Consequently there is a big demand/need of modernization and development of new and better presentation techniques.
|Physical variable||Whole-field measuring methods|
|Air temperature||Infrared camera and a measuring screen|
|3-d velocity field||Particle streak velocimetry based on stereo photogrammetry|
|Contaminant concentrations||Absorption tomography (Compare brain imaging in medicine)|
Both experiments and analytical calculations have been performed in order to improve and optimize this new whole-field measuring technique. The experimental part of the investigation has lead to a conference paper to ROOMVENT 2000, see Cehlin et al (2000a). The findings of the presented paper are that this measurement method is very useful for illustration and visualization of the distribution of temperature in a room with displacement ventilation (see figure 1). The IR camera measures the absolute temperature of the screen with very high accuracy. However, the results show that there is a difference between the temperatures of the screen and the air temperature in regions near the diffuser and the floor. The source of error seems to originate from radiation from the surrounding objects and surfaces.
Also a three-dimensional Computational Fluid Dynamics (CFD) model will be built up to analyse the performance of the method under different conditions. Especially the screen temperature relative to the local air temperature will be carefully analysed. The convective heat transfer coefficient along the screen will also be studied. The convective heat transfer coefficient along the screen will also be studied. An abstract is submitted for the present study to CMEM 2001, 4-6 June 2001, Alicante, Spain.
Under the year of 2001 a Licentiate Thesis is intended to be presented. In this thesis the research regarding computed tomography will also be included.