Thermodynamic analysis of a solar-driven multigenerationsystem applying a TEG system for power enhancement

In order to achieve sustainable development, humanity must focus on a low-carbon society. For thisreason, there is a growing interest in optimizing the design of various systems by exploiting naturalenergy sources such as solar, wind, geothermal, and biomass. Research on multiple productionsystems has received more attention in the past few decades in order to reduce energy consumptionand achieve more sustainable and economical energy production. The energy production process oftriple production is called a system with the production of three different outputs: electricity,hydrogen, oxygen, cooling, heating, hot water, freshwater, and air, which are economical with thesame input energy sources. In this thesis, a multi-generation energy system that works based onrenewable sources, namely solar energy, is introduced. The proposed system consists of four differentparts: the solar system is the main source of energy that uses solar energy. In addition to setting upother systems, it is used to produce domestic hot water. The second system consists of two simpleorganic Rankine cycles that use cyclohexane and isobutane as working fluids and are used to generatepower. The third system includes a double-effect absorption chiller that is used to produce cooling.The fourth system is a PEM electrolyzer to produce hydrogen. Moreover, in the second ORC system, aTEG unit is applied instead of the condenser. The simulation of the system and the solution of the usedequations have been done using EES engineering software. The effect of changing differentparameters on the proposed system has been investigated. The obtained results show that the proposedsystem has an energy efficiency of ۱۴.۱۶% and an exergy efficiency of ۱۰.۴۷ % based on theconsidered initial conditions.

Keywords:

Multigeneration system , TEG , Solar system , dual ORC cycle