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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1046-A

Book of abstracts draft
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The impact of wall and roof material on the summer thermal performance of building in a temperate climate

Tadeusz KUCZYŃSKI, University of Zielona Gora, Poland
Anna STASZCZUK, University of Zielona Gora, Poland

Building materials with a high thermal mass or phase change materials (PCMs) can be used to prevent overheating of buildings in summer. The paper presents the results of experimental studies carried out in 3 terraced rooms with windows facing south, designed to be identical, except for the walls and roof, which were light timber systems with and without PCM and massive concrete enclosures. The main aim of the study was to compare the influence of PCM and reinforced concrete on the summer thermal performance of a room in an existing building without additional night ventilation in temperate climate. In addition, it aimed to test whether this effect depends on duration and severity of the heat waves. Research has shown that the use of concrete to increase thermal mass has greatly improved summer thermal performance of the rooms. Room peak temperature was reduced by 2.5°C in the first days of heat wave and the differences in maximum room temperatures between studied rooms remained at a level of 1.5°C to 2.0°C during all 17 days of heat wave in July-August 2015. Lining of internal surfaces of walls and roof in the investigated rooms with PCM with melting temperature of 21.7°C did not lead to a significant decrease of indoor temperature in any of the summer months - June, July and August 2015, although the PCM's melting point was selected on the basis of the relationships between its melting point and the average outdoor temperature for the summer months suggested in the scientific literature. The effective use of PCM is only possible if its transition temperature range ensures full PCM solidification which is difficult to achieve because the temperature in buildings is influenced by the type of building, room location, the history of outdoor temperature and solar radiation.

Keywords: Thermal inertia, Phase change material (PCM), Heat waves, Building overheating, Thermal mass