Design and Analysis of a Solar Energy Driven Tri-generation Plant for power, Heating and Refrigeration

2021 ◽  
pp. 1-21
Author(s):  
Dongchuan You ◽  
Akif Eren Tatli ◽  
Ashkan Ghanavati ◽  
Hameed Metghalchi
Keyword(s):  
Carbon Dioxide ◽  
Solar Energy ◽  
Pressure Ratio ◽  
Lithium Bromide ◽  
Operating Conditions ◽  
Exergetic Efficiency ◽  
Absorption System ◽  
Generation Plant ◽  
Aqueous Lithium Bromide ◽  
Recompression Cycle

Abstract A tri-generation plant producing power, heat and refrigeration has been designed and analyzed. Using solar energy as input. The power side of the plant employs supercritical carbon dioxide (sCO2) recompression cycle. The refrigeration side includes an aqueous lithium bromide absorption system. Thermal energy has been extracted from many places in the plant for heating purposes. A detailed thermodynamics model has been developed to determine performance of the plant for many different conditions. Thermal efficiency, energy effectiveness and exergetic efficiency of the system has been calculated for different operating conditions. It turns out that the pressure ratio of the recombination cycle and effectiveness of the energy exchanger for transferring energy from the power side to the refrigeration side play important roles.

On the Supercritical Carbon Dioxide Recompression Cycle

2021 ◽  
pp. 1-11
Author(s):  
Dongchuan You ◽  
Hameed Metghalchi
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Environmental Safety ◽  
Maximum Temperature ◽  
Exergetic Efficiency ◽  
Parametric Analyses ◽  
Recompression Cycle ◽  
Supercritical Carbon

Abstract Supercritical carbon dioxide Brayton (sCO2) cycle has been studied in recent years and its high efficiency and environmental safety has been investigated. One of the most promising sCO2 design is the Recompression cycle described in the Introduction of the paper. In this paper, an effort has been made to optimize operation of a recompression cycle by performing parametric analyses on pressure ratio, split fraction, and maximum temperature. The effects of varying these parameters on thermal efficiency as well as exergetic efficiency have been determined.

scholarly journals Non-Stoichiometric Redox Active Perovskite Materials for Solar Thermochemical Fuel Production: A Review

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 611 ◽  
Author(s):  
Anita Haeussler ◽  
Stéphane Abanades ◽  
Julien Jouannaux ◽  
Anne Julbe
Keyword(s):  
Carbon Dioxide ◽  
Solar Energy ◽  
Energy Conversion ◽  
Operating Conditions ◽  
Solar Fuel ◽  
Fuel Production ◽  
Concentrated Solar Energy ◽  
Redox Active ◽  
Conversion Rates ◽  
Wide Range

Due to the requirement to develop carbon-free energy, solar energy conversion into chemical energy carriers is a promising solution. Thermochemical fuel production cycles are particularly interesting because they can convert carbon dioxide or water into CO or H2 with concentrated solar energy as a high-temperature process heat source. This process further valorizes and upgrades carbon dioxide into valuable and storable fuels. Development of redox active catalysts is the key challenge for the success of thermochemical cycles for solar-driven H2O and CO2 splitting. Ultimately, the achievement of economically viable solar fuel production relies on increasing the attainable solar-to-fuel energy conversion efficiency. This necessitates the discovery of novel redox-active and thermally-stable materials able to split H2O and CO2 with both high-fuel productivities and chemical conversion rates. Perovskites have recently emerged as promising reactive materials for this application as they feature high non-stoichiometric oxygen exchange capacities and diffusion rates while maintaining their crystallographic structure during cycling over a wide range of operating conditions and reduction extents. This paper provides an overview of the best performing perovskite formulations considered in recent studies, with special focus on their non-stoichiometry extent, their ability to produce solar fuel with high yield and performance stability, and the different methods developed to study the reaction kinetics.

EVALUATION OF A COMBINED SOLAR-ASSISTED EJECTOR ABSORPTION CHILLER

2013 ◽  
Vol 42 (1) ◽  
pp. 56-60
Author(s):  
Kamaruzzaman Sopian ◽  
J. Abdulateef ◽  
M. Alghoul ◽  
K.S. Yigit
Keyword(s):  
Experimental Investigation ◽  
Heat Exchanger ◽  
Solar Energy ◽  
Operating Conditions ◽  
Working Fluid ◽  
Absorption System ◽  
Absorption Chiller ◽  
Maximum Increase ◽  
Evacuated Tube

The experimental investigation of the performance of a combined solar ejector absorption coolingsystem has been carried out. The system was installed in the solar energy park at University KebangsaanMalaysia. The influence of various operating conditions on the COP is studied using evacuated tube solarcollectors and NH3-H2O as working fluid. The results showed that, the absorption chiller provides high COPthan that of the conventional absorption system. The maximum COP of the cycle in the order of 0.6 when theimprovements of rectifier and solution heat exchanger are added while the maximum increase in COP in case ofcombined cycle is about 50% higher than the basic cycle. This study is provided an actual compact unit of 1.5cooling capacity and operated under real outside conditions for Malaysia and similar tropical regions.DOI: http://dx.doi.org/10.3329/jme.v42i1.15978

Design of a Centrifugal Turbo Compressor With the Working Fluid Water for the Operation in a Hybrid Sorption/Compression Heat Pump Cycle

2016 ◽  
Author(s):  
Thomas Eckert ◽  
Leo Dostal ◽  
Martin Helm ◽  
Christian Schweigler
Keyword(s):  
Heat Pump ◽  
High Speed ◽  
Fluid Dynamic ◽  
Pressure Ratio ◽  
Lithium Bromide ◽  
High Volume ◽  
Heat Pumps ◽  
Operating Conditions ◽  
Working Fluid ◽  
Turbo Compressor

