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[EnergyPlus_Support] DX:CoolingBypassFactorEmpirical object

We have an input file which uses the COIL:DX:CoolingBypassFactorEmpirical object and is causing some problems.

I have uploaded the example file HevacompDXCoolingProblem.zip.

When run through v1.4 an error is reported as follows:

   ** Severe  ** COIL:DX:COOLINGBYPASSFACTOREMPIRICAL "WC:C2 FF OPEN" -- coil bypass factor calculation did not converge after max iterations.
   **   ~~~   ** The RatedSHR of 0.571, entered by the user or autosized (see *.eio file),
   **   ~~~   ** may be causing this. The line defined by the coil rated inlet air conditions
   **   ~~~   ** (26.7C drybulb and 19.4C wetbulb) and the RatedSHR (i.e., slope of the line) must intersect
   **   ~~~   ** the saturation curve of the psychrometric chart. If the RatedSHR is too low, then this
   **   ~~~   ** intersection may not occur and the coil bypass factor calculation will not converge.
   **   ~~~   ** If autosizing the SHR, recheck the design supply air humidity ratio and design supply air
   **   ~~~   ** temperature values in the System Sizing and Zone Sizing objects. In general, the temperatures
   **   ~~~   ** and humidity ratios specified in these two objects should be the same for each system
   **   ~~~   ** and the zones that it serves.

Given the absense of a system sizing object, I am unsure how else to address this problem. Any help would be appreciated.
Brian Aldred
Software Development
Tel: 0114 255 6680
Fax: 0114 255 6638



Hevacomp Ltd is a company registered in England and Wales with company number 1523216
Registered office: Smithywood House, Smithywood Crescent, Sheffield, S8 0NU 

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