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Proceedings ArticleDOI

Effect of packing factor of photovoltaic module on performance of photovoltaic-thermal (PVT) greenhouse solar dryer

TL;DR: In this article, an attempt has been made to evaluate the effect of packing factor of photovoltaic (PV) module on the performance of hybrid PV-thermal (PVT) greenhouse solar dryer.
Abstract: In the present study, an attempt has been made to evaluate the effect of packing factor of photovoltaic (PV) module on the performance of hybrid photovoltaic-thermal (PVT) greenhouse solar dryer. Different parameters have been evaluated for climatic condition of Indian Institute of Technology, New Delhi (28_350N, 77_120E, 216 m above MSL), India. For the analysis solar radiation and ambient air temperature have been taken from IMD (Indian Meteorological Department) Pune. Further thermal modelling has been done for the PVT greenhouse dryer and different parameter like crop temperature, greenhouse temperature, outlet air temperature and cell temperature have been calculated with variation of packing factor of PV module by the help of MATLAB program. Further effect of packing factor on thermal energy, electrical energy, overall thermal energy, cell efficiency have been evaluated. Variation in thermal energy, electrical energy, and overall thermal energy with respect to packing factor found to be 3.66–2.05, 0–0.92 and 3.66–4.47 kWh respectively for a typical day of June.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors present an overview of the most recent technological advances in modern greenhouses, and highlight their application in hardware design, environmental monitoring, dynamics modeling, microclimate control, energy optimization, green energy integration and storage systems implementation.
Abstract: Greenhouse technology is an opportune tool for increasing crop yields through the accurate adjustment of internal climate growth conditions such as temperature, humidity, light intensity and CO2 concentration. The aim of this paper is to present an overview of the most recent technological advances in modern greenhouses, and highlights their application in hardware design, environmental monitoring, dynamics modeling, microclimate control, energy optimization, green energy integration and storage systems implementation. The main objectives can be summarized in presenting sufficient contributions to the new body of knowledge and gathering the recent greenhouse progress in order to support greenhouse engineers, researchers and industrials to achieve higher yields at minimum possible cost. The results reveal that the work carried out over the last 5 years has shown that research and development projects have lent a lot of interest in favor of the greenhouse crops sector. From structural hardware point of view, the choice of an agricultural greenhouse design to meet the economic conditions of greenhouse growers always remains a challenge for the designer. The results report that research concentration has moved from classical controllers to modern ones based on the environment explicit perception. Investigations report that renewable energies such as solar and geothermal became widely used as an environmentally friendly solution and have proven to make greenhouses not only energy self-sufficient but also allow the energy exchange with the electric grid.

27 citations

01 Jan 1979

8 citations

Journal ArticleDOI
TL;DR: In this paper , the authors present a comprehensive understanding framework of the actual greenhouse development in Qatar, so as to be able to support the transition to sustainable precision agriculture, and analyze the future development of the local greenhouse sector in terms of sustainability and resource-saving perspective and its penetration into Qatar's economy.
Abstract: Abstract Greenhouse farming is essential in increasing domestic crop production in countries with limited resources and a harsh climate like Qatar. Smart greenhouse development is even more important to overcome these limitations and achieve high levels of food security. While the main aim of greenhouses is to offer an appropriate environment for high-yield production while protecting crops from adverse climate conditions, smart greenhouses provide precise regulation and control of the microclimate variables by utilizing the latest control techniques, advanced metering and communication infrastructures, and smart management systems thus providing the optimal environment for crop development. However, due to the development of information technology, greenhouses are undergoing a big transformation. In fact, the new generation of greenhouses has gone from simple constructions to sophisticated factories that drive agricultural production at the minimum possible cost. The main objective of this paper is to present a comprehensive understanding framework of the actual greenhouse development in Qatar, so as to be able to support the transition to sustainable precision agriculture. Qatar’s greenhouse market is a dynamic sector, and it is expected to mark double-digit growth by 2025. Thus, this study may offer effective supporting information to decision and policy makers, professionals, and end-users in introducing new technologies and taking advantage of monitoring techniques, artificial intelligence, and communication infrastructure in the agriculture sector by adopting smart greenhouses, consequently enhancing the Food-Energy-Water Nexus resilience and sustainable development. Furthermore, an analysis of the actual agriculture situation in Qatar is provided by examining its potential development regarding the existing drivers and barriers. Finally, the study presents the policy measures already implemented in Qatar and analyses the future development of the local greenhouse sector in terms of sustainability and resource-saving perspective and its penetration into Qatar’s economy.

