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Research Papers

Feasibility Study of an Innovative Dry-Cooling System With Phase-Change Material Storage for Concentrated Solar Power Multi-MW Size Power Plant

[+] Author and Article Information
Lorenzo Pistocchini

Mario Motta

Department of Energy,  Politecnico di Milano, Via Lambruschini 4, 20156 Milano, Italy

J. Sol. Energy Eng. 133(3), 031010 (Jul 25, 2011) (8 pages) doi:10.1115/1.4004268 History: Received January 26, 2011; Revised April 14, 2011; Published July 25, 2011; Online July 25, 2011

This work concerns the economic potential assessment of an innovative hybrid-cooling system for steam condensation in concentrated solar power plants. The system consists of an air-cooled condenser (ACC) working in parallel to a latent heat storage with phase-change material (PCM). The purpose of the hybrid system is to store some of the latent heat of steam condensation during the turbine operation and reject it at night, in order to shift a share of the cooling work and exploit the high diurnal temperature range of desert areas. System’s energy and economic performances are assessed by the parametric analysis of a theoretical case study, referred to an existing solar power plant and based on historical meteorological data. The analysis considers an ideal “perfect” PCM storage system, namely with no technological barriers, and different cost scenarios. The simulation campaign outcome indicates how the innovative solution can provide just a slight improvement of the plant performance, which is anyway significant in qualitative terms since the risk of breakdowns of turbine operation during the hottest summer days is avoided. It is remarkable that the introduction of the heat storage allows for a reduction of the ACC installed power. The economic feasibility of the proposed solution follows on mainly from the comparison between the investment cost increase —due to the PCM storage—and savings—due to reduction of the installed ACC modules. The hybrid-cooling system would be an attractive alternative to standard systems if the PCM storage cost could be contained by increasing the conductivity of the PCM material. As an alternative, a cheaper heat storage technology (e.g., a water thermocline) could be coupled to an indirect-cooling system.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Operation scheme of the hybrid-cooling system: (a) steam condensation during turbine operation; (b) PCM regeneration during night hours

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Figure 2

Simplified scheme of the CSP plant using hybrid-cooling concept

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Figure 3

Block diagram showing the calculation procedure for the parametric analysis

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Figure 4

Annual energy performance of a sample of the analyzed cases

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Figure 5

Parametric analysis results for the different cost scenarios—economic gain of the best cases in terms of NPV difference, related to the average energy cost and the average nominal condensing temperature

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Figure 6

Parametric analysis results for the different cost scenarios—technical parameters of the best cases related to the average energy cost and average nominal condensing temperature

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