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Zone Ventilation

asked 2017-09-05 00:20:59 -0500

xzb86 gravatar image

Hello, I'd like to build 2 models, one with 1000m3/h Fresh air, another with 0 air flow. I want to compare the plant sizing and annual electric consumption. how to do it? (outdoor air, zone infiltration or zone ventilation design flow rate). thank you in advance.

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Please tag your question with the software you are using.

Liam gravatar image Liam  ( 2017-09-05 06:07:18 -0500 )edit

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answered 2017-09-19 14:58:06 -0500

updated 2017-09-19 15:00:34 -0500

In EnergyPlus, if you are autosizing your model you can specify the amount of outdoor air in a DesignSpecification:OutdoorAir object and reference that object in the Sizing:Zone object using the Design Specification Outdoor Air Object Name input field. You can change this from 1000 to 0 to compare results.

Sizing:Zone,
  West Zone,             !- Zone or ZoneList Name
  SupplyAirTemperature,  !- Zone Cooling Design Supply Air Temperature Input Method
  14.,                   !- Zone Cooling Design Supply Air Temperature {C}
  ,                      !- Zone Cooling Design Supply Air Temperature Difference {deltaC}
  SupplyAirTemperature,  !- Zone Heating Design Supply Air Temperature Input Method
  48.,                   !- Zone Heating Design Supply Air Temperature {C}
  ,                      !- Zone Heating Design Supply Air Temperature Difference {deltaC}
  0.009,                 !- Zone Cooling Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  0.009,                 !- Zone Heating Design Supply Air Humidity Ratio {kgWater/kgDryAir}
  SZ DSOA West Zone,     !- Design Specification Outdoor Air Object Name
  0.0,                   !- Zone Heating Sizing Factor
  0.0,                   !- Zone Cooling Sizing Factor
  DesignDay,             !- Cooling Design Air Flow Method
  0,                     !- Cooling Design Air Flow Rate {m3/s}
  ,                      !- Cooling Minimum Air Flow per Zone Floor Area {m3/s-m2}
  ,                      !- Cooling Minimum Air Flow {m3/s}
  ,                      !- Cooling Minimum Air Flow Fraction
  DesignDay,             !- Heating Design Air Flow Method
  0,                     !- Heating Design Air Flow Rate {m3/s}
  ,                      !- Heating Maximum Air Flow per Zone Floor Area {m3/s-m2}
  ,                      !- Heating Maximum Air Flow {m3/s}
  ;                      !- Heating Maximum Air Flow Fraction

DesignSpecification:OutdoorAir,
  SZ DSOA West Zone,     !- Name
  AirChanges/Hour,       !- Outdoor Air Method
  0.0,                   !- Outdoor Air Flow per Person {m3/s-person}
  0.0,                   !- Outdoor Air Flow per Zone Floor Area {m3/s-m2}
  0.0,                   !- Outdoor Air Flow per Zone {m3/s}
  1000.0;                !- Outdoor Air Flow Air Changes per Hour {1/hr}

If you are not autosizing your model you can reference the DesignSpecification:OutdoorAir object in many of the HVAC equipment models (usually ZoneHVAC equipment). Check the InputOutputReference documentation for the equipment model you are using to see where and how to specify the outdoor air quantity.

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thank you, I used this way to calculate. I tried this way to compare the outdoor air energy consumption. but I find a problem. when I compare with the 0 m3/h, 1000 m3/h, 2000 m3/h.......5000m3/h. and compare the result. that is outdoor air load per 1000 m3/h. I find the energy consumption always different, and don't have any rule. Q=cm(△h),△h and c always the same,why I can't get the same result? can you help me with this problem, because I have confused for really a long time. thank you!

xzb86 gravatar image xzb86  ( 2017-11-03 08:46:25 -0500 )edit

I would have to see your EnergyPlus input file (*.idf) to help.

rraustad gravatar image rraustad  ( 2017-11-06 09:20:51 -0500 )edit

I have write an email to you, but the email is rejected. can you tell me your e-mail address or you can send me an email: xuezhengbin86@126.com I want to send the idf file to you.

xzb86 gravatar image xzb86  ( 2017-11-29 09:23:07 -0500 )edit

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Asked: 2017-09-05 00:20:59 -0500

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Last updated: Sep 19 '17