[Bldg-sim] PTAC and PTHP EER, fan energy

[Loren Appin]

Could anyone else comment on this?  I had asked this question a couple of
months ago, and through some research and guidance received the answer that:

The EER does include the fan power, which you would calculate from Table
6.8.1.D and you would calculate this for each system based upon it's
auto-sized capacity; thus, you will use a different EER for each system.

An important clause to then look at is G3.1.2.1 which states that equipment
efficiencies must be broken down into their component parts, such as the EER
into EIR and fan power.  One way of doing this is to parse it out using
equest, capturing the correct EIR and then plugging that back in with a
separate fan power.

To get the fan power you would use Table G3.1.2.9 to get BHP and calculate
the fan power from this.

All of this, though, is according to ASHRAE 2004, I have not been using the
2007 Addendum.  I just wanted to see if this is what everyone else has been
doing?

Thanks

* Loren Appin*

Energy Engineer

* Silpa Inc.*
* s* i m p l e  .  *s* c i e n t i f i c  .  *s* u s t a i n a b l e
AMERICAS | ASIA
www.silpainc.com



On Thu, Apr 17, 2008 at 7:26 PM, Michael Rosenberg <
Michael.Rosenberg at state.or.us> wrote:

> The EER does include the fan power. The baseline fan power allowance in
> Appendix G from 90.1 2004 was recognized as being much too high for PTACs
> and PTHPs. An addendum was issued lowering the value to 0.3 W/cfm. This is
> captured in the new 2007 version of 90.1 Appendix G.
>
> Michael Rosenberg
> Oregon Department of Energy
> 625 Marion St. N.E.
> Salem, OR 97301-3742
> Phone : (503) 373-7809
> Fax: (503) 373-7806
>
> >>> "Xu, Xiaowei" <xiaowei.xu at ny.fk.com> 4/17/2008 8:10:25 AM >>>
> Hi,
>
> I have a quick question about the EER requirement for the PTAC and PTHP
> system. In Standard 2004, Table 6.8.1D gives out the minimum requirement
> for the PTAC and PTHP system. My question is does this EER include the
> fan power or not?
>
>
>
> Also for the PTAC and PTHP system, following the Appendix G fan power
> energy calculation, the fan power would be about 0.7~0.8W/cfm. However
> the manufacture's catalog data usually gives out the value around
> 0.2~0.3W/cfm, which means the proposed case would get a lot of fan
> energy savings. Does this make sense? Thanks a lot.
>
>
>
>
>
> Xiaowei Xu
>
> Engineer
>
>  FLACK + KURTZ
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-- 
Loren Appin | loren.appin at gmail.com
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