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

[EnergyPlus_Support] Coil:Cooling:WaterToAirHeatPump:EquationFit: Buggy Warning Message?

I'm using: 

Coil:Cooling:WaterToAirHeatPump:EquationFit and Coil:Heating:WaterToAirHeatPump:EquationFit 

objects to model a heatpump using the curve-fitting methodology.  

There are two parameters in Coil:Cooling:WaterToAirHeatPump:EquationFit:
1. Rated Total Cooling Capacity {W}
2. Rated Sensible Cooling Capacity {W} 

Naturally, these two numbers will be different.  When I run my idf I get the following warning:

"...heating capacity is disproportionate (> 20% different) to cooling capacity"

It's apparent that it's comparing the Total cooling capacity to the Heating Capacity rather than comparing the Sensible Cooling Capacity to the Heating Capacity.

Does anyone know if this is a bug (to be ignored) or whether I'm doing something wrong?

My data is:

Rated Total Cooling Capacity:    8324
Rated Sensible Cooling Capacity: 5715
Rated Heating Capacity:          5686

A related question is: are these rated numbers the capacity numbers that the manufacturer typically publishes (using industry standard conditions) or are they the maximum capacity numbers found in the manufacturer's data.  (The spreadsheet that generates the curve-fitting coefficients specifically uses the maximum numbers; the InputOutput doc for e+ is a little ambiguous as to what is required for these rated parameters in the EquationFit objects).

I've been assuming the former.






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

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.
Yahoo! Groups Links

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

<*> Your email settings:
    Individual Email | Traditional

<*> 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/