[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: RE: [EnergyPlus_Support] Curve fitting with sensor data for Coil:Cooling:DX module

Thank you for the prompt reply but How would the amount of fan heat be determined. 

Thanks in advance



---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <RRaustad@...> wrote:

Yes this is the correct approach. You must also back out fan heat when
you calculate capacity.

There is curve fitting tool supplied with EnergyPlus in the
Preprocess\HVACCurveFitTool folder.

On Fri, 29 Nov 2013 10:19:42 -0800 adrianchong85@... wrote:
> Dear EnergyPlus Users,
> I am trying do a curve fit with sensor data to model a DX system in
> EnergyPlus. Of the curves, one of them is the biquadratic cooling capacity
> function of temperature. I am thinking of obtaining the coefficients of this
> curve using least squares regression.
> The sensor data that I currently have and which I am thinking of using to
> model this curve include
> 1) Supply Air DryBulb and RH
> 2) Mixed Air DryBulb and RH
> 3) Supply Flow CFM
> 4) Condenser Inlet DryBulb and RH
> The approach I am thinking of is to compute the cooling capacity at each
> condition by first calculating the change in enthalpy (using supply and mixed
> air conditions) and multiplying by the supply air CFM. Is this approach
> reasonable???
> Also, since the sensor for the supply air drybulb and RH is not located
> directly after the evaporator but after the supply fan which is located after
> the coil, is there any preprocessing that needs to be performed on this data
> before it is used?
> Lastly, I would greatly appreciate if anyone could share with me the various
> approaches that you have used for generating the coefficients for these curves
> using sensor data.
> Regards,
> Adrian


Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:

The group web site is:

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe