Analytical-numerical method for calculating cross-flow tube heat exchangers considering temperature-dependent fluid heat capacities
Authors:
- Katarzyna Węglarz,
- Dawid Taler,
- Magdalena Jaremkiewicz,
- Jan Taler,
- Mateusz Marcinkowski
Abstract
The paper presents a mathematical model of a steam reheater in a steam boiler installed in a power unit of 1000 MW. A new numerical-analytical method was used to determine the temperature distribution of steam, flue gas, and the reheater’s tube walls. The reheater is a two-pass cross-current heat exchanger. There are 44 panels of tubes on the width of the boiler. The steam flows parallel through 20 pipes in each pass. An analytical model of the superheater was developed with the assumption of the constant physical properties of steam and flue gas. The results of steam and flue gas temperature calculations obtained by the proposed method were compared with the exact method’s results. Very high accuracy of estimates was attained even if the whole superheater is divided into a few control volumes. The results of the first and second pass steam temperature calculations were compared using the P-NTU (Effectiveness - Number of Transfer Units) method. A perfect match between the steam temperature and the average temperature of the flue gas at the outlet of the reheater was found. The advantage of the developed method of superheaters modeling is the possibility to model heat exchangers with complex flow systems. The calculations were also carried out for temperature-dependent physical properties of steam and flue gas.
- Record ID
- CUTb2f0155ef6ef41a8bdaeefff2f80af35
- Publication categories
- ;
- Author
- Journal series
- International Journal of Heat and Mass Transfer, ISSN 0017-9310, e-ISSN 1879-2189
- Issue year
- 2022
- Vol
- 183, Pt. C
- Pages
- [1-14]
- Article number
- 122202
- Other elements of collation
- rys.; tab.; wykr.; Bibliografia (na s.) - 14; Bibliografia (liczba pozycji) - 26; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 183, Pt. C
- Keywords in English
- new method for heat exchanger calculation, cross-flow tube heat exchanger, two-pass cross-co-current heat exchanger, steam reheater, analytical model of tube heat exchanger
- ASJC Classification
- ; ;
- DOI
- DOI:10.1016/j.ijheatmasstransfer.2021.122202 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S0017931021013016#! Opening in a new tab
- Language
- eng (en) English
- Score (nominal)
- 200
- Score source
- journalList
- Score
- Publication indicators
- Additional fields
- Indeksowana w: Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTb2f0155ef6ef41a8bdaeefff2f80af35/
- URN
urn:pkr-prod:CUTb2f0155ef6ef41a8bdaeefff2f80af35
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.