{
"formulas": { "fdwr_formula": { "data_type": "formula", "refs": [ "NECB2011_S_3.2.1.4(1)" ], "required_variables": [ "hdd" ], "value": "( hdd <= 4000.0) ? 0.4 : ( hdd > 4000.0 and hdd < 7000.0 ) ? ( (2000.0 - 0.2 * hdd) / 3000.00) : 0.2;", "units": "ratio", "notes": "Requires hdd to be defined to be evaluated in code." } }
}