Re: [EnergyPlus_Support] Modelling Air Colled Chiller: Obtaining Performance Curves and Coefficients

["Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

It has occurred to me that, since E+ maintains a constant chilled water leaving temperature, it may be OK to use a limited data set for creation of curves (i.e., single temperature = the setpoint (IF your setpoint is constant)

On the other hand, it's fairly common:

• to vary the setpoint based on load or outdoor temperature
• for manufacturers to provide performance data at varying chilled water leaving temperatures

On Wed, Jan 24, 2018 at 3:46 PM, Philip Kennedy philip.kennedy@xxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 

Send me the data and I will evaluate.

Regards Philip

Philip Kennedy

Continual Energy Inc

Ph: 647-643-7786

Cell: 647-823-6599

Email: Philip.kennedy@xxxxxxxxxxxxx

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From: EnergyPlus_Support@yahoogroups.com <EnergyPlus_Support@yahoogroups.com> on behalf of lrebello1@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@yahoogroups.com>
Sent: Wednesday, January 24, 2018 1:52:37 PM
To: EnergyPlus_Support@yahoogroups.com
Subject: [EnergyPlus_Support] Modelling Air Colled Chiller: Obtaining Performance Curves and Coefficients

 

 

Hello all,

I have tryed to model an Air Colled Chiller using Curve Fit Tool but I could not. Now I am trying to use Chiller_PerformanceCurve_Coefficients.xls. All the data I got from the Chiller Manufacture are a set of diferent Condenser Inlet Air Temperatures (°C), and for each of these I have the Nominal Capacity (KW), the Part Load Capacities (KW) and the Coefficient of Performance - COP. For all those data, my Evaporator Chilled Water Outlet is fixed at 10 (°C) and my Evaporator Water Inlet is fixed at 17 (°C).

Is it possible to generate the Performance Curves and get the specific Coefficients with these data?

I am affraid it will not be possible because I have both my Evaporator Chilled Water and Evaporator Water Inlet fixed? Am I right?

Thanks a lot

 

--

James V Dirkes II, CEO / President
The Building Performance Team Inc.
1631 Acacia Dr, Grand Rapids, MI 49504

(alphabet soup of efforts for greater understanding: PE, BEMP, BCxP, LEED AP)

Direct / Mobile: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx

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The first idea is the worst, but it is the most important because it starts discussion and becomes the building block for other ideas.

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Posted by: Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

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