Article (Scientific journals)
Thermal performance analysis of an existing building heating based on a novel active phase change heater
Zhang, Zhaoli; Zhang, Nan; Yuan, Yanping et al.
2023In Energy and Buildings, 278, p. 112646
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Keywords :
Phase change material; Building heating; Temperature control; Finite element method; Heat transfer characteristic
Abstract :
[en] An active phase change heater is configurated to transform excess electricity at off-peak tariff periods into thermal energy, store and release it at the electricity on-peak tariff periods to accomplish heating demand towards an existing building with marine climate. A reliable numerical model is developed based on phase change heat transfer and convective heat transfer between phase change material (PCM) and indoor air. The objective temperature zone (18—24 °C) is achieved using an event control that is coupled with a heat transfer model. Performance of indoor temperature, phase change characteris- tics and operating model of active phase change heaters during the building heating period are comprehensively evaluated. Results indicate that indoor temperatures are generally within the thermal comfort range under various initial temperatures and air inlet velocities. Start-stop frequencies of PCM system increase while total working times decrease with the augment of air velocity. Liquid fractions of PCM decrease as studied time elapses, and several parallel stages occur owing to intermittent operation of active phase change heaters. Parametric analysis reveals that thermal resistance is determined as the most decisive factor, followed by ambient temperature, PCM melting point, and PCM thermal conductivity. The liquid fraction of PCMs declines to merely 0.074 when thermal resistance increases to 0.4 (m2 oC)/W. In conclusion, the studied results highlight the correlation between building thermal performance and specific heat transfer characteristics of PCM, with substantial benefits to the development of latent heat thermal energy storage available for building energy conservation.
Research center :
Sustainable Building Design Lab
Disciplines :
Architecture
Author, co-author :
Zhang, Zhaoli
Zhang, Nan
Yuan, Yanping
Phelan, Patrick E.
Attia, Shady  ;  Université de Liège - ULiège > Département ArGEnCo > Techniques de construction des bâtiments
Language :
English
Title :
Thermal performance analysis of an existing building heating based on a novel active phase change heater
Publication date :
15 January 2023
Journal title :
Energy and Buildings
ISSN :
0378-7788
eISSN :
1872-6178
Publisher :
Elsevier BV
Volume :
278
Pages :
112646
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
11. Sustainable cities and communities
Available on ORBi :
since 15 November 2022

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