Papers by Timothy D . Akpenpuun, PhD
Korean journal of agricultural science, Sep 1, 2023
The large amount of energy required for successful crop production is the main challenge in green... more The large amount of energy required for successful crop production is the main challenge in greenhouse cropping systems. As a response to this challenge a comprehensive evaluation of greenhouse energy consumption was carried out in two structurally similar single-span greenhouses with different thermal curtain positions, with particular attention to energy productivity, specific energy, net energy, and energy ratio. The greenhouses are used for strawberry production. In the R-greenhouse (RGH), the thermal curtain hanged directly at the roof ridge, whereas in the Q-greenhouse (QGH), the thermal curtain was placed 5° from an imaginary vertical axis, from the middle of the roof ridge downwards to the north side of the greenhouse roof. The relevant data were recorded using standard methods. The results indicated that the energy expended in the RGH and QGH systems was 2,186.48 and 2,189.26 MJ/m 2 , respectively. Electricity and nitrogen fertilizer contributed the highest energy input in both greenhouses and in all seasons. The output energy was 3.12 and 3.82 MJ/m 2 , respectively, in RGH and QGH in season I and 4.40 and 4.87 MJ/m 2 in season II. In terms of energy expended, there was no significant difference between the two greenhouses, nor between the two seasons. These results indicate that greenhouses of the size used in this investigation are not viable in terms of energy productivity, energy-use efficiency, and subsequent economic performance. However, further studies should be conducted to scaleup the information obtained from this investigation.
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Journal of applied science and environmental management, Feb 25, 2024
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Nigerian Journal of Pure and Applied Sciences
Greenhouse energy management is one of the most significant factors of consideration in greenhous... more Greenhouse energy management is one of the most significant factors of consideration in greenhouse agriculture. Besides implementing energy supply systems to the facility, energy-saving measures must also be taken into consideration. To address the issue of energy demand by greenhouses in a tropical environment, three greenhouse models were developed to simulate their thermal environments utilizing the Transient Systems Simulation Program (TRNSYS 18) as a building energy simulation (BES) platform. The proposed models were used to examine the impact of greenhouse design parameters; roof shape, orientation, covering (polyethene), and ventilation, on their temperature, relative humidity (RH), vapour pressure deficit (VPD), and cooling load. It was found that the most suitable roof design and orientation was the split-gable roof design with the ventilation switched on and 0o (E-W) orientation that had the lowest mean temperature of 24.12 oC and the least cooling demand of 454.59W. While...
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Journal of Agricultural Engineering and Technology (JAET), 2023
The microclimate within indoor production systems is intricately linked to the macroclimate of th... more The microclimate within indoor production systems is intricately linked to the macroclimate of their surrounding environment, resulting in dynamic fluctuations over time. This study investigated the variations in thermal conditions within two adjacent single-span tunnel greenhouses, each utilizing distinct airflow systems: one equipped with circular airflow fans (HUMITEM-GH) and the other with horizontal airflow fans (Conv-GH). Temperature (Ta), relative humidity (RH), vapor pressure difference (VPD), solar radiation (SR), and carbon dioxide (CO2) levels were monitored using standard methods, and data analysis was conducted using MINITAB software. Statistical analysis included descriptive statistics, analysis of variance (ANOVA), and t-tests. The results of the experiment showed that in the HUMITEM
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Adeleke University Journal of Engineering and Technology [AUJET] , 2023
Temperature management is a critical aspect of greenhouse farming as it significantly
influences... more Temperature management is a critical aspect of greenhouse farming as it significantly
influences plant growth, development, and overall health. This review examines various
strategies that are deployed to regulate the greenhouse microenvironment, particularly
air temperature, encompassing both traditional and innovative techniques. The review
focuses on the impact of external factors such as seasonal variations, climate conditions
and geographic location, greenhouse design and structure, and covering materials on the
dynamic nature of the greenhouse microenvironment. Additionally, internal factors such
as plant and management factors are discussed. A comprehensive analysis of the active
and passive strategies of greenhouse air temperature control is provided. The review also
emphasizes the importance of energy efficiency in greenhouse climate control,
highlighting the adoption of eco-friendly heating and cooling technologies. Furthermore,
the review explores emerging innovations such as smart greenhouse technologies, climate
models, and predictive analytics. In conclusion, this review seeks to consolidate current
knowledge and provides valuable insight into greenhouse temperature management,
offering beneficial guidance for growers and researchers aiming to optimize crop
production, efficient use of resources, and sustainable practices in a controlled
agricultural environment
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Adeleke University Journal of Engineering and Technology (AUJET), 2023
Temperature management is a critical aspect of greenhouse farming as it significantly influences ... more Temperature management is a critical aspect of greenhouse farming as it significantly influences plant growth, development, and overall health. This review examines various strategies that are deployed to regulate the greenhouse microenvironment, particularly air temperature, encompassing both traditional and innovative techniques. The review focuses on the impact of external factors such as seasonal variations, climate conditions and geographic location, greenhouse design and structure, and covering materials on the dynamic nature of the greenhouse microenvironment. Additionally, internal factors such as plant and management factors are discussed. A comprehensive analysis of the active and passive strategies of greenhouse air temperature control is provided. The review also emphasizes the importance of energy efficiency in greenhouse climate control, highlighting the adoption of eco-friendly heating and cooling technologies. Furthermore, the review explores emerging innovations such as smart greenhouse technologies, climate models, and predictive analytics. In conclusion, this review seeks to consolidate current knowledge and provides valuable insight into greenhouse temperature management, offering beneficial guidance for growers and researchers aiming to optimize crop production, efficient use of resources, and sustainable practices in a controlled agricultural environment.
