scholarly journals Influence of Thermal Comfort on Health

2019 ◽  
Vol 70 (4) ◽  
pp. 1187-1191
Author(s):  
Carmen Otilia Rusanescu ◽  
Marin Rusanescu ◽  
Cosmin Jinescu ◽  
Gigel Paraschi

The purpose of this paper is to estimate the conditions of human comfort in Bucharest. To describe the influence of the climate on human health, several indices have been developed describing the degree of physiological comfort offered by the meteorological conditions, taking into account meteorological parameters registered daily by the weather station at the Polytechnic University of Bucharest, Faculty of Biotechnical Systems Engineering: temperature and relative air humidity, wind speed. The following indices were analyzed: summer SCHARLAU index (ISE), winter SCHARLAU index (ISH), thermohigrometric index (THI), wind cooling power (skin stress index) (P), temperature equivalent to cooling wind power Tpr, to determine the influence of thermal comfort on health.

2021 ◽  
Vol 25 (2) ◽  
pp. 60-65
Author(s):  
S.A. Kurolap ◽  
V.S. Petrosyan ◽  
O.V. Klepikov ◽  
V.V. Kulnev ◽  
D.Yu. Martynov

Based on the analysis of official statistics from the Voronezh Hydrometeorological Service, the patterns of the dynamics of pollutants (formaldehyde and soot) are investigated depending on the combination of various meteorological parameters — air temperature, wind speed, relative air humidity. A positive relationship has been established between the increase in atmospheric pollution with formaldehyde and air temperature. With increasing wind speed and relative humidity, the concentration of formaldehyde and soot in the atmosphere of the city, as a rule, decrease. The maximum permissible level of carcinogenic risk to public health has been established, causing concern. The obtained patterns can be used to predict the level of technogenic pollution of the city’s atmosphere, depending on meteorological conditions.


2019 ◽  
Vol 40 ◽  
pp. 140
Author(s):  
Irajá Jantsch de Souza ◽  
Zanandra Boff de Oliveira ◽  
Ezequiel Saretta ◽  
Larrissa Ribeiro Rodrigues ◽  
Clarissa Moraes da Silva ◽  
...  

The present work had the objective of evaluating the thermal comfort by means of the Temperature and Humidity Index (ITU) inside a model of small scale poultry houses using different hedging strategies. The experiment was carried out at the Federal University of Santa Maria Cachoeira do Sul. The coverings used were: fiber cement (control), fiber cement + white paint + thermal blanket, fiber cement + white paint. The temperature and relative air humidity reading were performed inside each model and in the external area, with DTH 22 sensors controlled by Arduino, divided in four periods of summer 2017/2018. Compared to the external environment, the different coverages promoted a mean reduction of ITU from 84 to 76. Significant statistical differences between the different coverage were observed, in which the average ITU of the period of 77.31 observed in the control was reduced to 74.90 on the covers with white paint. Based on the conditions under which the study was conducted, it is recommended to cover asbestos cement + white paint to improve thermal comfort inside poultry houses.


2012 ◽  
Vol 18 (2) ◽  
Author(s):  
L. Lakatos ◽  
T. Szabó ◽  
M. Soltész ◽  
Z. Szabó ◽  
Z. Sun ◽  
...  

Atmospheric drought causes heavy diffi culties of water supply in most fruit species grown in Hungary, although the modern, intensive plantations are already equipped with irrigation. The use a dripping systems are widely applied, therefore nothing was done to avert the risk of atmospheric drought. In excessively dry seasons the reduction of yields is often due to atmospheric drought. Present study aims to utilise measured data of meteorological parameters (relative air humidity and temperature) to develop an index to characterise drought and measure its effect on fruit yield. Causes influencing yields are multiple. Phytosanitary problems are combined with defi cits of water supply. Water deficit of the soil is avoided by dripping irrigation, but the atmosphere is infl uenced by sprinklers only. Atmospherical drought increases the transpiration of the trees intensely and causes reduction of photosynthetic activity, consequently impairs the yield. Applying the index developed in a plantation of 6 sour cherry varieties grown in Hungary (Meteor, Nefris, Pándy, Újfehértói fürtös, Kántorjánosi, Debreceni bôtermô), we measured the specific yields (yield per volume of tree crown) during the period 1989–2011 using the meteorological database of the growing site. Additionally, other parameters characterising the drought are compared and searched for a method most reliable for judging the specific yielding capacity of sour cherry varieties. The results proved convincingly the utility of the index, especially for the varieties Pándy and Újfehértói fürtös. Comparison with other indices expressing the effects of drought revealed the superiority of our index, which will be applied in the future to express the risk of atmospheric drought.


