Study on a ventilating vest with thermoelectric cooling to improve thermal comfort and cognitive ability

IF 6.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Energy and Buildings Pub Date : 2024-12-15 DOI:10.1016/j.enbuild.2024.115188
Haiying Wang, Guangyan Zhang, Huxiang Lin, Junli Sun, Rengjie Yan, Hang Meng, Songtao Hu, Hui Zhu
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Abstract

Hot waves happened more often in summer due to the global climate change, which leads to hot indoor environment when air conditioning systems are absent. To improve individual thermal comfort in warm/hot indoor environment, a ventilating vest with thermoelectric cooling (TEC) was proposed. The design of TEC module and ventilating vest was introduced. The measured cooling capacity of cooling vest was about 25 W, including both sensible and latent heat. The effect of cooling vest on thermal comfort and cognitive ability was tested in the 29 °C, 31 °C and 33 °C environments. 18 male subjects were recruited to participant in the experiments. Subjective questionnaires including thermal sensation vote, thermal comfort vote, thermal acceptance vote, sweat feeling vote, and cold stimuli sensation vote were collected. Three cognitive tests were conducted including the Stroop test, typing test and number remember test. Physiological parameters including skin temperature, core temperature, local skin heat flux and heart rate variability (HRV) were measured. Results showed that continuous exposure to hot environment made the subjects felt hotter, more uncomfortable, more unbearable and sweatier. With the use of ventilating vest, all these subjective votes were improved significantly. With the ventilating vest, the skin temperatures of chest and back decreased a little, the decline was more significant in 33 °C. The mean skin temperature kept increasing during hot exposure, while the vest stopped the further increasing and reduced it slightly. When cooling vest was used, the core temperature was decreased by 0.05 °C, 0.3 °C, and 0.5 °C in the three temperature conditions, while the local skin heat flux increased approximately 4.8 % to 33.3 %. With the use of ventilating vest, the HRV indices of SDNN (Standard Deviation of Normal to Normal Intervals) and RMSSD (Root Mean Square of Successive Differences) were increased, while the LF/HF (Low Frequency to High Frequency Ratio) was decreased. Subjects’ cognitive performance in the three tests were also improved significantly when the vest was used.
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由于全球气候变化,夏季热浪频发,这导致在没有空调系统的情况下室内环境炎热。为了改善个人在温暖/炎热室内环境中的热舒适度,有人提出了一种带有热电冷却(TEC)的通风背心。介绍了 TEC 模块和通风背心的设计。经测量,降温背心的制冷量约为 25 W,包括显热和潜热。在 29 °C、31 °C 和 33 °C的环境中测试了降温背心对热舒适度和认知能力的影响。实验共招募了 18 名男性受试者。主观问卷包括热感觉投票、热舒适度投票、热接受度投票、出汗感觉投票和冷刺激感觉投票。实验还进行了三项认知测试,包括 Stroop 测试、打字测试和数字记忆测试。测量的生理参数包括皮肤温度、核心温度、局部皮肤热通量和心率变异性(HRV)。结果显示,持续暴露在高温环境中会让受试者感觉更热、更不舒服、更难以忍受和更容易出汗。使用通风背心后,所有这些主观感受都得到了明显改善。穿上通风背心后,受试者胸部和背部的皮肤温度略有下降,33 °C时下降更为明显。在高温暴露期间,平均皮肤温度持续上升,而背心阻止了温度的进一步上升,并略有下降。使用降温背心后,在三种温度条件下,核心温度分别下降了 0.05 °C、0.3 °C 和 0.5 °C,而局部皮肤热通量增加了约 4.8 % 至 33.3 %。使用通风背心后,心率变异指数 SDNN(正常与正常间期的标准偏差)和 RMSSD(连续差值的均方根)增加了,而 LF/HF(低频与高频比)降低了。使用背心后,受试者在三项测试中的认知表现也有明显改善。
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来源期刊
Energy and Buildings
Energy and Buildings 工程技术-工程:土木
CiteScore
12.70
自引率
11.90%
发文量
863
审稿时长
38 days
期刊介绍: An international journal devoted to investigations of energy use and efficiency in buildings Energy and Buildings is an international journal publishing articles with explicit links to energy use in buildings. The aim is to present new research results, and new proven practice aimed at reducing the energy needs of a building and improving indoor environment quality.
期刊最新文献
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