Full scale laboratory experiment on the cooling capacity of a radiant floor system

Pantelic, Jovan; Schiavon, Stefano; Ning, Baisong; Burdakis, Eleftherios; Raftery, Paul; Bauman, Fred

doi:10.1016/j.enbuild.2018.03.002

Cited by 35 publications

(10 citation statements)

References 23 publications

(25 reference statements)

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“…may not be close to indoor ! in spaces with direct solar heat gains [18][19][20][21][22], but that solar heat gain can have a lesser effect on internal surface temperatures where a radiant cooled floor is present compared to the same conditions with an all-air cooling system [18,21,20].…”

Section: Introductionmentioning

confidence: 99%

Comparison of mean radiant and air temperatures in mechanically-conditioned commercial buildings from over 200,000 field and laboratory measurements

Dawe

Raftery

Woolley

et al. 2020

Energy and Buildings

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We assessed the difference between mean radiant temperature (! ) and air temperature (! ) in conditioned office buildings to provide guidance on whether practitioners should separately measure ! or operative temperature to control heating and cooling systems. We used measurements from 48 office buildings in the ASHRAE Global Thermal Comfort Database, five field studies in radiant and all-air buildings, and five test conditions from a laboratory experiment that compared radiant and all-air cooling. The ASHRAE Global Thermal Comfort Database is the largest of these three datasets and most representative of typical thermal conditions in an office; in this dataset the median absolute difference between ! and ! was 0.4 (with 5 th , 25 th , 75 th , and 95 th percentiles = 0.2, 0.2, 0.6, and 1.6 °C). More specifically, the median difference shows that was 0.4 warmer than (with 5 th , 25 th , 75 th , and 95 th percentiles = -0.4 °C, 0.2 °C, 0.6 °C, and 1.6 °C). The laboratory experiments revealed that in a radiant cooled space ! was significantly (p<0.05) cooler than ! (average difference -0.1 ! ), while in the all-air cooled space ! was significantly (p<0.05) warmer than ! (average difference +0.3 ! ). These observations indicate that ! and ! are typically closer in radiant cooled spaces than in all-air cooled spaces. Although the differences are significant, the effect sizes are negligible to small based on Cohen's d and Spearman's rho. Therefore, we conclude that measurement of ! is sufficient to estimate ! under typical office conditions, and that separate measurement of ! or operative temperature is not likely to have practical benefits to thermal comfort in most cases -this is especially true for buildings with radiant systems. Furthermore, spatial and temporal variations in ! can be greater than or equal to the difference between ! and ! at any one location in a thermal zone, thus we expect that such variations typically have a greater impact on occupant thermal comfort than the differences between ! and ! .

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Section: Introductionmentioning

confidence: 99%

Comparison of mean radiant and air temperatures in mechanically-conditioned commercial buildings from over 200,000 field and laboratory measurements

Dawe

Raftery

Woolley

et al. 2020

Energy and Buildings

Self Cite

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“…This is a concern regardless of the ability of radiant systems to be able to instantaneously extract part of the radiant load [ 24 ]. Additionally, the method used to modulate temperature setpoints and the placement of slab temperature sensors could further influence system response [ 25 ]. We do not have sufficient information to assess if radiant temperature control methods affected occupant comfort.…”

Section: Resultsmentioning

confidence: 99%

Field evaluation of thermal and acoustical comfort in eight North-American buildings using embedded radiant systems

et al. 2021

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We performed a post-occupancy assessment based on 500 occupant surveys in eight buildings using embedded radiant heating and cooling systems. This study follows-up on a quantitative assessment of 60 office buildings that found radiant and all-air buildings have comparable temperature and acoustic satisfaction with a tendency for increased temperature satisfaction in radiant buildings. Our objective was to investigate reasons of comfort and discomfort in the radiant buildings, and to relate these to building characteristics and operations strategies. The primary sources of thermal discomfort are lack of control over the thermal environment (both temperature and air movement) and slow system response, both of which were seen to be alleviated with fast-response adaptive opportunities such as operable windows and personal fans. There was no optimal radiant design or operation that maximized thermal comfort, and building operators were pleased with reduced repair and maintenance associated with radiant systems compared to all-air systems. Occupants reported low satisfaction with acoustics. This was primarily due to sound privacy issues in open-plan offices which may be exacerbated by highly reflective surfaces common in radiant spaces.

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“…Radiant floors and ceilings use water as the working fluid. Whilst radiant floors are used primarily for heating [19,20], they have also been successfully applied to cool large glazed indoor areas designed to receive direct sunlight during the day [21,22]. Radiant ceilings are installed essentially to cool indoor spaces [23,24], although they have also been used for heating [25].…”

Section: Thermally Activated Building Systems (Tabs)mentioning

confidence: 99%

Building thermal storage technology: Compensating renewable energy fluctuations

Delgado

Ramos

Domínguez

et al. 2020

Journal of Energy Storage

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Full scale laboratory experiment on the cooling capacity of a radiant floor system

Cited by 35 publications

References 23 publications

Comparison of mean radiant and air temperatures in mechanically-conditioned commercial buildings from over 200,000 field and laboratory measurements

Comparison of mean radiant and air temperatures in mechanically-conditioned commercial buildings from over 200,000 field and laboratory measurements

Field evaluation of thermal and acoustical comfort in eight North-American buildings using embedded radiant systems

Building thermal storage technology: Compensating renewable energy fluctuations

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