Life Cycle Analysis questions

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Jeanne Anton, CSI, CDT, LEED AP BD+C

November 20, 2024 22:33

Can someone explain why Replacement costs is incorrect on the first question and correct on the second question? I knew property value was incorrect on the second question but since that first question said replacement cost was wrong I purposely didn’t choose it and i ended up getting it wrong any way.  Just curious if I am missing something.

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  abruno168 November 21, 2024 14:20

  In the first question, the cost analysis is on the life cycle of a single generator. The analysis is of the single item and does not include what the replacement would be, rather how well that isolated system/generator will perform as long as it is in use.

  The second question is an analysis of the entire building. Systems will fail or end up not working at some point in the building's life cycle, therefore they will end up having to be replaced or changed at some stage down the line.

  The difference between the questions is a matter of scale: the first focuses on a single entity of a system and how that performs on its own during its expected life cycle; the second focuses on how systems collectively will work in the building during a time period and what total cost(s) would be, including the replacement/repair to overall systems within that time.

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  Jeanne Anton, CSI, CDT, LEED AP BD+C November 22, 2024 00:03

  thanks Anthony!! this one really tripped me up. You explained it extremely well and I will look out for the scale if I run into this sort of question again.

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