Certified Energy Auditor Practice Exam

Thermal comfort is a state of mind that expresses satisfaction with the surrounding environment, particularly in terms of temperature and humidity. The choice that indicates skin moisture due to low relative humidity is particularly relevant because comfortable thermal conditions involve a balance between temperature and humidity levels that allow the body to regulate its temperature effectively.

When relative humidity is low, moisture can evaporate from the skin more readily, which can lead to feelings of discomfort if the environment is hot, as the body relies on sweat evaporation to cool down. Therefore, a low relative humidity condition contributes to discomfort if the temperature is also high, but in the case of thermal comfort, one must consider the balance where skin moisture plays a role in facilitating the body's natural cooling processes.

The other choices all present conditions that either directly contradict the principles of thermal comfort or involve scenarios that generally lead to a discomforting environment. High humidity and low temperatures, inconsistent airflow, and fluctuations in temperature can all negatively impact thermal comfort, leading to sensations of clamminess, drafts, or sudden discomfort due to temperature changes, respectively.