lib/openstudio-standards/constructions/modify.rb in openstudio-standards-0.6.0.rc2 vs lib/openstudio-standards/constructions/modify.rb in openstudio-standards-0.6.3

@@ -113,18 +113,18 @@
         OpenStudio.logFree(OpenStudio::Warn, 'OpenstudioStandards::Constructions', "Can only set the u-value of opaque constructions or simple glazing. #{construction.name} is not opaque or simple glazing.")
         return false
       end
 
       # Make sure an insulation layer was specified
-      if insulation_layer_name.nil? && target_u_value_ip == 0.0
+      if insulation_layer_name.nil? && (target_u_value_ip.abs < 0.01)
         # Do nothing if the construction already doesn't have an insulation layer
       elsif insulation_layer_name.nil?
         insulation_layer_name = OpenstudioStandards::Constructions.construction_find_and_set_insulation_layer(construction).name.get
       end
 
       # Remove the insulation layer if the specified U-value is zero.
-      if target_u_value_ip == 0.0
+      if target_u_value_ip.abs < 0.01
         layer_index = 0
         construction.layers.each do |layer|
           break if layer.name.get == insulation_layer_name
 
           layer_index += 1
@@ -298,11 +298,11 @@
     # @param target_f_factor_ip [Double] Target F-Factor (Btu/ft*h*R)
     # @param insulation_layer_name [String] The name of the insulation layer in this construction
     # @return [Boolean] returns true if successful, false if not
     def self.construction_set_slab_f_factor(construction, target_f_factor_ip, insulation_layer_name: nil)
       # Regression from table A6.3 unheated, fully insulated slab
-      r_value_ip = 1.0248 * target_f_factor_ip**-2.186
+      r_value_ip = 1.0248 * (target_f_factor_ip**-2.186)
       u_value_ip = 1.0 / r_value_ip
 
       # Set the insulation U-value
       OpenstudioStandards::Constructions.construction_set_u_value(construction, u_value_ip,
                                                                   insulation_layer_name: insulation_layer_name,
@@ -360,10 +360,10 @@
     # @param target_c_factor_ip [Double] Target C-Factor (Btu/ft^2*h*R)
     # @param insulation_layer_name [String] The name of the insulation layer in this construction
     # @return [Boolean] returns true if successful, false if not
     def self.construction_set_underground_wall_c_factor(construction, target_c_factor_ip, insulation_layer_name: nil)
       # Regression from table A4.2 continuous exterior insulation
-      r_value_ip = 0.775 * target_c_factor_ip**-1.067
+      r_value_ip = 0.775 * (target_c_factor_ip**-1.067)
       u_value_ip = 1.0 / r_value_ip
 
       # Set the insulation U-value
       OpenstudioStandards::Constructions.construction_set_u_value(construction, u_value_ip,
                                                                   insulation_layer_name: insulation_layer_name,