Set rated cfm/ton to 400. (Code will be simplified in a subsequent PR.)

HPXMLtoOpenStudio/measure.xml

@@ -3,8 +3,8 @@
   <schema_version>3.1</schema_version>
   <name>hpxm_lto_openstudio</name>
   <uid>b1543b30-9465-45ff-ba04-1d1f85e763bc</uid>
-  <version_id>c95bda15-eeb0-48fc-b4d6-e446f5d5e708</version_id>
-  <version_modified>2025-02-21T23:45:46Z</version_modified>
+  <version_id>be03b9f4-60fd-454f-bce3-18f9573396fe</version_id>
+  <version_modified>2025-02-21T23:59:04Z</version_modified>
   <xml_checksum>D8922A73</xml_checksum>
   <class_name>HPXMLtoOpenStudio</class_name>
   <display_name>HPXML to OpenStudio Translator</display_name>
@@ -387,7 +387,7 @@
       <filename>hvac.rb</filename>
       <filetype>rb</filetype>
       <usage_type>resource</usage_type>
-      <checksum>D3B72165</checksum>
+      <checksum>583EBD15</checksum>
     </file>
     <file>
       <filename>hvac_sizing.rb</filename>
@@ -723,7 +723,7 @@
       <filename>test_hvac.rb</filename>
       <filetype>rb</filetype>
       <usage_type>test</usage_type>
-      <checksum>4A03BB93</checksum>
+      <checksum>DCCB51E3</checksum>
     </file>
     <file>
       <filename>test_hvac_sizing.rb</filename>

HPXMLtoOpenStudio/resources/hvac.rb

@@ -2120,11 +2120,11 @@ def self.get_heat_capacity_ratios_5F(heat_pump)
   # @return [Array<Double>] cooling cfm/ton of rated capacity for each speed
   def self.get_cool_cfm_per_ton(compressor_type)
     if compressor_type == HPXML::HVACCompressorTypeSingleStage
-      return [394.2]
+      return [400.0]
     elsif compressor_type == HPXML::HVACCompressorTypeTwoStage
-      return [411.0083, 344.1]
+      return [400.0] * 2
     elsif compressor_type == HPXML::HVACCompressorTypeVariableSpeed
-      return [400.0, 400.0, 400.0]
+      return [400.0] * 3
     else
       fail 'Compressor type not supported.'
     end
@@ -2137,11 +2137,11 @@ def self.get_cool_cfm_per_ton(compressor_type)
   def self.get_heat_cfm_per_ton(compressor_type)
     case compressor_type
     when HPXML::HVACCompressorTypeSingleStage
-      return [384.1]
+      return [400.0]
     when HPXML::HVACCompressorTypeTwoStage
-      return [391.3333, 352.2]
+      return [400.0] * 2
     when HPXML::HVACCompressorTypeVariableSpeed
-      return [400.0, 400.0, 400.0]
+      return [400.0] * 3
     else
       fail 'Compressor type not supported.'
     end
@@ -2151,7 +2151,7 @@ def self.get_heat_cfm_per_ton(compressor_type)
   #
   # @return [Array<Double>] heating cfm/ton of rated capacity for one speed
   def self.get_heat_cfm_per_ton_simple()
-    return [350.0]
+    return [400.0]
   end
 
   # TODO
@@ -4626,21 +4626,15 @@ def self.calc_plr_coefficients(c_d)
   def self.set_cool_c_d(cooling_system)
     clg_ap = cooling_system.additional_properties
 
-    # Degradation coefficient for cooling
     if is_room_dx_hvac_system(cooling_system)
       clg_ap.cool_c_d = 0.22
     else
+      # Per RESNET MINHERS Addendum 82
       case cooling_system.compressor_type
-      when HPXML::HVACCompressorTypeSingleStage
-        if calc_seer_from_seer2(cooling_system) < 13.0
-          clg_ap.cool_c_d = 0.20
-        else
-          clg_ap.cool_c_d = 0.07
-        end
-      when HPXML::HVACCompressorTypeTwoStage
-        clg_ap.cool_c_d = 0.11
+      when HPXML::HVACCompressorTypeSingleStage, HPXML::HVACCompressorTypeTwoStage
+        clg_ap.cool_c_d = 0.08
       when HPXML::HVACCompressorTypeVariableSpeed
-        clg_ap.cool_c_d = 0.25
+        clg_ap.cool_c_d = 0.40
       end
     end
 
@@ -4656,21 +4650,15 @@ def self.set_cool_c_d(cooling_system)
   def self.set_heat_c_d(heating_system)
     htg_ap = heating_system.additional_properties
 
