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Multi-objective optimization of the refrigerant-direct convective-radiant cooling system considering the thermal and economic performances

Jiang, T; You, S; Wu, Z; Zhang, H; Wang, Y; Wei, S; (2022) Multi-objective optimization of the refrigerant-direct convective-radiant cooling system considering the thermal and economic performances. Energy and Buildings , 254 , Article 111609. 10.1016/j.enbuild.2021.111609. Green open access

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Abstract

The refrigerant-direct convective-radiant cooling (RCC) system is attracting widespread concern due to its advantages of good thermal comfort, high energy efficiency and simple structure. However, researches on thermal and economic optimization of this system are rare. In this study, a novel heuristic approach is proposed to optimize the aluminum column-wing type refrigerant-direct convective-radiant cooling (ACT-RCC) system, which adopts artificial neural network (ANN) integrated with multi-objective genetic algorithm (MOGA). The numerical and economic models of the ACT-RCC terminal are developed and the numerical model is validated by the experimental data. Besides, the ANN model is adopted to accelerate the prediction of the thermal and economic performances of this system. Results show that the training values of the ANN model are fitted well with simulated results and the ANN model can greatly improve the runtime in comparison with original numerical and economic models. Based on the heuristic optimization approach, the optimal structure of the ACT-RCC terminal is the copper pipe diameter with 8.7 mm, copper pipe spacing with 25.5 mm and rib height with 30.3 mm. Compared with original structure, the cooling capacity of the improved ACT-RCC system is enhanced by 16.0% and the initial cost is reduced by 10.0%. The appearance area equals to the direct product of the length and width, and results show that the appearance area of the improved ACT-RCC terminal is decreased from 1.04 m2 to 0.78 m2. Therefore, the proposed heuristic approach provides guidance for improving the thermal and economic performances of the RCC systems.

Type: Article
Title: Multi-objective optimization of the refrigerant-direct convective-radiant cooling system considering the thermal and economic performances
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.enbuild.2021.111609
Publisher version: https://doi.org/10.1016/j.enbuild.2021.111609
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: refrigerant-direct convective-radiant cooling system, thermal and economic optimization, artificial neural network, multi-objective genetic algorithm
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10137440
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