Theoretical study of infrared transparent cover preventing condensation on indoor radiant cooling surfaces

Xing, Daoming; Li, Nianping; Cui, Haijiao; Zhou, Linxuan; Liu, Qingqing

doi:10.1016/j.energy.2020.117694

Cited by 46 publications

(9 citation statements)

References 42 publications

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“…On the component level, membrane material can be improved for better durability. The material needs to have high thermal transmissivity and low emissivity while having strong structural integrity that can better withstand daily wear and tear (Xing et al, 2020). Low-density polyethene plastics were used for the Cold Tube.…”

Section: Discussionmentioning

confidence: 99%

“…The thermal radiation transparent membrane separates the chilled surface from the ambient air while still allowing for radiative exchange between the occupants and the panels. The supply temperature can be 13°C lower than the dew point temperature (Teitelbaum, Chen, et al, 2020) or lowered to 7°C, 14.4°C and 19.3°C when the relative humidity is 65%, 80% and 90%, respectively (Xing et al, 2020) without condensation. Thus, overcoming the condensation and cooling capacity limitation when running in a naturally ventilated space.…”

Section: Membrane-assisted Radiant Cooling Panelsmentioning

confidence: 99%

“…Inside the enclosed box, the air must have low humidity to prevent condensation on the chilled surface. This can be achieved by drying the air before sealing the enclosure and maintaining the low humidity by having an airtight enclosure (refer to Morse (1963), Teitelbaum et al (2019), Xing et al, (2020) for more details on the panels). Figure 1(b) shows a full-scale prototype of the radiant panels called the Cold Tube.…”

Section: Membrane-assisted Radiant Cooling Panelsmentioning

confidence: 99%

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Exploring membrane-assisted radiant cooling for designing comfortable naturally ventilated spaces in the tropics

Chen

Teitelbaum

Meggers

et al. 2020

Building Research & Information

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This research proposes the use of membrane-assisted radiant panels to improve the thermal comfort of naturally ventilated spaces in hot and humid climates. These radiant panels are capable of conditioning naturally ventilated spaces, which is impractical with conventional mechanical cooling systems. For conventional systems, a permeable envelope will result in energy wastage from conditioned air escaping or condensation occurring on the radiant surfaces. In our system, there is no airconditioning and we avoid condensation by separating the radiant surfaces from humid air using a membrane transparent to thermal radiation. The membrane-assisted radiant panels are an unutilized technology for architects to design comfortable naturally ventilated spaces. We propose a cooling system based on the technology and discuss the architectural implications, particularly the permeability of the building envelope and requirements for mechanical spaces, of employing this system in a case study that is a naturally ventilated classroom. Our system is compared to conventional cooling systems. Although our system requires a ceiling space reconfiguration, it does not require duct works and envelope retrofits. The comparative case study shows a potential 52% reduction in cooling energy demand from initial estimation. Considering the trade-offs, our system can be a good alternative for retrofit projects.

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Section: Discussionmentioning

confidence: 99%

Section: Membrane-assisted Radiant Cooling Panelsmentioning

confidence: 99%

Section: Membrane-assisted Radiant Cooling Panelsmentioning

confidence: 99%

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Exploring membrane-assisted radiant cooling for designing comfortable naturally ventilated spaces in the tropics

Chen

Teitelbaum

Meggers

et al. 2020

Building Research & Information

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“…Very recently, quantitative evaluation of radiant cooling with infrared transparent membranes on cooling capacity was carried out by numerical modelling and reduced-scale experiments. (Xing et al, 2020) established a performance prediction model for the radiant cooling with an infrared transparent membrane to predict cooling capacity. By using the model, the effect of infrared transparent membrane properties on cooling capacity an infrared transparent cover was also investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The previous literature on infrared membranes assisted radiant cooling focused on chilled ceiling with high emissivity, e.g., 0.95 (Teitelbaum et al, 2019), 0.9 (Xing et al, 2020), 0.95 (Du et al, 2021). High emissivity chilled ceiling has great radiant potential from cooling load to cooling source, where infrared transparent membrane is advantageous to sufficient cooling capacity.…”

Section: Introductionmentioning

confidence: 99%

Improving Cooling Capacity of Condensation-Free Radiant Cooling for Low-Emissivity Chilled Ceiling via Adaptive Double-Skin Infrared Membranes

Du¹,

Wu²,

Guo³

et al. 2022

Front. Therm. Eng.

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Radiant cooling has well been acknowledged as energy efficient and thermal comfortable technology compared to conventional convective cooling. However, the radiant cooling exists two serious problems (viz., insufficient cooling capacity and high condensation risk) especially in hot and humid climate zones. By adding double-skin infrared transparent membranes (DIMs) onto radiant cooling panel, the air-contact surface can be separated from the cooling source surface, which makes it possible to use a low-temperature cooling source while maintaining air-contact surface higher than dew point temperature. The DIMs are transparent to radiant heat transfer which yields great cooling capacity while chilled ceiling has high emissivity (e.g., above 0.9). However, for metal chilled ceilings having low emissivity, radiant heat from cooling load to chilled ceiling would be reduced through DIMs, which results in insufficient cooling capacity. In this paper, a type of adaptive double-skin infrared membranes (a-DIMs) consisting a high-emissivity membrane and a high transparent membrane is proposed to improve cooling capacity of conventional metal chilled ceilings. The high-emissivity membrane serves as radiant cooling surface instead of low-emissivity chilled ceiling so as to improve radiant heat flux, while the high transparent membrane permits great radiant heat from cooling load to chilled ceiling. A combined heat transfer analysis based on semi-transparent surface radiation and natural convection were carried out to predict cooling capacity of condensation-free radiant cooling. The results indicate that the cooling capacity could be up to 101.9W/㎡ by adding a-DIMs consisting of a high-emissivity membrane of 0.96 and a high transparent membrane of 0.87, which is improved by 2 times compared to conventional metal chilled ceiling with low emissivity of 0.2. Moreover, the cooling capacity by adding a-DIMs is further improved by 25% compared to that by using both infrared transparent DIMs presented in our previous work. The results also indicate that the cooling capacity could be improved by above 2 times compared to conventional low-emissivity metal chilled ceiling by using the radiant cooling with a-DIMs for various humidity. It will be of great guidance for high-performance radiant cooling design without condensation and improved cooling capacity for low-emissivity metal chilled ceiling.

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Research on the Dynamic Simulation Method of Air-Layer Integrated Ceiling Radiant Cooling Panel

Zhang,

Huang

2023

Environmental Science and Engineering

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Theoretical study of infrared transparent cover preventing condensation on indoor radiant cooling surfaces

Cited by 46 publications

References 42 publications

Exploring membrane-assisted radiant cooling for designing comfortable naturally ventilated spaces in the tropics

Exploring membrane-assisted radiant cooling for designing comfortable naturally ventilated spaces in the tropics

Improving Cooling Capacity of Condensation-Free Radiant Cooling for Low-Emissivity Chilled Ceiling via Adaptive Double-Skin Infrared Membranes

Research on the Dynamic Simulation Method of Air-Layer Integrated Ceiling Radiant Cooling Panel

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