scholarly journals Determination Of Heat Load By Wet Bulb Globe Temperature In Working Environment

2015 ◽  
Vol 66 (1) ◽  
pp. 85-89
Author(s):  
Ružena Králiková ◽  
Marieta Maďoranová
Keyword(s):  
Thermal Load ◽  
Working Environment ◽  
Human Organism ◽  
Surrounding Area ◽  
Work Activities ◽  
Wet Bulb Globe Temperature ◽  
Hot Environment ◽  
Microclimatic Conditions ◽  
Globe Temperature

Abstract Thermal load on people in general depends on the heat production in the human organism as a result of physical activity as well as environmental conditions which are affected by transfer of heat between human and the surrounding area. The resulting effect of metabolic exchanges which occur in work activities is the thermal load of organism. The paper deals with the evaluation of microclimatic conditions of the working environment of workers, who are exposed to the hot environment during their work.

scholarly journals IMPROVEMENT OF WORK TEMPERATURE AT CONTENT PRINTING WORKSTATION IN PUBLISHERS AND PRINTING CV GRAFIKA DUA TUJUH

2020 ◽  
Vol 15 (Number 2) ◽  
pp. 52-62
Author(s):  
Bambang Suhardi ◽  
Dwinda Asyfi Addina ◽  
Rahmaniyah Dwi Astuti
Keyword(s):  
Thermal Conditions ◽  
Working Environment ◽  
Average Output ◽  
Wet Bulb Globe Temperature ◽  
Working Temperature ◽  
Standard Set ◽  
The Republic ◽  
Globe Temperature ◽  
Lost Work Time

CV. Grafika Dua Tujuh is an industry engaged in publishing and printing books and student worksheets located in Klaten. The average output produced daily is 85.400 books and student worksheets, while the company has a production target of 90.000 books and student worksheets. Based on the results of interviews with workers, the level of production that is not maximal is caused by an uncomfortable working environment. Workers in the production room complained about the condition of a hot work environment so that workers feel easily tired and lack of concentration. To overcome the hot workplace, workers often go to the restroom and they work while holding the hand fan. This condition disturbed their concentration and cause work errors. If this condition is carried out continuously, there will be a lot of lost work time which can cause a decrease in productivity. This study aims to analyze the improvement of working temperature conditions in the production room of CV. Grafika Dua Tujuh. This research was conducted by directly measuring thermal conditions in the entire production room of CV. Grafika Dua Tujuh. Determination of the coordinate point of room temperature measurement is based on SNI: 16-7061-2004. Workload assessment is carried out based on SNI 7269: 2009. The results of the measurement of work climate at the content printing workstation are the values of air temperature, humidity, and wind speed i.e 33.32 °C, 39.9%, and 0 m/s. In addition, Wet Bulb Globe Temperature Index (WBGT) value is obtained which is on the verge of a limit, i.e 29.90 °C for the category of the heavy workload with an allocation of working time of 87.5%. The temperature is above the standard set by the Ministry of Health of the Republic of Indonesia No. 1405 / MENKES / 2002 which sets the temperature in an industrial room ranging from 18 °C - 28 °C. Improvement for working temperature is done by engineering control, namely the installation of a turbine ventilator or exhaust fan.

scholarly journals Comparison of WBGTs over Different Surfaces within an Athletic Complex

Medicina ◽  
2020 ◽  
Vol 56 (6) ◽  
pp. 313
Author(s):  
Andrew Grundstein ◽  
Earl Cooper
Keyword(s):  
Monitoring Site ◽  
Subtropical Climate ◽  
Sensible Heat ◽  
Artificial Turf ◽  
Wet Bulb Globe Temperature ◽  
University Of Georgia ◽  
Dewpoint Temperature ◽  
Microclimatic Conditions ◽  
Globe Temperature ◽  
The University

Many athletic governing bodies are adopting on-site measurement of the wet-bulb globe temperature (WBGT) as part of their heat safety policies. It is well known, however, that microclimatic conditions can vary over different surface types and a question is whether more than one WBGT sensor is needed to accurately capture local environmental conditions. Our study collected matched WBGT data over three commonly used athletic surfaces (grass, artificial turf, and hardcourt tennis) across an athletic complex on the campus of the University of Georgia in Athens, GA. Data were collected every 10 min from 9:00 a.m. to 6:00 p.m. over a four-day period during July 2019. Results indicate that there is no difference in WBGT among the three surfaces, even when considered over morning, midday, and afternoon practice periods. We did observe microclimatic differences in dry-bulb temperature and dewpoint temperature among the sites. Greater dry-bulb and lower dewpoint temperatures occurred over the tennis and artificial turf surfaces compared with the grass field because of reduced evapotranspiration and increase convective transfers of sensible heat over these surfaces. The lack of difference in WBGT among the surfaces is attributed to the counterbalancing influences of the different components that comprise the index. We conclude that, in a humid, subtropical climate over well-watered grass, there is no difference in WBGT among the three athletic surfaces and that, under these circumstances, a single monitoring site can provide representative WBGTs for nearby athletic surfaces.

