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Publication type: Working paper – expertise – study
Title: Main equations and thermal characteristics of radiators
Authors: Zhang, Zhengji
Schiess, Ciril
Tillenkamp, Frank
et. al: No
DOI: 10.21256/zhaw-2536
Extent: 12
Issue Date: 3-May-2022
Series: IEFE Energy Papers
Series volume: 11, 3
Publisher / Ed. Institution: ZHAW Zürcher Hochschule für Angewandte Wissenschaften
Publisher / Ed. Institution: Winterthur
Language: English
Subjects: Radiator; Heat exchanger; Main equation; DIN EN442; Thermal characteristics; Eigen-constant; Eigen-parameter; Series connection of radiators
Subject (DDC): 620: Engineering
Abstract: Accurate calculations of radiator thermal performance were performed based on accurate considerations of the varying heat transfer coefficient on the radiator surface. Using a reference point, both the main equation for heat power output and the main equation for exit temperature were derived. Both equations allow the prediction of all other operating points, so that the complete thermal characteristics of a given radiator can be calculated directly from the reference point without having to consider the geometrical parameters of the radiator and the physical properties of the air under free convection. For performing the load regulation with the exit flow temperature as the target, e.g., reverse calculations for the exact setting of the mass flow were presented. Furthermore, the approaching equation contained in DIN EN442 was reviewed for its accuracy and application limitations. For designs and calculations, both the eigen-constant and the eigen-parameter were furthermore introduced, which greatly facilitates the experimental determination of the heat transfer coefficient. The established relationship between the power output and the surface area of radiators showed satisfactory agreement with the data available in the VDI Heat Atlas.
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Energy Systems and Fluid Engineering (IEFE)
Appears in collections:IEFE Energy Papers

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