The Thermoheliodome – “Air conditioning” without conditioning the air, using radiant cooling and indirect evaporation

Meggers, Forrest; Guo, Hu; Teitelbaum, Eric; Aschwanden, Gideon; Read, Jake; Houchois, Nicholas; Pantelic, Jovan; Calabrò, Emanuele

doi:10.1016/j.enbuild.2017.06.033

Cited by 32 publications

(8 citation statements)

References 18 publications

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“…But now, some active cooling devices dominate the market, such as air conditions, electric fans, refrigerators and so on, which can produce some by-products through consuming electrical energy, aggravating the greenhouse effects. [3][4][5][6] To achieve the goal of "carbon neutrality," lowcarbon transformation of energy structure will be accelerated. the commercial-like colored PDRC coatings with sub-ambient radiative cooling performance, self-cleaning and good weather resistance properties have been rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Liu

Kang

Jia

et al. 2022

Adv Materials Technologies

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Passive daytime radiative cooling (PDRC) material has attracted more attentions since 2014, because of its none-energy consumption and environment friendly, [7] which can reflect sunlight in 0.28-2.5 µm as much as possible and emit heat to outer space through atmosphere windows (8-13 µm). [8] Therefore, it is of great importance to develop the PDRC material, which is beneficial to achieve the goal of "carbon neutrality."Recently, some PDRC materials and structures have been reported, such as multilayer photonic structures, [9][10][11] porous polymer materials, [12][13][14][15][16] emitters on a metal substrate, [17][18][19][20][21][22] aerogels, [23,24] particles-polymer paint-like coatings, [25][26][27][28][29][30][31][32] and so on, especially, the paint-like PDRC coatings is considered as a promising passive cooling method duo to their simple preparation, low-cost, and large-scale utilization. At present, CaCO 3 , [25] BaSO 4 , [26] TiO 2 , [27,28] MgHPO 4 •1.2H 2 O, [29] Ca 0.5 Mg 10.5 (HPO 3 ) 8 (OH) 3 F 3 , [30] 4A zeolite, [31] and ZIF-8 modified ZnO [32] were usually used as pigments to prepare white PDRC coatings. Among these paint-like PDRC coatings, it is worth noting that the BaSO 4 -based PDRC coating has the optimal reflectance (R solar = 0.981) and high emissivity (ε 8-13µm = 0.93), which could be further improved, as the ideal PDRC coating is with the close-to-unity reflectivity and emissivity for the solar spectrum and atmospheric window, respectively. Therefore, developing perfect performance paintlike PDRC coatings remains a big challenge.Besides, with the growth of economy and society, life conditions are gradually improved, and the aesthetic needs are gradually increasing for human beings. However, white PDRC coating is only white or silver color, and the surface would produce dazzle under directly sunlight, which is harmful for eyes. Hence, developing the colored radiative cooling coating has a broad market application prospect because of their better visual enjoyments and weak dazzle. Although some works have reported the colored radiative cooling coating, [33,34] few works can realize the sub-ambient radiative cooling performance until now. Furthermore, in practical applications, rain and dust in the atmosphere and long-time outdoor exposure can affect the cooling performance of PDRC coatings and reduce their service life, [35,36] so endowing PDRC coatings self-cleaning and good weather resistance properties can significantly improve the service life of PDRC coatings. [37][38][39][40] However, up to now, Passive daytime radiative cooling (PDRC) is a low-carbon energy technology to early achieve the "carbon neutrality" goal. Developing the commerciallike colored PDRC coatings with sub-ambient cooling performance is still a big challenge. Herein, a colored bilayer ZrO 2 -PVDF PDRC coating with sub-ambient cooling performance, self-cleaning, and good weather resistance property is first reported. The colored bilayer coating is composed of a thick ultra-white ZrO 2 -PVDF reflective layer (R so...

