How replace autosized values with equivalent hardsize values for heating coils
I'm trying to convert my EnergyPlus model from autosize values to hard sized values so that sizing wont change with subsequent runs. I've replaced all autosized fields with data from the EIO file, however I'm getting different results.
I've noticed quite different reported coil sizes for the Coil:Heating:Water object, between the autosized and hardsized version. I've tried two approaches and neither work:
1) Replace all fields which were autosize with values from EIO:
- U-Factor Times Area Value, Maximum Water Flow Rate, Rated Capacity
- In the EIO there are two Capacity values given: "Design Size Rated Capacity [W]" (under component sizing info) AND "Nominal Total Capacity {W}" (under Water Heater Coil Capacity Info)
- I've tried both and neither result in a coil size that matches the autosize file (based on comparing EIO files and HTML files)
2) Input Rated Capacity Only:
- changed Performance Input Method to nominalcapacity
- this causes energyplus to crash or tell me I need a sizing object, depending on whether I leave UA blank or put autosize
This seems like it should be pretty easy to do, but I'm quite confused about what E+ is doing between input capacity and the final coil size it uses. I appreciate any insight on this! Using E+ v 9.1