Questionnaire surveys reveal differences in thermal comfort in underground commercial buildings and subway platforms, suggesting optimal indoor temperatures.
Understanding the thermal comfort of densely populated areas in underground buildings is more significance. This paper takes two typical densely populated areas of underground buildings in Xi'an as examples, conducts questionnaire surveys and field tests on their thermal comfort. The results showed that in winter and summer, the frequency of thermal sensation of underground commercial buildings is higher than that of underground subway platforms, while not much difference in wet sensation and wind speed sensation. The thermal neutral operating temperature for underground commercial buildings in summer and winter is 27.1?C and 20.2?C. The thermal neutral operating temperature for underground subway platforms in summer and winter are 26.7?C and 21.8?C. The expected indoor temperature for underground commercial buildings in summer and winter is 26.6?C and 19.2?C. The expected indoor temperatures for underground subway platforms in summer and winter are 25.2?C and 20.6?C. It provides reference value for the creation of thermal environment in densely populated areas of underground buildings.
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Liu et al. (2025) studied this question.
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