This indicates that you have some how forced certain values in sizing of the DX coil that is making your model operate outside the domain covered by set of regression equations
I really wants to know how far energy plus/DOE can go with regression or black box or non physical modeling techniques. How effective this is in real time situations. As the industry getting matured this is some of the real question which needs to be tackled by us soon.
SMH Adil,
www.geedindia.org
I really wants to know how far energy plus/DOE can go with regression or black box or non physical modeling techniques. How effective this is in real time situations. As the industry getting matured this is some of the real question which needs to be tackled by us soon.
SMH Adil,
www.geedindia.org
From: fpasserini.tn@xxxxxxxxx [EnergyPlus_Support]
Sent: 23-06-2014 20:55
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Regarding the problem of Cooling Coil sizing
I get this warning even if both the "gross rated total cooling capacity" and the "rated air flow rate" are autosized, e.g.:
Coil:Cooling:DX:SingleSpeed,
Air Loop Blocco principale:Area prep AHU/1 Unitary Cooling Coil DX Cooling Coil, !- Name
2, !- Availability Schedule Name
autosize, !- Gross Rated Total Cooling Capacity {W}
autosize, !- Gross Rated Sensible Heat Ratio
3.00, !- Gross Rated Cooling COP {W/W}
autosize, !- Rated Air Flow Rate {m3/s}
773.300000, !- Rated Evaporator Fan Power Per Volume Flow Rate {W/(m3/s)}
Air Loop Blocco principale:Area prep AHU/1 Heating Coil Air Outlet Node, !- Air Inlet Node Name
Air Loop Blocco principale:Area prep Supply Side Outlet 1, !- Air Outlet Node Name
JCI J05XP Cooling CAPFTemp, !- Total Cooling Capacity Function of Temperature Curve Name
JCI J05XP Cooling CAPFFF,!- Total Cooling Capacity Function of Flow Fraction Curve Name
JCI J05XP Cooling EIRFTemp, !- Energy Input Ratio Function of Temperature Curve Name
JCI J05XP Cooling EIRFFF,!- Energy Input Ratio Function of Flow Fraction Curve Name
JCI J05XP Cooling PLFFPLR, !- Part Load Fraction Correlation Curve Name
0.0, !- Nominal Time for Condensate Removal to Begin {s}
0.0, !- Ratio of Initial Moisture Evaporation Rate and Steady State Latent Capacity {dimensionless}
0.0, !- Maximum Cycling Rate {cycles/hr}
0.0, !- Latent Capacity Time Constant {s}
, !- Condenser Air Inlet Node Name
AirCooled, !- Condenser Type
0.90, !- Evaporative Condenser Effectiveness {dimensionless}
autosize, !- Evaporative Condenser Air Flow Rate {m3/s}
0.00, !- Evaporative Condenser Pump Rated Power Consumption {W}
0.000, !- Crankcase Heater Capacity {W}
10.00, !- Maximum Outdoor Dry-Bulb Temperature for Crankcase Heater Operation {C}
, !- Supply Water Storage Tank Name
, !- Condensate Collection Water Storage Tank Name
0.000, !- Basin Heater Capacity {W/K}
2.00, !- Basin Heater Setpoint Temperature {C}
2; !- Basin Heater Operating Schedule Name
In the .err file:
** Warning ** SizeDXCoil: Coil:Cooling:DX:SingleSpeed AIR LOOP BLOCCO PRINCIPALE:AREA PREP AHU/1 UNITARY COOLING COIL DX COOLING COIL
** ~~~ ** ...Rated Total Cooling Capacity will be limited by the minimum rated volume flow per rated total capacity ratio.
** ~~~ ** ...DX coil volume flow rate (m3/s) = 0.159839
** ~~~ ** ...Requested capacity (W) = 4088.447
** ~~~ ** ...Requested flow/capacity ratio (m3/s/W) = 3.909E-005
** ~~~ ** ...Minimum flow/capacity ratio (m3/s/W) = 4.027E-005
** ~~~ ** ...Adjusted capacity (W) = 3969.206
Is it acceptable?
Regards
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Posted by: Adil <smhadil78@xxxxxxxxx>
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