[Equest-users] Heat recovery issues

[B. Fountain]

Next, I suspect that the static pressure added by the heat recovery
coils/wheel is overshadowing the heat recovery achieved.

> Hi,
>  
> I have the same situation, My basline is using DX coils with furnace for
> warm up heat and VAV with electric coils for re heat. The addition of a
> dual enthalpy wheel heat recovery system caused the energy consumption to
> increase. I changed the default control to "Mixed Air Reset" and the
> consumption dropped significantly but is still slightly higher than the
> baseline run. Any other thoughts?
>
> Thanks,
> Doy Sanguyu
>
>
> --- On Thu, 5/14/09, B. Fountain <bfountain at greensim.com> wrote:
>
>
> From: B. Fountain <bfountain at greensim.com>
> Subject: Re: [Equest-users] Heat recovery issues
> To: "Grove, Rebecca" <RGrove at ThorntonTomasetti.com>
> Cc: equest-users at lists.onebuilding.org
> Date: Thursday, May 14, 2009, 9:28 AM
>
>
> Note that the eQUEST default control for heat recovery is "Float" which
> maximizes heat recovery at all times.  Consider changing this to "Mixed
> Air Reset" where heat recovery will be modulated, allowing economizer free
> cooling when applicable.
>
>>  I seem to be running into a slight problem getting the heat recovery
>> system to work. Right now I have it set as a sensible wheel with an
>> airflow of 35315 cfm and an efficiency of 60% (all according to the
>> specifications given to me). Unfortunately, using the heat exchanger
>> actually causes my energy consumption to increase. Do you have any idea
>> why this might be happening and what I can do to fix it?
>>
>>
>> Rebecca Grove, LEED AP
>> Senior Engineer
>> Thornton Tomasetti
>> One Audubon Street, Fourth Floor
>> New Haven, CT  06511
>> T 203.672.1390  F 203.672.1391
>> D 203.672.1436
>> RGrove at ThorntonTomasetti.com
>> www.ThorntonTomasetti.com
>>
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