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Modeling And Optimization of Phase Change Materials Storage System in Greenhouse Applications

Sedighi, Amir Saeed | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57175 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin
  7. Abstract:
  8. This research develops a simulation model and algorithm to calculate the thermal demand of a one-hectare Venlo greenhouse and explores the impact of using phase change materials (PCMs) on this type of greenhouse. The algorithm controls variables like solar irradiance, artificial lighting, greenhouse humidity, carbon dioxide levels, ventilation rates, injected CO2, and shading systems, alongside greenhouse temperatures to create a system that closely mimics a real greenhouse environment. Subsequently, this model integrates with a PCM model to investigate the effects of these materials comprehensively. In this research, the heat demand of the greenhouse is calculated and compared for the geographic locations of Tehran and Switzerland under two scenarios: using industrial waste heat and fossil fuel consumption, and in two conditions: with and without phase change materials. The use of fossil fuels and industrial waste heat significantly affects the performance of phase change materials in greenhouses due to different temperature control approaches in these two scenarios. Simulation results indicate that in the fossil fuel consumption scenario, the ambient temperature and the temperature difference between day and night play a key role in the performance of phase change materials. This is because the diurnal temperature variations allow for the storage of excess energy during the day in these materials and its release at night. On the other hand, the use of phase change materials does not reduce peak energy demand in the fossil fuel scenario, as there is no excess energy to store during the cold months of the year. The optimal phase change material for greenhouse energy savings among various phase change materials is S19, which reduces the annual energy demand in Tehran by up to 19.2%. Hydrated salts, due to their higher latent heat capacity, perform better than organic materials in smaller volumes, although organic materials show better performance with increased volume. Additionally, the use of these materials impacts greenhouse humidity management and reduces the use of the ventilation system by up to 50% in Switzerland. In scenarios using waste heat, PCMs enabled a reduction in peak energy demand, allowing for more efficient energy use and enabling larger greenhouse operations under the same energy quota
  9. Keywords:
  10. Phase Change Material (PCMs) ; Greenhouse Energy Modeling ; Energy Management ; Greenhouse Heating Demand ; Industrial Wastes ; Sustainable Energy ; Industrial Waste Heat

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