Theoretical Evaluation of Night Sky Cooling in the Czech Republic

Šíma, Jiří; Šikula, Ondřej; Košútová, Katarína; Plášek, Josef

doi:10.1016/j.egypro.2014.02.075

Cited by 24 publications

(14 citation statements)

References 6 publications

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“…Most recent works [73,74,[100][101][102][103][104][105][106][107][108][109][110][111][112][113][114] on simulation either did not consider a cover or omit its influence. In these works the sky influence is treated in two ways: having it an effective temperature determined with empirical correlations [100][101][102][103][104][105][106][107][108][109][110][111][112][113][114] or considering the sky to have a wavelength dependant emittance and treat it analytically [73,74].…”

Section: Theoretical Approach and Numerical Simulationmentioning

confidence: 99%

“…Finally the influence of the internal fluid with the radiator temperature for some authors it is considered in different ways: function of the accumulation tank temperature or conditioned space temperature [101][102][103][104]108,109,[111][112][113], simulated with CFD [105], or not used (just calculated the maximum reachable temperature) [95,96,73,74].…”

Section: Theoretical Approach and Numerical Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Radiative cooling as low-grade energy source: A literature review

Vall

Castell

2017

Renewable and Sustainable Energy Reviews

168

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Section: Theoretical Approach and Numerical Simulationmentioning

confidence: 99%

Section: Theoretical Approach and Numerical Simulationmentioning

confidence: 99%

Radiative cooling as low-grade energy source: A literature review

Vall

Castell

2017

Renewable and Sustainable Energy Reviews

168

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“…However, the lack of suitable materials and solutions in order to reduce the heat gains limited its development. Most of the research done up-to-date has focused in the development of correlations and numerical models to determine the effective temperature of the sky and/or the emissivity of the sky [9][10][11][12], in the search of selective materials suitable for the dissipation of radiation at certain wavelengths [13][14][15][16] and in the evaluation of some specific radiative cooling devices [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Combined Radiative Cooling and Solar Thermal Collection: Experimental Proof of Concept

et al. 2020

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Climate change is becoming more important day after day. The main actor to decarbonize the economy is the building stock, especially in the energy used for Domestic Hot Water (DHW), heating and cooling. The use of renewable energy sources to cover space conditioning and DHW demands is growing every year. While solar thermal energy can cover building heating and DHW demands, there is no technology with such potential and development for space cooling. In this paper, a new concept of combining radiative cooling and solar thermal collection, the Radiative Collector and Emitter (RCE), through the idea of an adaptive cover, which uses different material properties for each functionality, is for the first time experimentally tested and proved. The RCE relies on an adaptive cover that uses different material properties for each functionality: high spectral transmittance in the solar radiation band and very low spectral transmittance in the infrared band during solar collection mode, and high spectral transmittance in the atmospheric window wavelength during radiative cooling mode. Experiments were performed during the summer period in Lleida (Dry Mediterranean Continental climate). The concept was proved, demonstrating the potential of the RCE to heat up water during daylight hours and to cool down water during the night. Daily/nightly average efficiencies up to 49% and 32% were achieved for solar collection and radiative cooling, respectively.

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“…Коммутация потоков жидкостей осуществляется при помощи клапанов (вентилей при ручном управлении) 7-16. В ночном режиме [8] холод запасается в аккумуляторе холода 2, а днем охлаждаются помещения при помощи теплообменников 4. В дневном режиме теплота запасается в аккумуляторе теплоты 3, а ночью обогреваются помещения для поддержания микроклимата в них посредством теплообменников 4.…”

Section: Introductionunclassified