scholarly journals Thermal comfort findings: Scenario at Malaysian automotive industry

2013 ◽  
Vol 17 (2) ◽  
pp. 387-396 ◽  
Author(s):  
Ahmad Ismail ◽  
Kumar Karagaratnan ◽  
Kumaran Kadirgama
Keyword(s):  
Thermal Comfort ◽  
Automotive Industry ◽  
Thermal Environment ◽  
Thermal Sensation ◽  
Human Subjects ◽  
Demographic Data ◽  
Working Environment ◽  
Paint Shop ◽  
Wet Bulb Globe Temperature ◽  
Globe Temperature

This paper discusses the findings of thermal comfort assessment at Malaysian automotive industry. Nine critical workstations were chosen as subjects for the study in order to determine the thermal comfort among workers at Malaysian automotive industry. The human subjects for the study comprises of the operators from tire receiving, dashboard assembly, drum tester, body assembly, seat assembly, door check assembly, stamping workstation, engine sub assembly and paint shop of the factory. The environmental factors such as Wet Bulb Globe Temperature (WBGT), relative humidity, air velocity, illuminance were measured using BABUC A apparatus and Thermal Comfort Measurement equipment. Through questionnaire survey, the demographic data of subjects and their perceptions on thermal comfort at each workstation were assessed based on ISO Standard 7730 and thermal sensation scale using Predicted Mean Vote (PMV). Then, Predicted Percentage of Dissatisfied (PPD) is used to estimate the thermal satisfaction of occupants. The results indicated that most of the workstations of the automotive industry are considered as uncomfortable. Tire receiving station is considered having better working environment compared to other stations with lowest PMV index of 1.09 to 1.41 and PPD of 46%. Meanwhile, the engine sub assembly station and paint shop of assembly are considered the worst thermal environment with the PMV index values ranging between 2.1 to 2.9 and PPD values of 81% to 99%. Therefore, these two workstations are considered not comfortable because the thermal sensation scale is warm and almost hot.

Measurement and Evaluation for Productivity in Extreme Hot Environment

2012 ◽  
Vol 209-211 ◽  
pp. 1496-1499 ◽  
Author(s):  
Yu Ping Sun ◽  
Neng Zhu ◽  
Zhe Tian
Keyword(s):  
Physiological Stress ◽  
Thermal Sensation ◽  
Stress Index ◽  
Productivity Measurement ◽  
Wet Bulb Globe Temperature ◽  
Hot Environment ◽  
Wide Range ◽  
Globe Temperature ◽  
Measurement And Evaluation ◽  
Environment Parameters

The productivity in extreme hot environment is not only influenced by the complexity of the task and the technical proficiency of the workers, but also closely related to the heat stress caused by the hot environment. In this study, three methods of productivity measurement were introduced, mainly referred to their applications and limitations. The method of using thermal sensation vote was based on the subjective feelings, and its application was convenient. The method of using wet-bulb globe temperature was based on the environment parameters and working time. It can be applied to a wide range of high temperature. While the method of using predicted mean vote had more comprehensive considerations of environment parameters and thermal sensation, but the complexity measurement of the environment parameters limited the usefulness of this method. Different from the three methods, this study proposed the physiological stress index to be the argument in the calculation of productivity. The physiological stress index combines both the environmental intensity and labor intensity. It reflects physiological conditions of the workers directly and has the potential to predict the productivity online.

The cooling effect of a spray fan in an indoor hot environment

2020 ◽  
pp. 1420326X2091436
Author(s):  
Xiaojing Meng ◽  
Yihang Lv ◽  
Honggang Yang ◽  
Yi Wang
Keyword(s):  
Relative Humidity ◽  
Thermal Environment ◽  
Cooling Effect ◽  
Air Velocity ◽  
Velocity Increase ◽  
Wet Bulb Globe Temperature ◽  
Hot Environment ◽  
Globe Temperature ◽  
Set Up ◽  
Black Globe Temperature

The aim of this study is to evaluate the cooling effect of a spray fan in an indoor hot environment. An experimental workplace with a thermal environment of high temperature and radiation intensity was set up. The hot environment of the experimental workplace could not meet occupational health requirements when the heat source temperature exceeded 150°C. The effects of air velocity and relative humidity on the natural wet bulb temperature, black globe temperature and wet bulb globe temperature (WBGT) were investigated. The maximum reduction of the WBGT was about 1.7°C, with an air velocity increase by 1 m/s. There was a notable cooling effect on the hot environment for low air velocities (e.g. 0–2 m/s), while the cooling effect only increased slightly for high air velocity (e.g. 2–5 m/s). We also found that the indoor WBGT declined by 0.2–0.8°C when the relative humidity was increased by about 10%. These results may provide guidance for reducing heat stress in industrial hot environment.

