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Annual values of district cooling and sum of all loads don't match

I am doing a single zone case with Ideal Load Air system in EnergyPlus. After the calculation the sum of loads gives Annual value of cooling [kWh] as

Cooling:EnergyTransfer 18465.24
Cooling:EnergyTransfer:Zone:TEST ROOM 18465.24

This is sum of envelope + internal gains + infiltration

But the cooling value under District cooling is Cooling Annual Value [kWh]
DistrictCooling:Facility 21569.35
DistrictCooling:HVAC 21569.35
Cooling:DistrictCooling 21569.35

I have tried many cases but there always is a difference in the district cooling value and the sum of loads. Can some one help me understand this difference?

rdamle's avatar
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rdamle
asked 2018-10-14 23:47:11 -0500
Aaron Boranian's avatar
14.1k
Aaron Boranian
updated 2018-10-15 17:02:49 -0500
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1 Answer

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In the ZoneHVAC:IdealLoadsAirSystem object, if you want the district cooling/heating values to match what is delivered to the zone, then you need to have zero outdoor air, and no dehumidification or humidification:

ZoneHVAC:IdealLoadsAirSystem,
  . . .
  None,  !- Dehumidification Control Type
  ,      !- Cooling Sensible Heat Ratio {dimensionless}
  None,  !- Humidification Control Type
  ,      !- Design Specification Outdoor Air Object Name
MJWitte's avatar
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MJWitte
answered 2018-10-15 17:37:52 -0500
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Thank you for your reply. I will try it.

rdamle's avatar rdamle (2018-10-15 22:57:22 -0500) edit
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