[Equest-users] Flat Performance Curve

[Jason Glazer]

Brian,

I don't think the intention of that language it to require 
the use of the full load efficiency at part load. Instead, I 
would interpret it to mean that for equipment that is rated 
at both full load conditions and at part load conditions, 
both values should be used at the appropriate loading. For 
example, many chillers have requirements for both COP and IPLV.

Jason

On 8/2/2011 1:26 PM, Brian Tysoe wrote:
> Hello,
>
> For a ASHRAE 90.1 Energy Cost Budget model, 11.3.2.b says
> the following:
>
> “All HVAC and service water heating equipment in the /budget
> building/ shall be modeled at the minimum /efficiency/
> levels, both part load and full load, in accordance with 6.4
> and 7.4.”
>
> Should I interpret this to mean the efficiency is constant
> with respect to part load ratio? Therefore, a hot water
> boiler <300,000 Btu/h should have an efficiency of 80% at
> all operating points (Table 6.8.1F)? How do I enter a flat
> performance curve for a boiler in eQUEST?
>
> Thanks,
>
> *Brian Tysoe *M.A.Sc., P.Eng., LEED AP
>
> /Mechanical Engineer /
>
> */MCW Consultants Ltd. /* <http://www.mcw.com>
>
> /600-156 Front Street West
> Toronto, ON M5J 2L6
> Phone 416-598-2920
> Fax 416-598-5394 /
>
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-- 
Jason Glazer, P.E., GARD Analytics, 90.1 ECB chair
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