Development of prescriptive method for evaluating energy performance of building envelope
Presently Thai Building Energy Code of the Ministry of Energy requires nine types of buildings with size of 2,000 Sq.m. or more to be compliant. The building envelope performance is determined by using OTTV and RTTV. This needs to be evaluated by using the BEC program. But at present, the building that meet the specific envelope criteria is less than 50%, among all building groups. Therefore, it can be seen that to pass the criteria is still quite difficult. The objective to must study of alternatives in the assessment of energy conservation buildings. From literature review it was found that some regulation and standards provide a prescriptive method option such as ASHRAE 90.1, which is a simple method without computer simulation. Therefore, the purpose of this study is to establish the prescriptive criteria for evaluating the energy performance of building envelopes. The study was conducted by reviewing international and local codes and standards of building envelopes, namely roof and exterior wall. Then the values found were tested with the BEC program to analyze the OTTV and RTTV compliance. It was found that for roof design using insulations with R value ≥ 1.25 (m2oC)/W would be complied with RTTV criteria for both flat roofs and pitched roofs, from the roof ratios of 1:3 to 3:1 in the main direction. It is also possible to have skylight at 3%, which must be designed according to the conditions of each building group. For the exterior wall, to comply with OTTV criteria the prescriptive requirements are to have WWR ≤ 40% in all building types. The mass wall type of lightweight concrete block should have U-value ≤ 1.20 W/(m2oC). As for the wall of brick type, the U-value should have ≤ 1.50 W/(m2oC), but must have a density-specific heat product ≥ 181.92 kJ/m2K. The steel frame wall should have U-value ≤ 0.42 W/(m2oC) and Installed insulation with the R value greater than the standard of no. 5 energy label, can be used on walls of all colors. It must be design the windows according to the conditions of each building group.
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