lib/openstudio-standards/standards/Standards.AirTerminalSingleDuctVAVReheat.rb in openstudio-standards-0.1.15 vs lib/openstudio-standards/standards/Standards.AirTerminalSingleDuctVAVReheat.rb in openstudio-standards-0.2.0.rc1

@@ -1,43 +1,77 @@
 
-class OpenStudio::Model::AirTerminalSingleDuctVAVReheat
+class Standard
+  # @!group AirTerminalSingleDuctVAVReheat
+
   # Set the minimum damper position based on OA
   # rate of the space and the template.
   # Zones with low OA per area get lower initial guesses.
   # Final position will be adjusted upward
   # as necessary by Standards.AirLoopHVAC.adjust_minimum_vav_damper_positions
-  # @param template [String] the template
   # @param zone_min_oa [Double] the zone outdoor air flow rate, in m^3/s.
   # If supplied, this will be set as a minimum limit in addition to the minimum
   # damper position.  EnergyPlus will use the larger of the two values during sizing.
   # @param has_ddc [Bool] whether or not there is DDC control of the VAV terminal,
   # which impacts the minimum damper position requirement.
   # @return [Bool] returns true if successful, false if not
   # @todo remove exception where older vintages don't have minimum positions adjusted.
-  def apply_minimum_damper_position(template, zone_min_oa = nil, has_ddc = true)
+  def air_terminal_single_duct_vav_reheat_apply_minimum_damper_position(air_terminal_single_duct_vav_reheat, zone_min_oa = nil, has_ddc = true)
     # Minimum damper position
-    min_damper_position = nil
-    case template
-    when 'DOE Ref Pre-1980', 'DOE Ref 1980-2004', '90.1-2004'
-      min_damper_position = 0.3
-    when '90.1-2007'
-      min_damper_position = 0.3
-    when '90.1-2010', '90.1-2013'
-      min_damper_position = if has_ddc
-                              0.2
-                            else
-                              0.3
-                            end
-    end
-    setConstantMinimumAirFlowFraction(min_damper_position)
+    min_damper_position = air_terminal_single_duct_vav_reheat_minimum_damper_position(air_terminal_single_duct_vav_reheat, has_ddc)
+    air_terminal_single_duct_vav_reheat.setConstantMinimumAirFlowFraction(min_damper_position)
+    OpenStudio.logFree(OpenStudio::Debug, 'openstudio.standards.AirTerminalSingleDuctVAVReheat', "For #{air_terminal_single_duct_vav_reheat.name}: set minimum damper position to #{min_damper_position}.")
 
     # Minimum OA flow rate
     # If specified, will also add this limit
     # and the larger of the two will be used
     # for sizing.
     unless zone_min_oa.nil?
-      setFixedMinimumAirFlowRate(zone_min_oa)
+      air_terminal_single_duct_vav_reheat.setFixedMinimumAirFlowRate(zone_min_oa)
     end
 
     return true
+  end
+
+  # Specifies the minimum damper position for VAV dampers.
+  # Defaults to 30%
+  #
+  # @param has_ddc [Bool] whether or not there is DDC control of the VAV terminal in question
+  def air_terminal_single_duct_vav_reheat_minimum_damper_position(air_terminal_single_duct_vav_reheat, has_ddc = false)
+    min_damper_position = 0.3
+    return min_damper_position
+  end
+
+  # Sets the capacity of the reheat coil based on the minimum flow fraction,
+  # and the maximum flow rate.
+  def air_terminal_single_duct_vav_reheat_set_heating_cap(air_terminal_single_duct_vav_reheat)
+    flow_rate_fraction = air_terminal_single_duct_vav_reheat.constantMinimumAirFlowFraction
+    if air_terminal_single_duct_vav_reheat.reheatCoil.to_CoilHeatingWater.is_initialized
+      reheat_coil = air_terminal_single_duct_vav_reheat.reheatCoil.to_CoilHeatingWater.get
+      if reheat_coil.autosizedRatedCapacity.to_f < 1.0e-6
+        cap = 1.2 * 1000.0 * air_terminal_single_duct_vav_reheat.constantMinimumAirFlowFraction * air_terminal_single_duct_vav_reheat.autosizedMaximumAirFlowRate.to_f * (18.0 - 13.0)
+        reheat_coil.setPerformanceInputMethod('NominalCapacity')
+        reheat_coil.setRatedCapacity(cap)
+        air_terminal_single_duct_vav_reheat.setMaximumReheatAirTemperature(18.0)
+      end
+    end
+  end
+
+  # Determines whether the terminal has a NaturalGas,
+  # Electricity, or HotWater reheat coil.
+  # @return [String] reheat type.  One of NaturalGas,
+  # Electricity, or HotWater.
+  def air_terminal_single_duct_vav_reheat_reheat_type(air_terminal_single_duct_vav_reheat)
+    type = nil
+
+    # Get the reheat coil
+    rht_coil = air_terminal_single_duct_vav_reheat.reheatCoil
+    if rht_coil.to_CoilHeatingElectric.is_initialized
+      type = 'Electricity'
+    elsif rht_coil.to_CoilHeatingWater.is_initialized
+      type = 'HotWater'
+    elsif rht_coil.to_CoilHeatingGas.is_initialized
+      type = 'NaturalGas'
+    end
+
+    return type
   end
 end