Thermal performance of single span greenhouses with removable back walls

Wei, Bin; Guo, Shirong; Wang, Jian; Li, Jie; Wang, Junwei; Zhang, Jian; Qian, Chuntao; Sun, Jian

doi:10.1016/j.biosystemseng.2015.11.008

Cited by 31 publications

(10 citation statements)

References 12 publications

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“…Several studies reported that about 1/3 of the solar radiation upon the transparent front roof of the solar greenhouse reaches the north wall surface and increases its temperature, which in turn rises the indoor air temperature by up to 10 ℃. This effect provides from 35 to 82 % of the greenhouse heating requirement, depending on its location (Sethi and Sharma, 2008;Zhang et al, 2016;Wei et al, 2016). Investigations also confirmed that using a phase change material (PCM) in the north wall of solar greenhouses in the northern hemisphere was an efficient way to improve the indoor thermal environment (Yataganbaba et al, 2017;Ramakrishnan et al, 2017).…”

Section: Introductionmentioning

confidence: 74%

Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

et al. 2020

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The laboratory and full-scale prototypes of the novel solar air collector were tested;  Fuel economy achieved in tests varies from 11% to 81% depending on weather conditions;  The increased concentration ratio of about 1.4 was obtained without a sun-tracking device;  The mathematical model of the collector was validated against experimental results;  The model was used to define the rational design parameters of the full-scale prototype.

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Section: Introductionmentioning

confidence: 74%

Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

et al. 2020

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“…The heat transfer of the wall and soil surfaces was also studied to evaluate the thermal storage and insulation properties of the wall. The heat flows of surfaces inside the greenhouse were calculated by the following equations [10] :…”

Section: Figure 2 Temperature Measurement Points Throughout the Nsg Wmentioning

confidence: 99%

“…Intensive studies have been focused on the structure and functions of the back wall for years [10][11][12][13][14][15] , and the role of the back wall in the greenhouse thermal environment was investigated by exploration on different wall materials, structures and construction methods. Huang X. and Huang X., et al [16,17] studies a thermal stability layer in the back wall, shows that simply increase the thickness of the back wall cannot continuously improve its performance.…”

Section: Introduction mentioning

confidence: 99%

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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“…Therefore, the efficient utilization and storage of the received solar energy have great impact on the greenhouse microclimate and can be maximized by controlling the structure parameters of the north wall in order to provide an optimum thermal environment [5]. The north wall configurations play an essential role in heat storage and thermal insulation and directly affect the management of internal environment [6]. Generally, the north wall consists of two parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics

Liu

et al. 2020

PLoS ONE

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Chinese solar greenhouses are unique facility agriculture buildings and widely used in northeastern China, providing a favorable requirement for crop growth. The north wall configurations play an essential role in heat storage and thermal insulation and directly affect the management of the internal environment. This research is devoted to further improve the thermal performance of the greenhouse and explore the potential of the north wall. A mathematical model was designed to investigate the concave-convex wall configurations based on computational fluid dynamics. Four passive heat-storage north walls were analyzed by using the same constituent materials, including a plane wall, a vertical wall, a horizontal wall and an alveolate wall. The numerical model was validated by experimental measurements. The temperature distributions of the north walls were examined and a comparative analysis of the heat storage-release capabilities was carried out. The results showed that the heatstorage capacity of the north wall is affected by the surface structure. Moreover, the critical factor influencing the air temperature is the sum of the heat load released by the wall and the energy increment of greenhouse air. The results suggested that the alveolate wall has preferable thermal accumulation capacity. The concave-convex wall configurations have a wider range of heat transfer performance along the thickness direction, while the plane wall has a superior thermal environment. This study provides a basic theoretical reference to rationally design the internal surface structures of the north wall. OPEN ACCESSCitation: Liu X, Li H, Li Y, Yue X, Tian S, Li T (2020) Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics. PLoS ONE 15(4): e0231316. https://doi.

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Thermal performance of single span greenhouses with removable back walls

Cited by 31 publications

References 12 publications

Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

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

Effect of internal surface structure of the north wall on Chinese solar greenhouse thermal microclimate based on computational fluid dynamics

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