[Equest-users] Solar Thermal Energy Assisted Cooling

Fri Jun 12 15:58:07 PDT 2020

I don't think you're going to find a library curve for this sort of compressor... Unless I'm missing some new feature, you are likely looking at some post-processing to handle this case.

An eQuest model could be used to develop and inform the work to be done by the system (custom hourly report - export an 8760 profile for heat moved by the system each hr... and solar radiation info from the GLOBAL variables as well while you're in there), then use the resulting HSR/CSV output alongside your manf's performance data to work out the projected performance/energy required each interval.

~Nick

[cid:image001.jpg at 01D640E3.045BB080]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Energy and Sustainability Services
  Energy Performance Contracting
D
M
E

913 . 564 . 6361
785 . 410 . 3317
nicholas.caton at se.com<mailto:nicholas.caton at se.com>
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219

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From: Damon Lapping <damon at greenlogik.co.za>
Sent: Friday, June 12, 2020 12:17 PM
To: Nicholas Caton <Nicholas.Caton at se.com>
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Solar Thermal Energy Assisted Cooling

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________________________________

Hi Nick,

Not solar powered but rather using thermal energy to assist the compressor in the vapour compression cycle.

Regards

DAMON LAPPING, CEM(r), CRM(r)
Managing Consultant
damon at greenlogik.co.za<mailto:damon at greenlogik.co.za>
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From: Nicholas Caton <Nicholas.Caton at se.com<mailto:Nicholas.Caton at se.com>>
Sent: Friday, 12 June 2020 6:41 PM
To: Damon Lapping <damon at greenlogik.co.za<mailto:damon at greenlogik.co.za>>
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: RE: [Equest-users] Solar Thermal Energy Assisted Cooling

Hi Damon,

So... a solar-powered refrigerant compressor?

I suppose you could model a small PV array to generate an appropriate kW output profile within eQuest, then just dump that into the building meter with a normal DX-system.  You'll want that airside system to have some deliberately-assigned availability scheduling so that it cannot actively cool when there is insufficient daylight... but otherwise I think you'd define that system normally.  The biggest potential hurdle with that approach might be extrapolating the actual efficiency/performance of the equipment (sans solar contributions) from the manufacturer.

I might sooner use a 3rd party software, purpose built for estimating PV system performance, over eQuest though... eQuest is capable but frankly a bit unwieldy for average joes like me, lacking specialized and deep knowledge of PV technology.  I would avoid it through post-processing if possible, but if you do go a 3rd party PV analysis route and you MUST get that generation into your eQuest model, you can use the library entries for a PV generator alongside an electric sale meter to "back in" a generation profile aligning with your outside analysis.

I hope this is helpful!

~Nick

[cid:image006.jpg at 01D640E3.045BB080]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Energy and Sustainability Services
  Energy Performance Contracting
D
M
E

913 . 564 . 6361
785 . 410 . 3317
nicholas.caton at se.com<mailto:nicholas.caton at se.com>
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
[cid:image004.png at 01D640E3.045BB080]

From: Equest-users <equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>> On Behalf Of Damon Lapping via Equest-users
Sent: Friday, June 5, 2020 5:47 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Solar Thermal Energy Assisted Cooling

[External email: Use caution with links and attachments]

________________________________

Good Day,

Does anyone have experience in modelling solar thermal energy assisted cooling for HVAC? These systems use thermal energy collected from the solar collector and is converted into mechanical work, which is used then used to compress the working fluid in a vapor compression cycle directly. So the HVAC system achieves the required setpoint temperature with less energy required from the compressor than previously required.

I have heard on some online platform that it can be done in equest but can't seem to find that link anymore.

Can anyone help a brother out? :-)

Thanks

Regards

Damon

Regards

DAMON LAPPING, CEM(r)
Managing Consultant
damon at greenlogik.co.za<mailto:damon at greenlogik.co.za>
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T.    +27 (0) 87 470 0650    F.   +27 (0) 86 763 1323
C.   +27 82 339 3865
[cid:image005.jpg at 01D640E3.045BB080]
UNIDO Certified Energy Management Professional
AEE CEM (Association of Energy Engineers Certified Energy Manager)
SA Green Building Council Existing Building Performance Accredited
Professional

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