Thanks for the feedback!
John, I have some contacts at SEMCO and already have placed a
call; we’ll see what results that might produce. It’s helpful to know, though,
that it’s a work in progress.
Chris, Part of the reason for asking whether anyone has “attempted
to precisely simulate the controls” is that I thought I might model the
passive dehumidification wheel by using a “HeatExchanger:AirToAir:SensibleandLatent”
object and just zero the sensible effectiveness. This is very simplistic, but I
thought it would get me most of the way toward the actual performance.
I should qualify by saying that, while I have essentially
duplicated the SEMCO “total enthalpy” wheel’s performance and energy use in a
spreadsheet (because I like to that sort of thing and a client wanted more info
than SEMCO’s own spreadsheets would provide), I haven’t got the same level of knowledge
about their Pinnacle wheel. It seems, though, that its principal purpose is to
just remove moisture�..
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of John
Sent: Thursday, June 10, 2010 8:29 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Double wheel energy Recovery
To cjm23113 and Jim,
If you contact your local rep. Send the input criteria required to them
and the equation requirements, they would probably help you. Several
senior people at Semco are working with the different energy modeling software
developers, (Trane, HAP, eQuest, Eplus is on the list) to develop
algorithyms so the Pinnacle and EP units can be modeled. The one
with HAP is complete. They recognize this is a problem. I don't
know if they can accomplish this in the time you need, but provided them all
the input info required and engineering references might help speed the
response up, so they are not looking at the info "blind".
John
From: cjm23113 <cjm23113@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thu, June 10, 2010 6:25:54 PM
Subject: [EnergyPlus_Support] Re: Double wheel energy Recovery
Jim,
I have actually encountered these same questions trying to model the Semco
Pinnacle myself. I have modeled the system and managed to get it to run using
Dehumidifier:Desiccant:System and HeatExchanger:Desiccant:BalancedFlow. The
problem with this solution is that HeatExchanger:Desiccant:BalancedFlow
requires a HeatExchanger:Desiccant:BalancedFlow:PerformanceDataType1. This
performance curve has 51 fields (16 of which are equation coefficients) and
only two examples in PerfCurves.idf (neither of which seem remotely close to
the Semco Pinnacle - they are for systems with reactivation heaters). I would
imagine that it would be nearly impossible to get any manufacturer to give you
enough information to create this performance curve yourself. I'd like to talk
more about this offline if you are interested.
Does anyone else have any input? I think that passive desiccant wheels will
only become more prevalent with time and I would love to see them get
accurately modeled sooner rather than later.
Chris
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx,
"jvd2pe" <jvd2pe@...> wrote:
>
> Dear E+ forum,
>
> I've been asked to model a double wheel energy recovery unit, similar to a
Semco Pinnacle. I have two questions for you:
> 1) The general idea seems reasonably straightforward, but I have only
modeled a single wheel style previously, and wonder if there are any surprises
or special approaches that must be used for a double wheel.
> 2) The controls for these units are rather sophisticated to minimize
energy use and prevent freezing or condensation in the wheel. Has anyone
attempted to precisely simulate the controls for something like a Pinnacle?
Care to share tips?
>
> p.s., If, after feedback and further study, I am not confident that I can
properly create the model, I will tell my client that they should look for
another modeler who is more talented than I in this particular area. Would any
of you like a call? If so, please let me know via private communication.
(jim@...)
>
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