Re: [EnergyPlus_Support] Detailed plant loop not drawing any heat

Jamie,

Your branches are fine. Your boiler/pump combination is the problem.

Change the boiler to be "ConstantFlow" and you'll get heating:

! Condensing boiler
Boiler:HotWater,
Â Â Â Condensing Boiler,Â Â Â Â Â Â !- Name
Â Â Â NaturalGas,Â Â Â Â Â Â Â Â Â Â Â Â Â !- Fuel Type
Â Â Â autosize,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Nominal Capacity {W}
Â Â Â 0.92,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Nominal Thermal Efficiency
Â Â Â EnteringBoiler,Â Â Â Â Â Â Â Â Â !- Efficiency Curve Temperature Evaluation Variable
Â Â Â CondensingBoilerEff,Â Â Â Â !- Normalized Boiler Efficiency Curve Name
Â Â Â 70,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Design Water Outlet Temperature {C}
Â Â Â autosize,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Design Water Flow Rate {m3/s}
Â Â Â 0.00,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Minimum Part Load Ratio
Â Â Â 1.00,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Maximum Part Load Ratio
Â Â Â 1.00,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Optimum Part Load Ratio
Â Â Â Condensing Boiler Inlet Node,Â !- Boiler Water Inlet Node Name
Â Â Â Condensing Boiler Outlet Node,Â !- Boiler Water Outlet Node Name
Â Â Â 80,Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Water Outlet Upper Temperature Limit {C}
Â Â Â ConstantFlow,Â Â Â Â Â Â Â Â Â Â Â !- Boiler Flow Mode
Â Â Â 25.0;Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â !- Parasitic Electric Load {W}

You're scripting the branch creation aren't you? Python?
I noticed all branch-related objects ended with "XX ;" and not classic "XX;" (the space is added).

Best,
Julien

--
Julien Marrec, EBCP, BPI MFBA
Energy&Sustainability Engineer
T: +33 6 95 14 42 13
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2014-07-16 15:12 GMT+02:00 jamiebull1@xxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>:

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I'm trying to build a plant loop from scratch rather than using template objects as I would normally do, and although I can get the simulation to run it doesn't actually draw any heat from the boiler. I'm sure I'm missing something obvious but even comparing the outputs of a similar file made from HVAC template objects I can't see where the problem is.

Could someone more experienced spot the error in my attached file?

Thanks,

Jamie