In order to calculate mean radiant temperature in an outdoor environment, we had to calculate a hypothetical sky temperature from directly measurement or an empirical formula of atmospheric radiation expressed as functions of daily mean air temperature, cloud amount, etc.
The authors present a theoretical derivation of the WBGT formula for outdoor conditions that was originally developed from the results of experiments on human subjects, based on a heat balance equation between the human body and its outdoor environment. The three coefficients of wet bulb temperature Tw, globe temperature Tg, and air temperature Ta were expressed in almost the same way as in the indoor WBGT formula, but they contain a new element characterizing solar radiation.
Then main objective of this work is to create subsidies for an analysis of Predicted Mean Vote (PMV) from ISO 7730 (1994) and from the new version of the norm, from 2005, for thermal comfort evaluation in Brazilian workplaces. The furniture industry in the city of Itatiba, So Paulo State, in Brazil, was chosen for the study. A survey among the workers was carried out through questionnaires, collecting data about thermal sensation, clothing and workers activities. Dry and wet bulb temperatures, as well as globe temperatures were measured, simultaneously to the questionnaires.
In this study, a subjective experiment was conducted in a climatic chamber to clarify the effect of moderately hot environment on productivity, especially on the relationship between performance and fatigue. The climatic chamber was conditioned at operative temperature of 25.0C (insulation value of 0.93 clo), 28.0C (insulation value of 0.93 clo), and 28.0C (insulation value of 0.57 clo). Subjects were exposed in the environment for six hours. The performance at 28.0C condition was lower than at 25.0C condition.
Based on a heat balance equation between humans and the environment, the authors developed a theoretical derivation of the indoor WBGT formula, which was originally established empirically by Yaglou and Minard. We demonstrated that the coefficients of wet bulb temperature Tw and globe temperature Tg (= air temperature Ta), in the indoor WBGT formula contain variables such as the metabolic activity, the clothing insulation and the wind velocity, and that these three coefficients do not remain strictly constant.
The objective of the presented research work was to study the effects of moderate operative temperature drifts on human thermal comfort, perceived air quality, and intensity of SBS symptoms. Experimental subjects (52, 50% female) were seated in a climatic chamber and exposed to operative temperature ramps with different slope, direction and duration during two related experiments (0.6 K/h, 1.2 K/h, +2.4 K/h, +4.8 K/h). The studied temperature ranges were 22-26.8C (light clothing - 0.5 clo) and 17.8-25C (heavier clothing - 0.7 clo).
This article is the result of a study on how to close the “gap” between architects and a building service consultant. Closing is necessary in order to be able to create both a better indoor climate and an interesting architectural environment. Especially
Associations between classroom ventilation and pupils’ performance were investigated in primary schools in the United Kingdom. The concentration of carbon dioxide and other parameters were monitored for three weeks in two selected classrooms in each schoo
The importance of heat load and airflow pattern control for occupants’ thermal comfort is studied in a full-scale test room ventilated with chilled beams. The room was furnished with two desks, computers and table lights. Solar irradiation on window and p
The buildings’ environment plays a very important role in health matters and the quality of life. A series of experimental measurements were carried out in the residential sector of the greater region of Athens. Parameters influencing the indoor air quali
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