7 citations

Proceedings ArticleDOI
01 Dec 2022
TL;DR: In this paper , phase change material and a secondary heating system were integrated with the greenhouse dryer that helps to improve its operations hours even after sunset along with improvement in thermal efficiency, and various combinations like integration of PCM, nano-particle, and packing factor were designed to the cell temperature and improve its thermal and electrical performance.
Abstract: The Homosapien's growth increases energy needs for their existence, yet the energy supplies from all major sources are restricted. Renewable energy sources such as solar energy, geothermal energy, and wind energy are viable options for fulfilling future demand without creating any harm to the environment. Photovoltaic thermal and greenhouse dryer systems allow us to utilize solar energy in a desirable form, such as heat and power. It is observed that the cell temperature and low operation hours are the primary concern for the PVT and greenhouse dryer respectively. Various innovations are identified from the literature to enhance the performance of these systems. Phase change material and a secondary heating system were integrated with the greenhouse dryer that helps to improve its operations hours even after sunset along with improvement in thermal efficiency. In the same manner, various combinations like integration of PCM, nano-particle, and packing factor were designed to the cell temperature and improve its thermal and electrical performance.
Proceedings ArticleDOI
01 Dec 2022
TL;DR: In this paper , phase change material and a secondary heating system were integrated with the greenhouse dryer that helps to improve its operations hours even after sunset along with improvement in thermal efficiency, and various combinations like integration of PCM, nano-particle, and packing factor were designed to the cell temperature and improve its thermal and electrical performance.
Abstract: The Homosapien's growth increases energy needs for their existence, yet the energy supplies from all major sources are restricted. Renewable energy sources such as solar energy, geothermal energy, and wind energy are viable options for fulfilling future demand without creating any harm to the environment. Photovoltaic thermal and greenhouse dryer systems allow us to utilize solar energy in a desirable form, such as heat and power. It is observed that the cell temperature and low operation hours are the primary concern for the PVT and greenhouse dryer respectively. Various innovations are identified from the literature to enhance the performance of these systems. Phase change material and a secondary heating system were integrated with the greenhouse dryer that helps to improve its operations hours even after sunset along with improvement in thermal efficiency. In the same manner, various combinations like integration of PCM, nano-particle, and packing factor were designed to the cell temperature and improve its thermal and electrical performance.
References
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Journal ArticleDOI
TL;DR: In this article, a simplified procedure for predicting the long term, monthly average electrical output of photovoltaic arrays is presented, restricted to passively cooled, max-power tracked arrays, but is applicable to both south facing, fixed flat arrays and 2-D tracked concentrators.

626 citations

01 Jan 1980
TL;DR: In this paper, a simplified procedure for predicting the long term monthly average electrical output of photovoltaic arrays is presented, restricted to passively cooled max-power tracked arrays, but is applicable to both south facing fixed flat arrays and 2-D tracked concentrators.
Abstract: A simplified procedure for predicting the long term monthly average electrical output of photovoltaic arrays is presented. It is restricted to passively cooled max-power tracked arrays, but is applicable to both south facing fixed flat arrays and 2-D tracked concentrators. The procedure combines basic parameters characterizing the array with the local monthly mean temperature and the monthly K/sub T/ to yield a monthly average array efficiency which, when multiplied by the monthly array insolation gives the electrical energy output.

594 citations

Journal ArticleDOI
TL;DR: A comprehensive review of the various designs, details of construction and operational principles of the wide variety of practically realized designs of solar-energy drying systems reported previously is presented in this article.
Abstract: In many countries of the world, the use of solar thermal systems in the agricultural area to conserve vegetables, fruits, coffee and other crops has shown to be practical, economical and the responsible approach environmentally. Solar heating systems to dry food and other crops can improve the quality of the product, while reducing wasted produce and traditional fuels—thus improving the quality of life, however the availability of good information is lacking in many of the countries where solar food processing systems are most needed. Solar food dryers are available in a range of size and design and are used for drying various food products. It is found that various types of driers are available to suit the needs of farmers. Therefore, selection of dryers for a particular application is largely a decision based on what is available and the types of dryers currently used widely. A comprehensive review of the various designs, details of construction and operational principles of the wide variety of practically realized designs of solar-energy drying systems reported previously is presented. A systematic approach for the classification of solar-energy dryers has been evolved. Two generic groups of solar-energy dryers can be identified, viz. passive or natural-circulation solar-energy dryers and active or forced-convection solar-energy dryers. Some very recent developments in solar drying technology are highlighted.

414 citations

Journal ArticleDOI
TL;DR: In this paper, the authors assessed the climate conditions inside a greenhouse in which 50% of the roof area was replaced with photovoltaic (PV) modules, describing the solar radiation distribution and the variability of temperature and humidity.

187 citations


"Effect of packing factor of photovo..." refers background in this paper

  • ...[7] have been evaluated the shading effect of PV modules on the crop drying rate inside the PVT greenhouse dryer....

    [...]

Journal ArticleDOI
TL;DR: In this article, an attempt has been made to validate the thermal model with experimental results of a typical day August, 25, 2006 for clear weather condition of New Delhi, India has been carried out.

176 citations


"Effect of packing factor of photovo..." refers background in this paper

  • ...Nayak and Tiwari have analysed photovoltaic/thermal integrated greenhouse dryer proposed model to calculate energy and exergy [5]....

    [...]