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CS-v4 EAp2:Minimum energy performance

How the fan efficiency W/cfm and pump efficiency W/gpm is decided in Ashrae 90.1?

Where or which book we can find about how the fan efficiency W/cfm and pump efficiency W/gpm is decided in Ashrae 90.1 just like what type building or how large build is considered and how long duct or pipe is considered?

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Marcus Sheffer
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7group / Energy Opportunities
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Wed, 04/25/2018 - 20:10

The book is ASHRAE 90.1-2010. In the Proposed model these values would be the same as the design. In the baseline this is fully explained in ASHRAE 90.1-2010, Appendix G. Your question is very broad and difficult to answer. Perhaps you could be more specific?

Thu, 04/26/2018 - 08:57

Thank you, marcus. Sorry for confusing you. It is a bit hard to me to exactly express my meaning using English. Now let me put an example, assuming we have a 20 floors building, 100 meter tall. the building`s chilled pump power is 3 times than base case chiller pump power. So I think if the base case pump efficiency 22w/gpm is suitable for such a higher building, because greater head is needed. So what type building should the base case pump efficiency based on?  The same question can be put on fan efficiency.

Fri, 05/04/2018 - 14:05

It appears you are trying to "design" the Baseline building. Appendix G defines the Baseline pump power in W/gpm and fan power in Watts independently from the building size or height. So the flow rates should be auto-calculated based on the loads and temperature difference of the water/air, and the pump/fan power should be directly input based on these flow rates. There should not be a need for inputs for head/static or efficiency in the Baseline model.

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