Field evaluation of performance of radiant heating/cooling ceiling panel system

Li, Rongling; Yoshidomi, Togo; Ooka, Ryozo; Olesen, Bjarne W.

doi:10.1016/j.enbuild.2014.09.070

Cited by 77 publications

(29 citation statements)

References 9 publications

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“…ISO 11855 can be applied to an embedded surface system and thermally activated building system (TABS) which are integrated into the wall, floor, or ceiling without any open air gap [17]. For a testing method, EN 1264-5 defines the determination method of the heating capacity of the wall and ceiling heating surfaces, and the cooling capacity of the wall, ceiling and floor cooling systems [18].…”

Section: )mentioning

confidence: 99%

Ten questions about radiant heating and cooling systems

Rhee

Olesen²,

Kim

2017

Building and Environment

Self Cite

254

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Section: )mentioning

confidence: 99%

Ten questions about radiant heating and cooling systems

Rhee

Olesen²,

Kim

2017

Building and Environment

Self Cite

254

View full text Add to dashboard Cite

“…Interestingly, as the floor receives radiation from the ceiling directly and is therefore slightly warm, the draught from the cool window is limited. The floor temperature and consequently the room air temperature can be lower if the floor is not adiabatic and loses heat to the ground [23] (see limitations in Section 6). Figure 11 implies that the ceiling temperature can influence the form of air circulation in a room.…”

Section: Cfd Analysesmentioning

confidence: 99%

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

2019

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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. Forty combinations of simulation scenarios including six ceiling surface temperatures (20 °C, 25 °C, 28 °C, 33 °C, 38 °C, and 45 °C), two low- and high-performance facades, two rooms with one and two facades, and distances of 1 m and 3 m to the window were examined. The findings of this research show that the supply water temperatures between 28–45 °C from a heat pump are ideal for a building with a high-performance façade. Additionally, the results suggest that ceiling temperatures as low as 20–25 °C in renovated buildings and 25–28 °C in a building with low-performance facades can provide optimal thermal sensations at most body parts. This study also proves that the PMV comfort model (Predicted Mean Vote index) is not at all a suitable model for the evaluation of radiant heating systems (especially if occupants have winter clothes), even if the air/operative temperature distribution near an occupant is uniform.

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“…The performance of these systems is extensively analyzed in various recent studies. Most of the research is based on either computer simulations, mainly computational fluid dynamics (CFD) studies or studies conducted in controlled laboratory environments [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The research in real office settings is mainly focused on buildings located in warm and hot climate countries, dominated by cooling need [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Cooling Period Thermal Comfort Assessment in Modern Open Office Landscape in Estonia

Kiil

Simson

Thalfeldt

et al. 2019

Preprint

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Local thermal comfort (TC) and draught rate (DR) has been studied widely. There has been more meaningful research performed in controlled boundary condition situations than in actual work environments involving occupants. TC conditions in office buildings in Estonia have been barely investigated in the past. In this paper, the results of TC and DR assessment in five office buildings in Tallinn are presented and discussed. Studied office landscapes vary in heating, ventilation and cooling (HVAC) system parameters, room units and elements. All sample buildings were less than six years old, equipped with dedicated outdoor air ventilation system and room conditioning units. The on-site measurements consisted of TC and DR assessment with indoor climate questionnaire (ICQ). The purpose of the survey is to assess the correspondence between HVAC design and the actual situation. Results show, whether and in what extent the standard-based criteria for TC is suitable for actual usage of the occupants. Preferring one room conditioning unit type or system may not guarantee better thermal environment without draught. Although some HVAC systems observed in this study should create the prerequisites for ensuring more comfort, results show that this is not the case for all buildings in this study.

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Field evaluation of performance of radiant heating/cooling ceiling panel system

Cited by 77 publications

References 9 publications

Ten questions about radiant heating and cooling systems

Ten questions about radiant heating and cooling systems

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

A Comparative Study on Cooling Period Thermal Comfort Assessment in Modern Open Office Landscape in Estonia

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