Nowadays, people talk a lot about energy crisis problem. In fact, demand for energy grows every year while this growing demand is not matched by the growth of the energy source. As the impact, future generation will possibly face energy crisis. In Indonesia, the effort to conserve energy still has not been considered by many parties. Just in these recent years, Greenship certification which is awarded by GBCI (Green Building Council Indonesia) to certified green buildings in Indonesia, started to be recognized by project stakeholders and moreover in short time, Greenship will be one of requierements for applying building permit (IMB) in Surabaya. OTTV (Overall Thermal Transfer Value) calculation is one of criteria in Greenship assessment, where heat transfer through the whole building envelope is minimized to reduce building cooling load. The maximum value of OTTV is 35 W/m2 based on SNI 03-6389-2011. This research is conducted to study whether the OTTV of P1 and P2 of Petra Christian University Surabaya building has met this standard or not. If not, OTTV will be minimized by considering the facade material selection.
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机译：如今，人们经常谈论能源危机问题。实际上，对能源的需求每年都在增长，而这种增长的需求却无法与能源的增长相提并论。作为影响，下一代可能会面临能源危机。在印度尼西亚，许多缔约方仍未考虑节约能源的努力。就在最近几年中，由GBCI（印度尼西亚绿色建筑委员会）授予印度尼西亚认证的绿色建筑的Greenship认证开始受到项目利益相关者的认可，而且在短时间内，Greenship将成为申请建筑许可的要求之一（ IMB）。 OTTV（总热传递值）计算是Greenship评估中的标准之一，该规范将通过整个建筑围护结构的热传递降至最低，以减少建筑物的制冷负荷。根据SNI 03-6389-2011，OTTV的最大值为35 W / m2。本研究旨在研究佩特拉基督教大学泗水大楼P1和P2的OTTV是否满足此标准。否则，将通过考虑外墙材料的选择来最大程度地降低OTTV。
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