Thermal sensation under high-intensive exercise in naturally ventilated gymnasiums in hot-humid areas of China: Taking basketball players for example

2020 ◽  
pp. 1420326X2097827
Author(s):  
Xiaodan Huang ◽  
Qingyuan Zhang ◽  
Zhangyuan Wang ◽  
Xiaoli Ma
Keyword(s):  
Evaluation System ◽  
Thermal Sensation ◽  
Systematic Evaluation ◽  
Air Velocity ◽  
Humid Climate ◽  
Basketball Players ◽  
Basketball Game ◽  
Sport Activities ◽  
Hot Humid Climate ◽  
Radiant Temperature

As a public building for exercises and entertainments, gymnasiums play an important role in people's daily life. In regions with hot-humid climate, thermal sensation in gymnasiums is directly related to the human health as well as energy consumption. However, little can be found in the systematic evaluation system reported for thermal sensation of athletes in gymnasium in hot-humid climate regions; therefore, there is a need to develop a thermal sensation model for evaluating thermal sensation of athletes partaking sports in these environments. In this study, a field survey on thermal sensation of players in a basketball game was carried out in a naturally ventilated gymnasium in Guangzhou, China. The results showed that the human physiology and thermal sensation of subjects were highly different during active sport state. Moreover, the thermal sensation vote was increased with a rise in the air temperature, the mean radiant temperature and humidity ratio, while thermal sensation vote was reduced with an increase in the air velocity. The metabolic rate, systolic blood pressure and skin temperature were shown to have a positive correlation with the thermal sensation vote. According to the analysis, a predictive thermal sensation model, which has been developed by this study to estimate the thermal sensation under high-intensive sport activities in gymnasiums in regions with a high temperature and high humidity, was evaluated and validated.

A Data-Driven Thermal Sensation Model Based Predictive Controller for Indoor Thermal Comfort and Energy Optimization

2014 ◽  
Author(s):  
Xiao Chen ◽  
Qian Wang
Keyword(s):  
Thermal Comfort ◽  
Thermal Sensation ◽  
Energy Optimization ◽  
Data Driven ◽  
Air Velocity ◽  
Comfort Index ◽  
Indoor Thermal Comfort ◽  
Occupant Feedback ◽  
Predictive Controller ◽  
Radiant Temperature

This paper proposes a model predictive controller (MPC) using a data-driven thermal sensation model for indoor thermal comfort and energy optimization. The uniqueness of this empirical thermal sensation model lies in that it uses feedback from occupants (occupant actual votes) to improve the accuracy of model prediction. We evaluated the performance of our controller by comparing it with other MPC controllers developed using the Predicted Mean Vote (PMV) model as thermal comfort index. The simulation results demonstrate that in general our controller achieves a comparable level of energy consumption and comfort while eases the computation demand posed by using the PMV model in the MPC formulation. It is also worth pointing out that since we assume that our controller receives occupant feedback (votes) on thermal comfort, we do not need to monitor the parameters such as relative humidity, air velocity, mean radiant temperature and occupant clothing level changes which are necessary in the computation of PMV index. Furthermore simulations show that in cases where occupants’ actual sensation votes might deviate from the PMV predictions (i.e., a bias associated with PMV), our controller has the potential to outperform the PMV based MPC controller by providing a better indoor thermal comfort.

scholarly journals Building Configuration of Low-Cost Apartments in Bandung—Its Contribution to the Microclimate and Outdoor Thermal Comfort

Buildings ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 123 ◽  
Author(s):  
Beta Paramita ◽  
Hiroatsu Fukuda ◽  
Rendy Perdana Khidmat ◽  
Andreas Matzarakis
Keyword(s):  
Thermal Comfort ◽  
Open Space ◽  
Low Cost ◽  
Human Perception ◽  
Ground Cover ◽  
Outdoor Thermal Comfort ◽  
Humid Climate ◽  
Hot Humid Climate ◽  
Radiant Temperature ◽  
Building Form

This paper aims to find the microclimate aspect within the building form and configuration of five low-cost apartments (henceforth rusun) in Bandung, Indonesia. There are parallel, square, and interspersed plots investigated with specific discussion on the microclimate aspects that gain human perception of outdoor thermal comfort. The microclimate prognostic model, i.e., ENVI-met, was used to determine the mean radiant temperature (Tmrt), which was then used to describe the living quality of outdoor thermal comfort, i.e., PET (physiologically equivalent temperature) in a hot-humid climate context. A parallel plot with building orientation toward north-south was found as the most beneficial building form and configuration. Somehow, the parallel plot toward the west-east orientation did not provide similar performance. Nevertheless, the square plot provided uncomfortable perception as there was an absence of building shade within the wide open space and ground cover to absorb the insolation. The interspersed plot can be considered for the building configuration because it generates more wind among other plots. The building form and configuration of rusun with passive design seems to not be able to achieve outdoor thermal comfort. The highest PET value of Model D with the square plot had PET = 41 °C (hot) while the lowest PET in Model A with the parallel plot (N-S) had PET = 34.2 °C (slightly warm).

