Influence of short-term thermal experience on thermal comfort evaluations: A climate chamber experiment

2017 ◽  
Vol 114 ◽  
pp. 246-256 ◽  
Author(s):  
Wenjie Ji ◽  
Bin Cao ◽  
Maohui Luo ◽  
Yingxin Zhu
Keyword(s):  
Thermal Comfort ◽  
Short Term ◽  
Climate Chamber ◽  
Chamber Experiment

scholarly journals Thermal comfort environment for migrants: a long-term follow-up climate chamber experiment

2021 ◽  
Vol 2069 (1) ◽  
pp. 012237
Author(s):  
Yu Dong ◽  
Yuan Shi ◽  
Yanfeng Liu ◽  
Jørn Toftum
Keyword(s):  
Thermal Comfort ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Thermal Sensitivity ◽  
Thermal Adaptation ◽  
Indoor Climate ◽  
Climate Chamber ◽  
Chamber Experiment ◽  
Long Term Follow Up

Abstract Migration between different climate regions may change people’s thermal experience and their thermal adaptation. However, few studies have explored the thermal adaptation process and the suitable indoor thermal environment of migrants. In this study, we conducted a long-term tracking comparative experiment on thermal adaptation of migrants moving from severe cold (SC) regions, hot summer and cold winter (HSCW) regions, and hot summer and warm winter (HSWW) regions to cold region of China. A two-year climate chamber experiment was conducted to follow migrants’ progressive thermal adaptation, such as different weeks, months and seasons after they migrated. The results show that the thermal sensation of migrants was significantly associated with their origin, the time after migration and air temperature. In addition, with the increase time after migration, the thermal sensitivity of HSCW and SC migrants showed a significant upward and downward trend, respectively. Two years after migration, the thermal comfort limits of migrants from SC, HSWW and HSCW were almost identical at 23.5-27.8°C, 23.8-27.8°C, and 23.5-27.6°C. The results provides insight to the progression of thermal adaptation and helpful to guide the design of indoor climate for immigrants with different thermal experiences.

Short-term flux chamber experiment to quantify the deposition of gaseous 15N-NH3 to Calluna vulgaris

2008 ◽  
Vol 148 (6-7) ◽  
pp. 893-901 ◽  
Author(s):  
M.R. Jones ◽  
J.A. Raven ◽  
I.D. Leith ◽  
J.N. Cape ◽  
R.I. Smith ◽  
...  
Keyword(s):  
Calluna Vulgaris ◽  
Flux Chamber ◽  
Short Term ◽  
Chamber Experiment

scholarly journals A climatic chamber experiment to test the short term effect of increasing temperature on branched GDGT distribution in Sphagnum peat

2014 ◽  
Vol 73 ◽  
pp. 109-112 ◽  
Author(s):  
Arnaud Huguet ◽  
André-Jean Francez ◽  
My Dung Jusselme ◽  
Céline Fosse ◽  
Sylvie Derenne
Keyword(s):  
Term Effect ◽  
Climatic Chamber ◽  
Short Term ◽  
Short Term Effect ◽  
Sphagnum Peat ◽  
Chamber Experiment ◽  
Increasing Temperature

scholarly journals High-Performance Workwear for Coal Miners in Northern China: Design and Performance Evaluation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ying Ke ◽  
Qing Zheng ◽  
Faming Wang ◽  
Min Wang ◽  
Yi Wang
Keyword(s):  
Performance Evaluation ◽  
Thermal Comfort ◽  
High Performance ◽  
Northern China ◽  
Coal Miners ◽  
Climate Chamber ◽  
Local Skin ◽  
Worker Performance ◽  
And Performance ◽  
Skin Temperatures

Abstract The design of workwear has significant effects on worker performance. However, the current workwear for coal miners in Northern China is poor in fitness and thermal comfort. In this study, new workwear (NEW) for coal miners was developed with the design features providing better cold protection and movement comfort performance, as compared with a commonly worn workwear (CON). To evaluate the effectiveness of NEW, we conducted human trials which were performed using simulated work movements (i.e., sitting, shoveling, squatting, and crawling) in a climate chamber (10°C, 75% RH). Physiological measurements and perceptual responses were obtained. The results demonstrated that the local skin temperatures at chest, scapula, thigh, and calf; mean skin temperatures,; and thermal comfort in NEW were significantly higher than those in CON. NEW also exerted an improvement in enhancing movement comfort. We conclude that NEW could meet well with the cold protective and mobility requirements.

