Passive solar building

Introduction
What are passive solar building
How does passive solar building use sun’s power
How does it work
Passive solar design (rule of thumb)
System involved
Material consideration
Benefits
Usages among countries
Levels of application
Passive solar draught cooling
Advantages
Disadvantages
Conclusion

1. PASSIVE SOLAR BUILDING Presented by: SHANKHA SHUBHRA GOSWAMI Indira Gandhi Institute of Technology (IGIT), Sarang Department of Mechanical Engineering PhD Research Scholar

2. CONTENTS Introduction What are passive solar building How does passive solar building use sun’s power How does it work Passive solar design (rule of thumb) System involved Material consideration Benefits Usages among countries Levels of application Passive solar draught cooling Advantages Disadvantages Conclusion

3. INTRODUCTION industrial and technological innovation, population growth, and rapid urbanization lead to increase in energy consumption. dependency on foreign sources of energy and their negative impact have made energy efficiency and conservation critical issues. 35 -40% of our energy is consumed by building and 85% of that is needed solely for heating. -

4. What are passive solar building? Passive solar building have, windows, walls and floors made to collect, store and distribute solar energy in the form of heat in winter and reject solar in summer.

5. HOW DOES PASSIVE SOLAR BUILDING USE SUN’S POWER Use of shading devices to reduce heating by radiant (solar energy) in summer and allow in winter. Utilize thermal energy convection (hot air rises) to maximize heating convection in winter. Utilize thermal storage (mass effect) to transfer excess heating capacity from daylight to night time hrs.

6. How does it work? passive solar building are designed to let heat into the building during the winter months and block out the sun during the summer days. This can be archives by passive solar building design elements such as shading, implementing large south facing windows and building materials that absorb and slowly release suns heat.

7. PASSIVE SOLAR DESIGN (RULE OF THUMB) The building should be elongated on east –west axis. The building south face should receive sunlight between the hours of 9 am and 3 pm. Interior spaces requiring the most light and heating and cooling should be along the south face of the building. An open floor plan optimizes the passive system operation. Use shading to prevent the summer sun entering the interior. Sun angels can help u calculating the overhanging calculation. Passive solar is an excellent idea to heat, cool and lightening the living room based on the structure of the building. Passive solar energy is used to distribute heat or cool through wise selection pf building materials. Passive solar energy will provide inexpensive sustainable alternatives of heating and cooling of home. Passive solar energy is used to collect and store and distribute the thermal energy by means of conduction ,convection and radiation. Decrease the amount of money that we spend on energy.

8. System involved DIRECT GAIN ISOLATED GAIN INDIRECT GAIN

9. MATERIAL CONSIDERATION When designing energy efficient buildings it is necessary to know the solar heat gain of materials used on the structure exterior. Glass and plastic blocks. Patterned glazing. Skylights. Sunshades. Roof structure. Tubular daylighting devices. Electrochromic and photochromic glazing. Translucent or solar absorbent product.

10. BENEFITS Transmit all the visible light frequencies making the home interior brighter. Provides glide control in bright, sunny climate. Blocks ultraviolet energy. Blocks up to 99.99% of UV radiation compared to glass unit. Prevents fading of interior fabrics and décor. Low e-characteristic reflects furnace hear back into room and provides low u-value insulation properties. Reduces furnaces heat losses. helps to reduce heating energy cost.

11. USUAGE AMONG COUNTRIES

12. LEVELS OF APPLICATION Paramagnetic Annualized Minimum machinery Zero energy building

13. PASSIVE SOLAR DRAUGHT COOLING Passive down draft evaporating cooling system consist of a down draft tower with well cellulose pads at the top of the tower. Water is distributed on the top of the pads collected at the bottom of the sump and re-circulated by a pump. These towers are often described as reverse chimney. While the column of warm air rises in chimney, in the case the column cool air falls. The air flow depends on the efficiency of the evaporative cooling device, tower height and cross section as well as the air flow in the cooling device.

14. ADVANTAGES OF PASSIVE SOLAR BUILDING Eliminating heating and cooling cost Reduce greenhouse gas emission Clean process Ecofriendly Cost Attractive living environment Low maintenance Unwavering comfort

15. Disadvantages OF PASSIVE SOLAR BUILDING The initial cost is high. solar energy cant be collected in cloudy and rainy days. The storage is quit expensive. Uses a lot of spaces. Associated with pollution.

16. CONCLUSION They can perform effortless and quietly with out mechanical or electrical assistance Simple techniques can make a huge difference in comfort and energy consumption through a year. Reduction can be made to heating bills as much as 40 % annually, and also improve the comfort of living spaces.