2018 ◽  
Vol 53 (2) ◽  
pp. 239-253
Author(s):  
Leticia Tejera ◽  
Ángeles Beri ◽  
Ximena Martínez Blanco

: This paper analyses daily and seasonal variations on pollen concentrations and the influence of meteorological conditions on the airborne pollen from June 2011 to May 2014. Data is also compared with results from a previous pollen survey from 2000-2001. Ninety-three taxa were identified, belonging to 49 trees and shrub taxa and 44 herbaceous taxa. The most important pollen sources were Poaceae, Platanus, Cupressaceae/Taxaceae, Eupatorieae type, Celtis, Urticaceae, Myrtaceae, Casuarina, Amaranthaceae, Cyperaceae, Fraxinus, Arecaceae, Ricinus communis, Moraceae, Myrsine, Ambrosia, Quercus, and Pinaceae. Pollen was recorded all year round but the main pollen season was from August to April. Inter-annual differences were observed on pollen indexes, dates and values of daily peak concentrations and monthly accumulated concentrations. Temperature, relative air humidity and wind speed and direction seem to be the most influential meteorological variables on pollen concentrations. The number of days that pollen concentrations are above moderate and high thresholds levels is estimated and woody and non-woody pollen concentrations would be above moderate levels on average 182 days per year.


2017 ◽  
pp. 39-43
Author(s):  
A. N. Tsyrulnikova ◽  
A. E. Voropaeva ◽  
A. N. Aleynikova ◽  
V. N. Dotsenko

Objective: to analyze the influence of different meteorological conditions: relative air humidity, atmospheric pressure, precipitation on the incidence of development of AF paroxysms. Material and methods. The study involved 259 patients with AF paroxysms who were admitted into the Cardiology ward of Gomel City Clinical Hospital of Emergency Medical Care during the period from November 2015 to January 2016. Results. We have determined the incidence of development of AF paroxysms depending on such weather conditions as atmospheric pressure, relative air humidity, cloudiness, and precipitation. Conclusion. Meteorological conditions have a direct effect on the occurrence of AF paroxysms. The determined risk factors in this case are: high relative humidity, fall of temperature and harsh precipitation and changes in atmospheric pressure. Also, the aggravating factor in the development of AF paroxysms was age of patients over 56 and a combination of coronary heart disease and hypertension.


2013 ◽  
Vol 56 (1) ◽  
pp. 509-517 ◽  
Author(s):  
D. Němečková ◽  
I. Knížková ◽  
P. Kunc ◽  
L. Stádník

Abstract. The objective of this study was to compare microclimatic conditions in three different housing systems designed for calf rearing – individual wooden hutches, individual tarpaulin hutches and individual pens under shelter – and to evaluate the thermal comfort of calves reared in these systems. Air temperature, relative air humidity and the rectal temperature of calves (n=324) were measured in the hutches and pens during three consecutive years. The hypothesis that the climatic conditions of different housing system designs used in calf rearing affect the thermal comfort of calves was confirmed, as the design of the individual housing systems affected microclimatic conditions and subsequently the rectal temperature of the housed calves as well. Statistically significant differences (P<0.05) were found between the shelter and individual outdoor calf hutches in relation to the measured parameters. In the summer, the shelter showed a significantly (P<0.05) lower air temperature and significantly higher level of both relative air humidity and calf rectal temperature. These significantly higher rectal temperatures in both summer and in transitional periods (from March to June and from September to December) can be explained by microclimatic conditions and specifically by the combination of air temperature and the highest relative humidity that caused less comfortable microclimatic conditions for calves. The high relative humidity is probably caused by inadequate ventilation under the shelter. Therefore, new technology of calf housing under shelter could be recommended as suitable housing only if adequate ventilation is provided.


2020 ◽  
Vol 328 ◽  
pp. 01001
Author(s):  
Natalia Krawczyk ◽  
Andrej Kapjor ◽  
Łukasz J. Orman

This study presents the issue of thermal comfort based on the Fanger model. The research was conducted in 5 rooms in the autumn-winter period. The research consisted of measurement of thermal environment parameters, air temperature and flow rate, relative air humidity, globe temperature sensor and light intensity. During the research, the students filled in questionnaires concerning thermal sensation. This allowed them to express their assessment of thermal comfort (predicted mean vote PMV and predicted percentage of dissatisfied PPD), as well as their preferences concerning the prevailing room conditions. Differences between the actual average predicted rating index and the Fanger model were shown. It can be noted that Fanger’s model does not reflect the results of the respondents.


2020 ◽  
Vol 21 (2) ◽  
pp. 200-205
Author(s):  
Jonathan Willian Zangeski Novais ◽  
Sílvia Finger Dalmaso ◽  
Roberta Daniela de Souza ◽  
Naara Soares dos Santos Brito

