Study of water-filled double-glazing with submerged heat exchanger for solar absorption

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number115019
Journal / PublicationApplied Thermal Engineering
Online published28 Jan 2020
Publication statusPublished - 5 May 2020


Water-filled window with submerged heat exchanger is a new solar-absorbing multi-glazing system. The device is able to heat up services water and reduce room air-conditioning consumption simultaneously. An experimental prototype was constructed and its thermal performance was examined. Based on this prototype, a dynamic simulation model for investigating energy performance was developed. The computational accuracy was verified by comparison with measured data. The numerical model was then used for performance evaluation with a range of environmental conditions. The numerical evaluation showed that for warm-climate operation the water-heating efficiency could be more than 20% during the daytime. Water heating may even continue at night, if the operating conditions are favorable. Further detailed analysis is then suggested to assess the thermal characteristics and the energy-saving potential under realistic application scenarios.

Research Area(s)

  • Building sustainability, Renewable energy, Solar heat absorption, Submerged heat exchanger, Water-filled window