Journal
RENEWABLE ENERGY
Volume 196, Issue -, Pages 1017-1028Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.07.057
Keywords
Photovoltaic; thermal system; Vortex tube; Natural gas pressure reduction station; Multi -objective optimization
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The study investigates the feasibility of replacing water bath heater and pressure relief valve with a hybrid vortex tube-photovoltaic/thermal system in pressure reduction stations. The system can effectively reduce natural gas pressure and generate electricity, leading to reduced CO2 emission.
The goal of this study is to investigate the possibility of replacing the water bath heater and pressure relief valve with a hybrid vortex tube-photovoltaic/thermal system in pressure reduction stations like city gate stations. By using this system, both the natural gas pressure can be reduced to the desired level (from 5-7 MPa to 1.5-2 MPa) and electricity can be generated. The effect of cold mass fraction of vortex tube (0.01-0.1), air mass flow rate (0.569-5.69 kg/s) as well as the length (1-10 m), width (0.5-5 m) and depth (0.1-0.5 m) of the photovoltaic/thermal system on the energy and exergy performance of the hybrid vortex tube-photovoltaic/thermal system is investigated. Then, the genetic algorithm based twoobjective optimization is used to find the appropriate value of these parameters to maximize the annual average first-law efficiency (hI) and second-law efficiency (hII) of the hybrid system. It was found that the hI and hII of the optimal system are respectively 74.05% and 19.46%. Moreover, it was observed that the use of optimal system causes a reduction in the CO2 emission by 27.7-tons per year. (c) 2022 Elsevier Ltd. All rights reserved.
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