; subtropical office buildings (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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