Have you reviewed the output variables for both cases to see where they are different?
p.s., the typical coil curves should not affect you. They normally vary capacity only a few percent over the range of normal operation.
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Tuesday, November 15, 2011 6:51 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] increased sizing:parameter gives more hours not met - DX cooling
Dear Group,
Normally, upping the sizing factor should decrease unmet loads. I'm experiencing the OPPOSITE effect. I'm wondering if the curves describing the DX performance are mucking me about. They are default curves from design builder. Should I be adjusting these for a ASHRAE baseline case model?
Coil:Cooling:DX:SingleSpeed,
118451 AHU Cooling Coil, !- Name
SchCpct_LowTempClgOFF, !- Availability Schedule Name
autosize, !- Rated Total Cooling Capacity {W}
autosize, !- Rated Sensible Heat Ratio
3.81, !- Rated COP
autosize, !- Rated Air Flow Rate {m3/s}
, !- Rated Evaporator Fan Power Per Volume Flow Rate {W/(m3/s)}
118451 AHU Gas Heating Coil Outlet, !- Air Inlet Node Name
118451 Unitary Unit Outlet, !- Air Outlet Node Name
118451 AHU DX Coil Cap-FT, !- Total Cooling Capacity Function of Temperature Curve Name
118451 AHU DX Coil Cap-FF, !- Total Cooling Capacity Function of Flow Fraction Curve Name
118451 AHU DX Coil EIR-FT, !- Energy Input Ratio Function of Temperature Curve Name
118
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