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Open AccessArticle

Earth-Cooling Air Tunnels for Thermal Power Plants: Initial Design by CFD Modelling

Department of Thermal and Fluid Engineering, University Carlos III of Madrid, Avenida de la Universidad 30, Leganés, 28911 Madrid, Spain
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Energies 2020, 13(4), 797; https://doi.org/10.3390/en13040797 (registering DOI)
Received: 13 December 2019 / Revised: 29 January 2020 / Accepted: 8 February 2020 / Published: 12 February 2020
(This article belongs to the Section Energy and Environment)
Climate change and the increase of the consumption of energy resources are expected to further strain anticipated water stress scenarios. The operation of existing thermal plants depends greatly on their cooling capacity, for which large amounts of water are withdrawn and consumed. Dry-cooling systems, on the other hand, do not require water, but they are less efficient and more expensive relative to conventional water-based systems, because of their dependency on the ambient temperature. This paper introduces the new idea of replacing water-based cooling systems in thermal power plants with earth-cooling air tunnels. Based on the concept of existing earth-air heat exchangers, the system takes advantage of the low and relatively constant underground temperature for cooling ambient air before it is introduced in the air condenser of the plant. In this work, we present an initial design of such an open-loop system for a 20 MW concentrated solar power plant. A sensitivity study of both geometric and flow parameters is realized using computational fluid dynamics simulations. Under the requirements of the study, we find that a system using a design of pipes with 0.5 m diameter and about 300 m length can be considered a technically viable zero-water alternative to water-cooling technologies.
Keywords: cooling systems; air-cooling systems; power plants; climate change; zero water use; water scarcity cooling systems; air-cooling systems; power plants; climate change; zero water use; water scarcity
MDPI and ACS Style

de la Rocha Camba, E.; Petrakopoulou, F. Earth-Cooling Air Tunnels for Thermal Power Plants: Initial Design by CFD Modelling. Energies 2020, 13, 797.

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