Coupled heat and humidity control system of narrow-trough solar collector and solid desiccant in Chinese solar greenhouse: Analysis of optical / thermal characteristics and experimental study

Chen, Xinge; Liang, H.; Gang, Wu; Cao, Feng; Tao, Tao; Ji, Yaning; Ma, Qianlei; Tong, Yuxin

doi:10.1016/j.energy.2023.127198

Cited by 21 publications

(5 citation statements)

References 33 publications

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“…to ensure that the observer is convergent. According to equation (18), the estimate of the disturbance term can be obtained.…”

Section: ˆ( ) Defining the State Variablesmentioning

confidence: 99%

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Design of MFAC greenhouse temperature controller based on LESO with disturbance estimation and fuzzy controller with parameter tuning

Wang,

Li,

et al. 2024

Phys. Scr.

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Greenhouse agriculture has become an essential part of modern agriculture. The proper temperature is essential for greenhouse crops. Therefore, it is necessary to determine an appropriate greenhouse temperature automatic control strategy for greenhouse environment control. A model-free adaptive greenhouse temperature control strategy is proposed by combining a linear extended state observer and a fuzzy controller. Specifically, the linear extended state observer is introduced to estimate model approximation error generated by pseudo gradient estimation. The fuzzy controller is used to correct the system parameter online. In the absence of disturbances, compared with the typical model-free adaptive scheme, the MAE and RMSE of the proposed scheme are reduced by 57.55 % and 5.40 %, respectively. In the presence of custom disturbances, the proposed control scheme still has a faster response speed, stronger robustness, and higher control accuracy. And the proposed method can reduce the frequent action of the actuator, thus effectively reducing the energy cost.

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“…to ensure that the observer is convergent. According to equation (18), the estimate of the disturbance term can be obtained.…”

Section: ˆ( ) Defining the State Variablesmentioning

confidence: 99%

“…Xu used optimal control to make the greenhouse temperature reach the range suitable for crop growth [17]. Chen proposed a temperature control system with a dual-cycle mode of day and night, so that the greenhouse temperature can also reach the level suitable for crop growth [18]. All of the above belong to the model-based control method.…”

Section: Introductionmentioning

confidence: 99%

Design of MFAC greenhouse temperature controller based on LESO with disturbance estimation and fuzzy controller with parameter tuning

Wang,

Li,

et al. 2024

Phys. Scr.

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“…τp is the crop layer transmission rate. Vs is the volume of soil, m 3 . γs is the soil wet bulk density, kg/m 3 .…”

Section: Influence Of Shadows Caused By Insulation Blankets On Solar ...mentioning

confidence: 99%

“…It has the advantages of good heat preservation performance and energy savings. However, there are also some disadvantages, such as high construction costs, low land utilization, and serious damage to soil resources [3]. The spring-autumn greenhouse, also called the normal plastic greenhouse, is mainly used in southern China for the production of vegetables and fruits in spring and autumn.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of the Influence of Construct Parameters on the Solar Radiation Input in an Insulated Plastic Greenhouse

Tian,

Li,

Zhao

et al. 2024

Agronomy

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Insulated plastic greenhouses (IPG) were a new type of facility emerging in production in China. The mechanism of construct parameters on the indoor solar radiation deserves further study. A mathematical model that can well describe the spatial and temporal distribution of solar radiation in the greenhouse was established. Based on this model, the effects of multiple construct parameters, such as insulation blanket shading, height–span ratio, greenhouse azimuth, and geographical latitude, on the indoor solar radiation of IPG were quantitatively specified. The results showed that the spatial and temporal distribution of inside solar radiation was highly variable along the span direction of IPG. And by analyzing the simulation data, it was found that for different heights of greenhouses, the corresponding optimal span is different. Therefore, in the construction of greenhouses, the appropriate height–span ratio should be selected according to the planting demand. And by simulating the inside solar radiation under different greenhouse azimuth angles, it was found that accumulated daily solar radiation in the greenhouse reaches the optimum value when the greenhouse azimuth angle is in the range of 0–20°. This paper can provide theoretical guidance for the design and optimization of structure parameters of IPG in China.

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“…The current solutions include both cultural practices such as precise watering, adequate place spacing, and weed controlling and passive and active ventilation methods. − Passive ventilation replaces the high-humid inside air with the low-humid outside air by opening and closing the glazing manually, facing problems of time-consuming, labor-intensive, and operator-dependent . Active ways for humidity control include heat pump, , desiccants, − and heat exchangers. , Heat pumps have been reported to be effective as they condense the moisture in the air with evaporator coils. However, it costs nearly 64% of the initial capital of the greenhouse .…”

Section: Introductionmentioning

confidence: 99%

Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

Weng,

Khater,

Paley

et al. 2024

ACS Sustainable Chem. Eng.

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Global food shortage demands significant progress in crop production. Greenhouses offer a solution for higher crop production by providing a controllable environment. Excess levels of humidity, however, encourage pests and diseases, drastically reducing crop yields. Traditional humidity control methods for greenhouses are expensive and energy-intensive. In addition to this, nonbiodegradable plastic covers cause massive white pollution. To tackle these concerns, we present smart glazing and sensors for greenhouse humidity regulation through both passive and active paths. We created biodegradable humidity-sensitive films by blending poly(ethylene glycol) (PEG) with cellulose acetate (CA). PEG/CA covers can automatically open for air circulation at high humidity, successfully demonstrating repeatable greenhouse humidity regulation to as low as 60% relative humidity. PEG/CA-based humidity sensors can actively accelerate air circulation and humidity reduction with repeated cycles at an even higher efficiency. Overall, our research introduces a low-cost, all-in-one, sustainable, and environmentally conscious solution for addressing the greenhouse humidity control challenges. Approximately, this solution can potentially achieve annual energy savings of up to 56.6 GWh for the U.S. if fully applied.

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Coupled heat and humidity control system of narrow-trough solar collector and solid desiccant in Chinese solar greenhouse: Analysis of optical / thermal characteristics and experimental study

Cited by 21 publications

References 33 publications

Design of MFAC greenhouse temperature controller based on LESO with disturbance estimation and fuzzy controller with parameter tuning

Design of MFAC greenhouse temperature controller based on LESO with disturbance estimation and fuzzy controller with parameter tuning

An Analysis of the Influence of Construct Parameters on the Solar Radiation Input in an Insulated Plastic Greenhouse

Smart Glazing for Energy- and Cost-Efficient Greenhouse Humidity Regulation

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