Detailed Thermal Evaluation of Brazed Plate Heat Exchanger Using Infrared Thermography. Issue 5 (30th March 2023)

• Record Type: Journal Article
• Authors: Will, Torsten; Schnabel, Lena; Köhler, Jürgen
• Other Names: Freund Hannsjörg guestEditor.; Sauer Jörg guestEditor.; Wachsen Olaf guestEditor.
• Is Part Of: Chemie Ingenieur Technik. Volume 95:Issue 5(2023)
• Page Start: 732
• Page End: 739
• Publication Date: 2023-03-30
• Subjects: Brazed plate heat exchanger -- Condensation -- Evaporation -- Heat transfer coefficient -- Infrared thermography; Chemical engineering -- Patents -- Periodicals; Chemical engineering -- Periodicals; Chemical industry -- Periodicals; Chemistry, Technical -- Periodicals; 660.05
• DOI: 10.1002/cite.202200215
• Languages: English
• ISSNs: 0009-286X

Abstract

Abstract: Infrared thermography of brazed plate heat exchangers for evaporators and condensers recently was used to quantify maldistribution. With the knowledge of the secondary fluids heat transfer coefficient and a given secondary fluids distribution, the local heat transfer coefficient of the primary fluid (refrigerant) and its distribution to the channels can be calculated. A sensitivity analysis shows ± 10 % difference of the surface temperature to the wall center temperature at the expected ratios of heat transfer coefficients. The method is presented in this paper using an exemplary infrared picture. Abstract : A new method for the evaluation of the local heat transfer coefficient inside brazed plate heat exchangers is presented. The method bases on infrared pictures and the assumption of identity of the plate center temperature and the surface temperature. The deviation of both temperatures for different heat transfer coefficients is analyzed.