Passive Building Cooling
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A For the present account of passive building cooling, orientation, shade, ventilation and thermal mass can reduce indoor heat without continuous mechanical cooling. In architectural science, the term thermal mass refers to material that absorbs and releases substantial heat with a slow temperature change. The definition gives researchers a common starting point for discussing passive building cooling, but it does not identify a cause by itself. Two observations of passive building cooling can share the label thermal mass while differing in scale, timing or origin. B Knowledge of passive building cooling accumulated unevenly across buildings in warm climates. A striking report could establish that a pattern existed, yet it could not show whether night ventilation operated elsewhere. Researchers examining passive building cooling therefore moved toward shared definitions and planned comparisons based on occupied-building monitoring rather than discarding the earlier record. C Researchers rely chiefly on occupied-building monitoring to investigate passive building cooling. Research on passive building cooling has found that indoor temperature, air movement, energy and occupant experience are measured through hot periods. They decide their comparison, exclusions and outcome measures for passive building cooling in advance. A result about passive building cooling is treated as stronger when it survives more than one source of evidence, not simply when one instrument measuring passive building cooling reports many decimal places. D The evidence about passive building cooling is informative but conditional. One point relevant to passive building cooling is that passive measures can improve comfort and cut peak demand, but their success depends on climate, design and user control. Researchers test night ventilation as an explanation. Evidence reviewed for passive building cooling shows that cooler night air removes heat stored in the building before the next day. Confidence in night ventilation rises when independent measures of passive building cooling agree and rival explanations fail, rather than when a single comparison happens to be statistically precise. E Practical programmes translate evidence about passive building cooling into action. The discussion of passive building cooling notes that designers combine shade, reflective surfaces, insulation and safe ventilation before sizing mechanical systems. Their stated focus is thermal comfort. Teams working on passive building cooling compare later outcomes with conditions before implementation and record unintended effects. This evaluation of passive building cooling determines whether the original explanation involving night ventilation remains useful outside the research setting. F Interpretation of passive building cooling must stop short of a universal claim. For the present account of passive building cooling, a lower air temperature does not guarantee comfort if humidity, radiant heat or noise prevents windows from being used. Future work on passive building cooling is organised around occupant-centred records. For future research on passive building cooling, occupant-centred records will connect measured heat with control, sleep, noise and local heat risk. This use of occupant-centred records targets a specific uncertainty about passive building cooling rather than merely increasing the volume of data.