Energy and exergy analyses of an integrated solar-based desalination quadruple effect absorption system for freshwater and cooling production

Progress in Sustainable Energy Technologies: Generating Renewable Energy

Rosen

2014

The current literature on integrated energy systems for various applications is discussed and how energy systems are integrated for multigeneration purposes is explained. Three integrated energy systems, including renewable and non-renewable ones, are considered to enhance the analyses. A micro-gas turbine integrated system is selected as the non-renewable system while biomass and ocean thermal energy conversion based energy systems are considered as the renewable options. Exergy analysis is conducted to determine the irreversibilities in each component and the system performance. Furthermore, economic and environmental impact assessments of the systems are conducted, and the results are presented for each integrated system. The results show that the integrated energy systems have higher exergy efficiency compared to single generation unit and that the integration results in reduction of greenhouse gases emission. The performances of the three systems are compared, and the results show that the choice and benefits of integrated systems strongly depends on the priorities of the designers and engineers.Keywords Energy · Exergy · Efficiency · Integrated energy system IntroductionEnergy use is directly linked to well-being and prosperity across the world. Meeting the growing demand for energy in a safe and environmentally responsible manner is an important challenge. A key driver of energy demand is the human desire to sustain and improve ourselves, our families and our communities. There are around 7 billion people on Earth and population growth will likely lead to an increase in energy demand, which depends on the adequacy of energy resources. Increasing population

Section: Cogeneration Heat and Power (Chp) Systemsmentioning

confidence: 99%

Performance Evaluation of Integrated Energy Systems

Ahmadi

Progress in Sustainable Energy Technologies: Generating Renewable Energy

Rosen

2014

“…Numerous researchers have addressed various issues and tackled with numerous aspects of solar power production [1][2][3][4][5][6][7][8]. Experimental and theoretical studies carried out by several researchers have shown that solar photovoltaic or photovoltaic thermal technologies are best suited for independent power and heat production.…”

Section: Introductionmentioning

confidence: 99%

Transient Energy and Exergy Analyses of a Solar Based Integrated System

Rabbani

Ratlamwala

Journal of Solar Energy Engineering

2014

Self Cite

The present study focuses on transient energy and exergy analyses of an integrated heliostat field, gas-turbine cycle and organic Rankine cycle system capable of generating power and heat in a carbon-free manner. A parametric study is carried out to ascertain the effect of varying the exit temperature of salt and the pressure ratio (PR) on the net work output, rate of heat lost from the receiver, and energy and exergy efficiencies for 365 days of the year and from 10:00 am to 2:00 pm. The results are obtained for the city of Toronto, Canada and indicate that the net work output increases from 1481 to 3339 kW with a rise in the exit salt temperature from 1200 to 1600 K. The energy and exergy efficiencies of the integrated system vary from 0.72 to 0.78 and 0.36 to 0.46, respectively, with a rise in the exit salt temperature. The energy and exergy efficiencies vary from 0.68 to 0.73 and 0.35 to 0.39, respectively, with an increase in the PR from 10 to 20.

“…Molten salts are treated as one of the most applicable heat storage materials, especially in solar energy–based power plants due to their low cost and high density, which has a vital importance, particularly in renewable‐based integrated systems, due to their fluctuation and instability. By utilizing thermal energy storage subsystem in a renewable energy–based power plants, electricity, hydrogen, heating and cooling, and freshwater can be produced when it is needed.…”

Section: Introductionmentioning

confidence: 99%

“…In a comprehensive study, Ratlamwala et al performed a thermodynamic analysis to evaluate a co‐generation system integrated with the solar energy to produce freshwater. They calculated energetic and exergetic coefficient of performances for the cooling part and conducted parametric studies to evaluate the effect of various parameters such as operating temperature on the freshwater production rate and system efficiency.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a solar tower power plant integrated with thermal energy storage system for cogeneration

Sorgulu

2018

Int J Energy Res

Summary In the current study, a solar tower–based energy system integrated with a thermal energy storage option is offered to supply both the electricity and freshwater through distillation and reverse osmosis technologies. A high‐temperature thermal energy storage subsystem using molten salt is considered for the effective and efficient operation of the integrated system. The molten salt is heated up to 565°C through passing the solar tower. The thermal energy storage tanks are designed to store heat up to 12 hours. The temperature variations in the storage tanks are studied and compared accordingly for evaluation. The effect of operating temperatures on the freshwater production and overall system efficiency is determined. About 24.46 MW electricity is generated in the steam turbine under sunny conditions. Furthermore, the storage subsystem stores heat during sunny hours to utilize later in cloudy hours and night time. The produced power decreases to 20.17 MW in discharging hours due to temperature decrease in the tank. The electricity generated by the system is then used to produce freshwater through the reverse osmosis units and also to supply electricity for the residential use. A total flowrate of 240.02 kg/s freshwater is obtained by distillation and reverse osmosis subsystems.