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Re: [EnergyPlus_Support] Equipment Capacity Problem





Hi Mr. Raustad,
Thanks for your feedback. I understand the fact that each parameter of GSHP (parameter estimation model) is critical to define a correct system. However, up to now i cannot find such a detailed equipment specification to reflect my own equipment in Energy Plus model. Is there any general source to find similar parameters? Energy Plus input requirements are  very unique.

Omer T. Karaguzel PhD Candidate
Center for Building Performance & Diagnostics (CBPD)
Carnegie Mellon University
Pittsburgh U.S.A.

--- On Mon, 7/12/10, Richard Raustad <RRaustad@xxxxxxxxxxxx> wrote:

From: Richard Raustad <RRaustad@xxxxxxxxxxxx>
Subject: Re: [EnergyPlus_Support] Equipment Capacity Problem
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Monday, July 12, 2010, 2:48 PM

The example files are meant to help you understand the specific object
requirements for assembling and using that object in E+. In most cases,
the example files represent "good practice" design. However, there are
still some example files that simply show the input requirements and
connection scheme. You are correct, the AC system is over-sized. I also
recall that it is critical that the inputs to the parameter estimate
model be correct for a given size AC and GLHE. So be careful to
correctly size this system's components when changing inputs to this model.

O. Tugrul Karaguzel wrote:
>
> Hi guys,
> I was analyzing energy Plus sample model (named as GSHP-GLHE.idf) for
> Ground Source Heat Pumps, and I realized that this model has
> HeatPump:WaterToWater:Parameter:Estimation:Heating and Cooling
> equipments with nominal capacities of 50,000 and 45,000 W,
> respectively. I also checked sample building's design heating and
> cooling loads which were about 14,000 and 16,000 W respectively (these
> are loads calculated using a sizing factor of 1.2).
> How come does a GSHP equipment have a nominal capacity which about 3.5
> times greater than design heating load of a building? Isn't this
> equipment significantly over-sized? or is there any other explanation
> for such a relationship between loads and system capacities?
> Thanks.
> Omer T. Karaguzel PhD Candidate
> Center for Building Performance & Diagnostics (CBPD)
> Carnegie Mellon University
> Pittsburgh U.S.A.
>
>
>

--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

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