simulation-based assessment of energy and environmental performance of office buildings in lebanon...
TRANSCRIPT
Simulation-based assessment of energy and environmental
performance of office buildings in Lebanon
Z. Alameddine, K. Orehounig, A. Mahdavi,
Department of Building Physics and Building EcologyVienna University of Technology, Vienna, Austria
Introduction
Lebanon has a moderate Mediterranean Climate . In coastal areas, winters are generally cool and rainy whilst summers are warm. Lebanon has no fossil fuel resources. 98% of all energy needs are met with imports of petroleum products.
Method
Method
Scenarios
Insulation
Glazing
Shading
Lighting
Ventilation
Mass
1 Ib Gb S0 L1 V1 Mb
2 Ib Gb S0 L2 V1 Mb
3 Ib Gb S0 L1 V2 Mb
4 Ib Gb S0 L1 V3 Mb
5 Ib Gb Si,a L1 V1 Mb
6 Ib Gb Se,a L1 V1 Mb
7 Ib Gb Sf L1 V1 Mb
8 I7 Gb S0 L1 V1 Mb
9 Ib Gb S0 L1 V1 Mnc
10 Ib G0,22 S0 L1 V1 Mb
11 Ib G0,14 S0 L1 V1 Mb
12 I7 Gb S0 L1 V3 Mb
13 Ib Gb S0 L1 V3 Mnc
14 Ib Gb Si,a L1 V1 Mb
15 Ib Gb Se,a L3 V1 Mb
16 Ib Gb Se,a L3 V2 Mb
17 Ib Gb Se,a L3 V3 Mb
18 Ib Gb Se,a L3 V4 Mb
Parameters Base Case Modified Case
Insulation 1,6…3,2 0,4…0,5( with Insulation)Glazing 2,8…5,7 1,7Shading types
No shades
Internal External Fixed
Shading schedules -
Dynamic Fixed
Lighting - Efficient LightingVentilation - Night time ventilation
Method
Heating load (kWh.m-2.a-1)
External Insulation
External shading
External shading and high night-time ventilation
Selected Results
Latent cooling load (kWh.m-2.a-1)
Sensible cooling load (kWh.m-2.a-1)
Externalinsulation
Better glazing
External insulation and ventilation
External shading ,high night-time ventilation and daylight
Night ventilation
Selected Results
Sensible cooling load reduction (in percentage of the base case)
Night ventilation
External shading
External insulation
Better glazing
Combinations
Internal mass and night-time ventilation
Selected Results
Mean overheating (see Table 11 for assumptions regarding θr)
Mean overheating (θr=26oC)
Externalinsulation
Better glazing
External insulation and ventilation
External shading ,high night-time ventilation and daylight
Night ventilation
Selected Results
Mean overheating reduction (in percentage of the base case) for θ r=26oC
Night ventilation
External shading
External insulation
Better glazing
Combinations
Internal mass and night-time ventilation
Selected Results
Heating Loads are minimal and can be eliminated by implementing some measures like external insulations , better glazing.
Latent cooling load variations in different scenarios are rather small (4-6 kWh.m-2 .a-1); increase is due to higher ventilations input.
Sensible cooling loads are significant.
60% Less Cooling loads can be achieved by combining external shading, high night time ventilations ,efficient lightings, and using daylight.
Overheating reduction potential is likewise substantial and can reach up to 68% .
Conclusion
Thank you
Z. Alameddine, K. Orehounig, A. Mahdavi,
Department of Building Physics and Building EcologyVienna University of Technology, Vienna, Austria