Measurement of transient fluid temperature in the heat exchangers
Authors:
- Magdalena Jaremkiewicz
Abstract
In the chapter, a method for measuring the transient temperature of the flowing fluid based on time temperature changes of the thermometer is described. In the presented method, the thermometer is considered as an inertial system of first and second order. To reduce the influence of random errors in the temperature measurement, the local polynomial approximation based on nine points is used. As a result, the first and second derivatives of a temperature, which indicate how the temperature of the thermometer varies over time, are determined very accurately. Next, the time constant is defined as a function of fluid velocity for sheathed thermocouples with different diameters. The applicability of the presented method is demonstrated on real data in the experiment. The air temperature is estimated from measurements carried out by the three thermocouples having different outer diameters when the air velocity varied in time. A comparison of the computed temperatures of air gives confidence to the accuracy of the presented method. The method presented in this chapter for measuring the transient temperature of the fluid can be used for the online monitoring of fluid temperature change with time.
- Record ID
- CUTd1e71aa8205e437190a28b5694e8087e
- Publication type
- Publication categories
- ;
- Author
- Pages
- 175-192
- Other elements of collation
- rys.; tab.; Bibliografia (na s.) - 190-192; Bibliografia (liczba pozycji) - 24; Oznaczenie streszczenia - Abstr.
- Book
- Murshed S. M. Sohel, S. M. Sohel Murshed Lopes Manuel Matos Manuel Matos Lopes (eds.): Heat exchangers - design, experiment and simulation, 2017, Rijeka, InTech, ISBN 978-953-51-3094-9
- Keywords in English
- temperature measurement, transient conditions, first-order model, second-order model, time constant
- DOI
- DOI:10.5772/62693 Opening in a new tab
- URL
- https://www.intechopen.com/books/heat-exchangers-design-experiment-and-simulation Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 5
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTd1e71aa8205e437190a28b5694e8087e/
- URN
urn:pkr-prod:CUTd1e71aa8205e437190a28b5694e8087e
* 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.