A heat and mass transfer model of a walking clothed human has been developed in that study. That model predicts the transient thermal responses of the human and clothing giving temperatures, and latent heat losses. A mathematical model was developed for the simulation of the dynamic thermal behavior of clothing and its interaction with the system of human thermoregulation under walking conditions.
A numerical investigation has been made on the effect of thermal and mass buoyancy forces on the development of laminar mixed convection between vertical parallel plates with uniform wall heat and mass fluxes. Some parameters such as velocity, temperature and concentration are presented and their incidence on heat and mass transfer between the plates is discussed for both positive and negative values of the buoyancy ratio. Results and discussions are presented.
Measurements of temperature and local heat flux were operated on a vertical surface, such as a window, equipped with louvers, such as those of a venetian blind, for different window temperatures, irradiation levels, louver to window spacings and louver angles. Results have been compared with calculations (see Airbase record # 14975). The comparison validates the numerical study.
This article presents the numerical study of the influence of louvers, such as those of a venetian blind, on heat transfer from an adjacent vertical surface, such as the indoor side of a window. The physical model used is described. Results show the influence on radiative and convective heat transfer, which were found as being of the same magnitude, of louver spacing, louver tip to window spacing, louver angle, window surface temperature and irradiation.
A simple conceptual approach to room surface convective heat transfer is presented, defining a global room heat transfer coefficient. It is applied to two room ventilation systems : mixing and cross-ventilation.
This method enables the determination of the influence of heating source characteristics on mean radiant temperature for composite room surfaces, as well as on thermal comfort and discomfort. A maximal possible thermal comfort area can be achieved with the determination of the best interactive influence between the building structure and its heating system.
States that most whole building thermal modelling computer programs use simplified, one-dimensional, parallel path descriptions of the building envelope, which may generate serious errors in building load estimation for several structural and material configurations of building envelope components which have high thermal mass and/or two- and three dimensional thermal bridges.
States that inconsistency exists in thermal comfort conditions for local air movement. It is difficult to study, apparently because of the concurrence of the natural convection produced by metabolic heat dissipation of a body and room air movement. Claims that the term local draft sensation can be divided into the physical stimulation of air movement and the physiological perception of a body to analyse such a sensation.
Highly-glazed spaces are attractive in many ways (solar heating, aesthetics, etc.), however, their thermal behaviour remains difficult to predict. In such spaces, the assumptions or methods generally used in building thermal simulation tools - e.g. homogeneous air temperature in the room, simplified calculations of radiative heat transfer between walls, absence of airflow modelling within the room - do not seem appropriate. We have developed a new model (AIRGLAZE) to improve the prediction of the thermal behaviour of large highly glazed spaces.
The thermal dynamic behaviour of buildings is solved by different methods; one of them is based on simulation by means of thermal node models. Computed results of the internal air temperature or the surface temperature are influenced by the used method, by the model for a solved problem situation, and by input values of model elements. The influence of the particular model element can be found by means of a sensitivity analysis.