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I found hard to estimate a correct infiltration rate in energyplus. The heating load results are such dependant on those rates that I am not sure what to use. Following the guide, there are some suggestion as to what number to use for coefficient such as wind speed, etc...I am used to work it out based on air change rate (1 ac/h would be a leaky building and 0.25 a tight one). Some have used 0.05cfm/ft2 of exterior wall. Others would assume a 10 feet zone around the building perimeter with 1 ac/h. Could someone have an insight of a correct method?

I found hard to estimate a correct infiltration rate in energyplus. The heating load results are such dependant on those rates that I am not sure what to use. Following the guide, there are some suggestion as to what number to use for coefficient such as wind speed, etc...I am used to work it out based on air change rate (1 ac/h would be a leaky building and 0.25 a tight one). Some have used 0.05cfm/ft2 of exterior wall. Others would assume a 10 feet zone around the building perimeter with 1 ac/h. Could someone have an insight of a correct method?

I found hard to estimate a correct infiltration rate in energyplus. The heating load results are such dependant on those rates that I am not sure what to use. Following the guide, there are some suggestion as to what number to use for coefficient such as wind speed, etc...I am used to work it out based on air change rate (1 ac/h would be a leaky building and 0.25 a tight one). Some have used 0.05cfm/ft2 of exterior wall. Others would assume a 10 feet zone around the building perimeter with 1 ac/h. Could someone have an insight of a correct method?