TJ867 : Practical evaluation of the vertical axis wind turbine for use in the compression refrigeration cycle
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2022
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Abstarct: Abstract
Considering the increase in energy demand worldwide, the search for a renewable energy source to meet the energy needs of refrigeration systems is a high priority. Refrigeration systems with wind power are considered as a measure to supply energy to these systems, especially those that do not even have access to the electricity grid. The present study proposes a hybrid system including a wind-powered condensing refrigeration cycle. Wind turbines are divided into two categories, horizontal axis and vertical axis, the first category has higher efficiency and cost and also has a more complex system and the second category has lower efficiency and cost and also has a simpler system than the first category. In this study, a Darius model H vertical axis wind turbine has been evaluated practically and theoretically in order to be connected to the compressor of a compression refrigeration cycle. The compressor used in the refrigeration cycle is of a mechanical type to receive the mechanical energy of the wind turbine directly and without intermediary. In the first part of this research, a practical evaluation of a Darius wind turbine built in Shahrood University of Technology has been done. The evaluation was aimed at determining the performance curves of the turbine at different wind speeds. To evaluate the wind turbine, the parameters of wind speed, rotational speed, torque, wind turbine power, etc. were measured and then the effect of changing the pitch angle of the wind turbine was also investigated. Also, the Qblade simulation software has been used to reach the points outside the test range, which were not possible to test the turbine due to technical reasons. The results obtained from the practical evaluation and simulation, despite the average error of 29.18% caused by the laboratory error, had a logical and similar trend. The optimal pitch angle for wind turbine blades is -8.5°, which is confirmed by the software simulation. In the next section, using the graphs obtained for the performance of the wind turbine, a suitable compressor was selected to be connected to the wind turbine, and the cooling load produced by this compressor was estimated at different wind speeds. Finally, by choosing a region near Shahrood city, while extracting the wind speed profile in that region, the performance of the proposed combined system has been evaluated throughout the year according to the wind speed data at two heights of 10 and 30 meters. The overall results showed that the most cooling produced in the hot seasons of the year, i.e. spring and summer, was 1169.1 and 592.9 kilowatt hours for a height of 10 meters and 1514.3 and 872.7 kilowatt hours for a height of 30 meters, respectively.
Keywords:
#Keywords: vertical axis wind turbine #compression refrigeration cycle #mechanical compressor #cooling load #wind speed. Keeping place: Central Library of Shahrood University
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