Concerns related to increasing CO 2 emission and its effects on global warming and climate change have been increased with increasing the global consumption of fossil fuels. One solution to respond to this challenge is the development and utilization of carbon capturing and storage technologies. Among different carbon capturing technologies, direct air capture (DAC) reduces CO 2 emissions from air. While the technology readiness level (TRL) of DAC is in the demonstration stage, identifying the commercialization research gaps and possible opportunities can help with diffusion and adoption of the technology. This research uses a knowledge discovery in research databases, based on bibliometric analysis and data mining, to understand DAC research and development's current status and future. Then, we identify the critical areas of the research gap for commercialization. The bibliometric analysis results show that DAC has not yet reached its maturity level compared with other carbon capture technologies (CCTs). However, there are different opportunities for the development of this technology.The results indicate that (a) new systematic designs, improvement in nano-catalysts, increase in the capturing capacity, (b) economic and investment improvements in combination with the environmental assessment of the optimized DAC technology, (c) assessment of future prospects, (d) integration with alternative energy supply sources especially renewable energy to respond to the required energy and process integration with current carbon emitted processes, (e) technology demonstration and readiness assessment, and (f) policy and uncertainty analysis of the market are the key areas that should be investigated for the success of this technology in the competitive market.

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Limited resources and suitable farming lands, climate changes, and fast population growth are among the main concerns of the societies that bring security challenges to the governments. One solution to overcome these challenges is creating controlled areas for cultivation, growing plants, and farming, such as a greenhouse. greenhouses signi cantly improve the e ciency of land use in agriculture, both increasing the crop yield and the number of harvesting throughout the year, which has long proved their effectiveness. Although the history of greenhouses for farming is from Roman times, however, there are different barriers to their applications. Energy supply to control the cultivation conditions of the plants for greenhouses, in particular for heating and cooling for hot and cold climate areas, are an example. On the other hand, based on the global energy trend, decentralized energy production based on solar energy is highly regarded. Greenhouses also like households have signi cant potential to harvest solar energy but since greenhouses need sunlight to cultivate plants, reducing sunlight by using common solar panels is not a logical action. However, by implementing semitransparent solar cells in these greenhouses, the issue of reduced sunlight could be addressed and a further improvement in e ciency by mitigating energy demand in these greenhouses could be achieved. This research is to investigate the integration of the energy supply system with consumption in greenhouses. First, we assess different conventional types of greenhouses in terms of energy demand. Then, we investigate the energy demand with OPV integration for each type. Finally, the best design of the greenhouse for OPV integration is recommended. Resultsshow that Flat-arch geometry is the best choice for dry and cold climates while Sawtooth geometry showed better improvements in tropical climates. In both temperate/mesothermal and continental/microthermal climates, A-frame geometry showed superiority in energy-saving. Simulations revealed an annual electricity generation of 6.9 MWh to 9.9 MWh for the optimum structural geometries that decrease the energy consumption of greenhouses. HighlightsUtilizing semitransparent solar cells to provide the greenhouse's required energy.modeling the greenhouse's energy consumption in different climate conditions.Comparing load and electricity generation in different structural geometry shapes.Determining the best structural geometry shape from an energy-saving viewpoint.Achieving up to 58% energy-saving after installation of the OPV.

Limited resources and suitable farming lands, climate changes, and fast population growth are among the main concerns of the societies that bring security challenges to the governments. One solution to overcome these challenges is creating controlled areas for cultivation, growing plants, and farming, such as a greenhouse. greenhouses significantly improve the efficiency of land use in agriculture, both increasing the crop yield and the number of harvesting throughout the year, which has long proved their effectiveness. Although the history of greenhouses for farming is from Roman times, however, there are different barriers to their applications. Energy supply to control the cultivation conditions of the plants for greenhouses, in particular for heating and cooling for hot and cold climate areas, are an example. On the other hand, based on the global energy trend, decentralized energy production based on solar energy is highly regarded. Greenhouses also like households have significant potential to harvest solar energy but since greenhouses need sunlight to cultivate plants, reducing sunlight by using common solar panels is not a logical action. However, by implementing semitransparent solar cells in these greenhouses, the issue of reduced sunlight could be addressed and a further improvement in efficiency by mitigating energy demand in these greenhouses could be achieved. This research is to investigate the integration of the energy supply system with consumption in greenhouses. First, we assess different conventional types of greenhouses in terms of energy demand. Then, we investigate the energy demand with OPV integration for each type. Finally, the best design of the greenhouse for OPV integration is recommended. Results show that Flat-arch geometry is the best choice for dry and cold climates while Sawtooth geometry showed better improvements in tropical climates. In both temperate/mesothermal and continental/microthermal climates, A-frame geometry showed superiority in energy-saving. Simulations revealed an annual electricity generation of 6.9 MWh to 9.9 MWh for the optimum structural geometries that decrease the energy consumption of greenhouses.