12 Jul 2017
10:30
A104
P1: Energy 1
| 1. Investigation of Efficiency Improvement of an Induction Air Heater: a Thermal Analysis | ||
| Umit Unver, Ahmet Yuksel, Alper Kelesoglu and Fikret Yuksel (Yalova University, Turkey); Halil Unver (Kirikkale University, Turkey) | ||
| Induction furnaces are the systems that have been used extensively for,many years in the industry for metal heating purposes. Nowadays new,areas of uses for these systems are being researching and new systems,are developing for various purpose of use. In this study, it was aimed,to increase the thermal efficiency of an induction heater that is,designed to heat air with insulation and flow field improvements. It was,aimed to provide the required warm air to the conditioned environments,more efficiently with the two heaters which were developed in line with,the improvements according to the suggestions given in the previous,studies. Experimental investigations have been made on three different,flow rate values. Furthermore, in the first group tests, non-insulation,situation is examined. In the second group tests, insulation is applied,to the outside of windings and inlet-outlet flaps which constitute the,boundary of the control volume for the prevention of heat losses. The,obtained data were compared with K-0 and K-1 type induction heaters that,were examined in previous studies and the results are confirmed via CFD,analysis. In the analysis, it was determined that flow rate increase,the efficiency up to 9%, insulation and enlarging outlet cross section,increases the efficiency up to 13%. In the developed models, it was,observed that the thermal power transferred to air increased by 246 W on,average compared to K-0 and K-1 types. The thermal efficiency for K-2,and K-3 heaters was calculated to be 77.14% and 87.1% respectively at,steady state. | ||
| 2. Thermal comfort for typical educational research institution: A case study | ||
| Nikolina Pivac and Sandro Nižetić (University of Split, Croatia); Vlasta Zanki (HEP ESCO d.o.o., Croatia) | ||
| An experimental field study has been conducted for typical educational,research building facility (office building). The research data was,gathered by the systematic monitoring of the occupancy and adaptive,occupant behavior during the typical working day in the considered,building facility in the winter period. Different sensors and data,loggers (temperature, relative humidity, CO2, radiation, lux meter, and,blower door test) have been mounted in order to collect data for,analysis of thermal comfort conditions. Moreover, occupant surveys and,interviews in form of questionnaire were also brought to examine the,psychological and social impacts of the occupants. Based on the analysis,of the collected data, the most influential impacts are quantified and,addressed in order to serve as the helpful input data for development of,the occupant behavior models in typical office buildings. | ||
| 3. Comparison of the reactive control strategies in LV network with PV generation and storage | ||
| Dario Garozzo and Giuseppe Marco Tina (University of Catania, Italy) | ||
| The aim of this study is to analyze the different decentralized voltage,control strategies, based on the reactive power control of photovoltaic,inverters, in order to evaluate their impact in terms of reactive power,demanded from the external grid, due to the regulation, and active,losses in the network and in the PV inverters. In a second step, the,presence of battery energy storage systems in the network is considered,and further analysis are performed, in order to take into account the,overvoltage mitigation, due to the peak shaving of the batteries. All,the simulations are performed in MATLAB/SIMULINK, where the model of a,single phase low-voltage distribution network with distributed,generation sources is implemented. | ||
| 4. New technologies in precise agriculture and possibilities of application in Serbia | ||
| Miladin M. Ševarlić, Sofija Mladenović, Rade Nastić and Luka Živković (University of Belgrade, Serbia); Marko Živković (Delta Agrar, Serbia) | ||
| The constant growth of the world population increases the need for food.,Price level of food has a long-term growth on the world market. This,has a direct effect on the number of malnutrition people in the world.,Therefore, there are greater demands set upon the sustainable,agriculture in terms of optimization and lower production costs,,increase of yield and improving the quality of agricultural products,,but also the protection of the environment and human health. Under,certain condition application of new technologies (autonomous machines,,robots, drones and nanotechnology) in the system of precise agriculture,could respond to these requests. Innovations in agriculture can achieve,goals without the need for genetic modification of seeds and application,of total herbicides which are harmful to the health of both farmers and,consumers. In Serbia, the development of precision farming based on the,application of new technologies is in the stage of “pioneer” venture of,certain agribusiness companies. |