Implications For Energy Consumption

Question 1

What the maximum OTTV should be for HK?

Answer 1

Depends on some factors
Prevailing climatic conditions
Likely energy savings
Implications to the design and construction process

Question 2

What is the most significant heat gain from the three components?

Answer 2

Solar radiation through windows

Question 3

Variables controlling solar heat gain

Answer 3

Window-to-wall ratio

Shading effects

Question 4

WWR for commercial buildings

Answer 4

35 to 65% average 47

Question 5

WWR proposed to keep balance with limiting heat gain and external views/ natural light

Answer 5

44%

Question 6

Skylight to roof ratio

Answer 6

15%

Question 7

Types of used in commercial buildings

Answer 7

Clear, tinted and reflected

Question 8

Shading coefficient comercial buildings

Answer 8

0.2-0.4

Question 9

Tinted glass shading coefficient

Answer 9

0.5 to 0.7

Question 10

U-value window wall

Answer 10

6 W/m2K

Question 11

U value opaque wall

Answer 11

2.5 W/m2K

Question 12

Shadding coefficient wall

Answer 12

0.35

Question 13

WWR wall

Answer 13

44%

Question 14

Opaque roof U value

Answer 14

0.6 W/m2K

Question 15

Skylight U value

Answer 15

6 W/m2K

Question 16

Skylight shading coefficient

Answer 16

0.35

Question 17

SSR

Answer 17

15%

Question 18

How much percentage represents the cooling requirement from the total cooling load

Answer 18

25%

Question 19

Key areas to address to achieve energy savings

Answer 19

Building envelope, building services and building operation and maintenance

Question 20

What kind of residential building is exempted from RTTV

Answer 20

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

Question 21

ORTTV of external walls and roofs should not exceed…

Answer 21

14 W/m2 and 4W/m2 respectively