Dual-Roof Solar Greenhouse—A Novel Design for Improving the Heat Preserving Capacity in Northern China

Chai, Lilong; Wang, Baoju; Liu, Mingchi; Wu, Zhanhui; Xu, Yong

doi:10.4236/nr.2014.512059

Cited by 3 publications

(5 citation statements)

References 6 publications

(5 reference statements)

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“…They may require very powerful processors and broad communication [8]. Lilong Chai presented dual-roof solar greenhouse system that improves heat prevention capacity of greenhouse system [9].…”

Section: Literature Surveymentioning

confidence: 99%

Study on Greenhouse and Monitoring WSN System Incorporating Iot

2022

IRJMETS

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In India is a country where farming plays a vital role in economy while over 40% of total population is involved in directly or indirectly into agriculture industries thus this review article includes a brief overview of greenhouse technologies includes structural details in contrast with automation technologies. Wireless sensor network (WSN) and internet of things (IoT) together can make the controlled climatic agriculture globally controllable and accessible. This article also contains the hardware approach towards greenhouse controlling system.

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Section: Literature Surveymentioning

confidence: 99%

Study on Greenhouse and Monitoring WSN System Incorporating Iot

2022

IRJMETS

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“…where, Q refers to the heat flux over the entire area during the chosen period, J; C p refers to specific heat capacity, J• kg -1 •°C -1 ; ρ refers to density, kg• m -3 ; V refers to volume, m 3 ; and Δt refers to temperature variation, °C.…”

Section: Figure 2 Temperature Measurement Points Throughout the Nsg Wall Shown In A Front (A) And Cross (B) Viewmentioning

confidence: 99%

“…Compared with the OSG, the temperature during the night in the NSG was 4°C higher. Equation (3) indicates that the indoor air needed to absorb 161.5 MJ of heat energy to raise the temperature by 4°C. During the same period, the total heat released by the wall and soil was 1009.1 MJ, which means that only 16% of the heat released from the wall and soil contributed to indoor heating, and 84% was lost in various forms.…”

Section: Heat Transfer Of the Wall Surface At Different Heightsmentioning

confidence: 99%

“…There were also many sub-systems that tried to improve the thermal environment of solar greenhouses, e.g. heat collection and release system [1] , heat pump system [2] , and dual-roof design [3] . Most solar greenhouses can provide a suitable micro-climate for growing crops and plants, able to produce most kinds of vegetables over-winter, especially fruit vegetables [4,5] .…”

Section: Introduction mentioning

confidence: 99%

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Comparison of thermal and light performance in two typical Chinese solar greenhouses in Beijing

Xu¹,

Chen²,

Li³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Solar greenhouses have been used for producing vegetables in northern China during early spring, late autumn or over-winter. To improve the thermal performance of solar greenhouses, a traditional type and a retrofitted design were comparatively evaluated. In the retrofitted design, three adjustments were incorporated: the material and structure of the walls, south-facing roof angle, and structure of the north-facing back-roof. The results indicated that the thermal and light performance of the retrofitted greenhouse was much better than that of the traditional greenhouse. Specifically, the daily mean temperature, minimum air temperature, and soil temperature inside the greenhouses after retrofit ting were increased by 1.3, 2.4, and 1.9°C, respectively, meanwhile, the daily total solar radiation and PAR were increased by 28.2% and 9.2%, respectively. The wall temperature and its daily variation range were reduced with increasing depth and height. The characteristic analysis of heat storage and release indicated that higher locations have longer heat storage, and shorter heat release time in vertical direction, as well as a lower ratio of heat release to storage. In horizontal direction, the western wall has the shortest heat storage time but the highest heat release flux density. Altogether, the heat storage time of the wall is 1.5 h less than that of the soil. The heat storage flux density of the wall is 1.5 times of that of the soil, but the heat release flux is only 61% of the soil's value. The total wall heat storage is half of that of the soil in the greenhouse; the total wall heat release amount is only a quarter of that of the soil. Therefore, the thermal environment of solar greenhouses can be further improved by improving the thermal insulation properties of the wall.

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“…In this study, we assumed that all the G1-type Chinese solar greenhouses would need additional heating in calculating the GHG emissions. However, novel structures and materials were applied for building Chinese solar greenhouses in Beijing in recent years [36], which improved the heat-preserving capacity of the greenhouse so that heating was not required in winter time. Therefore, the GHG emissions from heating Chinese solar greenhouse could be lower than the amount calculated in this study.…”

Section: Uncertainty Evaluationmentioning

confidence: 99%

Mitigating Greenhouse Gas Emissions from Winter Production of Agricultural Greenhouses

Chai¹,

Ma²,

Wang³

et al. 2016

Greenhouse Gases

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Consuming conventional fossil fuel, such as coal, natural gas, and oil, to heat agricultural greenhouses has contributed to the climate change and air pollutions regionally and globally, so the clean energy sources have been increasingly applied to replace fossil energies in heating agricultural greenhouses, especially in urban area.To assess the environment performance e.g., greenhouse gas GHG emissions of the ground source heat pump system GSHPs for heating agricultural greenhouses in urban area, a GSHPs using the shallow geothermal energy SGE in groundwater was applied to heat a Chinese solar greenhouse G and a multispan greenhouse G in "eijing latitude ° ′ N , the capital city of China. Emission rates of the GSHPs for heating the G and G were quantified to be .. g CO eq. m − day − . The total GHG emissions from heating greenhouses in "eijing with the GSHPs were quantified as . . Gt CO eq. year − based on the electricity from the coal-fired power plant CFPP and the gas-fired power plant GFPP . "mong different stages of the SGE flow, the SGE promotion contributed most GHG emissions % in total due to the higher consumption of electricity in compressors. The total GHG emissions from greenhouses heating with the coal-fired heating system CFHs and gas-fired heating system GFHs were quantified as . . Gt CO eq. year − in "eijing. Heating the G and G with the GSHPs powered by the electricity from the CFPP, the equivalent CO emissions were % and % lower than directly burning coal with the CFHs but were % and % higher than the GFHs that burn natural gas. However, when using the GFPP-generated electricity to run the GSHPs, the equivalent CO emissions would be % and % lower than the CFHs and the GFHs, respectively.

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Dual-Roof Solar Greenhouse—A Novel Design for Improving the Heat Preserving Capacity in Northern China

Cited by 3 publications

References 6 publications

Study on Greenhouse and Monitoring WSN System Incorporating Iot

Study on Greenhouse and Monitoring WSN System Incorporating Iot

Comparison of thermal and light performance in two typical Chinese solar greenhouses in Beijing

Mitigating Greenhouse Gas Emissions from Winter Production of Agricultural Greenhouses

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