 Verification and Improving the Heat Transfer Model in Radiators in the Wide Change Operating ParametersMieczysław Dzierzgowski
Energies, 2021, vol. 14, issue 20, 1-30 Abstract: Laboratory measurements and analyses conducted in a wide range of changes of water temperature and mass flow rate for different types of radiators allowed to provides limitations and assessment of the current radiators heat transfer model according to E N 442. The inaccuracy to determinate the radiator heat output according to E N 442, in case of low water mass flow rates may achieve up to 22.3% A revised New Extended Heat Transfer Model in Radiators NEHTMiR md is general and suitable for different types of radiators both new radiators and radiators existing after a certain period of operation is presented. The N E H T M i R m d with very high accuracy describes the heat transfer processes not only in the nominal conditions—in which the radiators are designed, but what is particularly important also in operating conditions when the radiators water mass flow differ significantly from the nominal value and at the same time the supply temperature changes in the whole range radiators operating during the heating season. In order to prove that the presented new model N E H T M i R m d is general, the article presents numerous calculation examples for various types of radiators currently used. Achieved the high compatibility of the results of the s i m u l a t i o n calculations with the m e a s u r e m e n t results for different types of radiators: iron elements (not ribbed), plate radiators (medium degree ribbed), convectors (high degree ribbed) in a very wide range of changes in the water mass flow rates and the supply temperature indicates that a verified NEHTMiR md can also be used in designing and simulating calculations of the central heating installations, for the rational conversion of existing installations and district heating systems into low temperature energy efficient systems as well as to directly determine the actual energy efficiency , also to improve the indications of the heat cost allocators . In addition, it may form the basis for the future modification of the European Standards for radiator testing. Keywords: radiator heat transfer; radiator efficiency; mass flow rate change; radiator temperature profile; radiator mean temperature (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:14:y:2021:i:20:p:6543-:d:654170 Access Statistics for this article Energies is currently edited by Ms. Agatha Cao More articles in Energies from MDPI |
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