Dear all,
According to the Table G3.1.3.7 of the ASHRAE90.1, the number and type of chillers could be determined. But I encountered a project of a industry factory, in which the industry process need a lot of cooling. I notice the Table G3.1.3.7 is for "Building Peak Cooling Load", I take it as the industry cooling will not be included in the Building Peak Cooling Load, is it correct? If so, is there any efficiency, number or type requirement of the industry chiller? Can I exclude the industry cooling energy in the building energy simulation?
Thanks!
Chiller number and size of the ASHRAE 90.1
Dec 12, 2011
If it is only used to cool the process, and not cool the space that the
process is in (ie a data rack room that has a cooling system) then you
should use the as designed efficiency. You may want to separate the
pumping energy, if any, as well by creating a second chilled water loop.
If you are cooling a space that happens to have a high heat load due to
the functioning equipment, you may be able to take credit for an efficient
design. Its a dance that for LEED may need to be very carefully thought
out.
Hope this helps, and I hope others agree with me.
2011/12/12 Esmireta
--
Rob Hudson
Esmireta,
Chilled water used for a manufacturing process would be considered a process
load, which you'd have to model identically in both baseline and proposed
cases [Table G3.1(12)(baseline)]. Exception: Your baseline model only has
to use minimum efficient chillers (of the same type as the proposed design)
as shown in Table 6.8.1. For example, if your proposed case has a highly
efficient screw chiller, then your base case need only include a screw
chiller with 90.1 minimum efficiency.
Any process load savings have to be reported as an ECM for LEED purposes.
If the project team is claiming that the proposed manufacturing process is
"more efficient" than industry practice, then the burden of proof is on the
project team to provide documentation that describes current industry
"standard practice," and how the proposed design exceeds those standards.
Anthony Hardman, PE, LEED AP BD&C