Comparison of potential control strategies for an impinging receiver based dish-Brayton system when the solar irradiation exceeds its design value. (1st August 2018)

• Record Type: Journal Article
• Authors: Wang, Wujun; Malmquist, Anders; Laumert, Björn
• Is Part Of: Energy conversion and management. Volume 169(2018)
• Page Start: 1
• Page End: 12
• Publication Date: 2018-08-01
• Subjects: Impinging solar receiver -- Solar dish -- Brayton cycle -- Control strategy -- Conjugate heat transfer; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2018.05.045
• Languages: English
• ISSNs: 0196-8904

Abstract

Abstract: Potential control strategies for an impinging receiver based dish-Brayton system have been presented for protecting the key components from the risks of overheating when the solar irradiation exceeds its design value. Two of them are selected for a detailed study: changing the effective diameter of the shading device and changing the inlet temperature. A rope-pulley shading device is developed for controlling the shading area in the center of the dish, and the change of the inlet temperature is achieved by applying a bypass at the cold side of the recuperator for reducing the heat transfer rate. Both control strategies can manage the peak temperature on the absorber surface within 1030 °C with an outlet temperature fluctuation between −4.1 and 15.1 °C, so that the impinging receiver can work for long time at any solar direct normal irradiance value. Furthermore, the temperature differences on the absorber surface are between 137.1 °C and 163.8 °C. The cases that are achieved by changing the shield effective diameter are significantly lower (11–26 °C) than the corresponding cases that are achieved by changing the inlet temperature.