Methodology Objectives Greehouse Analysis for Strawberry Crops Fernando De Howitt (200053) Gabriel Gomez (204438) Nicolas Herrera (201713) Mateo Ormaza (204684) Heat Transfer (NRC: 3371) Simulations Results To design the greenhouse, first we needed to analyze the modes of heat transfer present inside and outside the structure We found that outside the heat transfer results from natural convection and radiation from the sun To maintain the conditions, inside we need to have forced convection, and there is also radiation from the earth To obtain the properties of the air to maintain the inside temperature at 20 ° C we used historic ambient air temperatures in Cumbaya and average satellite radiation data at the same location After that we made an energy balance and calculated the convection coefficients outside and inside With this we calculated the necessary inside air velocity To maintain the inside at 70 % relative humidity and to make the air move at the calculated velocity we introduced an AC system inside the greenhouse For this system, the air is absorbed from the outside, dehumidified, heated, and accelerated with a fan Then the air is circulated through a changing cross - sectional area rectangular pipe and distributed through the entire greenhouse Parameters used in the simulations General : • Design a greenhouse capable of maintaining ideal conditions for planting strawberries Specific : • Research the methods used in greenhouses to control the climate • Develop mathematical models to understand the different conditions present inside a greenhouse • Utilize the knowledge acquired in class Figure 1: dimensions of the greenhouse Figure 3: Simulation results for the temperatura at the walls of the greenhouse Figure 4. Simulation results for the Radiative heat flux wall of the greenhous q convection outside 1523.06 q radiation 35041.17 q convection inside 33518.11 Inner flow velocity 11.85 Duct volume flow rate [Cfm] 13709.78 Number of diffusers 6 Power of fan [kW] 16.88 Figure 6: streamlines of the air at the exit of the AC pipe system Figure 5. Simulation results for the Adjacent temperature of the walls in the greenhous Figure 2: Energy balance of the greenhouse • When analyzing all the theoretical results, effectively the design of the green house was made • The analysis of the different convection coefficients and the velocity presented on the table below, are correct when compar ing with the literature. • The use of the simulation using the calculated parameters helped in seeing how the flow of the air is going to be in our gree n h ouse, helping in the understanding of the extracted values. • There was some extra research, specially for doing the ducts that were necessary for this green house,. Figure 3: Radiation e nergy balance of the greenhouse Figure 7: Internal temperature in the midplane along the greenhouse Table 1: Extracted parameters