Lecture-2-Thermal_tsandard_for_buildings_in_Lebanon_Compatibility_Mode_

Lecture-2-Thermal_tsandard_for_buildings_in_Lebanon_Compatibility_Mode_

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1 Building Envelop and Lebanese Buildings Project Capacity Building for the Adoption and A li i f Th l S d d f B ildi Thermal Standard Application of Thermal Standards for Buildings Republic of Lebanon . Ministry of Public Works & Transport . General Directorate of Urban Planning United Nations Development Programme Global Environment Facility What Does the Thermal Standard Specify? y Sets the minimum requirements for the thermal performance of building envelopes y Provides methods for determining compliance with these requirements 2 Building Envelope Mechanical Systems Service Water Heating Lighting Systems
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2 Why follow a thermal standard for building envelop? What results can be achieved with the standard? 3 Purpose ¾ To improve the thermal performance of building envelopes ¾ To improve the thermal comfort conditions within buildings ¾ To reduce the energy needed for space heating and cooling ¾ To reduce environmental impacts T i h i ii f 4 ¾ To improve the economic position of country
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3 Scope Residential Buildings (Category 1) y Multi-storey residential buildings and Non-Residential Buildings (Category 2) y Commercial (restaurants, offices, cinemas, complexes y Detached single and multi-storey residences y Secondary seasonal residences and chalets, y Dormitories y Etc. services, etc.) y Hospitality (hotels, motels, etc.) y Education and children services y Health care (hospitals, nursing homes, etc.) y Institutional (government services, jails, police stations, etc.) y Retail (stores, shopping malls, etc.) y Warehouses (applicable to heated and/or ld 5 cooled areas) y Industrial (office areas of buildings) y Sports facilities (when they are heated and cooled during occupancy) Terminology: Thermal Transmittance Through Walls T e T i h e h i λ 6 x = 0 x = t q” λ : Thermal conductivity of the wall
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4 Heat Loss/Gain through walls () 11 ei TT qx t ′′ = ⎡⎤ Thermal Driving Potential Overall Thermal Resistance = hh λ ++ ⎢⎥ ⎣⎦ 1 A A QU AT R = = + + & 7 t • U: Wall Thermal Conductance (W/m 2 K) • R: Thermal resistance (m 2 K/W). Total Energy Usage vs. Wall U factor Total Energy Usage vs Wall U factor Residential Buildings 1200 600 800 1000 otal Energy (GJ) 8 0 200 400 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 U factor (W/m2.C) To
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5 Review of Terms U-value (U) : measure of heat gain or loss due to temperature differential (W/m 2 -deg. C); 21C indoor, -18 C outdoor High Performance Glazing Shading coefficient (SC) : Ratio of solar heat gain relative to a sheet of clear single pane single strength glass (SHGC x 0.87) Solar heat gain coefficient (SHGC) : Portion of directly transmitted and absorbed solar energy that enters the building’s interior, relative to incident radiation striking outside of window Visible transmittance (V) : Percentage of visible light that is transmitted through the glass.
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Lecture-2-Thermal_tsandard_for_buildings_in_Lebanon_Compatibility_Mode_

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