Determining the Optimum Inner Diameter of Condenser Tubes Based on Thermodynamic Objective Functions and an Economic Analysis

Rafał Laskowski , Adam Smyk , Artur Rusowicz , Andrzej Grzebielec

Abstract

The diameter and configuration of tubes are important design parameters of power condensers. If a proper tube diameter is applied during the design of a power unit, a high energy efficiency of the condenser itself can be achieved and the performance of the whole power generation unit can be improved. If a tube assembly is to be replaced, one should verify whether the chosen condenser tube diameter is correct. Using a diameter that is too large increases the heat transfer area, leading to over-dimensioning and higher costs of building the condenser. On the other hand, if the diameter is too small, water flows faster through the tubes, which results in larger flow resistance and larger pumping power of the cooling-water pump. Both simple and complex methods can be applied to determine the condenser tube diameter. The paper proposes a method of technical and economic optimisation taking into account the performance of a condenser, the low-pressure (LP) part of a turbine, and a cooling-water pump as well as the profit from electric power generation and costs of building the condenser and pumping cooling water. The results obtained by this method were compared with those provided by the following simpler methods: minimization of the entropy generation rate per unit length of a condenser tube (considering entropy generation due to heat transfer and resistance of cooling-water flow), minimization of the total entropy generation rate (considering entropy generation for the system comprising the LP part of the turbine, the condenser, and the cooling-water pump), and maximization of the power unit’s output. The proposed methods were used to verify diameters of tubes in power condensers in a200-MW and a 500-MW power units.
Author Rafał Laskowski ITC
Rafał Laskowski,,
- The Institute of Heat Engineering
, Adam Smyk ITC
Adam Smyk,,
- The Institute of Heat Engineering
, Artur Rusowicz ITC
Artur Rusowicz,,
- The Institute of Heat Engineering
, Andrzej Grzebielec ITC
Andrzej Grzebielec,,
- The Institute of Heat Engineering
Journal seriesEntropy-Switz, ISSN 1099-4300
Issue year2016
Vol18
No12
Pages1-20
Publication size in sheets22.2
Keywords in Englishpower plant condenser, minimization of entropy generation rate, technical and economic optimisation of condenser tube diameter
DOIDOI:10.3390/e18120444
URL http://www.mdpi.com/1099-4300/18/12/444
Languageen angielski
Score (nominal)30
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 1.821 (2) - 2016=1.947 (5)
Citation count*5 (2018-02-19)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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