Broadening human thermal comfort range based on short-term heat acclimation

Energy ◽  
2019 ◽  
Vol 176 ◽  
pp. 418-428 ◽  
Author(s):  
Daokun Chong ◽  
Neng Zhu ◽  
Wei Luo ◽  
Zhiyu Zhang
Keyword(s):  
Thermal Comfort ◽  
Heat Acclimation ◽  
Short Term ◽  
Human Thermal Comfort

scholarly journals Validation of a coupled <i>δ</i><sup>2</sup>H<sub><i>n</i>-alkane</sub>–<i>δ</i><sup>18</sup>O<sub>sugar</sub> paleohygrometer approach based on a climate chamber experiment

2021 ◽  
Vol 18 (19) ◽  
pp. 5363-5380
Author(s):  
Johannes Hepp ◽  
Christoph Mayr ◽  
Kazimierz Rozanski ◽  
Imke Kathrin Schäfer ◽  
Mario Tuthorn ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Vicia Faba ◽  
Isotope Composition ◽  
Leaf Water ◽  
Source Water ◽  
Climate Chamber ◽  
Chamber Experiment ◽  
Leaf Wax ◽  
Hydrogen Isotope Composition ◽  
Water Isotope

Abstract. The hydrogen isotope composition of leaf-wax-derived biomarkers, e.g., long-chain n-alkanes (δ2Hn-alkane), is widely applied in paleoclimate. However, a direct reconstruction of the isotope composition of source water based on δ2Hn-alkane alone is challenging due to the enrichment of heavy isotopes during evaporation. The coupling of δ2Hn-alkane with δ18O of hemicellulose-derived sugars (δ18Osugar) has the potential to disentangle this limitation and additionally to allow relative humidity reconstructions. Here, we present δ2Hn-alkane as well as δ18Osugar results obtained from leaves of Eucalyptus globulus, Vicia faba, and Brassica oleracea, which grew under controlled conditions. We addressed the questions of (i) whether δ2Hn-alkane and δ18Osugar values allow reconstructions of leaf water isotope composition, (ii) how accurately the reconstructed leaf water isotope composition enables relative humidity (RH) reconstruction, and (iii) whether the coupling of δ2Hn-alkane and δ18Osugar enables a robust source water calculation. For all investigated species, the n-alkane n-C29 was most abundant and therefore used for compound-specific δ2H measurements. For Vicia faba, additionally the δ2H values of n-C31 could be evaluated robustly. Regarding hemicellulose-derived monosaccharides, arabinose and xylose were most abundant, and their δ18O values were therefore used to calculate weighted mean leaf δ18Osugar values. Both δ2Hn-alkane and δ18Osugar yielded significant correlations with δ2Hleaf water and δ18Oleaf water, respectively (r2=0.45 and 0.85, respectively; p<0.001, n=24). Mean fractionation factors between biomarkers and leaf water were found to be −156 ‰ (ranging from −133 ‰ to −192 ‰) for εn-alkane/leaf water and +27.3 ‰ (ranging from +23.0 ‰ to 32.3 ‰) for εsugar/leaf water, respectively. Modeled RHair values from a Craig–Gordon model using measured Tair, δ2Hleaf water and δ18Oleaf water as input correlate highly significantly with modeled RHair values (R2=0.84, p<0.001, RMSE = 6 %). When coupling δ2Hn-alkane and δ18Osugar values, the correlation of modeled RHair values with measured RHair values is weaker but still highly significant, with R2=0.54 (p<0.001, RMSE = 10 %). Finally, the reconstructed source water isotope composition (δ2Hs and δ18Os) as calculated from our coupled approach matches the source water in the climate chamber experiment (δ2Htank water and δ18Otank water). This highlights the great potential of the coupled δ2Hn-alkane–δ18Osugar paleohygrometer approach for paleoclimate and relative humidity reconstructions.

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