جستجوی مقالات مرتبط با کلیدواژه « tracker » در نشریات گروه « مکانیک »

Scheffler fixed focus concentrator is used for domestic and industrial applications in various parts of the world. This concentrator has an elliptical frame and designed in such a way that can provide fixed focus during a year with proper rotation. In this research, design and manufacturing principles of a Scheffler standing concentrator with an area of 2.7 m2 is presented. To this end, concentrator and its receivers were designed using Solidworks software.. Thermal efficiency of a manufactured concentrator was obtained from its operation for many days with different conditions. The results show that a concentrator with an area of 2.7 m2 can provide incident radiation up to 9.82 times that on the horizontal surface at the focal point. In addition, results of the experiment show that this concentrator can provide enough heat for boiling of 12 liters of water in less than 2 hours. A thermal efficiency of 37% was obtained for a receiver with surface of black color and glass cover. Finally, the standing concentrator was used to heat 100 lit of water resulting in an increase of water temperature to 60 °C.

A solar electric-vapor compression refrigeration (SE-VCR) system has been proposed in this study. The SE-VCR system was investigated for different evaporating temperatures and months in Isfahan city. The system is simulated by software TRNSYS. the hourly cooling load capacities (heat gain) of a sample building during the different days were determined by using meteorological data such as hourly average solar radiations and atmospheric temperatures. The hourly total heat gain of the sample building and the hourly variations of various parameters such as coefficient of the performance, condenser capacity and compressor power consumption were calculated. the minimum photovoltaic panel surface area was determined to meet the compressor power demand according to the hourly average solar radiation data. also the economic calculations were performed for various sizes of solar system and It was found that adding solar system, is economically. also the annual consumption of carbon in the amount of 1241 kg for cooling saves.