Energy saving and economic analysis of a new hybrid radiative cooling system for single-family houses in the USA

Zhang, Kai; Zhao, Dongliang; Yin, Xiaobo; Yang, Ronggui; Tan, Guofu

doi:10.1016/j.apenergy.2018.04.115

Cited by 123 publications

(49 citation statements)

References 43 publications

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“…[2][3][4][5][6] Very recently, owing to the progress in nanophotonics and metamaterials, daytime radiative cooling to subambient temperatures have been demonstrated, which has revived interest and attracted further research. [7][8][9][10][11][12][13][14][15][16][17][18] However, due to the intrinsic low energy density of radiative cooling (generally with a cooling flux in the order of 100 W/m 2 at ambient temperature), most of the recent works have been restricted to the demonstration of its potential by showing a temperature drop from the ambient temperature under the sun, but only for a small thermal mass. By eliminating the thermal loss through a delicate vacuum with an extremely small thermal mass, an average temperature drop of as much as 37 C has been achieved.…”

Section: Introductionmentioning

confidence: 99%

Subambient Cooling of Water: Toward Real-World Applications of Daytime Radiative Cooling

Zhao

Aili

Zhai

et al. 2019

Joule

Self Cite

394

195

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Radiative sky cooling of large thermal mass water to 10.6 C below the ambient temperature is demonstrated around noon under direct sunlight by using polymerbased low-cost radiative cooling metamaterial. Subambient cool-water production at various constant temperatures is experimentally demonstrated. The parasitic effects of different weather conditions (local wind speed, precipitable water, and cloud cover) on the performance of sky radiative cooling have been investigated, which is critical for developing operation strategies for real-world applications.

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Section: Introductionmentioning

confidence: 99%

Subambient Cooling of Water: Toward Real-World Applications of Daytime Radiative Cooling

Zhao

Aili

Zhai

et al. 2019

Joule

Self Cite

394

195

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“…where C R is the cost of the building employing the TRM, C A is the cost of the air conditioning system after employing the TRM, and the split air conditioning [26] was 404.5 $/kW. C S is the cost of air conditioning alone, E S1 and E S2 are the summer and winter electricity consumption of the split air conditioning, respectively, and E A1 and E A2 are the summer and winter electricity consumption by employing the TRM and the split air conditioning respectively, and P E is the electricity price, which is 0.12 $/kWh in this paper [25]. In addition, the maximum acceptable incremental cost AIC max proposed by Fernandez et al [27] is employed to evaluate the economy of the TRM, as shown in equation (13).…”

Section: Economic Analysis Modelmentioning

confidence: 88%

“…The energy saving of the building employing the TRM with different areas was subsequently discussed, but note that it was meaningless to optimize the TRM area without considering the cost. With 8 years as an acceptable payback period [25], the optimum area of the TRM was determined when both the TRM and the split air conditioning jointly provided cooling/heating capacity for the indoor. The optimal area of the TRM in Tianjin was 62 m 2 with an energy saving of 24% in summer, while that in Xi'an was 52 m 2 with an energy saving of 19.5% in summer.…”

Section: Discussionmentioning

confidence: 99%

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Research on the performance of radiative cooling and solar heating coupling module to direct control indoor temperature

Liu

Zhou

Zhang

et al. 2020

Energy Conversion and Management

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The energy crisis and environmental pollution pose great challenges to human development. Traditional vaporcompression cooling consumes abundant energy and leads to a series of environmental problems. Radiative cooling without energy consumption and environmental pollution holds great promise as the next generation cooling technology, applied in buildings mostly in indirect way. In this work, a temperature-regulating module was introduced for direct summer cooling and winter heating. Firstly, the summer experiments were conduct to investigate the radiative cooling performance of the module. And the results indicated that the maximum indoor temperature reached only 27.5°C with the ambient temperature of 34°C in low latitude areas and the air conditioning system was on for only about a quarter of the day. Subsequently, the winter experiments were performed to explore the performance of the module in cooling and heating modes. The results indicated that indoor temperature can reach 25°C in the daytime without additional heat supply and about a quarter of the day didn't require heating in winter. Additionally, the transient model of the module and the building revealed that the electricity saving of 42.4% (963.5 kWh) can be achieved in cooling season with the module, and that was 63.7% (1449.1 kWh) when coupling with energy storage system. Lastly, further discussion about the challenges and feasible solutions for radiative cooling to directly combine with the buildings were provided to advance the application of radiative cooling. Furthermore, with an acceptable payback period of 8 years, the maximum acceptable incremental cost reached 26.2 $/m 2. The work opens up a new avenue for the application mode of the daytime radiative cooling technology.

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“…32,33 However, the climate zones, interior heat gains, and envelope thermal insulations significantly impact the cooling performance of buildings with a cool roof. 34 Although a cool roof can reduce building energy consumption, the energy-savings potential is limited because: 15 (1) a cool roof only benefits the top floor of a building and (2) the cooling power of existing diurnal radiative cooling is relatively low. These characteristics limit the application of a cool roof, especially for high-rise buildings.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the impact of a novel cool roof on cooling performance for a low-rise prefabricated building in China

Zhang

Chen

et al. 2020

Building Services Engineering Research and Technology

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The recently proposed scalable-manufactured randomized glass-polymer hybrid metamaterial (i.e. metamaterial film) exhibits good energy-saving potential for building applications. The most convenient way to employ this metamaterial film-based radiative cooling is to integrate it with buildings as cool roofs. However, metamaterial film-based radiative cooling is more suitable for buildings with higher roof area to floor area ratios, as this accounts for its relative lower cooling power of 110 W/m2 on a daily average. The prefabricated buildings in China are commonly less than two floors, which are preferable for the application of this metamaterial film-based radiative cooling. To clearly reveal the cooling performance of the metamaterial film-based cool roof (MFCR), a single-floor prefabricated building is modelled in this study, and the energy-saving potential and economic feasibility of the application of the MFCR on the prefabricated building are discussed in detail. When comparing the model in this study with buildings that have the more commonly used shingle roofs or typical white roofs, the annual cooling electricity consumption is reduced by 28.9%–43.0% and 7.8%–12.9%, respectively, for buildings with MFCRs located in five cities in China, each in a different climate zone. Furthermore, the simple payback period for the buildings with MFCRs located in all five climate zones is less than three years compared to the buildings with shingle roofs. Practical application: A recently proposed metamaterial film exhibits good energy-saving potential for building applications. This paper explores the application of this metamaterial film as a cool roof on a low-rise prefabricated building. The analysis of the cooling performance and economic value of this low-rise prefabricated building located in all five climate zones in China provides guiding significance for the application of MFCR.

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Energy saving and economic analysis of a new hybrid radiative cooling system for single-family houses in the USA

Cited by 123 publications

References 43 publications

Subambient Cooling of Water: Toward Real-World Applications of Daytime Radiative Cooling

Subambient Cooling of Water: Toward Real-World Applications of Daytime Radiative Cooling

Research on the performance of radiative cooling and solar heating coupling module to direct control indoor temperature

Analysis of the impact of a novel cool roof on cooling performance for a low-rise prefabricated building in China

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