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Evaluation of Radiant Heating Ceiling Based on Energy and Thermal Comfort Criteria, Part II: A Numerical Study

Safi Zadeh, M. Reza; Watly, Lukasz; Wagner, Andreas

Abstract:
Large-surface radiant heating ceiling systems favor energy-efficient solutions on the heat generation side because of the relatively low temperature of the heat transfer medium. Additionally, their application in the renovation of existing buildings is relatively uncomplicated and requires minimal changes to the building’s construction. However, ASHRAE Standard-55 and former studies by Fanger indicated that among large-surface radiant systems, the highest percentage of dissatisfaction for an equal radiant temperature asymmetry (RTA) was reported for a warm ceiling. The maximum RTA of 4 K corresponding to 5% of dissatisfaction was suggested. In the first part of our study (subjective experiments), we have suggested the RTA of about 7.4 K if occupants have winter clothing (Safizadeh et al., 2018). However, former studies tested radiant ceiling systems at different temperatures in “neutral conditions” with a constant operative temperature, which rarely occurs in reality. Accordingly, the goal of this study is to evaluate the potential application of low-temperature radiant heating ceilings in a building with low- and high-performance facades using steady-state simulations with a coupled CFD–thermal comfort model and transient simulations using TRNSYS. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000098220
Veröffentlicht am 11.09.2019
Originalveröffentlichung
DOI: 10.3390/en12183437
Coverbild
Zugehörige Institution(en) am KIT Institut Entwerfen und Bautechnik (IEB)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000098220
Erschienen in Energies
Band 12
Heft 18
Seiten Art.-Nr.: 3437
Vorab online veröffentlicht am 06.09.2019
Schlagworte radiant heating ceiling; radiant temperature asymmetry; local thermal sensation; CFD; UCB thermal comfort; PMV; TRNSYS
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