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Objectives
The objective of this study was to investigate the relationship between side asymmetry in nasal resistance (NR) and severity of the nasal airway obstruction (NAO) in patients with different types of nasal septal deformity (NSD).
Design
Computational fluid dynamics (CFD) study.
Setting
The study was conducted in a tertiary medical centre.
Participants
The study included 232 patients,...
The results of experimental investigation of pulverized coal combustion process with the aim to improve energy efficiency of an industrial steam boiler are presented in the paper. The investigation included measurement of combustion process parameters in four typical operating conditions, from minimum to maximum steam boiler load, and visualization of combustion process by using the camera with thermal...
Main primary energy sources in Serbia are coal, oil and natural gas, oil shale and renewable energy sources. The share of high quality primary energy sources (oil and natural gas) is less than 1% of total geological reserves, while the rest of 99% consists of different types of coal, with highest share of lignite — over 95%. Estimated technically available renewable energy sources potential in Serbia...
The paper analyzes the effect of small deviation of incident angle relative to the focal plane on thermal performance of parabolic-trough solar collector. Decrease of solar collector thermal output is presented in form of coefficient of performance i.e. function of the incident angle deviation. In solar collector operation mode, working fluid (e.g. water) can become overheated. In that case, decreasing...
This paper discusses the energy saving measures for a residential building in Belgrade, Serbia, by investigating the influences of architectural measures and HVAC systems' measures on its energy performance. The residential building selected for this case study is a high energy consumption house with challenging ventilation requirements, located on a narrow and inclined site with particularly obstructed...
Energy audit is a primary step towards a more rational use of primary energy sources in the energy-intensive process such as the production of packaging paper. By the adoption of the Law on efficient use of energy in 2013, energy audits have become mandatory for all industrial companies in Serbia. This paper presents the methodology and results of the one-day energy audit which was conducted in the...
The research presented in this paper focuses on parameters that determine stable operating limits of porous burner. The experimental research was carried out on laboratory installation consisting of ceramic cylinder filled with packed bed of Al2O3 spheres. Gaseous fuel is prepared by mixing the compressed natural gas (CNG) and nitrogen (N2) in defined ratio, depending on set heating value of the inlet...
The results of field measurements conducted in Umka Cardboard Mill hall are presented in the paper. The points of interest were air temperature and humidity distribution inside the hall as well as the temperatures of the cardboard machine surfaces and inner walls of the hall. Temperature, humidity and velocity of air at supply-air openings were also measured. Based on the results material and heat...
The paper presents caracteristics of energy consumption in industrial sector of Serbia, the methodology and results of energy audits (EA) performed in industrial sites and potentials for energy efficiency (EE) improvements. The present state of industrial energy in Serbia could be characterized by significant technological out-of-date, low EE and low level of environmental protection. Presented analysis...
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