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Further analysis would be useful to refine the extension of the PMV model, and additional studies in non-air-conditioned buildings in warm climates in different parts of the world would be useful to further clarify expectation and acceptability among occupants. It would also be useful to study the impact of warm office environments on work pace and metabolic rate.
Conclusions
The PMV model has been validated in the field in buildings with HVAC systems, situated in cold, temperate and warm climates and studied during both summer and winter. In non-air-conditioned buildings in warm climates, occupants may perceive the warmth as being less severe than the PMV predicts, due to low expectations.
An extension of the PMV model that includes an expectancy factor is proposed for use in non-air-conditioned buildings in warm climates.
The extended PMV model agrees well with field studies in non-air-conditioned buildings in warm climates of three continents.
Thermal comfort and air quality in a building should be considered simultaneously. A high perceived air quality requires moderate air temperature and humidity.
Acknowledgement
Financial support for this study from the Danish Technical research Council is gratefully acknowledged.
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