Sensible heat effectiveness of rotary heat exchangers at low rotational speeds

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00383493" target="_blank" >RIV/68407700:21220/25:00383493 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.enbuild.2025.115905" target="_blank" >https://doi.org/10.1016/j.enbuild.2025.115905</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.enbuild.2025.115905" target="_blank" >10.1016/j.enbuild.2025.115905</a>

Result language

angličtina

Original language name

Sensible heat effectiveness of rotary heat exchangers at low rotational speeds

Original language description

The paper describes various methods for determining the sensible thermal effectiveness of rotary regenerative heat exchangers. These include standard methods using ε - NTU correlations, advanced simulation models using computational fluid dynamics (CFD) and experimental methods. The paper focuses on heat exchangers designed for HVAC systems (typically C* = 1). A total of 7 different heat wheel geometries were investigated in the range of NTU from 1 to 10 over a wide range of thermal wheel rotational speeds from 0 to 16 rpm. The main target of the research was to study heat exchanger behaviour at low rotor speed. Extensive measurements of rotary regenerative heat exchangers were carried out and the measurement results were compared with the results of simulations in ANSYS Fluent as well as with the results of standard ε - NTU calculation methods. It was found that the results of the standard ε - NTU models and the measured data are not corresponding. On the other hand, a very good agreement was found between the measured results and the CFD simulations. Based on the analyses, a new ε - NTU correlation was proposed, which describes the exchanger behaviour very well even at low rotational speeds of the heat wheel. It was shown that the sensible effectiveness of the rotary heat exchanger predicted by the proposed correlation corresponds well with the measured values within a measurement uncertainty of ± 1.3 %. The proposed correlation method can be used to compare different rotor winding geometries prior to their production, e.g. to verify whether they meet EU Ecodesign requirements, meet the operation requirements, etc., reducing the cost of optimization and testing of new designs.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/TK05020003" target="_blank" >TK05020003: Development of a new generation of rotary regenerative heat exchanger</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Energy and Buildings

ISSN

0378-7788

e-ISSN

1872-6178

Volume of the periodical

342

Issue of the periodical within the volume

5

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

17

Pages from-to

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UT code for WoS article

001504548900001

EID of the result in the Scopus database

2-s2.0-105005874275