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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 v DKUM: 10.07.2015; Ogledov: 1089; Prenosov: 42
URL Povezava na celotno besedilo

Analysis of two-stage high- temperature heat pump efficiency
Milovan Jotanović, G. Tadić, Jurij Krope, Darko Goričanec, 2012, izvirni znanstveni članek

Opis: The paper shows the potential benefit of using low temperature heat sources with high temperature pumps. Two-stage heat pumps with flash unit and heat exchanger are described. To determine the characteristic parameters of the twoheat pumps a computer program was designed, with which we could determine the dependence of COP and compressor pressure ratios from evaporating temperature. An economic analysis of the justification of the use of heat pumps was made.
Ključne besede: heat transfer, high temperature heat pumps, computer programme, economic analysis
Objavljeno v DKUM: 10.07.2015; Ogledov: 1506; Prenosov: 63
URL Povezava na celotno besedilo

Protection of copper and its alloys using corrosion inhibitor-literature review
Milorad V. Tomić, Miomir Pavlović, Milovan Jotanović, Regina Fuchs-Godec, 2010, izvirni znanstveni članek

Opis: A review of the literature dealing with the electrochemical corrosion of copper and its alloys with purpose to find the most suitable inhibitor for its protection has been done. According to their chemical composition of corrosion inhibitors are divided into inorganic and organic inhibitors. Inhibition of alloying metals are possible (such as the addition of arsenic alloy components in brass, preventing its unzincanization). The paper reviews the theoretical basis of application of inhibitors to protect metals from corrosion as well as an overview of current research application of inhibitorsto protect copper and copper alloys. Benzotriazole (BTA) is most often used corrosion inhibitor for copper and its alloys in acidic and alkaline solution, because of its high inhibition efficiency. The lowest concentration of inhibitor for protection of copper in various solutions was 0.05%, and for the protection of copper in contact with steel is 0.1%. On the surface of copper and brass BTA forms a protective Cu-BTA film. However, BTA is like many other synthesized organic inhibitors is very toxic and if used invery small concentrations. It turnedout that the AETD, AETDA and PTAT good corrosion inhibitors of copper mixed type with the efficiency of inhibition increases with concentration. Due to the adverse effects on the environment, health and other bodies in recent times the focus of researchis transferred to the inhibiting action of biological molecules or mixtures of natural compounds called "Green inhibitors".
Ključne besede: corrosion inhibitors, protection of metals, inorganic inhibitors, organic inhibitors, alloys elements, green inhibitors
Objavljeno v DKUM: 31.05.2012; Ogledov: 2291; Prenosov: 119
URL Povezava na celotno besedilo

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