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Development of Computational Fluid Dynamics Model for Spatial Distribution of Greenhouse Temperature and Humidity Considering Plant Evapotranspiration

Nikkhah, Amir Farzin | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55319 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Roshandel, Ramin
  7. Abstract:
  8. The purpose of this study is to develop a simulated model of a greenhouse using two different ventilation systems, a fan&pad system and an air-soil converter equipped with a sprinkler in order to compare the cooling performance of these two systems in hot seasons. The main focus of the analysis of the results is on how the temperature and humidity are distributed throughout the greenhouse space. In order to develop a three-dimensional model with computational fluid dynamics method, greenhouse simulation in Ansis software has been used. The development of ventilation model in the greenhouse is done by creating boundary conditions using optimal design. Also, to simulate soil-air conditioning in the greenhouse, a three-dimensional model of pipes buried in soil integrated with injection mist was first developed. The effect of plant cover has been considered using the plant evapotranspiration model and the porous space model in the greenhouse air flow equations. Analysis of results gives decision makers tools to planners for proper greenhouse design .Technical analysis of ventilation in the greenhouse shows that the temperature distribution in Fenoped greenhouse is 6 degrees difference and air-soil ventilation is 2.8 degrees heterogeneity. The time required for the fan&pad greenhouse temperature to reach the desired plant temperature is 4.5 hours and in the air-soil greenhouse is 2.5 hours. The heterogeneity interval of 10% relative humidity in both cases and the optimum average of 45% is observed in Fan&pad greenhouse and 38% in greenhouse with air-soil converter
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Plant Evapotranspiration ; Fogging System ; Air-Soil Heat Exchanger ; Fan and Pad Ventilation System ; Greenhouse Simulation

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