Hi,
I have been trying to create performance curve for a VRF
system. I have followed Richard's paper to create them. I am
misunderstanding the way extrapolation is done. The way I
extrapolated is;
1) Use Cooling capacity ration function for Low and high
temperatures to predict CPFT (predicted) for all temperature
range (e.g. -5C to -43C) for both these curves.
2) Finding the intersection of these curves (or very close
points) and taking that ODB (outdoor dry-bulb) as a boundary
curve point for a particular indoor wet-bulb temperature.
However, by doing this I don't have any discontinuity (as points
do tend to nearly overlap/intersect).
3) In order to plot boundary curve, I used cooling capacity
ratio boundary curve to predicted ODB for each extrapolated IWB
e.g. 5C, 10C IWB etc. Then, I used that predicted temperature to
calculate predicted CPFT.
Please see attached performance curve for cooling. The cubic
curve does not even
--
Richard Raustad
Florida Solar Energy Center
1679 Clearlake Road
Cocoa, FL 32922
Ph: (321)638-1454
http://www.fsec.ucf.edu/en/
Program Director
Electric Vehicle Transportation Center
http://evtc.fsec.ucf.edu/
__._,_.___
View attachments on the web
Posted by: Richard Raustad <rraustad@xxxxxxxxxxxx>
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.
__,_._,___