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I 'm trying to model a CRAC of a small Data Center and as you can see in the image its a Unitary system and OA system

I followed "The third edition of ASHRAE’s Thermal Guidelines for Data Processing Environments"

but the operation of the economizer does not leads to reduced cooling power rate. It has to do with the settings or has to do with the geographical location and the local climatic conditions (humidity, enthalpy etc.)?

Here 's my model:

https://we.tl/5Cmmzhz0UY

I also want your help about warnings (Not all critical) and how they can be eliminated.

ModelToIdf Warnings:

: Both surfaces 'Surface 40', and 'Surface 27 reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

: Both surfaces 'Surface 81', and 'Surface 86' reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

EnergyPlus Warnings:

: IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.

: ProcessSchedulelnput: ScheduleTypeLimits='CONTROLMODE', Unit Type='CONTROLMODE' is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits=ΊΙΝΕARPOWERDENSITYr, Unit Type="LINEARPOWERDENSITY" is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits='VOLUMETRICFLOWRATE", Unit Type=’VOLUMETRICFLOWRATE’ is invalid. : GetHTSurfaceData: Surfaces with interface to Ground found but no 'Ground Temperatures' were input. Found first in surface =SURFACE 1 Defaults, constant throughout the year of (18.0) will be used.

: CheckUsedConstructions: There are 4 nominally unused constructions in input. For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;

: Calculated design heating load for zone=THERMAL ZONE 4 is zero. Check Sizing:Zone and ZoneControkThermostat inputs.

: Calculated design heating load for zone=THERMAL ZONE 5 is zero. Check Sizing:Zone and ZoneControkThermostat inputs.

: Output:Meter: invalid Name='GAS:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTCOOLING:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTHEATING:FACILITY' - not found.

Thanks in advance !!!

I 'm trying to model a CRAC of a small Data Center and as you can see in the image its a Unitary system and OA system

I followed "The third edition of ASHRAE’s Thermal Guidelines for Data Processing Environments"

but the operation of the economizer does not leads to reduced cooling power rate. It has to do with the settings or has to do with the geographical location and the local climatic conditions (humidity, enthalpy etc.)?

Here 's my model:

https://we.tl/5Cmmzhz0UY

I also want your help about warnings (Not all critical) and how they can be eliminated.

ModelToIdf Warnings:

: Both surfaces 'Surface 40', and 'Surface 27 reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

: Both surfaces 'Surface 81', and 'Surface 86' reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

EnergyPlus Warnings:

: IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.

: ProcessSchedulelnput: ScheduleTypeLimits='CONTROLMODE', Unit Type='CONTROLMODE' is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits=ΊΙΝΕARPOWERDENSITYr, ScheduleTypeLimits=ΊΙΝΕARPOWERDENSITY", Unit Type="LINEARPOWERDENSITY" is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits='VOLUMETRICFLOWRATE", Unit Type=’VOLUMETRICFLOWRATE’ is invalid. : GetHTSurfaceData: Surfaces with interface to Ground found but no 'Ground Temperatures' were input. Found first in surface =SURFACE 1 Defaults, constant throughout the year of (18.0) will be used.

: CheckUsedConstructions: There are 4 nominally unused constructions in input. For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;

: Calculated design heating load for zone=THERMAL ZONE 4 is zero. Check Sizing:Zone and ZoneControkThermostat ZoneControl:Thermostat inputs.

: Calculated design heating load for zone=THERMAL ZONE 5 is zero. Check Sizing:Zone and ZoneControkThermostat ZoneControl:Thermostat inputs.

: Output:Meter: invalid Name='GAS:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTCOOLING:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTHEATING:FACILITY' - not found.

Thanks in advance !!!

I 'm trying to model a CRAC of a small Data Center and as you can see in the image its a Unitary system and OA system

I followed "The third edition of ASHRAE’s Thermal Guidelines for Data Processing Environments"

but the operation of the economizer does not leads to reduced cooling power rate. It has to do with the settings or has to do with the geographical location and the local climatic conditions (humidity, enthalpy etc.)?

Here 's my model:

https://we.tl/5Cmmzhz0UY

I also want your help about warnings (Not all critical) and how they can be eliminated.

ModelToIdf Warnings:

: Both surfaces 'Surface 40', and 'Surface 27 reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

: Both surfaces 'Surface 81', and 'Surface 86' reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

EnergyPlus Warnings:

: IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.

: ProcessSchedulelnput: ScheduleTypeLimits='CONTROLMODE', Unit Type='CONTROLMODE' is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits=ΊΙΝΕARPOWERDENSITY", Unit Type="LINEARPOWERDENSITY" is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits='VOLUMETRICFLOWRATE", Unit Type=’VOLUMETRICFLOWRATE’ is invalid. : GetHTSurfaceData: Surfaces with interface to Ground found but no 'Ground Temperatures' were input. Found first in surface =SURFACE 1 Defaults, constant throughout the year of (18.0) will be used.

: CheckUsedConstructions: There are 4 nominally unused constructions in input. For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;

: Calculated design heating load for zone=THERMAL ZONE 4 is zero. Check Sizing:Zone and ZoneControl:Thermostat inputs.

: Calculated design heating load for zone=THERMAL ZONE 5 is zero. Check Sizing:Zone and ZoneControl:Thermostat inputs.

: Output:Meter: invalid Name='GAS:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTCOOLING:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTHEATING:FACILITY' - not found.

Thanks in advance !!!

I 'm trying to model a CRAC of a small Data Center and as you can see in the image its a Unitary system and OA system

I followed "The third edition of ASHRAE’s Thermal Guidelines for Data Processing Environments"

but the operation of the economizer does not leads to reduced cooling power rate. It has to do with the settings or has to do with the geographical location and the local climatic conditions (humidity, enthalpy etc.)?

Here 's my model:

https://we.tl/5Cmmzhz0UY

I also want your help about warnings (Not all critical) and how they can be eliminated.

ModelToIdf Warnings:

: Both surfaces 'Surface 40', and 'Surface 27 reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

: Both surfaces 'Surface 81', and 'Surface 86' reference the same construction 'Interior Wall' but it is not symmetric, creating a reversed copy.

EnergyPlus Warnings:

: IP: Note -- Some missing fields have been filled with defaults. See the audit output file for details.

: ProcessSchedulelnput: ScheduleTypeLimits='CONTROLMODE', Unit Type='CONTROLMODE' is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits=ΊΙΝΕARPOWERDENSITY", Unit Type="LINEARPOWERDENSITY" is invalid.

: ProcessSchedulelnput: ScheduleTypeLimits='VOLUMETRICFLOWRATE", Unit Type=’VOLUMETRICFLOWRATE’ is invalid. : GetHTSurfaceData: Surfaces with interface to Ground found but no 'Ground Temperatures' were input. Found first in surface =SURFACE 1 Defaults, constant throughout the year of (18.0) will be used.

: CheckUsedConstructions: There are 4 nominally unused constructions in input. For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;

: Calculated design heating load for zone=THERMAL ZONE 4 is zero. Check Sizing:Zone and ZoneControl:Thermostat inputs.

: Calculated design heating load for zone=THERMAL ZONE 5 is zero. Check Sizing:Zone and ZoneControl:Thermostat inputs.

: Output:Meter: invalid Name='GAS:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTCOOLING:FACILITY' - not found.

: Output:Meter: invalid Name='DISTRICTHEATING:FACILITY' - not found.

Thanks in advance !!!