Authors:M. Zheng, L. Zhang, H. P. Teng, J. Hu and M. L. Hu
, Li Y. S. , Tian Y. Y. , et al. ( 2014 ), Effect of blade installation angle on power efficiency of resistance type VAWT by CFD study . International Journal of Energy and Environmental Engineering , 6 ( 1 ), 1 – 7
It is a prime aim to ensure a suitable comfort level in case of office buildings. The productivity of office employees is directly influenced by the comfort. Thermal discomfort and poor indoor air quality deteriorate the intensity and quality of human work. We investigated the comfort in office buildings with on-site measurements during the summer season. The office buildings were operating with different HVAC (Heating, Ventilating and Air-Conditioning) systems: ducted fan-coil with suspended ceiling, installation, non-ducted fan-coil with floor-mounted installation, active chilled beam with fresh air supply.
We evaluated the thermal comfort under PMV (Predicted Mean Vote), PPD (Predicted Percentage of Dissatisfied), the local discomfort based on DR (Draught Rate) and the IAQ (Indoor Air Quality) based on carbon dioxide concentration. The comfort measurements were evaluated. The measurements were evaluated with scientific research methods, comfort categories based on the requirements of CR 1752. The results of this comparison were presented in this article.
The first aim of our research is to calculate the solar irradiance on roofs assuming clear sky and real (climatologically typical) conditions, respectively, and compare them in a densely built inner city study area in Szeged (Hungary). The second aim is to analyse the shading effect of the tree-crowns on the possible solar energy gain of building roofs. The calculation of the climatologically potential solar energy gain based on an empirical atmospheric transmittance (calculated from the measured global radiation values). The results show that in the case of clear sky condition the urban vegetation (tree-crowns) causes significant potential solar energy loss on the roofs, but in the real situations this effect is less significant. These obtained results clearly illustrate how useful tool could be the presented calculation method at the economical and technical planning stage of the installation of solar systems on roofs.
( 2001 ), Dry installation of a radiant floor or wall hydronic heating system, metal radiating plates that attach to the edges of side-by-side boards and provide metal slots for holding hot water
1 Introduction The propagation of elastic waves is widely used in the field of non-destructive testing [ 5 ], in particular for quality control and detection defect in mechanical components of machines and industrial installations. Inspection
Authors:Bence Gergő Barsy, Gyula Győri and Péter Tamás Szemes
measurement output. The installation was in all cases done by an expert person, continuously monitoring the data collected by the device during the measurement. During the measurement the experts found everything was fine, and any fine-tuning was carried out