Abstract
Sensible heat storage in building materials has been practiced for thousands of years. Recent work at the Centre for Building Studies in the impregnation of concrete with various phase change materials (PCM's) has resulted in the addition of latent heat values which can increase its total thermal storage capacity in the range of 100%–130% within the thermal comfort zone. The alkaline nature of concrete makes it unsuitable for use with many PCM's so the choice of an appropriate impregnant is important. Three PCM's were selected and tested: butyl stearate, dodecanol and polyethylene glycol 600. All three were found to be compatible with autoclaved concrete block which as a low alkalinity. In addition, dodecanol was also found to be suitable for use in regular concrete block.
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