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Improvement of the statical behaviour of pressure controlled axial piston pumps
Darko Lovrec, Edvard Detiček, 2009, izvirni znanstveni članek

Opis: The control of pressure by means of variable displacement pumps is one of the most important tasks in the field of pump control, which is influenced by the properties of the pumps. Looking for a suitable control concept with good static behaviour, a method is tested which tunes the parameters of a controller. Instancing a variable displacement axial piston pump controlled bya 3/2 proportional valve the improvement will be achieved by fuzzy logic on the one hand and a non-linear approach - adaptation of gain of the classical controller - on the other.
Ključne besede: servo hydraulic, variable displacement pump, pressure control, conventional control structures, fuzzy control structures, nonlinear control structures
Objavljeno: 31.05.2012; Ogledov: 911; Prenosov: 27
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Mathematical models for the simulation of pumps systems
Mitja Kastrevc, Edvard Detiček, 2012, izvirni znanstveni članek

Opis: This paper presents the influence of a mathematical model in the simulation of pumping systems; specifically, a model of an induction motor is presented; the paper also covers a comparison between commonly used mathematical models of AC motors. For verification of the simulated data, a practical pump system was tested.
Ključne besede: induction motors, mathematical modelling, hydraulic pump systems
Objavljeno: 10.07.2015; Ogledov: 537; Prenosov: 36
URL Povezava na celotno besedilo

Optimal proportion of refrigerants in single- stage high-temperature heat pump
Milovan Jotanović, Mirko Miščević, Bojan Kulčar, Darko Goričanec, 2012, izvirni znanstveni članek

Opis: The paper presents types of refrigerants with their characteristics for use insingle-stage high-temperature heat pump. A mathematical model is designed; based on the use of the modeling language GAMS a simulation of optimum mixtureproportions of two refrigerants was made, which allows for the heat pump to operate the most efficient. Software package Math Cad Professional wasused to make calculations of the characteristic properties of the heat pump.
Ključne besede: heat transfer, single-stage high temperature pump, refrigerant, simulation of effect
Objavljeno: 10.07.2015; Ogledov: 452; Prenosov: 24
URL Povezava na celotno besedilo

Torsional vibrations at guide-vane shaft of pump-turbine model
Andrej Predin, 1997, izvirni znanstveni članek

Opis: This article focuses on the problem of guide-vane vibrations of reversible pump-turbines, especially, in the pump mode. These vibrations are transmitted to the guide-vane shaft torque. The guide-vane vibrations are caused by the impeller exit flow, which has a turbulent and partly nondeterministic property. Experimentally determined flow velocities at the impeller exit are given. The mathematical models for theoretical torsional vibration prediction formulated using linear and nonlinear differential equations are presented. The results of theoretical calculations are compared with measurements results. The possibility of transferring the parameters from the model to the prototype is discussed.
Ključne besede: pump-turbines, oscillations, guide-vane shaft, torsional vibrations
Objavljeno: 15.06.2017; Ogledov: 374; Prenosov: 195
.pdf Celotno besedilo (3,80 MB)
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Experimental investigation review of biodiesel usage in bus diesel engine
Breda Kegl, Marko Kegl, 2017, izvirni znanstveni članek

Opis: This paper assembles and analyses extensive experimental research work conducted for several years in relation to biodiesel usage in a MAN bus Diesel engine with M injection system. At first the most important properties of the actually used neat rapeseed biodiesel fuel and its blends with mineral diesel are discussed and compared to that of mineral diesel. Then the injection, fuel spray, and engine characteristics for various considered fuel blends are compared at various ambient conditions, with special emphasis on the influence of low temperature on fueling. Furthermore, for each tested fuel the optimal injection pump timing is determined. The obtained optimal injection pump timings for individual fuels are then used to determine and discuss the most important injection and combustion characteristics, engine performance, as well as the emission, economy, and tribology characteristics of the engine at all modes of emission test cycles test. The results show that for each tested fuel it is possible to find the optimized injection pump timing, which enables acceptable engine characteristics at all modes of the emission test cycles test.
Ključne besede: bus diesel engine, fuel injection, fuel spray, combustion, emission, engine performance, tribology characteristics, optimized injection pump timing
Objavljeno: 07.07.2017; Ogledov: 367; Prenosov: 202
.pdf Celotno besedilo (3,81 MB)
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Geothermal heat potential - the source for heating greenhouses in Southestern Europe
Danijela Urbancl, Peter Trop, Darko Goričanec, 2016, izvirni znanstveni članek

Opis: The paper presents economically evaluated solutions for heating greenhouses with geothermal potential, if the same greenhouse is placed in two different locations in Southeastern Europe, one in Slovenia and the other in Serbia. The direct geothermal water exploitation using heat exchangers is presented and the remaining heat potential of already used geothermal water is exploited using high temperature heat pumps. Energy demands for heating greenhouses are calculated considering climatic parameters of both locations. Furthermore, different constructions materials are taken into account, and energy demands are evaluated if the same greenhouse is made of 4 mm toughened single glass, double insulated glass or polycarbonate plates. The results show that the geothermal energy usage is economically feasible in both locations, because payback periods are in range from two to almost eight years for different scenarios.
Ključne besede: geothermal heat exploitation, greenhouses energy demands, high temperature heat pump, economic analysis
Objavljeno: 07.07.2017; Ogledov: 386; Prenosov: 190
.pdf Celotno besedilo (1,02 MB)
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