Performance evaluation of a solar hybrid system integrating a two-stage annular thermoelectric generator

Abstract

A novel cogeneration system made up of the dye-sensitized solar cell (DSSC), a solar selective absorber (SSA), and a two-stage annular thermoelectric generator (ATTEG) is developed in order to effectively use the solar energy captured by the DSSC. DSSC converts short-wavelength solar energy into electricity, while long-wave solar energy is converted into thermal energy by SSA to drive ATTEG for additional electricity. The mathematical equations for performance indicators of the hybrid system are derived in light of the numerous irreversible losses between DSSC and ATTEG, and the energy relationship between DSSC and ATTEG is investigated from the perspectives of energy and exergy, respectively. Moreover, a comprehensive comparison of the performance of the hybrid system with two-stage ATEG and single-stage ATEG is outlined under different solar irradiance and operating temperature. Furthermore, calculation result demonstrates that the energy and exergy efficiency of DSSC-ATTEG is 82.9% and 19.2% greater than a standalone DSSC when solar irradiation and thermoelectric components are given. Finally, detailed parameter analyses are performed. In addition to evaluating the conventional operating parameters, the effects of three important geometric parameters of ATTEG on the hybrid system are investigated, including annular shaped parameters, height ratio and angle ratio of thermoelectric elements. The outcomes can offer fresh ideals into the design and optimization of waste heat recovery from round shaped heat sources.