EnergyPlus itself doesn’t support that input syntax. The field needs a plain number. That cost object is tied to a single Construction object, so I would think you would want different Construction and ComponentCost:LineItem objects for each thickness. Then you can do the calculation yourself a head of time each.
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Mayeul FAURE
Sent: Thursday, March 21, 2013 9:32 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] put an equation in a field
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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