08. ] energy system & u-value.

Therefore, it is effective in insulating the building from the sun and in minimizing heat gain in the house louvres.

UBBL clause 38A

Energy Efficiency in Buildings

(2) Roof for all buildings shall not have a thermal transmittance (U-value) greater than: -

(a) 0 4/m²K for light (under 50kg/m²) weight roof

(b) 0 6/m²K for heavy (above 50kg/m²) weight roof, unless provided with other shading and cooling means

Therefore it is effective in insulating the building from the sun and in minimizing heat gain in the house external surface paint concrete tile roofing [25mm] air cavity sisalation [4mm] plasterboard ceiling [13mm] interior surface paint external paint external cement plaster brickwork [115mm] internal paint internal cement plaster [15mm]

Wall complies to UBBL

Overall Thermal Transfer Value (OTTV) is a measure of average heat gain into a building through the building envelope

= Heat Conduction Through Walls + Through Windows +

Solar Heat Gain Through Windows

= 15a(1-WWR)Uw + 6(WWR)Uf + (194 x CF x WWR x SC)

= 15(0.25)(1-0.55)(2.110) + 6(0.55)(4.5) + (194 x 0.90 x 0.55 x 0.5)

= 3.560625 + 14.85 + 48.015

= 66.426 W/m²

The OTTV Value more than 50W/m², causing Bedroom 1 to have higher temperature

Average wastage per week produced by 4 occupants of the house food waste plastics paper / cardboard