# [EnergyPlus_Support] Re: GSHP coefficient

```Aidan,
If I have the manufacturer data(flowrates, capacity and power), do you think whether it is proper to use the same coefficient just as the example file?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jones.aidant" <jones.aidan.t@...> wrote:
>
> From the Engineering Reference, you can describe the power and capacity with a linear relationship to and inlet temperatures and flow rates at the condenser and evaporator.
>
> You need manufacturer data for the GSHP for different conditions (flowrates and temperatures), for which corresponding power and capacity will be different. The coefficients in the equation fit model  quantify what effect a change in each of these parameters has on the capacity or power.
>
> I used excel to calculate the coefficients. I installed the Analysis ToolPak Add-In (Office button > Excel Options > Add-Ins. It shows up in the 'Data' tab).  The data (all the different combinations I could get) was put in excel as per the equation in the engineering reference (remembering to divide by the reference values). I did a regression with Y as Power or Capacity and the X Values were the relative Temperatures and Flowrates.
>
>
> I hope that helps
>
> Aidan
>
>
>
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "shubou" <dingwenting@> wrote:
> >
> > Hi,
> > Who can tell me how to decide the coefficient of GSHP? I read the reference but cannot find any hint.Thank you.
> >
> > HeatPump:WaterToWater:EquationFit:Heating,
> >     GshpHeating,             !- Name
> >     GshpHeating SourceSide Inlet Node,  !- Source Side Inlet Node Name
> >     GshpHeating SourceSide Outlet Node,  !- Source Side Outlet Node Name
> >     GshpHeating LoadSide Inlet Node,  !- Load Side Inlet Node Name
> >     GshpHeating LoadSide Outlet Node,  !- Load Side Outlet Node Name
> >     1.89E-03,                !- Rated Load Side Flow Rate {m3/s}
> >     1.89E-03,                !- Rated Source Side Flow Rate {m3/s}
> >     39040.92,                !- Rated Heating Capacity {W}
> >     5130.00,                 !- Rated Heating Power Consumption {W}
> >     -3.33491153,             !- Heating Capacity Coefficient 1
> >     -0.51451946,             !- Heating Capacity Coefficient 2
> >     4.51592706,              !- Heating Capacity Coefficient 3
> >     0.01797107,              !- Heating Capacity Coefficient 4
> >     0.155797661,             !- Heating Capacity Coefficient 5
> >     -8.93121751,             !- Heating Compressor Power Coefficient 1
> >     8.57035762,              !- Heating Compressor Power Coefficient 2
> >     1.29660976,              !- Heating Compressor Power Coefficient 3
> >     -0.21629222,             !- Heating Compressor Power Coefficient 4
> >     0.033862378,             !- Heating Compressor Power Coefficient 5
> >     0.15;                    !- Cycle Time {hr}
> >
>

------------------------------------

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:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

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.

<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)

<*> To change settings via email:
EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/

```