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# Revision history [back]

The first step to project HVAC System is to calculate the Thermal Load. I'm using the function Ideal Air Loads for this, is it all right? The problem is that my thermal loads in "HVAC Sizing Summary" are normally too low. The value "User Design Load per Area" is common 80 W/m2, while in my region (ASHRAE Climate Zone 2) with the typical construction here, a common value for this is 160 W/m2. Somebody has the same question? Is it wrong? I´ve already done several models with several constructions and the Thermal Load is always too low. Can somebody analyze my model?

 2 retagged __AmirRoth__ 4388 ●5 ●16 http://bleedinggreenna...

The first step to project HVAC System is to calculate the Thermal Load. I'm using the function Ideal Air Loads for this, is it all right? The problem is that my thermal loads in "HVAC Sizing Summary" are normally too low. The value "User Design Load per Area" is common 80 W/m2, while in my region (ASHRAE Climate Zone 2) with the typical construction here, a common value for this is 160 W/m2. Somebody has the same question? Is it wrong? I´ve already done several models with several constructions and the Thermal Load is always too low. Can somebody analyze my model?

### Thermal Load too lowlow in the OpenStudio / EnergyPlus

The first step to project HVAC System is to calculate the Thermal Load. I'm using the function Ideal Air Loads for this, is it all right? The problem is that my thermal loads in "HVAC Sizing Summary" are normally too low. The value "User Design Load per Area" is common 80 W/m2, while in my region (ASHRAE Climate Zone 2) with the typical construction here, a common value for this is 160 W/m2. Somebody has the same question? Is it wrong? I´ve already done several models with several constructions and the Thermal Load is always too low. Can somebody analyze my model?

 4 No.4 Revision MatthewSteen 9749 ●13 ●25 https://www.nrel.gov/b...

### Thermal Load too low in the OpenStudio / EnergyPlus

The first step to project HVAC System is to calculate the Thermal Load. I'm using the function Ideal Air Loads for this, is it all right? The problem is that my thermal loads in "HVAC Sizing Summary" are normally too low. The value "User Design Load per Area" is common 80 W/m2, while in my region (ASHRAE Climate Zone 2) with the typical construction here, a common value for this is 160 W/m2. Somebody has the same question? Is it wrong? I´ve already done several models with several constructions and the Thermal Load is always too low. Can somebody analyze my model?

 5 retagged __AmirRoth__ 4388 ●5 ●16 http://bleedinggreenna...

### Thermal Load too low in the OpenStudio / EnergyPlus

The first step to project HVAC System is to calculate the Thermal Load. I'm using the function Ideal Air Loads for this, is it all right? The problem is that my thermal loads in "HVAC Sizing Summary" are normally too low. The value "User Design Load per Area" is common 80 W/m2, while in my region (ASHRAE Climate Zone 2) with the typical construction here, a common value for this is 160 W/m2. Somebody has the same question? Is it wrong? I´ve already done several models with several constructions and the Thermal Load is always too low. Can somebody analyze my model?