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Performance analysis of the refrigerant-cooling radiant terminal: A numerical simulation

Jiang, T; You, S; Wu, Z; Zhang, H; Wang, Y; Wei, S; (2021) Performance analysis of the refrigerant-cooling radiant terminal: A numerical simulation. Applied Thermal Engineering , 197 , Article 117395. 10.1016/j.applthermaleng.2021.117395. Green open access

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Abstract

The existing radiant cooling systems have the drawback of low energy efficiency due to its secondary heat exchange via chilled water. To overcome this dilemma, a novel refrigerant-cooling radiant terminal (RCRT) system utilizing the refrigerant as direct medium is proposed. A detailed numerical model is established to describe the heat transfer characteristics of this system and validated with the experimental data. The influences of the operating parameters and indoor ambient parameters on thermal performance of the RCRT system are analyzed based on the numerical model. Results show that the proportion of sensible, latent and radiant cooling capacity of this system is 55.5%, 17.3% and 27.2%, respectively, which indicates that natural convection is the main contributor in the heat transfer process. Additionally, a method for design parameters determination of the RCRT system is provided and a simplified characteristic equation is proposed to conveniently evaluate the cooling performance of this system in engineering application. The comparisons of cooling performance are conducted by an assessment index between the RCRT system and other cooling systems. Results show that the cooling capacity per unit projected area of the RCRT system is superior to chilled water radiant cooling systems, while inferior to forced-convection air-conditioning systems.

Type: Article
Title: Performance analysis of the refrigerant-cooling radiant terminal: A numerical simulation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.applthermaleng.2021.117395
Publisher version: https://doi.org/10.1016/j.applthermaleng.2021.1173...
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-cooling radiant terminal; numerical model; heat transfer characteristics; design parameters determination; characteristic equation
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/10132421
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