Jasmina Radosavljević

Estimation of Indoor Temperature for a Direct-Gain Passive Solar Building

AbstractThis paper examines the effects of passive solar heating produced by a direct passive solar system consisting of windows for direct insolation in a residential building located in Nis, Serbia. A mathematical model is presented to calculate the temperature in the room of a building with a direct passive solar system, depending on the size of the opening, window slope (slanting or vertical position), orientation of the room, and the size of the eave above the window (if it is installed). Using the proposed mathematical model, the inner air temperatures of a thermally insulated residential building with a direct passive solar system are analyzed for different building orientations during the period between January and March of 2008. Two software packages are developed to support the proposed mathematical model.

Estimation of Indoor Temperature for a Passive Solar Building with a Combined Passive Solar System

AbstractPassive solar design strategies for buildings are necessary for annual heating energy demand reduction. This paper presents a mathematical model for interior room temperature calculation of...

Estimating the Effects of Environmental Conditions on Active Solar Wall Air Heating System Efficiency

AbstractThis study analyzed the effect of the environmental conditions on the thermal efficiency of an active solar wall with forced convection. The analyzed system is comprised of a double glass glazing and a massive wall with an opening and central channel in it. In order to increase the efficiency, we provided a fan at the bottom vent of the wall. The active solar wall is more advanced compared to the simple Trombe solar wall with a relatively low thermal resistance, which we took as a reference in our experimental analysis. This paper presents a one-dimensional steady-state mathematical model for simplified analysis of the efficiency of active solar wall air heating systems. We analyzed the obtained results in order to predict the effects of environmental parameter variations, such as solar radiation, ambient temperature, and wind velocity, on thermal efficiency.

Simulation of hybrid electrical vehicle for two different driving modes

Original scientific paper This paper shows an example of computer simulation of hybrid vehicle in two different driving modes. This example shows multiple areas of operation of a simulated hybrid electric vehicle. The hybrid electric vehicle is of combined type, similar to Toyota Prius cars. This hybrid electric vehicle has two types of driving power: the electric motor and the internal combustion (IC) engine, to increase the level of efficiency of driving assembly and to reduce air pollution. A hybrid electric vehicle combines the advantages of electric motor drive (no pollution and high available power at low speeds) and the advantages of IC engine (high dynamic performances and little pollution at high speeds). In the simulation of a hybrid electric vehicle SimPowerSystemsTM and SimDrivelineTM (MATLAB) were used.

Sound Insulation of Energy Efficient Facade Construction

Environmental noise affects a large number of people. It is estimated that 20% of the EU population, or around 80 million people live in conditions of unacceptable noise. Three key possibilities for community noise management are control at the source of noise, control at the path from source to receiver and protection at the place of reception. In all three cases, noise should be reduced to the lowest level achievable in the particular situation. This study deals with the problem of protection against community noise at the receiving site. The paper considers the energy efficient façade construction and how they contribute to the protection of noise in urban areas.