Potential and challenges of a user-centric radiant cooling approach

Teufl, Helene; Schuß, Matthias; Mahdavi, Ardeshir

doi:10.1016/j.enbuild.2021.111104

Cited by 22 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Predicting thermal comfort by applying virtual human manikins in the CFD simulation has been reported by numerous studies [13]. According to our observation, there are no relevant standards in CFD simulations for the sizes, shapes, and postures of human model, and their application mostly depends on the purposes of the research works [26][27][28][29]. Because of the excessive simulation time, the majority of CFD studies have applied simple (e.g., rectangular) shapes.…”

Section: Introductionmentioning

confidence: 86%

“…The target panel surface temperature was 10 °C. For these indoor air and panel surface temperatures, the cooling power of the radiant element was estimated to be roughly 100 W per square meter panel area [27]. The air flow speed was measured and simulated at several heights (10, 35, 60, 85, and 110 cm above the floor) and distances (1, 1.5, 2, 3, 4, 5, 10, 15, 20, 30, 40, and 50 cm from the radiant panel) (see Figure 2) [31].…”

Section: Approachmentioning

confidence: 99%

“…Within the framework of a recently completed research study, the potential of vertical radiant panels in the proximity of users was investigated and related technological requirements regarding envelope tightness and ventilation systems as well as water vapor condensation risk were evaluated [27]. As mentioned before, the personal radiant cooling panels are designed so as to manage potential surface condensation of water vapor via specific elements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measurement and CFD analysis of a local radiant cooling solution

Khosravi

Teufl

Mahdavi

2022

APP

View full text Add to dashboard Cite

This paper entails an empirical and computational assessment of the air flow field in the close proximity of a vertically positioned radiant cooling panel. This radiant cooling solution differs from the conventional large-area radiant cooling systems (e.g., ceiling panels). It involves rather small-sized vertical panels positioned close to occupants. Moreover, the panels are designed so as to manage potential surface condensation of water vapor via integrated drainage elements. Hence, the panels can be operated with relatively low surface temperatures. The low panel surface temperature and its proximity to the occupants are intended to compensate for the potential lower cooling power due to the relatively small panel size. In this paper, we specifically explore the air flow field close to the local radiant cooling panel via laboratory measurements and CFD (Computational Fluid Dynamics). Thus, possible issues regarding discomfort due to draft and turbulence risk close to the radiant panel can be examined. To this end, a prototypical local radiant cooling panel was installed in a mock-up office room of a laboratory. During the experiments, the air flow speed was measured and simulated at several heights (between 10 and 110 cm from the floor) and distances (ranging from 1 to 50 cm from the radiant panel). The results allow for the evaluation of the draft discomfort risk as well as the reliability of CFD in reproduction of the measurement results. A further step involved the numeric analysis of the effect of the human model on the air flow patter.

show abstract

Section: Introductionmentioning

confidence: 86%

Section: Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement and CFD analysis of a local radiant cooling solution

Khosravi

Teufl

Mahdavi

2022

APP

View full text Add to dashboard Cite

show abstract

“…Even the use of personalised radiant conditioning systems alone was able to reach the thermal comfort criteria reducing energy consumption by 69%. Teufl et al (2021) showed how personalised radiant cooling could provide acceptable comfort levels at an ambient air temperature of 28°C. They also highlighted that air movement was key in influencing the subject's preference for radiant cooling (Aryal et al 2022;Teufl et al 2021).…”

Section: Recognise Individual Cooling Needs Through Occupant-centric ...mentioning

confidence: 99%

“…Teufl et al (2021) showed how personalised radiant cooling could provide acceptable comfort levels at an ambient air temperature of 28°C. They also highlighted that air movement was key in influencing the subject's preference for radiant cooling (Aryal et al 2022;Teufl et al 2021). Pasut et al (2015) demonstrated how the use of heated/cooled chairs provided comfortable conditions for 92% of the subjects in a range of temperatures from 18 to 29°C.…”

Section: Recognise Individual Cooling Needs Through Occupant-centric ...mentioning

confidence: 99%

Overcoming the incumbency and barriers to sustainable cooling

Lizana

Miranda

Gross³

et al. 2022

Buildings and Cities

View full text Add to dashboard Cite

This article examines cooling in the built environment, an area of rapidly rising energy demand and greenhouse gas emissions. Specifically, the status quo of cooling is assessed and proposals are made for how to advance towards sustainable cooling through five levers of change: social interactions, technology innovations, business models, governance and infrastructure design. Achieving sustainable cooling requires navigating the opportunities and barriers presented by the incumbent technology that currently dominates the way in which cooling is provided-the vapour-compression refrigerant technology (or airconditioners). Air-conditioners remain the go-to solution for growing cooling demand, with other alternatives often overlooked. This incumbent technology has contributed to five barriers hindering the transition to sustainable cooling: (1) building policies based exclusively on energy efficiency; (2) a focus on temperature rather than other thermal comfort variables; (3) building-centric design of cooling systems instead of occupantcentric design; (4) businesses guided by product-only sales; and (5) lack of innovation beyond the standard operational phase of the incumbent technology. Opportunities and priority actions are identified for policymakers, cooling professionals, technicians and citizens to promote a transition towards sustainable cooling.

show abstract