Abstract
Positive thermal perception can affect users’ climate-controlling behavior, indirectly reducing a building’s operational carbon emissions. Studies show that some visual elements, such as window sizes and light colors, can influence thermal perception. However, until recently there has been little interest in the interaction of thermal perception and outdoor visual scenarios or natural elements like water or trees, and little quantitative evidence has been found associating visual natural elements and thermal comfort. This experiment explores and quantifies the extent to which visual scenarios outdoors affect thermal perception. The experiment used a double-blind clinical trial. All tests were done in a stable laboratory environment to eliminate temperature changes, and scenarios were shown through a virtual reality (VR) headset. Forty-three participants were divided into three groups randomly, separately watched VR-outdoor scenarios with natural elements, VR-indoor scenarios, and a control scenario of the real laboratory, then finished a subjective questionnaire conducted to evaluate their thermal, environmental, and overall perceptions while their physical data (heart rate, blood pressure, pulse) was real-time recorded. Results show that visual scenarios could significantly influence thermal perception (Cohen’s d between groups > 0.8). Significant positive correlations were found between key thermal perception index, thermal comfort, and visual perception indexes including visual comfort, pleasantness, and relaxation (all PCCs ≤ 0.01). Outdoor scenarios, with better visual perception, rank higher average scores (M ± SD = 1.0 ± 0.7) in thermal comfort than indoor groups (average M ± SD = 0.3 ± 1.0) while the physical environment remains unchanged. This connection between thermal and environmental perception can be used in building design. By being visually exposed to pleasing outdoor environments, the positive thermal perception will increase, and thus reduce building energy consumption. Designing positive visual environments with outdoor natural elements is not only a requirement for health but also a feasible path toward a sustainable net-zero future.
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Thanks to the proofing reading from Graham Crookes and Priscilla Faucette.
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This work was supported by the National Natural Science Foundation of China (grant number 52078341).
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Highlights
1. Virtual visual scenarios could significantly influence thermal perception and can improve the level of indoor thermal comfort.
2. Environmental evaluation and thermal evaluation showed a positive correlation.
3. Virtual reality environment can be considered a reliable tool in visual-thermal perception research.
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Wu, C., Cui, J., Xu, X. et al. The influence of virtual environment on thermal perception: physical reaction and subjective thermal perception on outdoor scenarios in virtual reality. Int J Biometeorol 67, 1291–1301 (2023). https://doi.org/10.1007/s00484-023-02495-3
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DOI: https://doi.org/10.1007/s00484-023-02495-3