The Computational Fluid Dynamics simulation was used in the development of a new generation cooking appliance Simplicity in GORENJE concern. The intention was to create the best possible baking conditions for different heating systems. As the oven is multifunctional, radiation, conduction, natural and forced convection mechanisms of heat transfer are used. Several discrete models were created. The influence of geometry change and boundary conditions variations to the velocity and temperature fields distribution in the oven cavity was analyzed. The results of numerical simulations were validated with measurements taken from an oven prototype. After successfully passing the standard tests, the oven came into serial production and was launched on the market.
F.06 Development of a new product
COBISS.SI-ID: 12089371The subject of the invention is a process device for coating particles that falls within the field of chemical and pharmaceutical technology. It represents an improvement on the process equipment for coating particles by bottom spraying and works on the principle of solid particles fluidization. The improvement was achieved with the new swirl flow generator design. Besides, the improvement of the conventional Wurster coater was attained by installing slots for additional air inflow in the chamber. Compared to the conventional Wurster coater, both construction improvements enable better coating film uniformity and coating process robustness.
F.08 Development and manufacture of a prototype
COBISS.SI-ID: 12184091The district heating network in Ljubljana includes 245 km of pipelines, of which more than half are placed in channels. Evaluation of heat loss is urgent since this part of the network was built between 1960 and 1980. A telemetric system for measuring the following parameters was set up: temperatures of supply, return, pipe insulation, air in channel, soil and environs, moisture and thermal conductivity of the soil and heat flux throughout the soil. Measured data was used for the validation of numerical simulation. The computational domain of the complete CFD simulation comprised the pipeline, channel and soil. The computation showed a little influence of the soil thermal conductivity on heat loss. On the other hand, the numerical simulation of the heat conduction throughout the old insulation of pipe revealed up to 8-times increase of the heat loss through the wet insulation, as the consequence of water leaking. This conclusion is going to enable considerable saving in Ljubljana district heating system.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 11787547