Theoretical Analysis of Annular Elliptic Finned Tube Evaporative Condenser Based on Field Measurement
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https://doi.org/10.1007/s11630-020-1354-7
Article ID: 1003-2169(2020)00-0000-00
Theoretical Analysis of Annular Elliptic Finned Tube Evaporative Condenser Based on Field Measurement GU Yaxiu1, WANG Junwei1, WANG Xinru2*, LI Mohua1, PAN Song3*, LIU Guangdong1, WANG Wentao1, GONG Zexiang1 1. Department of Building Environment and Energy Engineering, School of Civil Engineering, Chang’an University, Xi’an 710061, China 2. Research Centre for Fluid and Thermal Engineering, Department of Architectural and Built Environment, University of Nottingham Ningbo China, Ningbo 315100, China 3. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: In this article, a new evaporative condenser with an annular elliptic finned tube heat exchanger that includes a round inner tube and elliptic outer finned tube was designed and analyzed. The refrigerant flows between the round inner tube and the elliptic outer tube, and it simultaneously exchanges heat with the cooling water in the inner tube, the spray water, and the cooling air flowing past the outer tube. Using field measurement for the traditional round finned tube evaporative condenser in the Futong Metro Station of Line 14 in Beijing, China, the theoretical heat transfer performance of the annular elliptic finned tube evaporative condenser was analyzed and simulated. Compared with a round finned tube heat exchanger, the heat exchange capacity of the annular elliptic finned tube increased by 2.34% to 9.28%; the total heat transfer coefficient increased by 47.42%, and the power consumption of the fan in the air-conditioning system with an annular elliptic finned tube heat exchanger decreased by 11.18% to 14.65%. Therefore, the energy-saving performance and the heat transfer performance of the new annular elliptic finned tube heat exchanger were enhanced compared to the round finned tube heat exchanger.
Keywords: evaporative condenser, finned tube heat exchanger, annular elliptic tube, heat transfer enhancement, air-conditioning system, metro station
1. Introduction An evaporative condenser is a combination of an air-cooled and a water-cooled condenser. The condensing temperature of the air-cooled condenser is greatly affected by the outdoor temperature and is 5°C to 10°C higher than that of an evaporative condenser [1, 2]. A Received: Feb 15, 2020 AE: BOETCHER Sandra
water-cooled condenser has a lower condensing temperature than an evaporative condenser, but it uses more cooling water. As a result, the water pump consumes more energy [3]. A refrigeration system with an evaporative condenser can provide energy savings of 16% compared with a refrigeration system with an air-cooled condenser [4].
Corresponding author: WANG Xinru; PAN Song
E-mail: [email protected]; [email protected] www.springerlink.com
2
The thermal performance of evaporative condensers has been studied through experim
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