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

Thanks Karen. I used 99.6% heating design conditions for WinterDesignDay and 1% cooling design conditions for SummerDesignDay from the weather file in the SizingPeriod and also changed it in the schedules and it works, but I'm just curious to know why it doesn't size using the typical conditions from the weather file.

Aber

From: Karen Walkerman <kwalkerman@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Tuesday, January 22, 2013 5:55 PM
Subject: Re: [EnergyPlus_Support] Calculated cooling and heating load zero for all zones

Hi Aber,

In "Zone Control Type Sched" you need to use SummerDesignDay and WinterDesignDay instead of SummerTypical and WinterTypical.

Karen

On Mon, Jan 21, 2013 at 11:36 PM, Aber Alvi <aberalvi@xxxxxxxxx> wrote:

Hi Karen,

Yes, below is the control type schedule and I have given the single heating and cooling set point schedule I used in my email below. These schedules apply to all zones.

Zone Control Type Sched, !- Name
Control Type, !- Schedule Type Limits Name
Through: 12/31, !- Field 1

For: SummerTypical, !- Field 2
Until: 24:00, !- Field 3
2, !- Field 4
For: WinterTypical, !- Field 5
Until: 24:00, !- Field 6
1, !- Field 7

For: AllOtherDays, !- Field 8
Until: 24:00, !- Field 9
0; !- Field 10

Thanks,

Aber

From: Karen Walkerman <kwalkerman@xxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Monday, January 21, 2013 9:02 PM
Subject: Re: [EnergyPlus_Support] Calculated cooling and heating load zero for all zones

Do you have a ZoneControl:Thermostat object?

On Jan 21, 2013 10:46 AM, "Aber Alvi" <aberalvi@xxxxxxxxx> wrote:

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