Figure 1 shows that the maximum embodied non-renewable energy of one IAY unit is 44,394 Mega Joules if one adopts stone roofing and 230 mm solid brick wall. Stone has negligible embodied energy, however, the use of brick bat coba as roof waterproofing has made it energy intensive. The combination of micro concrete tile roof with CSEB has the lowest embodied non renewable energy (11,920 mega Joules). Therefore, if micro-concrete tiles and CSEB are used in 10,000 IAY units, there will be a saving of 324 trillion joules of embodied energy equivalent to 90 Giga watts of electricity with respect to the option of solid brick wall and stone roof. If one constructs 10,000 IAY units with micro concrete tile roof with CSEB wall, there will be a reduction in CO2 emission by 52,000 tons compared to that of the emission by stone roofing and 230 mm solid brick wall. The quantitative aspect of different construction technologies shown in the below Figures is useful for measuring IAY’s speed of approaching greenness. However, one would need a process of calculating the greenness index of each IAY shelter based on which appropriate incentives could be given to the deserving HHs. The following section presents a simple process that measures how green an IAY shelter could be. Figure 1: Pattern of embodied non-renewable energy: Different walling & roofing technologies Quantities of Embodied non renewable energy in Mega Joules of one IAY unit=66 combinations of wall + roof 50000.00 45000.00 40000.00 35000.00 30000.00 25000.00 20000.00 15000.00 10000.00 5000.00 0.00
11920
44394
RCC slab
RCC RCC FC MCT Hybrid Filler pink channelchannel roofing slab slab joist
230 mm solid brick massonry 150 mm ICSMB massonry
Stone Jack Corb bk Corb bk roof arch arch Pyramid
230 mm rat-trap massonry Stone Conc block massonry
CSMB massonry 380 mm CRS massonry
Source : Based on APPEP database. 2001
Figure 5.2: Pattern of CO2 emission: Different walling and roofing technologies
Corbelled arch
Jack arch
Stone roof
Filler slab
Hybrid slab
MCT roofing
230 mm rat-trap massonry Stone Conc block massonry
Corbelled Pyramid
230 mm solid brick massonry 150 mm ICSMB massonry
FC channel
RCC channel
RCC pink joist
2447
7684
RCC slab
9000 8000 7000 6000 5000 4000 3000 2000 1000 0
Quantities of CO2 emission in kg by of one IAY unit : 66 combinations of Wall + Roof
CSMB massonry 380 mm CRS massonry
Source : Based on APPEP database. 2001
Greening Rural Development in India 59