<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Hello all,<br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><div><br>In life cycle analysis of buildings, it seems it is very hard to estimate long-term performance of HVAC systems (or other building components), for example, air handling units, chiller, or boilers. It makes sense that HVAC system will degrade with time, depending on many factors, like maintainence, wear-and-tear. The problem is how to quantify these change with time. Maybe some probabilstic or scenario methods can be used. Would you please tell me the common method to predict these performance change or where I can find
some good references about this topic?<br><br>Thanks,<br><br>Jim Terrry <em></em><br></div>
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