​​​​Mohammad Saghafifar

Abstract 

The direct steam generator (DSG) solar power tower plant concept is receiving more attention due to its ability to provide superheated steam without any intermediate heat exchanger and heat transfer fluid. However, the literature on the time-dependent or quasi-static performance evaluation of these systems is limited. In this study, a thermoeconomic assessment of a DSG solar tower with a dual receiver mechanism integrated with a regenerative steam Ran...

Abstract 

The objective of this study is to develop and thoroughly evaluate several feasible hybrid trigeneration configurations based on a gas turbine combined cycle (GTCC) for generating electricity, freshwater, and cooling. Six hybrid configurations are developed by integrating different desalination and chiller systems to the GTCC. Desalination systems include multi effect distillation (MED) and reverse osmosis (RO) with pressure exchanger (PEX) and chiller...

Abstract 

In this review paper, an extensive overview of solar assisted carbon capture systems is presented. The focus of this paper is on possible integration schemes between solar thermal collectors and carbon capture systems. In its entirety, solar assisted carbon capture systems can be categorized into direct and indirect systems. This classification is applicable to all three possible processes, namely post-combustion, pre-combustion, and oxyfuel combustio...

Abstract 

Multigeneration systems provide substantial benefits in terms of improving efficiency and economics as well as environmental benefits. In this study, a multigeneration system is proposed for generating power and triple effect refrigeration at different evaporation temperatures. The system hybridizes a 25 MW recuperative Brayton cycle with an organic Rankine cycle (ORC) and an integrated refrigeration system that combines a branched generator–absorber...

Abstract 

Desalination market is experiencing continuous growth due to severe water scarcity in many parts of the globe. Because of the geographical coincidence of serious water scarcity and substantial direct normal irradiation potential, concentrated solar power (CSP) driven desalination presents a potential means to tackle water scarcity. Since CSPs can generate both electricity and thermal energy, they are excellent candidates to drive desalination technolo...

Abstract 

In this paper, an extensive overview of unconventional waste heat recovery power cycles is presented. The three-unconventional waste heat recovery bottoming cycles discussed in this paper are the air bottoming cycle, carbon dioxide-based power cycles and Kalina bottoming cycle. The review paper is divided into two parts; first part is about a detailed discussion of energy, exergy, economic analysis, as well as reviewing part load analysis, component d...

Abstract 

In this paper, a new technique is proposed for design and optimization of a heliostat field. The unique aspect of the proposed approach is the code's ability to design the field with non-equal heliostats. It has been argued that designing a field of non-equal heliostats improves the energy and economic performance of a heliostat field. On this account, a new code called AINEH (analysis of implementation of non-equal heliostats) was developed to evalua...

Abstract 

This paper, which is the first part of a study on multi-stage recuperative Brayton cycle configurations, evaluates the thermodynamic and economic feasibility of hybridizing different multi-stage recuperative Brayton cycle configurations with a solar power tower using a pressurized air receiver. In part 2 of this work, the waste energy recovery from non-solar multi-stage recuperative Brayton cycle configurations is evaluated from both thermodynamic and...

Abstract 

Steam turbine cycle's low operating temperature makes it suitable for waste heat recovery applications. Even though conventional combined cycles, ie, topping gas turbine and bottoming steam turbine cycles, are thermodynamically efficient, they are not the most economical alternatives for power generation with capacities less than 50 MWe. A recently proposed alternative is to utilize a bottoming gas turbine cycle in form of an air bottoming cycle. In t...