12/1/2023 0 Comments Ashrae 90.1 plug loadsAn elementary school will be about 15%, an office 25%, a high rise office may be greater due to elevator use, add a restaurant to an office building and the percentage increases, etc. What is most important is that you model the process loads (items that impact energy use but are not regulated by 90.1) as accurately as possible. If you were over 25% then you were usually OK, if under 25% you had to provide an explanation as to why you were under. It was/is used as a guideline in reviews. It was based on energy use data that showed that the typical office building's plug load was about 25% of the total energy use. The 25% is a remnant left over when LEED was originally written around an office building. Under v4 this part of the credit language was removed. The credit language was poorly written so it sounded that way but it was never the intent. The 25% minimum for process loads was never a requirement in LEED.
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