The calculation of the mean radiant temperature of a subject exposed to the solar radiation—a generalised algorithm

Gennusa, Maria La; Nucara, Antonino; Rizzo, Gianfranco; Scaccianoce, Gianluca

doi:10.1016/j.buildenv.2004.06.019

Cited by 107 publications

(61 citation statements)

References 4 publications

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“…Traditional approaches to estimating R in outdoor thermal comfort research can be time-consuming, expensive, cumbersome, and may not adequately address the contribution of the short-and long-wave radiation fluxes on the human body (Hodder and Parsons 2007;La Gennusa et al 2005). Although R can be modeled based on planar measurements of incoming and outgoing short-and long-wave radiation fluxes, readily available radiation data can often be difficult to obtain, as the incoming and outgoing solar and terrestrial radiation fluxes are not all commonly observed variables at many meteorological stations, and the equipment used to make these measurements is costly and highly specialized (Baigorria et al 2004;Gul et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Estimating the radiation absorbed by a human

et al. 2008

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The complexities of the interactions between long-and short-wave radiation fluxes and the human body make it inherently difficult to estimate precisely the total radiation absorbed (R) by a human in an outdoor environment. The purpose of this project was to assess and compare three methods to estimate the radiation absorbed by a human in an outdoor environment, and to compare the impact of applying various skin and clothing albedos (α h ) on R. Field tests were conducted under both clear and overcast skies to evaluate the performance of applying a cylindrical radiation thermometer (CRT), net radiometer, and a theoretical estimation model to predict R. Three albedos were evaluated: light (α h = 0.57), medium (α h = 0.37), and dark (α h = 0.21). During the sampling periods, the range of error between the methods used to estimate the radiation absorbed by a cylindrical body under clear and overcast skies ranged from 3 to 8%. Clothing and skin albedo had a substantial impact on R, with the mean change in R between the darkest and lightest albedos ranging from 115 to 157 W m −2 over the sampling period. Radiation is one of the most important variables to consider in outdoor thermal comfort research, as R is often the largest contributor to the human energy balance equation. The methods outlined and assessed in this study can be conveniently applied to provide

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Section: Introductionmentioning

confidence: 99%

Estimating the radiation absorbed by a human

et al. 2008

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“…Moreover, diffuse and direct component of solar radiation may affect the main radiant temperature and the plane temperature asymmetry with different intensity [15][16][17][18], due to their different behavior inside indoor environment.…”

Section: Effect Of the Solar Radiationmentioning

confidence: 99%

The effect of the climatic condition on the radiant asymmetry

Marino¹,

Misiani²,

Nucara³

et al. 2017

IJHT

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This paper analyzes the influence of solar radiation, considering both its direct and diffuse component, on the local thermal comfort of subjects in indoor environments. In fact, as well as too hot or too cold climatic conditions may cause global thermal discomfort, an unwanted cooling or heating of a particular confined area of the body may cause local thermal discomfort, which may occur for vertical air temperature differences, unsuitable temperatures of the floor, drafts and radiant asymmetries. In this context, this work is focused on radiant asymmetry issues and it aims to analyze the radiant asymmetry dependence on outdoor climate parameters, with special regard to the solar radiation. To this purpose, a specific experimental campaign of measurements was conducted. The analysis of the results shows that the solar radiation alters the radiant field and produces a high radiant asymmetry in correspondence of the points of the environment directly irradiated by sunrays.

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“…The expression for the mean radiant temperature due to surface temperature and solar radiation in Eq. (8) (in the part of solar radiation effect) has been adopted from the relation given by La Gennusa et al [7].…”

Section: Thermal Comfort Indexmentioning

confidence: 99%

“…Cannistraro et al [6] developed the view factors between human body and rectangular surfaces in parallelepiped environments in the form of polynomial equation. La Gennusa et al [7] have developed the mathematical model to determine the mean radiant temperature of a subject exposed to solar radiation. Sullivan [8] and Lyons et al [9] have developed the relation to calculate the PMV that accounted for the solar radiation effect.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Human Thermal Comfort from a Glass Window

Khamporn¹,

Chaiyapinunt²

2014

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Abstract. The effect of the glass window on the thermal comfort of a person sitting near the glass window is investigated by performing the experiment in a test room. A clear glass window and a tinted glass window are chosen to be the test windows in this study. The index chosen to describe the thermal comfort is the predicted percentage of dissatisfied (PPD). The important parameter for evaluating the human thermal comfort condition is the mean radiant temperature. The mathematical model for predicting the mean radiant temperature is presented. The predicted mean radiant temperature and the mean radiant temperature evaluated from the operative temperature are compared. The agreement is good. It is found that the mean radiant temperature, the predicted mean vote (PMV) and the PPD are all dependent on the transmitted solar radiation and the surface temperature of the glass window. Higher value of the mean radiant temperature yields higher value of the PMV and the PPD. The room with a clear glass window installed has a high thermal discomfort condition which is mainly come from the solar radiation. The amount of the thermal discomfort is directly varied with the amount of the transmitted solar radiation. For a high transmittance glass window, the thermal discomfort due to solar radiation is greater than the thermal discomfort due to surface temperature. For a low transmittance (high absorptance) glass window, the thermal discomfort due to surface temperature becomes important when compared to the thermal discomfort in the part of solar radiation.

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The calculation of the mean radiant temperature of a subject exposed to the solar radiation—a generalised algorithm

Cited by 107 publications

References 4 publications

Estimating the radiation absorbed by a human

Estimating the radiation absorbed by a human

The effect of the climatic condition on the radiant asymmetry

An Investigation on the Human Thermal Comfort from a Glass Window

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