TP_Tech_guide_27jul05 - Republic of Lebanon Ministry of...

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Republic of Lebanon Ministry of Public Works and Transport General Directorate of Urban Planning United Nations Development Programme Global Environment Facility TECHNICAL GUIDE For the application of The Thermal Standard For Buildings in Lebanon Copyright © UNDP/GEF and MPWT/DGU – 2005 Reproduction is authorized provided the source is acknowledged and provided the reproduction is not sold. The United Nations Development Programme, the Global Environment Facility and the Ministry of Public Works and Transport are not responsible for the use which may be made of the information contained within.
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Non-edited version Technical Guide for the Application of the Thermal Standard for Buildings in Lebanon :: i :: FOREWORD Over the years, the improvement of the thermal performance of building envelopes has become a standard practice and the subject of regulations in most countries. In Lebanon, the application of regulatory measures without prior planning would lead to a disruption of the building construction sector, which would undermine the effectiveness of such measures. The key to achieving long-term success will be to take into account the reaction time of each building construction trade and to provide the means to adapt to changes in construction methods. The proposed voluntary thermal standard and the present Guide are consistent with this approach. The general philosophy is to propose sound construction practices and conditions for promoting thermal comfort. In the thermal standard, the recommended insulation levels were developed by comparing the incremental construction for envelope improvement and the expected savings over the life cycle of the building components. Optimum levels were determined by simulating the energy consumption of a typical building with several building envelope improvements, and finally by conducting an economic analysis in each climatic zone in Lebanon. The Thermal Standard provides a choice between two compliance paths: the prescriptive path and the performance path. The aim of having more than one path is to allow greater compliance flexibility. The prescriptive path is based on the use of equations and tabulated reference values, and involves the demonstration of compliance with two separate requirements: the first is the thermal transmittance value and the second is the effective fenestration ratio. The performance path is based on the simulation of the annual heating and cooling energy requirements, and involves the demonstration that the annual heating and cooling energy requirements of the proposed building are less than or equal to those of a similar hypothetical reference building which meets the prescriptive path. Guidelines presenting practical approaches to achieve the prescriptive performance requirements mentioned in Section 6 of the thermal standard are provided herewith.
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