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Nigerian Journal of Pure Applied Sciences, 2021
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Scientific African, Mar 1, 2020
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Acta Agriculturae Slovenica, Apr 8, 2018
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African Journal of Environmental Science and Technology, Jul 30, 2015
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Acta Technologica Agriculturae, Jun 1, 2018
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A 1000 kg double walled insulated mobile metallic silo was designed and constructed with two mild... more A 1000 kg double walled insulated mobile metallic silo was designed and constructed with two mild sheets of 1mm thickness using sawdust as an insulating material between the metal sheets. The silo has a total height of 1.2m above the ground level with an internal and external diameter of 0.64 m and 0.68 m respectively and resting on a platform which has four wheels attached to it for mobility. A preloading assessment was conducted on the silo to determine the possibility of using sawdust as an insulator in the silo. Comparison was also made between the single walled aluminium sheet silo placed on a platform and the double walled insulated mobile metallic silo to determine thermal performance. Temperature readings were taken 3 times for each time interval for 10 days using a therma waterproof K thermocouple model 232-101. The result showed that the temperature reading was usually low by 8:30am within the double walled silo having a least temperature of 23.9 0 C, while the highest temperature for double walled silo was at 12:30pm with 33.6 0 C and the result also showed that the temperature reading was usually low by 8:30am within the single walled silo having a least temperature of 25.2 0 C while highest temperature for single walled silo was at 12:30pm having a range of 36.6 0 C. The double walled mobile metallic silo moved smoothly on a flat untilled road by pushing without a jolting action and undulating movement. In conclusion, the double walled mobile metallic silo performed better than the single walled silo and has a good thermal property which is suitable for the storage of grains in tropical region for low income farmer.
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Journal of Emerging Trends in Engineering and Applied Sciences, Oct 1, 2013
Climatic data on rainfall, evaporation, relative humidity, maximum and minimum atmospheric temper... more Climatic data on rainfall, evaporation, relative humidity, maximum and minimum atmospheric temperature, soil temperature and sunshine hours were obtained from the National Bureau of Statistics (NBS) for a decade (2002 - 2011) while crop yield data were sourced from Kwara State Agricultural and Development Project (KWADP). These data were analysed in order to evaluate the impact of climate on the cultivation of maize, sorghum, rice, millet and cowpea in Kwara State, Nigeria. Multiple regression, trend analysis and correlation analytical techniques were used to analyze the data. The result obtained shows that the impact of climate on grain cultivation is significant for maize and rice yield at 95% probability levels. This implies that climate has a strong linear correlation with two of the selected crops within the years under review. As a result, it is recommended that investment should be made in to supplement rain-fed agriculture under these practices of extensive agricultural extension services, adoption of modern agricultural techniques and provision of agro-chemicals to farmers. Agricultural yield in the study area will be greatly improved if the above recommendations and other government policies are put in place. This study aimed at determining the relationship that exists between grain crops yield and climatic parameters. The result of the analysis of data collected showed that climatic parameters had significant impact on yield in the study area.
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Iranica journal of energy and environment, 2020
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Papers by Timothy D . Akpenpuun, PhD
influences plant growth, development, and overall health. This review examines various
strategies that are deployed to regulate the greenhouse microenvironment, particularly
air temperature, encompassing both traditional and innovative techniques. The review
focuses on the impact of external factors such as seasonal variations, climate conditions
and geographic location, greenhouse design and structure, and covering materials on the
dynamic nature of the greenhouse microenvironment. Additionally, internal factors such
as plant and management factors are discussed. A comprehensive analysis of the active
and passive strategies of greenhouse air temperature control is provided. The review also
emphasizes the importance of energy efficiency in greenhouse climate control,
highlighting the adoption of eco-friendly heating and cooling technologies. Furthermore,
the review explores emerging innovations such as smart greenhouse technologies, climate
models, and predictive analytics. In conclusion, this review seeks to consolidate current
knowledge and provides valuable insight into greenhouse temperature management,
offering beneficial guidance for growers and researchers aiming to optimize crop
production, efficient use of resources, and sustainable practices in a controlled
agricultural environment
influences plant growth, development, and overall health. This review examines various
strategies that are deployed to regulate the greenhouse microenvironment, particularly
air temperature, encompassing both traditional and innovative techniques. The review
focuses on the impact of external factors such as seasonal variations, climate conditions
and geographic location, greenhouse design and structure, and covering materials on the
dynamic nature of the greenhouse microenvironment. Additionally, internal factors such
as plant and management factors are discussed. A comprehensive analysis of the active
and passive strategies of greenhouse air temperature control is provided. The review also
emphasizes the importance of energy efficiency in greenhouse climate control,
highlighting the adoption of eco-friendly heating and cooling technologies. Furthermore,
the review explores emerging innovations such as smart greenhouse technologies, climate
models, and predictive analytics. In conclusion, this review seeks to consolidate current
knowledge and provides valuable insight into greenhouse temperature management,
offering beneficial guidance for growers and researchers aiming to optimize crop
production, efficient use of resources, and sustainable practices in a controlled
agricultural environment