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Re: [EnergyPlus_Support] Calculated cooling and heating load zero for all zones



Another thing I notice in the sensible heat gain summary of the output report of the same file is that opaque surface conduction and other heat addition is zero for zones with surfaces exposed to the ambient. The exposed surfaces boundary condition type is outdoor and is exposed to the sun and wind. Any idea why this could be happening?

Thanks,

Aber
From: Aber Alvi <aberalvi@xxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Monday, January 14, 2013 11:23 AM
Subject: [EnergyPlus_Support] Calculated cooling and heating load zero for all zones

 
Hi,

I'm getting the following warning for all the zones while trying to model a building located in climate zone 1.

** Warning ** Calculated design cooling load for zone=OS:THERMALZONE 7 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.
** Warning ** Calculated design heating load for zone=OS:THERMALZONE 7 is zero.
   **   ~~~   ** Check Sizing:Zone and ZoneControl:Thermostat inputs.

I've used the following single heating and single cooling setpoint schedule using SizingPeriod:WeatherFileConditionType.

Schedule:Compact,
    Htg-SetP-Sch,            !- Name
    Temperature,             !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: WinterTypical,            !- Field 2
    Until: 24:00,            !- Field 3
    21;                    !- Field 4
    For: SummerTypical,            !- Field 5
    Until: 24:00,            !- Field 6
    11;                    !- Field 7
    For: AllOtherDays,            !- Field 8
    Until: 24:00,            !- Field 9
    21;                    !- Field 10

Schedule:Compact,
    Clg-SetP-Sch,            !- Name
    Temperature,             !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: SummerTypical,            !- Field 2
    Until: 24:00,            !- Field 3
    23;                      !- Field 4
    For: WinterTypical,            !- Field 5
    Until: 24:00,            !- Field 6
    50;                    !- Field 7
    For: AllOtherDays,            !- Field 8
    Until: 24:00,            !- Field 9
    23;                    !- Field 10

I have used ZoneInfiltration:DesignFlowRate for the infiltration of 1.024 l/s/m2 using flow/exteriorarea as the design flow rate calculation method. I have also checked the internal gain inputs and they don't seem to be too high or low. The lighting power is in line with ASHRAE 90.1 requirements, number of people is 0.04 person/m2 and equipment load is 2.7 W/m2.


Any suggestions?


Thanks,

Aber




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