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Section: Introductionmentioning

confidence: 99%

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Liu

Kang

Jia

et al. 2022

Adv Materials Technologies

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“…Cooling is crucial for a wide range of human activities, such as food preservation, [ 1 ] air conditioning, [ 1 ][ 2 ] and data processing. [ 3 ] However, the widely used compression‐based cooling systems consume a substantial amount of electricity, generate a large quantity of CO 2 , and have a net‐heating effect.…”

Section: Introductionmentioning

confidence: 99%

Scalable Aqueous Processing‐Based Passive Daytime Radiative Cooling Coatings

Huang

Chen

Luo

et al. 2021

Adv Funct Materials

107

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Passive daytime radiative cooling (PDRC) can realize electricity‐free cooling by reflecting sunlight and emitting heat to the cold space. Current PDRC designs often involve costly vacuum processing or a large quantity of harmful organic solvents. Aqueous and paint‐like processing is cost‐effective and environmentally benign, thereby highly attractive for green manufacturing of PDRC coatings. However, common polymers explored in PDRC are difficult to disperse in water, let alone forming porous structures for efficient cooling. Here, a simple “bottom‐up” ball milling approach to create uniform microassembly of poly(vinylidene fluoride‐co‐hexafluoropropene) nanoparticles is reported. The micro‐ and nanopores among secondary particles and primary particles substantially enhance light scattering and results in excellent PDRC performance. A high solar reflectance of 0.94 and high emittance of 0.97 are achieved, making the coating 3.3 and 1.7 °C cooler than commercial white paints and the ambient temperature, under a high solar flux of ≈1100 W m−2. More importantly, the volatile organic compound content in the aqueous paint is only 71 g L−1. This satisfies the general regulatory requirements, which are critical to sustainability and practical applications.

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“…Yu et al [27,28] proposed a novel system combining natural ventilation with diffuse ceiling inlet and thermally activated building systems (TABS) and investigated its cooling performance experimentally in Denmark, which has a relatively cold climate even in summer, and hence the condensation issue on the TABS was not considered. Meggers et al [29] experimentally analyzed the thermal comfort of an open air pavilion using radiant cooling and indirect evaporation under the temperate climate of Princeton. Vangtook and Chirarattananon [30] employed water cooled by a cooling tower for radiant cooling and found that it was sufficient to achieve thermal comfort in night-time application, while the ventilation air precooled by chilled water at 10 • C was required to treat the latent load in day-time application.…”

Section: Introductionmentioning

confidence: 99%

Thermal Comfort and Energy Analysis of a Hybrid Cooling System by Coupling Natural Ventilation with Radiant and Indirect Evaporative Cooling

Shakya

Zhou

et al. 2021

Energies

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A hybrid cooling system which combines natural ventilation with a radiant cooling system for a hot and humid climate was studied. Indirect evaporative cooling was used to produce chilled water at temperatures slightly higher than the dew point. With this hybrid system, the condensation issue on the panel surface of a chilled ceiling was overcome. A computational fluid dynamics (CFD) model was employed to determine the cooling load and the parameters required for thermal comfort analysis for this hybrid system in an office-sized, well-insulated test room. Upon closer investigation, it was found that the thermal comfort by the hybrid system was acceptable only in limited outdoor conditions. Therefore, the hybrid system with a secondary fresh air supply system was suggested. Furthermore, the energy consumptions of conventional all-air, radiant cooling, and hybrid systems including the secondary air supply system were compared under similar thermal comfort conditions. The predicted results indicated that the hybrid system saves up to 77% and 61% of primary energy when compared with all-air and radiant cooling systems, respectively, while maintaining similar thermal comfort.

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The Thermoheliodome – “Air conditioning” without conditioning the air, using radiant cooling and indirect evaporation

Cited by 32 publications

References 18 publications

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Scalable Aqueous Processing‐Based Passive Daytime Radiative Cooling Coatings

Thermal Comfort and Energy Analysis of a Hybrid Cooling System by Coupling Natural Ventilation with Radiant and Indirect Evaporative Cooling

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The Thermoheliodome – “Air conditioning” without conditioning the air, using radiant cooling and indirect evaporation

Cited by 32 publications

References 18 publications

Commercial‐Like Self‐Cleaning Colored ZrO2‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Commercial‐Like Self‐Cleaning Colored ZrO2‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Scalable Aqueous Processing‐Based Passive Daytime Radiative Cooling Coatings

Thermal Comfort and Energy Analysis of a Hybrid Cooling System by Coupling Natural Ventilation with Radiant and Indirect Evaporative Cooling

Contact Info

Product

Resources

About

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling

Commercial‐Like Self‐Cleaning Colored ZrO₂‐Based Bilayer Coating for Remarkable Daytime Sub‐Ambient Radiative Cooling