Entries by A. J. Puckett

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Solar Powered Evaporative Cooled Storage Structure For Storage of Fruits and Vegetables

This report describes a food storage structure that includes a solar-powered, evaporative cooler. The storage structure was designed and developed to increase the shelf life of fresh fruits and vegetables. The report shows that this is made possible by solar-powered exhaust fans and a cooling pump that provides water to the pads. These applications may be useful when agrisolar operations are located in dry or desert conditions.

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Design and Test of an Affordable Cold Room Powered by Solar for Improving Storage Quality and Reducing Wastage of Horticulture Produce

This report describes a cold-storage structure that employs a solar-powered cooler to reduce food spoilage after harvest. The results of this project show that through low-cost cold rooms powered by solar energy, farmers can extend shelf life of fruits and vegetables which ultimately increases revenue for smallholder farms and their bargaining power in the marketplace.

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A Novel Solar Powered Milk Cooling Refrigeration Unit with Cold Thermal Energy Storage for Rural Application

This article discusses the effectiveness of solar PV in a twin-circuit DC milk chiller in rural India. The study measured average amounts of ice formed per day for a period of eighteen days out of each season as well as the climactic conditions that variations of the refrigerants operated under. The system ultimately operates with less power during conditions that include automated temperature-based shut offs based on milk temperature. This allows energy to be utilized elsewhere when shut-off systems are engaged.

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Techno-Economic Study of Agrovoltaic Focusing on Orchard Crops

This paper presents a novel 3D agrovoltaic modelling tool developed in python, which enables technical and economical evaluation of potential agrovoltaic designs. The study shows that agrivoltaic installations can be utilized to further decarbonize the agriculture sector while also providing new market opportunities for PV installers and developers.

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SPE Best Practices Guidelines for Agrisolar

This best practices report includes many orchardvoltaic case studies in Europe, including: Albers raspberry farm in the Netherlands, strawberry greenhouses in France, citrus fruit and aromatic herbs grown in PV greenhouses in France as well as land regeneration and an animal husbandry agrisolar project in Hauet-Garonne, France. These projects presented in this report can be useful in the development of similar agrisolar projects in the future.

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Water Status, Irrigation Requirements and Fruit Growth of Apple Trees Grown Under Photovoltaic Panels

This article describes a planned three-year study (2019-2022) to understand the effect of shading below solar panels in apple production. This study includes tree water status, irrigation requirements, and fruit growth. The first-year results show that the presence of solar panels on top of apple trees improved their water status with less water applied in the period prior to harvest without any negative effects in fruit growth rates than with trees that had no solar panels.

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The Effect of Gap Spacing Between Solar Panel Clusters on Crop Biomass Yields, Nutrients, and the Microenvironment in a Dual-Use Agrivoltaic System

This thesis examines the crop outputs for Swiss chard, kale, pepper, and broccoli in an agrisolar system with different gap spacings between solar panel clusters. It concludes that the biomass crop yields of agrisolar plots are restricted significantly for Swiss chard, kale, or pepper compared against the full-sun control plot yields but not for broccoli stem and leaf yields.

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Solar Sharing for Both Food and Clean Energy Production: Performance of Agrivoltaic Systems for Corn, A Typical Shade-Intolerant Crop

This article concerns research conducted at a 100-m2 experimental farm with three sub-configurations: no modules (control), low module density, and high module density. In each configuration, 9 stalks/m2 were planted 0.5 m apart. The biomass of corn stover grown in the low-density configuration was larger than that of the control configuration by 4.9%. Also, the corn yield per square meter of the low-density configuration was larger than that of the control by 5.6%. 

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Solar Photovoltaic Architecture and Agronomic Management in Agrivoltaic System: A Review

This article reviews factors that influence solar PV and agronomic management in agrisolar systems. The authors conclude that several adjustments for crop selection and management are needed due to light limitation, microclimate condition beneath the solar structure, and solar structure constraints. The authors also conclude that a systematic irrigation system is required to prevent damage to the solar panel structure.