[EnergyPlus_Support] put an equation in a field

[Mayeul FAURE <mayeul21@xxxxxxxxx>]

Hi,

I want to calculate the economic cost of a construction. I use for that the class "ComponentCost:LineItem"

For example, here glass wool, I use a key replacing the material's thickness of a construction (@@1@@) which will take several values (0.1,0.2,0.3...). I want the cost for each value. My formula is : Cost(?/m²)= 326,,67*thickness + 2,83. How can I introduce it in the field "cost per area"? Here is my code, it returns me the severe error below: 

** Severe  ** ComponentCost:LineItem: "COSTGLASSWOOL" Construction object needs non-zero construction costs per square meter

   **  Fatal  ** Errors found in processing cost estimate input

ComponentCost:LineItem,

    costglasswool,           !- Name

    ,                        !- Type

    Construction,            !- Line Item Type

    1,                       !- Item Name

    ,                        !- Object End Use Key

    ,                        !- Cost per Each {$}

    = @@1@@  * 326.67 + 2.83;  !- Cost per Area {$/m2}

Thank you in advance for helping,

Mayeul FAURE

HEI-Lille

France

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