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Simulation of hybrid two‐tank storage concentrated solar plant using supercritical carbon dioxide in TRNSYS
Author(s) -
Ahmad Ali,
Abas Naeem,
Sarosh Ali,
Saleem Muhammad Shoaib
Publication year - 2020
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.155
Subject(s) - brayton cycle , trnsys , concentrated solar power , nuclear engineering , supercritical fluid , environmental science , process engineering , thermal energy storage , power station , turbine , gas compressor , combined cycle , supercritical carbon dioxide , mechanical engineering , materials science , thermodynamics , engineering , thermal , electrical engineering , physics
To meet heating demand without global warming is a huge target for the energy community these days. To attain this challenge, solar energy harvesting to meet domestic hot water demand is a promising solution. Carbon dioxide (CO 2 ) is becoming ever more significant as heat transporting fluid. Simulation‐based efficiency assessment models are requisite for analogous advances. This research presents a dynamic simulation model of high temperature concentrated solar plant using directly heated molten salt to indirectly power a supercritical CO 2 Brayton cycle. Target of the study is to achieve 1 MW generation and simulation work is performed in TRNSYS computer software. The operating conditions for the plant cycle and efficiency for indirectly heated CO 2 recompression Brayton cycle are also calculated with the help of engineering equation solver. The system is divided into three major loops: solar thermal heat collection, power generation, and heat recovery. Results have shown overall cycle efficiency up to 40%. During the day hours from 4688 to 4697, receiver provides a constant outlet temperature of 700°C with a fluid inlet flow rate of 15 kg/s and mediating fluid after exchanging heat enters the receiver's end at 524°C. An optimized value of 2.9 is selected as pressure ratio to meet supercritical conditions at the compressor inlet. Output power generated is 3.035 MW with turbine efficiency is 92%. The power calculated for main compressor and recompressor are 0.68 and 0.228 MW, respectively.