Implications For Energy Consumption Flashcards
(21 cards)
What the maximum OTTV should be for HK?
Depends on some factors
Prevailing climatic conditions
Likely energy savings
Implications to the design and construction process
What is the most significant heat gain from the three components?
Solar radiation through windows
Variables controlling solar heat gain
Window-to-wall ratio
Shading effects
WWR for commercial buildings
35 to 65% average 47
WWR proposed to keep balance with limiting heat gain and external views/ natural light
44%
Skylight to roof ratio
15%
Types of used in commercial buildings
Clear, tinted and reflected
Shading coefficient comercial buildings
0.2-0.4
Tinted glass shading coefficient
0.5 to 0.7
U-value window wall
6 W/m2K
U value opaque wall
2.5 W/m2K
Shadding coefficient wall
0.35
WWR wall
44%
Opaque roof U value
0.6 W/m2K
Skylight U value
6 W/m2K
Skylight shading coefficient
0.35
SSR
15%
How much percentage represents the cooling requirement from the total cooling load
25%
Key areas to address to achieve energy savings
Building envelope, building services and building operation and maintenance
What kind of residential building is exempted from RTTV
Domestic accomodation in a building in which the only domestic part is a place of residence, having not more than 50m2 of usable floor space for persnons employed in connection with the building
ORTTV of external walls and roofs should not exceed…
14 W/m2 and 4W/m2 respectively