In various applications the use of sorption chillers and heat pumps is limited by the available temperature level of the driving heat source or the heat sink for export of reject heat. These constraints can be overcome by integrating an efficient high-speed transonic turbo compressor into the internal cycle of a thermally driven water/lithium bromide absorption heat pump. The operation in a hybrid heat pump with the refrigerant water implies specific challenges for the design of the compressor: Saturation pressures in the sub-atmospheric range, low vapor density, high volume flows and a targeted pressure ratio of 3 result in high impeller tip speeds with machine Mach numbers close to 1. Here the authors present a theoretical design study based on a numerical simulation of a centrifugal compressor, targeted at the given operating conditions. Evaluation of the results is conducted with regard to the relevant thermodynamic and fluid mechanic figures. The optimization of the impeller geometry comprises both fluid dynamic behavior and structural stability.

scholarly journals Analysis of the Thermodynamic Potential of Supercritical Carbon Dioxide Cycles: A Systematic Approach

2017 ◽  
Author(s):  
Francesco Crespi ◽  
Giacomo Gavagnin ◽  
David Sánchez ◽  
Gonzalo S. Martínez
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Pressure Ratio ◽  
Operating Conditions ◽  
Inlet Temperature ◽  
Specific Work ◽  
Turbine Inlet Temperature ◽  
Fair Comparison ◽  
Modelling Assumptions ◽  
Supercritical Carbon

Since the renewed interest in supercritical carbon dioxide cycles, a large number of cycle layouts have been proposed in literature. These analyses, which are essentially theoretical, consider different operating conditions and modelling assumptions and thus the results are not comparable. There are also works that aim to provide a fair comparison between different cycles in order to assess which one is most efficient. These analyses are very interesting but, usually, combine thermodynamic and technical restrictions thus making it difficult to draw solid and general conclusions with regards to which the cycle of choice in the future should be . With this background, the present work provides a systematic thermodynamic analysis of twelve supercritical carbon dioxide cycles under similar working conditions, with and without technical restriction in terms of pressure and/or temperature. This yields very interesting conclusions regarding which the most interesting cycles are amongst those proposed in literature. Also, useful recommendations are extracted from the parametric analysis with respect to the directions that must be followed when searching for more efficient cycles. The analysis is based on efficiency and specific work diagrams with respect to pressure ratio and turbine inlet temperature in order to enhance their applicability to plant designs driven by fuel economy and/or footprint.

scholarly journals Analysis of the Thermodynamic Potential of Supercritical Carbon Dioxide Cycles: A Systematic Approach

2017 ◽  
Vol 140 (5) ◽  
Author(s):  
Francesco Crespi ◽  
Giacomo Gavagnin ◽  
David Sánchez ◽  
Gonzalo S. Martínez
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Systematic Approach ◽  
Pressure Ratio ◽  
Operating Conditions ◽  
Inlet Temperature ◽  
Specific Work ◽  
Turbine Inlet Temperature ◽  
Fair Comparison ◽  
Supercritical Carbon

After the renewed interest in supercritical carbon dioxide cycles, a large number of cycle layouts have been proposed in literature. These works, which are essentially theoretical, consider different operating conditions and modeling assumptions, and thus, the results are not comparable. There are also works that aim to provide a fair comparison between different cycles in order to assess which one is most efficient. These analyses are very interesting but, usually, they combine thermodynamic and technical restrictions, which make it difficult to draw solid and general conclusions with regard to which the cycle of choice in the future should be. With this background, the present work provides a systematic thermodynamic analysis of 12 supercritical carbon dioxide cycles under similar working conditions, with and without technical restriction in terms of pressure and/or temperature. This yields very interesting conclusions regarding the most interesting cycles in the literature. Also, useful recommendations are extracted from the parametric analysis with respect to the directions that must be followed when searching for more efficient cycles. The analysis is based on efficiency and specific work diagrams with respect to pressure ratio and turbine inlet temperature in order to enhance its applicability to plant designs driven by fuel economy and/or footprint.

scholarly journals Large Eddy Simulations of Strongly Non-Ideal Compressible Flows through a Transonic Cascade

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 772
Author(s):  
Jean-Christophe Hoarau ◽  
Paola Cinnella ◽  
Xavier Gloerfelt
Keyword(s):  
Compressible Flows ◽  
Flow Behavior ◽  
Pressure Ratio ◽  
Organic Rankine Cycle ◽  
Ideal Gas ◽  
Operating Conditions ◽  
Large Eddy Simulations ◽  
Working Fluid ◽  
Viscous Effects ◽  
Large Eddy

Transonic flows of a molecularly complex organic fluid through a stator cascade were investigated by means of large eddy simulations (LESs). The selected configuration was considered as representative of the high-pressure stages of high-temperature Organic Rankine Cycle (ORC) axial turbines, which may exhibit significant non-ideal gas effects. A heavy fluorocarbon, perhydrophenanthrene (PP11), was selected as the working fluid to exacerbate deviations from the ideal flow behavior. The LESs were carried out at various operating conditions (pressure ratio and total conditions at inlet), and their influence on compressibility and viscous effects is discussed. The complex thermodynamic behavior of the fluid generates highly non-ideal shock systems at the blade trailing edge. These are shown to undergo complex interactions with the transitional viscous boundary layers and wakes, with an impact on the loss mechanisms and predicted loss coefficients compared to lower-fidelity models relying on the Reynolds-averaged Navier–Stokes (RANS) equations.

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