[TRNSYS-users] Power Coefficients for Dry Fluid Cooler Type 511

[metkell yebiyo]

Thank you very much David, that is very clear.


Regards,
Thank you
>Metkel Yebiyo BEng (Hons), MSc
>CEREB PhD Researcher - Ground Source Heat Pumps
>Room T615
>Department of Urban Engineering
>Faculty of Engineering, Science and the Built Environment
>London South Bank University,
>103 Borough Road,
>London SE1 0AA
>Tel: +44 (0)20 7815 7639
>E: yebiyom at lsbu.ac.uk
> 


On Thursday, 2 October 2014, 13:45, David BRADLEY <d.bradley at tess-inc.com> wrote:
 


Matkel,
  The fan power is computed from an equation of the form:

pFan = pFan_rtd*(a0 + a1*yFan + a2*yFan^2 + a3*yFan^3 + ... +
    aN*yFan^N)

  where yFan is the fan control signal. If your fan is a simple
    on/off (single speed) device then you want to define a0=0 and a1=1.
    If your fan is a variable speed device and can have a control signal
    anywhere between 0 and 1 then you should set the power coefficients
    as a0=a1=a2=0 and a3=1. This relationship comes from the fan
    affinity laws.
Kind regards,
 David



On 10/2/2014 05:27, metkell yebiyo wrote:

Dear TRNSYS users,
>
>
>I am simulating a GSHP system connected to a 300kW Dry air cooler Type 511.
>The Dry air Cooler is controlled when the return temperature from the ground reaches 30degC, 
>then the Dry air cooler comes on, to maintain the fluid temperature going to the ground to 22degC.
>
>
>My question is, I am trying to obtain the amount of power drawn by the fan when the Dry air Cooler is operating. But in order for TRNSYS, to calculate the power drawn, you need to put the power coefficients a1, a2 and a3, how would I obtain this values? Is it a matter of calling the Dry air cooler manufacturer and ask them for this power coefficients or what do I need to do please?
>
>
>
>
>
>
>Thank you
>Metkel Yebiyo BEng (Hons), MSc
>CEREB PhD Researcher - Ground Source Heat Pumps 
>Room T615 
>Department of Urban Engineering 
>Faculty of Engineering, Science and the Built Environment
>London South Bank University, 
>103 Borough Road,
>London SE1 0AA
>Tel: +44 (0)20 7815 7639
>E: yebiyom at lsbu.ac.uk
> 
>
>
>
>
>
>
>_______________________________________________
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA P:+1.608.274.2577
F:+1.608.278.1475 d.bradley at tess-inc.com http://www.tess-inc.com http://www.trnsys.com
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