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Heat and Mass Transfer Model for Cooling Tower and LiBr Regenerator in Turbine Inlet Chilling System

[+] Author Affiliations
Qin Chen

University of California, Irvine, Irvine, CA

Paper No. ES2015-49823, pp. V002T18A010; 9 pages
doi:10.1115/ES2015-49823
From:
  • ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
  • Volume 2: Photovoltaics; Renewable-Non-Renewable Hybrid Power System; Smart Grid, Micro-Grid Concepts; Energy Storage; Solar Chemistry; Solar Heating and Cooling; Sustainable Cities and Communities, Transportation; Symposium on Integrated/Sustainable Building Equipment and Systems; Thermofluid Analysis of Energy Systems Including Exergy and Thermoeconomics; Wind Energy Systems and Technologies
  • San Diego, California, USA, June 28–July 2, 2015
  • Conference Sponsors: Advanced Energy Systems Division, Solar Energy Division
  • ISBN: 978-0-7918-5685-7
  • Copyright © 2015 by ASME

abstract

A gas turbine normally suffers significant penalties in power output and heat rate during hot days. Turbine inlet chilling is an effective approach to reduce these penalties. Reducing the inlet air temperature increases the density of turbine inlet air and as a result, more air mass flow enters the compressor, resulting in more power produced. Cooling towers and liquid desiccant (Lithium Bromide, LiBr) regenerators are important components in a turbine inlet chilling system. Understanding of their heat and mass transfer performance, particularly the performance of LiBr regenerators, is of importance for system design and integration. 1-dimensional finite difference heat and mass transfer models were developed in this study to simulate the cooling capability of cooling towers and the efficiency of water removal of LiBr regenerators. The models were used to perform sensitivity analysis on the performance of the regenerator to understand the effects of major parameters such as Lewis factor (Lef), the ratio of the air to solution mass flow and the temperature of the LiBr solution at the inlet. The simulation results show that the performance is insensitive to Le. Reducing the ratio of the air to solution mass flow or increasing the temperature of the solution at the inlet increases the thermal efficiency of the regenerator.

Copyright © 2015 by ASME

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