O crescimento mal planejado das grandes cidades acarreta o aparecimento das chamadas ilhas de calor urbano, que consequentemente geram desconforto nos cidadãos. Em um contexto universitário, o desconforto térmico pode prejudicar a concentração e desempenho de alunos, professores e funcionários. Assim simulou-se o microclima da Universidade de Cuiabá, campus Barão, com o objetivo de analisar as partes críticas desconfortáveis do campus e sugerir estratégias que possam melhorar o conforto térmico local. Para a simulação utilizou-se o software ENVI-met, que espacializa as variáveis temperatura do ar e umidade relativa do ar, sendo simulados os horários de 08, 14 e 20 horas no período chuvoso e seco, conforme a sazonalidade climática local. Encontrou-se como zonas críticas a entrada do Campus, Bloco A, a área de convivência nos intervalos dos alunos e o estacionamento, atingindo temperaturas máximas de 34 ºC. Outra questão que causa preocupação é a baixa umidade relativa do ar no período seco, em que as 14 horas chegou a mínima 23%. Conclui-se que a intensificação de áreas verdes no campus, como gramados e arborização, a substituição de pavimentos, substituindo parte da área asfáltica por pavimentos de calor específico menor, e a utilização de telhado verde, podem contribuir para a melhoria do conforto térmico do campus.   Palavras-chave: Conforto Térmico. Temperatura do Ar. Umidade Relativa do Ar. Telhado Verde. Arborização.   Abstract The poorly planned growth of large cities leads to the appearance of the so-called urban heat islands, which consequently generate discomfort for citizens. In a university context, thermal discomfort can impair the concentration and performance of students, teachers and staff. Thus, the microclimate of University of Cuiabá, Barão campus was simulated, with the objective of analyzing the uncomfortable critical parts of the campus and suggesting strategies that can improve the local thermal comfort. For the simulation, the ENVI-met software was used, which spatializes the variables air temperature and relative air humidity, simulating the times of 08, 14 and 20 hours in the rainy and dry period, according to the local climatic seasonality. Critical areas were the entrance to Campus, Block A, the living area in the students’ break time and the parking, reaching maximum temperatures of 34ºC. Another issue that causes concern is the low relative air humidity in the dry period, when the 14 hours reached a minimum 23%. It is concluded that the green areas intensification at the campus, such as lawns and afforestation, the replacement of pavements, replacing part of the asphalt area with pavements with lower specific heat, and the use of a green roof, can contribute to the improvement of the campus thermal comfort.   Keywords: Thermal Comfort. Air Temperature. Green Roof. Afforestation.  


Formulation of the problem. Studies of bioclimate of a territory are aimed at determining the favorable and adverse impacts of various climatic factors and their combinations on the human body. Complex urban morphology has a significant impact on microclimate and, accordingly, on thermal comfort of a person in such an environment. The height of buildings, street orientation, and distance between buildings alter the solar energy inlet, affect thermal regime, transform the wind speed and direction at the street level. Studies of the bioclimatic conditions of urban areas during the warm season are highly relevant as they provide an opportunity to evaluate human thermal sensations in the city, as well as the potential effectiveness of adaptation measures to heat stress (architectural measures and measures based on the use of green areas and water bodies). The purpose of the article. The aim of this research is to simulate the bioclimate of an urban environment to determine the human thermal load in summer months based on modern bioclimatic indices and software. Methods. For the purpose of this study, a part of the territory of the Osokorky residential area of Kyiv was selected. To get values of the main meteorological parameters of the researched area, a three-dimensional, prognostic, microscale model ENVI-met was used. ENVI-met pertains to the CFD-models (computation fluid dynamics model) and is designed for microscales with a horizontal resolution from 0.5 to 10 m and with a time step of 10 seconds as maximum. The PET calculation was performed using the RayMan model. Results. A clear hot summer day (04 August 2017) was chosen for the simulation. The simulation was performed from 6:00 EEST on 4 August till 6:00 EEST the next day (output interval – 1 hour). The simulation results show that the values of the main meteorological parameters (air temperature and humidity, wind characteristics) and physiologically equivalent temperature differ significantly within urban spaces, even across small areas. The amplitudes of PET value were maximum in the daytime and made 12°–15°C. The decrease in the amplitude of the air temperature within the researched area in the evening and night hours led to a notable decrease in the PET amplitude to 2°–3°C. The analysis of the simulated PET values for the researched area confirmed that the residents of the urban areas experience the most intense heat stress while staying in the open asphalted areas during the daytime. The duration of the period with comfortable conditions during the researched day was very short – from 22:00 EEST through midnight. The range of the daily course of PET values at different points of the researched area varied from 19.4° (at point No. 7) to 37.1°C (at point No. 5 located in the well courtyard). Based on the PET values simulated for the researched area and for CAWS Kyiv was found the significant differences between thermal comfort conditions within the complex urban spaces and at the weather station. Therefore, the values of bioclimatic indices simulated based on the weather station data can not be applied with any approximation to solve scientific and applied tasks that require information on the bioclimate at particular points in the urbanized environment. To solve such tasks, it is recommended to apply modern methods – ENVI-met and RayMan models. Scientific novelty and practical significance. For the first time in Ukraine, microclimate and thermal comfort conditions within the complex urban environment has been simulated using ENVI-met and RayMan models. The results of such simulation can be used to choose heat adaptation measures which would help to increase the comfort of the urban areas. The simulation of microclimate and thermal comfort conditions of some parts of the city territory is important stage of design of the buildings, in order to choose the optimal location for buildings and trees and to create the most comfortable conditions for people.


2000 ◽  
Vol 25 (4) ◽  
pp. 329-330
Author(s):  
R.J.B. Hemler ◽  
G.H. Wieneke ◽  
P.H. Dejonckere

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