The Effect of Radiative Cooling on Reducing the Temperature of Greenhouses

Liu, Chia-Hsin; Ay, Chyung; Kan, Jo-Chuan; Lee, Maw-Tien

doi:10.3390/ma11071166

Cited by 16 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1,2] UV radiation affects film degradation and pollinators' behavior, and NIR radiation is a direct source of heat, which penetrates the greenhouses, excessively increasing the temperature, which is harmful to people who work inside and to the crops. [3] Thus, organic and inorganic chemicals have been added to polymeric materials to reflect NIR radiation, reducing heat inside the greenhouse, and absorbing UV radiation protecting the film from degradation. [4][5][6] However, organic substances have lower weather resistance and thermal stability than inorganic products.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] However, organic substances have lower weather resistance and thermal stability than inorganic products. [3] Among the inorganic substances, studies have shown that titanium dioxide nanoparticles have a high UV radiation absorption potential and boron nitride (BN) nanoplatelets have a high potential to reflect NIR. [5,6] One of the interesting properties of TiO 2 , when added to polymeric materials, is its ability to absorb UV radiation (λ < 400 nm), since polymer exposure to that radiation causes degradation and/or aging that affects their appearance (coloration) and their chemical and physical properties, for example.…”

Section: Introductionmentioning

confidence: 99%

“…[ 4‐6 ] However, organic substances have lower weather resistance and thermal stability than inorganic products. [ 3 ]…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multifunctional bionanocomposites with ultraviolet blocking, infrared reflection and thermal conductivity

Decol

Pachekoski

Becker

2020

Polymer Engineering & Sci

View full text Add to dashboard Cite

The objective of this paper is investigating the effect of different localizations of titanium dioxide (TiO 2) and hexagonal boron nitride (hBN) nanoparticles in the poly(lactic acid) (PLA)/poly(ε-caprolactone) (PCL) blends on the ultraviolet (UV) blocking, infrared reflection (NIR), and thermal conductivity of the nanocomposites for the fabrication of bionanocomposites with high performance. Transmission electron microscopy images demonstrated that the different mixing sequences induced different nanoparticle localization in the immiscible PCL/PLA blend. These different localizations yielded differences in the properties of the hybrid quaternary nanocomposite. When the nanoparticles had different localizations, TiO 2 at the interface and hBN in the PCL phase, the thermal conductivity was 0.86 Wm −1 K −1 , 100% of UV radiation (λ = 300 nm) was blocked and 74% of NIR radiation was reflected. This nanocomposite has a strong potential for application as a multifunctional biodegradable film for agriculture, capable of absorbing UV radiation, reflecting NIR radiation, and conducting thermal energy.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multifunctional bionanocomposites with ultraviolet blocking, infrared reflection and thermal conductivity

Decol

Pachekoski

Becker

2020

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…However, this coated cover could repeatedly wash out by rain [9]. Recently, the greenhouse cover using silica as an addition to serve as a basis for radiation cooling was reported [10]. It was found that, under 35°C ambient conditions, the inside temperature of the simulated greenhouse with the 1% SiO 2 double layer films was 3 to 5°C less than that of the greenhouse with the commercial agricultural polyethylene (PE) film.…”

Section: Introductionmentioning

confidence: 99%

Development of Multifunctional Film for Greenhouse Applications in Tropical Regions

Petchsuk

Srinun

Buchatip

et al. 2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Single-purpose greenhouse films such as UV-blocking, NIR-blocking, or ultrathermic films are commonly developed in various climate regions. However, multifunctional films of combined functions are rarely explored, especially in the tropical regions. In this research, a multifunctional film having high UV filtration, high NIR reflection, and good light diffusion was developed for a greenhouse cover application in tropical regions. Effects of type, quantity, and particle size of additives on optical properties (280–2500 nm) and mechanical properties of 3-layer laminated films comprising 90% LLDPE/10% EVA polymer matrix and additives were studied. Results show that properties of those films are adjustable by varying types, particle size, and content of additives. The UV transmission of the film was ranged from 13.7 to 32.7 %T, NIR reflection from 12.1 to 19.8 %R, and %haze diffusion from 39.5 to 72.3 where photosynthetically active radiation (PAR) transmission was in the range of 62.6–78.9 %T. Those films exhibit tensile strength of 18–24 MPa, modulus of elasticity of 200–280 MPa, and elongation at break of 610–810%. A field test of the newly developed films as a cover for a greenhouse of 6 m wide ×24 m long ×4.3 m high with double roof design showed a better quality of plant growth in terms of weight, height, and bush width compared to a 7% UV absorber commercial film.

show abstract

“…The greenhouse covering needs sunlight penetrating inside to keep the plants growing; therefore, it requires high transmittance in the visible radiation and high emissivity over the infrared atmosphere window. From past research, radiative cooling can be achieved by using some nonmetal oxide particle [7,10,[12][13][14][15][16][17]. Unlike the devices mentioned above, the covering of a greenhouse needs neither high reflection nor a complicated device so we only added nonmetal oxide particles as the base of films for radiation cooling rather than using complex composition.…”

Section: Introductionmentioning

confidence: 99%

The Application of Passive Radiative Cooling in Greenhouses

Liu

Tsai

et al. 2019

Sustainability

Self Cite

View full text Add to dashboard Cite

At present, greenhouses are used to grow a variety of crops around the world. However, with the change of climate, the increasingly harsh weather makes it more and more disadvantageous for people to work inside, and plants are difficult to grow. Previous research has illustrated that radiative cooling can be realized by using certain nonmetal oxide particles created for emission in an infrared atmospheric transparency window, which is an environmentally friendly cooling method due to reducing energy consumption. Polyethylene (PE)-based formulations with a UV stabilizer and nonmetal oxide particles (NOP) were first granulated and then formed a monolayer film by co-injection molding. The experimental results show that due to passive radiative cooling, under the environmental conditions of 35 °C, and only considering the natural convection heat transfer, the net cooling power of the greenhouse film developed in this study is 28 W·m−2 higher than that of the conventional PE film. The temperature inside the simulated greenhouse cladded with the new greenhouse covering was on average 2.2 °C less than that of the greenhouse with the conventional PE film.

show abstract

The Effect of Radiative Cooling on Reducing the Temperature of Greenhouses

Cited by 16 publications

References 34 publications

Multifunctional bionanocomposites with ultraviolet blocking, infrared reflection and thermal conductivity

Multifunctional bionanocomposites with ultraviolet blocking, infrared reflection and thermal conductivity

Development of Multifunctional Film for Greenhouse Applications in Tropical Regions

The Application of Passive Radiative Cooling in Greenhouses

Contact Info

Product

Resources

About