THIS STUDY PRESENTS AN APPROACH TO SIMULATING BUILDING-INTEGRATED PHOTOVOLTAIC GLAZING SYSTEMS COMPOSED OF SEMITRANSPARENT ORGANIC PHOTOVOLTAIC (ST-OPV) ELEMENTS. THE APPROACH CONSISTS OF A MATHEMATICAL COSIMULATION MODEL BASED ON THE ENERGY BALANCE OF COMPLEX GLAZING SYSTEMS, CONSIDERING HEAT TRANSFER AS CONDUCTION, MIXED CONVECTION, AND RADIATION EFFECTS. THE COSIMULATION METHOD IS BASED ON A FUNCTIONAL MOCK-UP UNIT (FMU) DEVELOPED IN PYTHON AND THE BUILDING SIMULATION PROGRAM DOMUS. THIS WORK AIMS AT PRESENTING A COSIMULATION TECHNIQUE THAT CAN BE EASILY APPLIED TO BUILDING ENERGY SIMULATION TOOLS FOR THE ASSESSMENT OF PHOTOVOLTAIC ENERGY GENERATION IN GLAZING SYSTEMS. THE COSIMULATION GLAZING MODEL WAS VERIFIED ACCORDING TO ANSI/ASHRAE STANDARD 140-2011, AND THE ZONE TEMPERATURE WAS KEPT WITHIN WITH A ROOT MEDIUM SQUARE ERROR (RMSE) OF 1.45 °C. THE SIMULATED BUILDING WITH AN ST-OPV SYSTEM SHOWED PROMISING RESULTS AND COULD BE APPLIED TO NEAR-ZERO ENERGY BUILDINGS SINCE EACH 6-M2 GLAZING HAS A POWER GENERATION OF AROUND 77 W, EQUIVALENT TO 9% OF AVAILABLE SOLAR RESOURCE.

ABSTRACT?IN THE PRESENT WORK, A PARAMETRIC STUDY OF THE INFLUENCE OF EXTERNAL VENTILATION IN THE BEHAVIOR OF THE THERMAL CHARACTERISTICS OF A REAL GREENHOUSE IS DEVELOPED BY USING A NUMERICAL MODEL IMPLEMENTED IN THE COMPUTATIONAL FLUID DYNAMICS SOFTWARE ANSYS FLUENT 2019R3. SUCH MODEL ALLOWS TO CORRECTLY DESIGN AN AUTOMATIC CONTROL OF THERMAL PROPERTIES IN GREENHOUSES. TWO DIFFERENT MODELS ARE PRESENTED, THE FIRST ONE USES NATURAL VENTILATION AND THE SECOND MODEL USES FORCED VENTILATION BY USING 22 FANS OF 40 CM OF RADIUS EACH. ONLY THE FIRST MODEL INCLUDES THE EXTERNAL FLUID DOMAIN. THE CULTIVATED CROP IS LETTUCE AND ITS INFLUENCE IN THE MODEL IS INCLUDED AS A POROUS MEDIA AND A WATER VAPOUR SOURCE. SOLAR RADIATION IS ADDED USING THE SURFACE TO SURFACE MODEL (S2S) AND IN ORDER TO INCLUDE THE AIR HUMIDITY, THE LOCAL MASS FRACTION IS PREDICTED THROUGH THE SOLUTION OF A CONVECTION-DIFFUSION EQUATION FOR EACH SPECIES. RESULTS FROM THE FIRST MODEL SHOWS THAT THE TEMPERATURE DISTRIBUTION IS UNEVEN INSIDE THE GREENHOUSE AND MOST IMPORTANT THAT THE THERMAL CHARACTERISTICS ARE NOT THE RECOMMENDED FOR THE LETTUCE CROP. THE SECOND MODEL SHOWS THAT AFTER REACHING THERMAL EQUILIBRIUM THE AVERAGE TEMPERATURE IS REDUCED A 175 % AND THE RELATIVE HUMIDITY INCREASE 13.5 % BY VARYING THE FAN INLET VELOCITY FROM 1 TO 10 M/S, WHILE A CHANGE IN THE INLET TEMPERATURE FROM 2 C TO 20 C AND CONSTANT VELOCITY CHANGES THE AVERAGE TEMPERATURE IN 82% AND THE RELATIVE HUMIDITY IN 4.7%. FINALLY A VARIATION FROM 10 TO 100 % OF THE RELATIVE HUMIDITY AT THE INLET DOES NOT AFFECT THE AVERAGE TEMPERATURE BUT INCREASE THE RELATIVE HUMIDITY 24% INSIDE THE GREENHOUSE.