Improving Air-Cooled Condenser Performance in Combined Cycle Power Plants
Publication: Journal of Energy Engineering
Volume 132, Issue 2
Abstract
It has been recognized in recent times that air-cooled condensers (ACCs) are environmentally preferable to the traditional water-cooled condensers for rejecting heat in combined-cycle power plants (CCPPs). However, a drawback of ACCs is that their performance can decline with increasing ambient air temperature. A new approach is proposed in this paper that has the potential to alleviate this drawback of ACCs. In this approach, a chilled-water thermal energy storage system (TES) is used to precool the inflow air to the ACC whenever the ambient air temperature increases above the design air inlet temperature. The temperature of the TES system is maintained by an absorption refrigeration system (ARS) driven by low-quality waste heat from the CCPP. A process model integrating the CCPP with the ARS and the TES has been developed to optimize the volume of the TES. A CCPP with steam turbine net output of was chosen to evaluate the application of this approach for a power plant to be located in southern New Mexico. This analysis showed that a tank volume of will be required to maintain the air temperature at the inlet to the ACC at the design value of throughout the year. Simulations under ambient air temperatures up to indicated that the proposed system is capable of maintaining the rated net power output of the plant with minimal fluctuations. Simulations also showed that TES tank volume is most sensitive to the design air inlet temperature to the ACC—an increase of this temperature by can result in at least 25% reduction in the volume.
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Information & Authors
Information
Published In
Journal of Energy Engineering
Volume 132 • Issue 2 • August 2006
Pages: 81 - 88
Copyright
© 2006 ASCE.
History
Received: Apr 5, 2005
Accepted: Nov 2, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
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