Comparison of Esophageal, Rectal, and Gastrointestinal Temperatures During Passive Rest After Exercise in The Heat: The Influence of Hydration

2017 ◽  
Vol 26 (2) ◽  
Author(s):  
Yuri Hosokawa ◽  
William M. Adams ◽  
Douglas J. Casa
Keyword(s):  
Repeated Measures ◽  
Wet Bulb Globe Temperature ◽  
Induced Hyperthermia ◽  
Hot Environment ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
Tukey Honestly Significant Difference ◽  
Globe Temperature ◽  
Exercise Induced ◽  
Post Hoc

Context: It is unknown how valid esophageal, rectal, and gastrointestinal temperatures (TES, TRE, and TGI) compare after exercise-induced hyperthermia under different hydration states. Objective: To examine the differences between TES, TRE, and TGI during passive rest following exercise-induced hyperthermia under 2 different hydration states: euhydrated (EU) and hypohydrated (HY). Design: Randomized crossover design. Setting: Controlled laboratory setting. Participants: 9 recreationally active male participants (mean ± SD age 24 ± 4 y, height 177.3 ± 9.9 cm, body mass 76.7 ± 11.6 kg, body fat 14.7% ± 5.8%). Intervention: Participants completed 2 trials (EU and HY) consisting of a bout of treadmill exercise (a 10-min walk at 4.8-7.2 km/h at a 5% grade followed by a 20-min jog at 8.0-12.1 km/h at a 1% grade) in a hot environment (ambient temperature 39.3 ± 1.0°C, relative humidity 37.6% ± 6.0%, wet bulb globe temperature 31.3 ± 1.5°C) followed by passive rest. Main Outcome Measures: Root-mean-squared difference (RMSD) was used to compare the variance of temperature readings at corresponding time points for TRE vs TGI, TRE vs TES, and TGI vs TES in EU and HY. RMSD values were compared using 3-way repeated-measures ANOVA. Post hoc analysis of significant main effects was done using Tukey honestly significant difference with significance set at P < .05. Results: RMSD values (°C) for all device comparisons were significantly different in EU (TRE-TGI, 0.11 ± 0.12; TRE-TES, 1.58 ± 1.01; TGI-TES, 2.04 ± 1.19) than HY (TRE-TGI, 0.22 ± 0.28; TRE-TES, 1.27 ± 0.61; TGI-TES, 1.16 ± 0.76) (P < .01). Across the 45-min bout of passive rest, there were no differences in TRE, TGI, and TES between EU and HY trials (P = .468). Conclusions: During passive rest after exercise in the heat, TRE and TGI were in good agreement when tracking body temperature, with a better agreement appearing in those maintaining a state of euhydration versus those who became hypohydrated during exercise; however, this small difference does not appear to be of clinical significance. The large differences were observed when comparing TGI and TRE with TES.

Evolution of Microclimatic Conditions in Paskov Mine / Ewolucja Warunków Mikroklimatycznych W Kopalni Paskov

2012 ◽  
Vol 57 (4) ◽  
pp. 1045-1055
Author(s):  
Pavel Zapletal ◽  
Pavel Prokop ◽  
Vítězslav Košňovský
Keyword(s):  
Coal Mining ◽  
Mining Activity ◽  
Mining Engineering ◽  
Special Program ◽  
Main Subject ◽  
Coal Basin ◽  
Research Activities ◽  
Microclimatic Conditions ◽  
Technical University

Abstract The main subject of this paper focuses on scientific and research activities conducted in the Institute of Mining Engineering and Safety of the VŠB-Technical University of Ostrava. Cooperation between the VŠB-Technical University of Ostrava and OKD A.S., the only representative of coal mining in the Ostrava-Karviná coal basin, has recently begun to develop again. This paper describes an example discussed in a certain study, which has been undertaken for the Paskov mine, OKD a.s., dealing specifically with the evolution of microclimate parameters in mines that depend on the progress of mining activity at deeper levels over a period of several years. To this end, a special program, aimed at determination of the necessary refrigerating capacity, was established at the VŠB-Technical University of Ostrava.

EFFECTS OF INONIZING RADIATION CAUSED HEAT STRESS ON THE HUMAN BODY FOR STANDARD ISO 7243

2013 ◽  
pp. 47-57
Author(s):  
Van Trong Le ◽  
Thi Tuyet Mai Nguyen ◽  
Thi Xuan Duyen Nguyen ◽  
Ba Luan Nguyen ◽  
Tuyen Pham ◽  
...  
Keyword(s):  
Heat Stress ◽  
Risk Assessments ◽  
Management Systems ◽  
Temperature Index ◽  
Wet Bulb Globe Temperature ◽  
Simple Index ◽  
Simple Tool ◽  
Results Management ◽  
Globe Temperature ◽  
Hot Environments

Objectives: Presents heat stress Standard ISO 7243, which is based upon the wet bulb globe temperature index (WBGT), and considers its suitability for use worldwide. Materials and Methods: The WBGT index are considered and how it is used in ISO 7243 and across the world as a simple index for monitoring and assessing hot environments. Results: Management systems, involving risk assessments, that take account of context and culture, are required to ensure successful use of the standard and global applicability. For use outdoors, a WBGT equation that includes solar absorptivity is recommended. A ‘clothed WBGT’ is proposed to account for the effects of clothing. Conclusion: ISO 7243 is a simple tool to assess the heat stress and may be applicated worldwide.

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