-    # Degradation coefficient for heating
-    if (heating_system.is_a? HPXML::HeatPump) && ([HPXML::HVACTypeHeatPumpPTHP, HPXML::HVACTypeHeatPumpRoom].include? heating_system.heat_pump_type)
+    if is_room_dx_hvac_system(heating_system)
       htg_ap.heat_c_d = 0.22
     else
+      # Per RESNET MINHERS Addendum 82
       case heating_system.compressor_type
-      when HPXML::HVACCompressorTypeSingleStage
-        if calc_hspf_from_hspf2(heating_system) < 7.0
-          htg_ap.heat_c_d =  0.20
-        else
-          htg_ap.heat_c_d =  0.11
-        end
-      when HPXML::HVACCompressorTypeTwoStage
-        htg_ap.heat_c_d =  0.11
+      when HPXML::HVACCompressorTypeSingleStage, HPXML::HVACCompressorTypeTwoStage
+        htg_ap.heat_c_d = 0.08
       when HPXML::HVACCompressorTypeVariableSpeed
-        htg_ap.heat_c_d =  0.25
+        htg_ap.heat_c_d = 0.40
       end
     end
 

HPXMLtoOpenStudio/tests/test_hvac.rb

@@ -55,7 +55,7 @@ def test_central_air_conditioner_2_speed
     [4.95, 4.53].each_with_index do |cop, i|
       assert_in_epsilon(cop, clg_coil.stages[i].grossRatedCoolingCOP, 0.01)
     end
-    [5252, 7158].each_with_index do |capacity, i|
+    [5252, 7259].each_with_index do |capacity, i|
       assert_in_epsilon(capacity, clg_coil.stages[i].grossRatedTotalCoolingCapacity.get, 0.01)
     end
 
@@ -612,7 +612,7 @@ def test_air_to_air_heat_pump_2_speed
     [4.95, 4.53].each_with_index do |cop, i|
       assert_in_epsilon(cop, clg_coil.stages[i].grossRatedCoolingCOP, 0.01)
     end
-    [7870, 10736].each_with_index do |clg_capacity, i|
+    [7870, 10888].each_with_index do |clg_capacity, i|
       assert_in_epsilon(clg_capacity, clg_coil.stages[i].grossRatedTotalCoolingCapacity.get, 0.01)
     end
 
@@ -1375,10 +1375,10 @@ def test_install_quality_air_to_air_heat_pump_2_speed
     # Get HPXML values
     heat_pump = hpxml_bldg.heat_pumps[0]
     program_values = _check_install_quality_multispeed_ratio(heat_pump, model, heat_pump)
-    [0.87, 0.87].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
-    [0.8, 0.8].each_with_index do |rated_airflow_ratio, i|
+    [0.7, 0.7].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_htg'][i], 0.01)
     end
   end
@@ -1391,10 +1391,10 @@ def test_install_quality_air_to_air_heat_pump_var_speed
     # Get HPXML values
     heat_pump = hpxml_bldg.heat_pumps[0]
     program_values = _check_install_quality_multispeed_ratio(heat_pump, model, heat_pump)
-    [0.748, 0.748].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
-    [0.702, 0.702].each_with_index do |rated_airflow_ratio, i|
+    [0.70, 0.70].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_htg'][i], 0.01)
     end
 
@@ -1404,10 +1404,10 @@ def test_install_quality_air_to_air_heat_pump_var_speed
     # Get HPXML values
     heat_pump = hpxml_bldg.heat_pumps[0]
     program_values = _check_install_quality_multispeed_ratio(heat_pump, model, heat_pump)
-    [0.748, 0.748].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
-    [0.702, 0.702].each_with_index do |rated_airflow_ratio, i|
+    [0.70, 0.70].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_htg'][i], 0.01)
     end
   end
@@ -1458,7 +1458,7 @@ def test_install_quality_furnace_central_air_conditioner_2_speed
     # Get HPXML values
     cooling_system = hpxml_bldg.cooling_systems[0]
     program_values = _check_install_quality_multispeed_ratio(cooling_system, model)
-    [0.87, 0.87].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
   end
@@ -1471,7 +1471,7 @@ def test_install_quality_furnace_central_air_conditioner_var_speed
     # Get HPXML values
     cooling_system = hpxml_bldg.cooling_systems[0]
     program_values = _check_install_quality_multispeed_ratio(cooling_system, model)
-    [0.747, 0.748].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
   end
@@ -1554,10 +1554,10 @@ def test_install_quality_mini_split_heat_pump
     # Get HPXML values
     heat_pump = hpxml_bldg.heat_pumps[0]
     program_values = _check_install_quality_multispeed_ratio(heat_pump, model, heat_pump)
-    [0.748, 0.748].each_with_index do |rated_airflow_ratio, i|
+    [0.75, 0.75].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_clg'][i], 0.01)
     end
-    [0.702, 0.702].each_with_index do |rated_airflow_ratio, i|
+    [0.70, 0.70].each_with_index do |rated_airflow_ratio, i|
       assert_in_epsilon(rated_airflow_ratio, program_values['FF_AF_htg'][i], 0.01)
     end
   end