Exergy Analysis of a Pilot Parabolic Solar Dish-Stirling System

Abstract

Energy and exergy analyses were carried out for a pilot parabolic solar dish-Stirling System. The system was set up at a site at Kerman City, located in a sunny desert area of Iran. Variations in energy and exergy efficiency were considered during the daytime hours of the average day of each month in a year. A maximum collector energy efficiency and total energy efficiency of 54% and 12.2%, respectively, were predicted in July, while during the period between November and February the efficiency values were extremely low. The maximum collector exergy efficiency was 41.5% in July, while the maximum total exergy efficiency reached 13.2%. The values of energy losses as a percentage of the total losses of the main parts of the system were also reported. Results showed that the major energy and exergy losses occurred in the receiver. The second biggest portion of energy losses occurred in the Stirling engine, while the portion of exergy loss in the concentrator was higher compared to the Stirling engine. Finally, the performance of the Kerman pilot was compared to that of the EuroDish project.

Krank kaydırmalı bir stirling motorunun termodinamik performansının nodal analiz ile incelenmesi

“…Girdiler belirlenirken motorun en az 3 kW güç üretmesi hedeflenmiştir. Isıtıcı sıcaklığı tayin edilirken, Güneş enerjisi alanında yapılan deneysel çalışmalar dikkate alınmıştır [29]. Türkiye'nin coğrafi konumu da dikkate alınarak bu çalışmadaki ısıtıcının efektif çalışma sıcaklığı 800 K olarak kabul edilmiştir.…”

A novel solar-fuel assisted thermophotovoltaic system and parametrical analysis

“…However, if too much solar radiation is introduced to preheat the air, it will also bring higher costs and safety hazards to the system, so the ratio of solar energy to fuel input can be controlled at about 1. . The solar radiation calculation model in [40] is used in this study. The Hangzhou City of China is taken as an example (Longitude: 120.1°; Latitude: 30.2°).…”

The effects of different channel geometries in the displacer cylinder, working fluids, and engine speed on the energy and exergy performance characteristics of a β-type Stirling engine with a slider-crank drive mechanism

“…Accordingly, they indicated that the compression ratio did not affect the second law of thermodynamics efficiency of the regenerator and efficiency decreased significanty with the increased dead volume level in the system. Gholamalizadeh and Chung 28 applied thermodynamic analysis to a pilot parabolic solar dish-Stirling engine system established in Kerman (Iran). In the analyses carried out in light of the data acquired as a result of the observations throughout the year, the researchers emphasized that energy efficiency was quite low between November and February, whereas the highest exergy efficiency was 13.2% in July.…”