Submitted by Maria.Kapsalaki on Wed, 07/02/2014 - 22:24
In this paper, we propose a new calculation method for evaluating the inhomogeneous outdoor thermal environment by incorporating a multi-node human thermoregulation model into the simulation method based on CFD analysis of the outdoor thermal environment. We also investigated the effects of weather conditions on the inhomogeneity of the radiant environment and the thermal comfort for pedestrians using the proposed calculation method. Two different weather condition cases are investigated in this study: (1) a scorching hot day and (2) a cloudy day.
Submitted by Maria.Kapsalaki on Fri, 10/25/2013 - 19:52
The Aluminerie Alouette Inc. (AAI) smelter in northern Quebec, Canada recently completed a major plant expansion that includes a new casthouse for the continuous production of low-profile, air-cooled aluminium sows. The radiation and convection heat release of 15 MW to the workplace from the aluminium metal solidification and cooling is significantly higher than that experienced in the traditional water-cooled casting process where the majority of the heat is removed by the cooling water.
About two hundred volume traps were retrieved from dwellings in various radon prone areas inEurope. They were analysed for the purpose of retrospective radon assessment. Emphasis is put onspecific problems encountered when using field samples as opposed to laboratory exposed samples. Itwas seen that in very dusty circumstances, direct penetration of radon decay products from the outsideto the centre of the volume traps calls for extra caution. Rinsing the samples is proposed as a solutionand was tested in field and laboratory conditions, showing good results.
With radiant heating, it is possible to set room air temperature lower than when heating withair-conditioning because the human body is heated by a radiation. As room air temperature decreases,heat loss from walls and windows decreases, and so does the ventilation load. It is often said that theradiant heating, such as floor heating saves energy. This study calculates heat flow at the windows andthe walls of a living-room using computational fluid dynamics (CFD).
Achievement of thermal comfort can be improved if individual control of the environment is allowed,namely through a local heating system (LHS), consisting of individually controlled radiant heating panels, adapted to a common office desk to a seated person. The coupling with of a new radiative module enhances the simulating capabilities of an existing CFD numerical model. The added improvements are applied to the evaluation of the thermal performance o the LHS. A comparative analysis clearly demonstrates the relevance of a due consideration of radiative exchanges.
The present study is directed toward an accurate analysis on the transport of sensible heat overa realistically shaped human body model by way of a coupled convection-radiation simulation technique. A low-Reynolds-number type k- e turbulence model is employed to obtain the convective heat flux distribution with greater accuracy. Configuration factors over the complex geometry are accurately calculated using a Monte-Carlo method incorporating symmetrization procedures.
In the case of moderate climates, convective and radiative heat exchanges are the main avenues for heat losses on a human body. When using a dummy it is sometimes difficult to have a good estimation of the heat transfer coefficients for convection and/or radiation and especially to determine the part of each mode. It is now quite easy to calculate radiative transfer with accuracy. The approach proposed here, is to find a better estimation of the local radiative heat transfer through modeling and to discuss the value of local radiative coefficients in different situations.
The objective of this work is to evaluate the human thermal response in occupied spaces subjected to direct solar radiation. In this study, done in a full scale compartment equipped with an airconditioning system, a thermal-manikin (to simulate the human body posture), a multi-nodal human
Preliminary experiments with a novel glazing system developed at the Desert Architecture and Urban Planning Unit of Ben-Gurion University of the Negev indicated that it may provide improved visual and thermal performance in buildings with large glazed areas located in sunny regions (hot and cold). In winter, it allows solar space heating but reduces glare, local over-heating and damage to furnishings caused by exposure to direct solar radiation.
In this paper, the development of a radiation module coupled with a previous 3D-CFD code is described. This module takes into account the radiative heat transfer between the active surfaces, including those relative to the occupants.