A periodic clustering review of outdoor thermal comfort studies in this century for their developing trends
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Outdoor thermal comfort (OTC) was significantly affecting human living qualities. Studies about them were popular in recent decades. They explored people’s perception variations towards different thermal conditions. Most studies were conducted in similar ways. They collected data of subjects by questionnaire and of meteorology by instruments or sensors. Findings were acquired through statistical associating data of the two aspects, which is expressed by neutral temperatures (NT) etc. Since the development of techniques and the improvement of residents’ needs, the studies in different periods varied technically. Some post-2020 studies involved an extra factor differing samples, e.g., age, origin, activity intensity etc., discovering NTs varying for either of the factor. They were rarely considered in studies during 2010s. This showed the periodic developments and changes of OTC studies, which is rarely significantly concluded and discussed previously. This article conducted a periodic clustering review of OTC studies published in this century. Selected papers were clustered into several groups regarding their properties. Some trends about their developments were found. They were directive for future studies of this topic.
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