ABSTRACT

Ambitious and innovative refurbishment measures will be required to meet the European Union’s goals for limiting building energy consumption. Envelope efficiency can be enhanced, for instance, with new materials and improved passive techniques. Trombe walls (TWs), one such technique, reduce heating demand in winter, although they cause overheating in warm climates. That drawback may be corrected with thermal-optically reversible materials. In this study, a thermochromic mortar was applied to a prototype TW to reduce solar absorption in summer without affecting its wintertime efficacy. Further to field measurements, the maximum surface temperature reached on the wall’s thermochromic cladding (TCC) was 32°C in winter and 44.7°C in summer. The indoor cold weather temperature in the module ranged from 7.9°C to 16.5°C for a mean of 11°C, compared to 25.1°C to 32.2°C with a mean of 28.9°C in warm weather. Ventilating the air gap at 60–200 ach prevented the cladding from fading to nearly colourless in winter. In light of the improved thermal transfer performance delivered, the TTW proposed can profitably be used for energy refurbishment in existing buildings.

摘要

为实现欧盟限制建筑能耗的目标，将需要雄心勃勃的创新整修措施。例如，可以使用新材料和改进的被动技术来提高包络效率。Trombe 墙 (TW) 是此类技术之一，可减少冬季的供暖需求，尽管它们会在温暖的气候下导致过热。这个缺点可以用热光可逆材料来纠正。在这项研究中，将热致变色砂浆应用于原型 TW，以减少夏季的太阳能吸收，而不会影响其冬季功效。除了现场测量外，墙体热致变色覆层 (TCC) 的最高表面温度在冬季为 32°C，在夏季为 44.7°C。模块中的室内寒冷天气温度范围为 7.9°C 至 16.5°C，平均为 11°C，而 25°C。1°C 至 32.2°C，温暖天气平均为 28.9°C。以 60-200 ach 的速度对空气间隙进行通风，可防止覆层在冬季褪色至几乎无色。鉴于已提供改进的热传递性能，建议的 TTW 可有利地用于现有建筑物的能源翻新。