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Open Access Publications from the University of California

Local thermal discomfort caused by temperature stratification at whole-body thermal neutrality


This paper presents laboratory study of local discomfort at the head and feet influenced by vertical temperature difference. We recruited 98 students and exposed them to four temperature differences (0.4, 2.9, 5.9, 8.3 K) between the head (1.1 m) and ankle (0.1 m) level. Results when subjects are close to whole-body thermal neutrality show that the local percentage dissatisfied (PD) is approximately 6% for 0.4 K/m (representing thermal uniformity) and slightly increased with thermal gradient. The regressed PD for all other gradients is substantially lower than the current ASHRAE Standard 55.

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