Sensible heat effectiveness of rotary heat exchangers at low rotational speeds

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Sensible heat effectiveness of rotary heat exchangers at low rotational speeds

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Sensible heat effectiveness of rotary heat exchangers at low rotational speeds

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/TK05020003" target="_blank" >TK05020003: Vývoj rotačního regeneračního výměníku nové generace</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Energy and Buildings

ISSN

0378-7788

e-ISSN

1872-6178

Svazek periodika

342

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

—

Kód UT WoS článku

001504548900001

EID výsledku v databázi Scopus

2-s2.0-105005874275