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INVESTIGATION OF HEAT TRANSFER IN THE SPACE BETWEEN THE GLASS AND THE ABSORBER OF AN UNVENTILATED TROMBE WALL

Daniela Chakarova, Boyan Galabov

First published: 2025-08-15https://doi.org/10.5593/sgem2025/4.1/s16.15View metrics

Abstract

The Heat Transfer Coefficient (HTC, h) is critical for evaluating the thermal performance of Trombe Walls (TW), passive solar heating systems that utilize solar energy for space heating. This study analyzes convective and radiative HTC mechanisms on a TW absorber surface, emphasizing factors such as airflow patterns, surface roughness, temperature gradients, emissivity, and environmental conditions (solar radiation, ambient temperature, wind speed). Experimental and numerical methods were applied to quantify HTC for a south-facing aluminium Trombe Wall installed in Varna, during the heating season. Results demonstrated that optimizing absorber surface properties and design parameters significantly improves TW thermal efficiency. The empirically derived total HTC (h = 3.7 W/m-K) aligned with theoretical models, validating the methodology. This work provides actionable insights for designing energy-efficient TW systems, emphasizing their role in reducing carbon emissions and offering sustainable off-grid heating solutions. The TW-s low- temperature operation further enhances indoor thermal comfort, underscoring its viability for green building integration.

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Publication details

Title
INVESTIGATION OF HEAT TRANSFER IN THE SPACE BETWEEN THE GLASS AND THE ABSORBER OF AN UNVENTILATED TROMBE WALL
Authors
Daniela Chakarova, Boyan Galabov
Proceedings
25th International Multidisciplinary Scientific GeoConference Proceedings SGEM2025, Energy and Clean Technologies, Vol25, Issue 4.1
Publisher
STEF92 Technology
Year
2025
Pages
117-124
SWS Citekey
Chakarova202516117124
ISSN
1314-2704; 13142704
ISBN
9786197603835
Language
en
Publication type
Conference Paper
Proceedings contents
Open official contents
Keywords
Trombe WallHeat transfer coefficientbuilding energy balance
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