[Equest-users] Baseline HVAC Single Zone Furnace Operation.

[Carol Gardner]

Sorry I accidentally hit the send button.

I was saying, my take on modeling systems that Appendix G and the rest of
Standard 90 don't supply specific requirements for is to make them
reasonably inefficient. I say reasonably because it has to be within reason,
so that you can't be accused of gaming the system. In this case you have
further justification for using the modulating baseline as you truly don't
have any information about staging,

Cheers,

Carol

On Wed, Mar 30, 2011 at 5:53 PM, Carol Gardner <cmg750 at gmail.com> wrote:

> Hi Kathryn,
>
> Thanks for sharing your solution to the Georgia project. It sounds like a
> really good idea, simple yet effective. It's funny I don't think I would
> have thought of using 2 DOAS units, but why not?
>
> WRT to the furnace. My ta
>
> On Wed, Mar 30, 2011 at 1:59 PM, Kathryn Kerns <
> kathryn.kerns at bceengineers.com> wrote:
>
>>  Everyone, I may have asked this before, but has anybody run across a
>> section of ASHRAE 90.1 or LEED describing the operation of a baseline
>> furnace in a PSZ unit? Do we assume the heating modulates or does it stage?
>> And if it stages, how many stages? I have been modeling baseline furnace
>> heating as modulating since that is what naturally appears in eQuest, but I
>> wonder. I know in reality that a lot of small furnace heaters cycle to
>> maintain space heat.
>>
>>
>>
>> Also, I promised I would share results of my struggle to model
>> dehumidification for a project in Georgia. I was sort of successful, I
>> think. What I ended up doing was attaching 2 DOAS in series. The first DOAS
>> had a cooling only heat pump and the second unit had heating only heat pump.
>> The first unit handled the outside air and passed space/return air to the
>> second DOAS.  The second unit supplied space/return air to the terminal
>> units. This way I got to define set points for the first DOAS cooling supply
>> temperature (space/return temperature) and the second DOAS heating supply
>> (space/return temperature). The amount of energy consumed and size of each
>> unit was adjusted to approximate a horseshoe dehumidification unit. It
>> seemed to work.
>>
>>
>>
>>
>>
>>
>>
>> *Kathryn Kerns*
>>
>> *Systems Specialist*
>>
>> *BCE** Engineers, Inc.*
>>
>> *| Ph: 253.922.0446 | Fx: 253.922.0896 |*
>>
>>
>>
>>
>>
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>
>
> --
> Carol Gardner PE
>



-- 
Carol Gardner PE
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