[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] Fancoil total cooling power rate & total water cooling coil power rate
The first thing you need to do is take one of your Fan Coil units and set
the Maximum Outside Air = 0.0 and then look at the reports. When you do
this then you will see exactly what you expect in the reports, ie. Total >
Sensible, and Total Water Coil Cooling Rate = Fan Coil Total Cooling Rate +
Fan Power. After you are confident that the variables are reporting what
you expect then add the mixed air stream to the results. Total Q across
the unit is just the enthalpy change and the sensible Q across the unit is
the change in enthalpy at a constant inlet humidity ratio.
QTotUnitOut = AirMassFlow * (Node(OutletNode)%Enthalpy -
QUnitOut = AirMassFlow *
Remember that these variables are looking across the entire unit including
the mixed air contributions.
For the example case that I was looking at and when you look at and report
the Temperature and Humidity Ratio at each node location, ie. FanCoil1
You will find that the Latent Load added through the mixed air is greater
than what is extracted by the Cooling Coil.
Dr. Richard J. Liesen Ph.D. M.E.
Associate Director, Building Systems Laboratory
Department of Mechanical and Industrial Engineering
University of Illinois at Urbana-Champaign
* * * * * * * * * * * * * * * * * * * * * * *
t 02:54 PM 7/16/2003, Miguel Angel Pascual wrote:
>I'm running a simulation with a FAN COIL UNIT:4 PIPE with a
>COIL:Water:SimpleCooling object and I have noticed an important difference
>between the variables "Fancoil total cooling power rate" and "total water
>cooling coil power rate". I thought that both variables should be very
>similar, but the difference is much bigger than the electric power fan.
>I am taking 100% outside air to the fancoil, and under condensing conditions
>"Fancoil total cooling power rate" and "Fancoil sensible cooling power rate"
>are almost the same. In some cases, the total cooling power rate was smaller
>than the sensible fancoil variables.
>Does anybody know what is going on?
>Miguel Ángel Pascual
>948 203 644
>[Non-text portions of this message have been removed]
>To unsubscribe from this group, send an email to:
>The primary EnergyPlus web site is found at:
>The group web site is:
>Attachments are not allowed -- please post any files to the appropriate
>folder in the Files are of the Support Web Site.
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
------------------------ Yahoo! Groups Sponsor ---------------------~-->
Free shipping on all inkjet cartridge & refill kit orders to US & Canada. Low prices up to 80% off. We have your brand: HP, Epson, Lexmark & more.
To unsubscribe from this group, send an email to:
The primary EnergyPlus web site is found at:
The group web site is:
Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/