[Equest-users] Modeling solar thermal on a campus system

[Steve Mignogna]

I agree with Karen---you will need to change the temperature of the HW
loop.  however, you may need two seperate HW loops if they require different
temperatures.  there are two different ways you can go about modeling the
SHW system.  Either your SHW meets all the HW load, in which case you can
model a dummy boiler, that generates HW but does not use any energy. or you
can use retscreen to figure out how much energy the SHW system will save on
heating and then subtract that out from your results.

--

steve



On Fri, Oct 24, 2008 at 3:18 PM, Karen Walkerman <kwalkerman at gmail.com>wrote:

> no, but you can change the temperature of the hot water loop in the
> detailed edit mode.  I have done this to simulate low temperature water
> systems and then used another program (such as RetScreen) to evaluate solar
> hot water output.  Unfortunately, I know of no way to directly integrate the
> two.  The problem arises that often when the sun is shining enough to
> produce heat through the SHW system, the building does not need much heat.
> A thermal storage tank can help mitigate this issue, but brings its own
> challenges.
>
> I am surprised, however to learn that baseboard heat will be the method of
> delivery.  I am familiar with using SHW to supplement radiant panels, and
> low-temperature water coils, but not baseboards.
>
> Good luck!
>
> --
> Karen
>
> On Fri, Oct 24, 2008 at 2:01 PM, Aulbach, John <jaulbach at nexant.com>wrote:
>
>>  Can't do solar hot water in eQuest. Bummer !!
>>
>>  ------------------------------
>> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Kot, Douglas
>> *Sent:* Friday, October 24, 2008 10:56 AM
>> *To:* equest-users at lists.onebuilding.org
>> *Cc:* Sanchez, Jorge J.
>> *Subject:* [Equest-users] Modeling solar thermal on a campus system
>>
>>  All,
>>
>>
>>
>> We are working on an eQuest model for a high rise residential building
>> (part of a campus hot water loop) that uses a solar thermal system for
>> both space heating and domestic hot water . The proposed space heating
>> system is baseboard radiant heating.
>>
>>
>>
>> So far our approach to modeling this is to change the inlet water
>> temperature to the water heater to match the supply temperature coming out
>> of the solar system.  That only addresses the domestic hot water, not the
>> space heating. We can't find the way to change the inlet temperature to
>> the baseboard system, but we believe that there's probably a way of doing
>> it.
>>
>>
>>
>> Does anyone have any advice on how to accomplish this? Any tips on
>> modeling solar thermal in eQuest (or otherwise) are welcome and greatly
>> appreciated!
>>
>>
>>
>> Thanks in advance!
>>
>>
>>
>> Best Regards,
>>
>> *Douglas Kot, AIA*
>> LEED(R) AP
>> Sustainable Design Consultant
>>
>> *KEMA Services Inc.*
>> 3605 5th Avenue, Suite A
>> San Diego, CA 92103
>> Office +1 619 688 0960 x 15515
>> Mobile +1 619 246 1858
>>
>> douglas.kot at kema.com
>> www.kemagreen.com
>>
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>>
>>
>>
>>
>>
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>
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-- 
Steve Mignogna
Atelier Ten
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