Study of Vortex Systems as a Method to Weakening the Urban Heat Islands within the Financial District in Large Cities

Luis Rodriguez-Lucas, Chen Ning, Marcelo Fajardo-Pruna and Yugui Yang
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Luis Rodriguez-Lucas: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Chen Ning: School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
Marcelo Fajardo-Pruna: School of Mechanical Engineering and Production Sciences, ESPOL Polytechnic University, Guayaquil 09-01-5863, Ecuador
Yugui Yang: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China

Sustainability, 2021, vol. 13, issue 23, 1-29

Abstract: This paper presents a new concept called the urban vortex system (UVS). The UVS couples a vortex generator (V.G.) that produces updraft by artificial vortex and a vortex stability zone (VSZ) consisting of an assembly of four buildings acting as a chimney. Through this system, a stable, upward vortex flow can be generated. The Reynolds Averaged Navier–Stokes (RANS) simulation was carried out to investigate the flow field in the UVS. The Renormalized Group (RNG) k–ε turbulent model was selected to solve the complex turbulent flow. Validation of the numerical results was achieved by making a comparison with the large-size experimental model. The results reported that a steady-state vortex could be formed when a vapor-air mixture at 2 m/s and 450 K enters the vortex generator. This vortex presented a maximum negative central pressure of −6.81 Pa and a maximum velocity of 5.47 (m/s). Finally, the similarity method found four dimensionless parameters, which allowed all the flow characteristics to be transported on a large scale. The proposed large-scale UVS application is predicted to be capable, with have a maximum power of 2 M.W., a specific work of 3 kJ/kg, buildings 200-m high, and the ability to generate winds of 6.1 m/s (20 km/h) at 200 m up to winds of 1.5 m/s (5 km/h) at 400 m. These winds would cause the rupture of the gas capsule of the heat island phenomenon. Therefore, the city would balance its temperature with that of the surrounding rural areas.

Keywords: air remediation; numerical simulation; urban climate; vortex engine; urban heat island (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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