Experimental study on the feasibility and thermal performance of a multifunctional air conditioning system using surplus air thermal energy to heat a Chinese solar greenhouse

He, Xueying; Wang, Pingzhi; Song, Weitang; Gang, Wu; Ma, Chengwei; Li, Ming

doi:10.1016/j.renene.2022.08.100

Cited by 20 publications

(4 citation statements)

References 37 publications

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“…The energy gained and lost by the greenhouse is in energy balance [18] (Equations ( 1)-( 4)). The greenhouse energy mainly comes from solar radiation (φ solar ), equipment operation (φ equipment ), heating systems (φ heat ), and plant respiration (φ respiration ).…”

Section: Heat Load Of the Greenhousementioning

confidence: 99%

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Utilization of Surplus Air Thermal Energy by a Water Cycle System in a Chinese-Type Solar Greenhouse

Wang,

Li,

Sun

et al. 2024

Agronomy

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Solar greenhouses are commonly overheated during the day, and the remaining air heat can only be dissipated through ventilation, which is a severe energy waste problem. In order to improve the energy utilization of the greenhouse, this study proposes a water cycle system using surplus air thermal energy, which consists of an air-water heat exchanger, supply and return pipes, a submersible pump, a water tank, and an automatic control system. The proposed system stores the surplus air thermal energy in the greenhouse in the water tank. It releases it into the greenhouse using water circulation, and experimental analyses were carried out using a solar greenhouse in the Shenyang area. The effects of different air and water flow rates on the performance of the surplus air thermal energy water recycling system and the environment inside the greenhouse were analyzed by establishing a CFD model and model validation, and the average difference between the experimental data and the simulated data was 6.98%. The results show that the circulating air flow rate significantly affects the system performance and the environment inside the greenhouse. In the heat collection stage, the water circulation system with an airflow rate of 9 m/s has a minor average temperature difference in the vertical plane of the greenhouse. The water circulation system with an airflow rate of 6.0 m/s collects and releases the most significant heat. The temperature cloud between the vertical and horizontal planes is more uniform. This research provides new ideas for efficient energy use in solar greenhouses.

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Section: Heat Load Of the Greenhousementioning

confidence: 99%

“…In that case, the indoor temperature commonly exceeds that required for optimal plant growth, even in the cold season. This excess energy is then considered SATE, which can be recovered, stored, and used when heat is needed [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Surplus Air Thermal Energy by a Water Cycle System in a Chinese-Type Solar Greenhouse

Wang,

Li,

Sun

et al. 2024

Agronomy

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“…where p is the atmospheric transparency, m is the atmospheric quality, and I 0 is the normal solar radiation in the upper atmosphere, which can be calculated by Equation (2).…”

Section: Solar Radiation Outside the Greenhousementioning

confidence: 99%

“…According to the different construction methods, the existing facility greenhouses in China are divided into spring-autumn greenhouses and winter-warm greenhouses. The winter-warm greenhouse, also known as the Chinese solar greenhouse (CSG), has thermal insulation and a heat storage back wall, which can produce fruits and vegetables in winter with no or little heating in the colder regions of China at latitudes of 32-41 • N and even beyond 43 • N [1,2]. It has the advantages of good heat preservation performance and energy savings.…”

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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Study on a novel water heat accumulator below the north roof in Chinese solar greenhouse: System design

Wan,

Xia,

et al. 2023

Applied Thermal Engineering

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Experimental study on the feasibility and thermal performance of a multifunctional air conditioning system using surplus air thermal energy to heat a Chinese solar greenhouse

Cited by 20 publications

References 37 publications

Utilization of Surplus Air Thermal Energy by a Water Cycle System in a Chinese-Type Solar Greenhouse

Utilization of Surplus Air Thermal Energy by a Water Cycle System in a Chinese-Type Solar Greenhouse

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

Study on a novel water heat accumulator below the north roof in Chinese solar greenhouse: System design

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