engleski

Performance investigation of a solar tower assisted CO2 gas cycle with integrated ORC

Supercritical CO2 gas cycles have become very attractive in the last decades because of their low operating temperatures. Supercritical CO2 is a fluid state of carbon dioxide where it is held above its critical point. The density at that point is similar to that of a liquid and allows for the pumping power needed in a compressor to be significantly reduced, thus significantly increasing the thermal-to-electric energy conversion efficiency. Since these systems can be driven by waste heat or solar energy, they can be assumed as environmentally friendly power energy generation systems. In addition, CO2 as a working fluid has favorable properties such as low environmental impact in terms of GWP and ODP, safety, availability, and cost. The primary goal of this study is to carry out thermodynamic assessment of a solar assisted novel supercritical CO2 gas cycle integrated with an organic Rankine cycle. The heat energy demand for the CO2 gas cycle is supplied by a solar tower. The rejected heat from the gas cycle is utilized for power generation from the organic Rankine cycle. For the organic Rankine cycle, four different working fluids are taken into consideration for comparison purposes: CO2, hfo-1234yf, R600a, and R134a. The effects of the different working fluids on the performance of the organic Rankine cycle are investigated through parametric studies.

Supercritical ; CO2 ; Gas Cycle ; ORC ; Solar Tower

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