RE: [EnergyPlus_Support] User Design Load

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Subject: RE: [EnergyPlus_Support] User Design Load

From: "James V Dirkes II, PE" <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

Date: Thu, 14 Apr 2011 20:56:12 -0400

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Dear Shaun,

It sounds as though you’ve got a very large Heating Sizing Factor in Sizing:Parameters or Sizing:Zone. When the User Design Load is larger than the Calculated, it means that you’ve manually sized something instead of autosized or used a large Sizing Factor.

The Building Performance Team
James V. Dirkes II, P.E., LEED AP, BEMP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of sm278424
Sent: Thursday, April 14, 2011 4:39 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] User Design Load

Hi,

In my model I am using HVACTemplate:Zone:WaterToAirHeatPump, and have autosized the cooling and heating coil rated capacity.

The "Zone Heating" output report states that my

Calculated Design Load [W] = 14,903 W (which is about right)

and

User Design Load [W] = 208,084 W (which is about 186 kW too high)

Because the program seems to use the "User Design Load" for total heating load on the plant, can you please tell me where this number is entered in the input file or how I control its calculation.

The documentation is mute on this.

Thanks,
Shaun Martin

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