Supervisor¡¯s Foreword
Adaptive thermal comfort in the built environment is a complex problem involving anthropology, physiology, psychology, architecture, and heat transfer disciplines. It is also a frontier problem in the thermal comfort research .eld and of great practical value in sustainable building environment conditioning technologies.
This thesis studied how people with different thermal experiences adapt to dif-ferent indoor climates and the underlying reasons behind the adaptation. A series of thermal comfort surveys and climate chamber experiments were conducted to understand building occupants thermal adaptation from perspectives of physical parameters, physiological acclimation, psychological adaptation, and model development. The following work and .ndings are noteworthy.
It studied the dynamic characteristics of human thermal adaptation in buildings. It was found that people¡¯s understandings of thermal comfort are mutually dependent on their indoor thermal experiences. Also, building occupants¡¯ thermal adaptation exhibits asymmetric trajectories: It is much quicker for occupants to raise their expectations and accept a neutral indoor climate than to lower their expectations and acclimate to under-conditioned environments.
It also investigated the basic laws of physiological acclimatization, and psy-chological adaptation and their effects. Based on the timescale, physiological adaptation was divided into long-term acclimatization and short-term regulation. It was found that the comfort improvement by environmental control approach comes from psychological factors of perception control and physical factors of environ-mental changes, of which the former is more obvious in the environment deviating from thermal neutrality.
Supervisor¡¯s Foreword
Based on the classical heat transfer model of PMV and the theoretical framework of thermal adaptation, an adaptive heat balance comfort model has been developed, which has guiding signi.cance for the development of future adaptive comfort models.
Beijing, China Prof. Yingxing Zhu July 2019