Presents a mathematical model for the measurement of thermal comfort. Compares the results with previous measurements of air velocity in buildings with and without air conditioning.
Describes qualitative experimental investigation of the air flow in a scale model representing a typical, average hall. Smoke was used to display the air flows. A mathematical model was also developed. Determination of the turbulent air flow in the model confirms the suitability of the mathematical model foruse in quantitative experiments, in particular for measuring the heat flux density.
This paper presents the results of a computational and experimental study to assess the possible benefits of using mathematical modeling techniques for cleanroom design. A two-dimensional modeling visualization has been used for each of the cases studied. This has the advantage that its relative cheapness allows more design variations to be analyzed than would be possible with a three-dimensional method. Full-scale measurements were also taken in the cleanroom which was the subject of the modeling exercise.
Outlines some of the principles behind air driven aspects of moisture in buildings and illustrates how calculation methods and mathematical modelling techniques may be used to both predict and remedy associated problems. Primary remedies include a reduction in the generation of moisture, ensuring thermal integrity of the building and providing adequate ventilation. The use of dehumidification may also have a role to play. Mathematical models offer an inexpensive method for assessing design ideas at an early stage of development.
This paper reviews the work carried out in the Netherlands on moisture problems. In current air flow simulation models for buildings, moisture transfer and diffusion in and between rooms are not taken into account. The aim of the research project is the development of an integral hygrothermal model in which the above mentioned aspects are incorporated.
This paper describes the development of a computational air flow modelling technique, and identifies applications within clean room installations. Details are given of a validation exercise in which air flow patterns and velocities for a number of simple 2-dimensional configurations were both measured and predicted. The good agreement between measurements and predictions clearly demonstrates the usefulness of the method.
Infiltration heat loss has become more important in the energy loss of modern buildings. It depends on a variety of factors. Computer analysis points to the effect of storey number, ground plan features and exhaust ventilation systems. Different rooms exhibit infiltration heat loss maxima at different outdoor temperatures.
A new method for measuring interzonal air movement, using up to four different tracer gases simultaneously, has been developed at the Polytechnic of Central London and tested in a solar air-heated experimental house in Peterborough, UK.
This paper deals with a new computer program, MOVECOMP, which calculates the in- and exfiltration and the airflows between the rooms of a multicell building. The calculations are made due to wind and thermal forces and the characteristics of the leakage openings. MOVECOMP was developed to be user friendly: input data are limited and output data are very flexible. The userchooses which output he wants from a menu. The building is described with asystem of pressure nodes, connected to each other through flow-pressure difference functions.
Login