This document discusses the design of a green building with optimal solar energy generation and human comfort. It outlines the steps to size a solar photovoltaic system to meet the building's power needs. Computational fluid dynamics is used to model air flow and ventilation in the building. The modeling shows stagnation points and improved ventilation with the addition of solar chimneys and strategically placed vents and outlets.

1. GREENBUILDINGSBY:LOKESH ZOPE – 0715048PROJECT GUIDE: PROF. V. S. NARWANE

2. WHY DO WE NEED TO THINK ABOUT BUILDINGS?Buildings consume almost one-third of the total energy produced

3. Problems of energy crisis are impending

4. Buildings are the places where humans spend their maximum time A conducive environment to work is always beneficial for efficient work output

5. RESOURCE OPTIMIZATIONHUMAN COMFORT

6. SOLAR GRID-TIE CONNECTIONSUN

7. HOW TO SIZE?SYSTEM REQUIREMENTINVESTMENT

8. ORIENTATIONSUNPATHAZIMUTH ANGLE:Ø

9. IV CURVE FOR SOLAR PHOTO-VOLTAICIV curve of Solar Photo-Voltaic Operating Point

10. Maximum Power Point Trackers

11. DESIGN PROCEDURE

12. 1. SYSTEM SIZINGPac = Power required (KWh/yr) = 620000 =340KW Hours/day of 1Sun x 365 days/yr 5 x 365Pdcstc = Pac = 340/0.97 = 350KW Conversion Efficiency

13. 2. ORIENTATIONNTilt angle = 90 – βNWhere, βN= 90° - L + δ δ = 23.45 sin[(360/365)(n-81)]

14. TILT ANGLEOPTIMUM ANGLE: 18.82°

15. 3.1 SELECTION OF PANELS

17. 3.2 SELECTION OF INVERTER

19. 4. ECONOMICSTotal investment = Cost of inverter + cost of panels + cost of connectors + cost of module maintenance systems + installation charges Cost of inverters: $4000 x 35 = Rs. 6.5 croreCost of solar photovoltaic panels: Rs.23700 x 1155 = Rs. 2.7 crore Total cost: Rs. 9.2 croreApproximately total investment: Rs. 10 CroreThe total cost spent in buying power per year: Rs. 72,00,000 Total money saved: First 5 years: full efficiency (i.e. the system will provide entire power) Rs. 72,00,000 x 5 = Rs. 3.6 Crore Next 7 years: 90% efficiency Rs.72,00,000 x 0.9 x 7 = Rs. 4.536 Crore Next 13 years: 80% efficiency Rs. 72,00,000 x 0.8 x 13 = Rs. 7.488 Crore (The company of the panels provide the product guarantee of above efficiencies)Total saving for 25 years after installation: Rs. 15.622 Crore Inflation rate of cost of power Investment gains

20. 105ARRAY11300W x 1155 Panels : 346 KW : 11 x 10511 Panels : Max voltage: 36.86 x 11 = 405VInverter Input Voltage : 300V – 600V35

21. HUMAN COMFORT Human body = Heat producing machine

22. Q = m. Cv. δT

23. Forced convectionUSAGE OF COMPUTATIONAL FLUID DYNAMICSFinite element method Modeling

24. Fluid flow conditions

25. Include temperature, velocity, pressure

26. Find stagnation point

27. Find pathlines

28. Strategically placing chimneys and inlets and outlets

29. Re-modelingDEPARTMENTAL LIBRARY N

30. ROOM MODELLING IN ICEM-CFD

31. MESH

32. MESH CUT PLANE

33. MESH TOP VIEW