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I'm deriving several outputs from my model to evaluate indoor air quality.

What is the difference below? There is only a slight difference in the result value.

• 'Zone Air CO2 Concentration' vs. 'AFN Node CO2 Concentration'
• 'Zone Air Generic Air Contaminant Concentration' vs. 'AFN Node Generic Air Contaminant Concentration'
• 'Zone Air Humidity Ratio' vs. 'AFN Node Humidity Ratio'

There is one more question. When setting the output variable to 'AFN node', why do I need to enter 'zone name' instead of 'surface name' in key value? Is it an error in Energyplus?

I'm deriving several outputs from my model to evaluate indoor air quality.

What is the difference below? There is only a slight difference in the result value.

• 'Zone Air CO2 Concentration' vs. 'AFN Node CO2 Concentration'
• 'Zone Air Generic Air Contaminant Concentration' vs. 'AFN Node Generic Air Contaminant Concentration'
• 'Zone Air Humidity Ratio' vs. 'AFN Node Humidity Ratio'

There is one more question. When setting the output variable to 'AFN node', why do I need to enter input 'zone name' instead of 'surface name' in key value? Is it an error in Energyplus?

I'm deriving several outputs from my model to evaluate indoor air quality.

What is the difference below? below? There is only a slight difference in the result value.

• 'Zone Air CO2 Concentration' vs. 'AFN Node CO2 Concentration'
• 'Zone Air Generic Air Contaminant Concentration' vs. 'AFN Node Generic Air Contaminant Concentration'
• 'Zone Air Humidity Ratio' vs. 'AFN Node Humidity Ratio'

There is one more question. question. When setting the output variable to 'AFN node', why do I need to input 'zone name' 'zone name' instead of 'surface name' 'surface name' in key value? Is it an error in Energyplus?