scholarly journals Experimental Study on the Efficacy of a Novel Personal Cooling Vest Incorporated with Phase Change Materials and Fans

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1801 ◽  
Author(s):  
Xiaoyang Ni ◽  
Tianyu Yao ◽  
Ying Zhang ◽  
Yijie Zhao ◽  
Qin Hu ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Energy Savings ◽  
Thermal Sensation ◽  
Humid Climate ◽  
Physiological Strain ◽  
Human Trials ◽  
High Level ◽  
Hot Humid Climate ◽  
Personal Cooling

In recent years, personal cooling has aroused much attention because it can achieve both localized high-level thermal comfort and build energy savings. In this study, a novel hybrid personal cooling vest (PCV) incorporated with phase change materials (PCMs) and ventilation fans was developed, and its efficacy was investigated by human trials in a hot-humid climate chamber. Three generally accepted indices (thermal load, Q; thermal sensation, TS; and physiological strain index, PSI) and a new proposed index (cumulative heat storage, CHS) during human trials were comparatively studied between the two human trial groups, i.e., the PCV group (wearing the PCV) and the CON group (without PCV). Results found that TS, PSI, and CHS were significantly reduced by the PCV, which suggests that the PCV can significantly improve both the perceptual and physiological strain. In addition, a strong linear relationship (r2 = 0.8407) was found between the proposed index of CHS with PSI, which indicates the applicability and reliability of CHS for assessing physiological heat strain.

Overall and local thermal sensation & comfort in air-conditioned dormitory with hot-humid climate

2016 ◽  
Vol 101 ◽  
pp. 102-109 ◽  
Author(s):  
Yingdong He ◽  
Nianping Li ◽  
Wenjie Zhang ◽  
Jinqing Peng
Keyword(s):  
Thermal Sensation ◽  
Humid Climate ◽  
Hot Humid Climate

Public Housing in Bandung an Assessment and Approaches through Urban Physics

2014 ◽  
Vol 935 ◽  
pp. 273-276 ◽  
Author(s):  
Beta Paramita ◽  
Hiroatsu Fukuda
Keyword(s):  
Thermal Comfort ◽  
Public Housing ◽  
Urban Form ◽  
High Density ◽  
Outdoor Thermal Comfort ◽  
Humid Climate ◽  
Urban Forms ◽  
Hot Humid Climate ◽  
Radiant Temperature

High density of population and vertical buildings seems to be the only aspect fit to the concept for city in the developing country. The vertical housings then become a matter of necessity in high density area, in which the building groups themselves significantly contribute to microclimate at urban scales. This study is going to give descriptions of outdoor thermal comfort of public housing in Bandung by means its correlation between urban forms and mean radiant temperature. A number of simulations have used ENVI-met to reveal a better urban form which addresses the role of urban physics in the study of outdoor thermal comfort in a hot humid climate area.

scholarly journals Evaluation of a Coupled Model to Predict the Impact of Adaptive Behaviour in the Thermal Sensation of Occupants of Naturally Ventilated Buildings in Warm-Humid Regions

2020 ◽  
Vol 13 (1) ◽  
pp. 255
Author(s):  
Luciano C. de Faria ◽  
Marcelo A. Romero ◽  
Lúcia F. S. Pirró
Keyword(s):  
Computational Models ◽  
Thermal Sensation ◽  
Coupled Model ◽  
Adaptive Behaviour ◽  
Humid Climate ◽  
Clothing Insulation ◽  
Tropical Regions ◽  
Naturally Ventilated Buildings ◽  
Adaptive Behaviours ◽  
The Impact

Improving indoor environment quality and making urban centres in tropical regions more sustainable has become a challenge for which computational models for the prediction of thermal sensation for naturally ventilated buildings (NVBs) have major role to play. This work performed analysis on thermal sensation for non-residential NVBs located in Brazilian tropical warm-humid climate and tested the effectiveness of suggested adaptive behaviours to mitigate warm thermal sensation. The research method utilized transient computational fluid dynamics models coupled with a dynamic model for human thermophysiology to predict thermal sensation. The calculated results were validated with comparison with benchmark values from questionnaires and from field measurements. The calculated results for dynamic thermal sensation (DTS) seven-point scale showed higher agreement with the thermal sensation vote than with the predicted mean vote. The test for the suggested adaptive behaviours considered reducing clothing insulation values from 0.18 to 0.32 clo (reducing DTS from 0.1 to 0.9), increasing the air speed in 0.9 m/s (reducing DTS from 0.1 to 0.9), and applying both suggestions together (reducing DTS from 0.1 to 1.3) for five scenarios with operative temperatures spanning 34.5–24.0 °C. Results quantified the tested adaptive behaviours’ efficiency showing applicability to improve thermal sensation from slightly-warm to neutral.

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