Building Energy Standards Chiller Data Update

lib/openstudio-standards/prototypes/common/objects/Prototype.hvac_systems.rb

@@ -5372,7 +5372,7 @@ def model_add_furnace_central_ac(model,
                                                        name: "#{air_loop.name} Cooling Coil",
                                                        type: 'Residential Central AC')
         clg_coil.setRatedSensibleHeatRatio(shr)
-        clg_coil.setRatedCOP(OpenStudio::OptionalDouble.new(eer_to_cop(eer)))
+        clg_coil.setRatedCOP(OpenStudio::OptionalDouble.new(eer_to_cop_no_fan(eer)))
         clg_coil.setRatedEvaporatorFanPowerPerVolumeFlowRate(OpenStudio::OptionalDouble.new(ac_w_per_cfm / OpenStudio.convert(1.0, 'cfm', 'm^3/s').get))
         clg_coil.setNominalTimeForCondensateRemovalToBegin(OpenStudio::OptionalDouble.new(1000.0))
         clg_coil.setRatioOfInitialMoistureEvaporationRateAndSteadyStateLatentCapacity(OpenStudio::OptionalDouble.new(1.5))

lib/openstudio-standards/prototypes/common/objects/Prototype.utilities.rb

@@ -281,7 +281,7 @@ def cop_to_seer_cooling_no_fan(cop)
   # @return [Double] Coefficient of Performance (COP)
   def seer_to_cop_cooling_with_fan(seer)
     eer = -0.0182 * seer * seer + 1.1088 * seer
-    cop = (eer / 3.413 + 0.12) / (1 - 0.12)
+    cop = (eer / OpenStudio.convert(1.0, 'W', 'Btu/h').get + 0.12) / (1 - 0.12)
 
     return cop
   end
@@ -292,7 +292,7 @@ def seer_to_cop_cooling_with_fan(seer)
   # @param cop [Double] Coefficient of Performance (COP)
   # @return [Double] seasonal energy efficiency ratio (SEER)
   def cop_to_seer_cooling_with_fan(cop)
-    eer = cop_to_eer(cop)
+    eer = cop_to_eer_no_fan(cop)
     delta = 1.1088**2 - 4.0 * 0.0182 * eer
     seer = (1.1088 - delta**0.5) / (2.0 * 0.0182)
 
@@ -343,13 +343,13 @@ def hspf_to_cop_heating_with_fan(hspf)
   # @param eer [Double] Energy Efficiency Ratio (EER)
   # @param capacity_w [Double] the heating capacity at AHRI rating conditions, in W
   # @return [Double] Coefficient of Performance (COP)
-  def eer_to_cop(eer, capacity_w = nil)
+  def eer_to_cop_no_fan(eer, capacity_w = nil)
     if capacity_w.nil?
       # The PNNL Method.
       # r is the ratio of supply fan power to total equipment power at the rating condition,
       # assumed to be 0.12 for the reference buildings per PNNL.
       r = 0.12
-      cop = (eer / 3.413 + r) / (1 - r)
+      cop = (eer / OpenStudio.convert(1.0, 'W', 'Btu/h').get + r) / (1 - r)
     else
       # The 90.1-2013 method
       # Convert the capacity to Btu/hr
@@ -365,13 +365,13 @@ def eer_to_cop(eer, capacity_w = nil)
   #
   # @param cop [Double] COP
   # @return [Double] Energy Efficiency Ratio (EER)
-  def cop_to_eer(cop, capacity_w = nil)
+  def cop_to_eer_no_fan(cop, capacity_w = nil)
     if capacity_w.nil?
       # The PNNL Method.
       # r is the ratio of supply fan power to total equipment power at the rating condition,
       # assumed to be 0.12 for the reference buildngs per PNNL.
       r = 0.12
-      eer = 3.413 * (cop * (1 - r) - r)
+      eer = OpenStudio.convert(1.0, 'W', 'Btu/h').get * (cop * (1 - r) - r)
     else
       # The 90.1-2013 method
       # Convert the capacity to Btu/hr
@@ -382,6 +382,14 @@ def cop_to_eer(cop, capacity_w = nil)
     return eer
   end
 
+  # Convert from EER to COP
+  #
+  # @param cop [Double] Energy Efficiency Ratio (EER)
+  # @return [Double] Coefficient of Performance (COP)
+  def eer_to_cop(eer)
+    return eer / OpenStudio.convert(1.0, 'W', 'Btu/h').get
+  end
+
   # Convert from COP to kW/ton
   #
   # @param cop [Double] Coefficient of Performance (COP)

lib/openstudio-standards/standards/Standards.ChillerElectricEIR.rb

@@ -12,10 +12,7 @@ def chiller_electric_eir_find_search_criteria(chiller_electric_eir)
     # Determine if WaterCooled or AirCooled by
     # checking if the chiller is connected to a condenser
     # water loop or not.  Use name as fallback for exporting HVAC library.
-    cooling_type = 'AirCooled'
-    if chiller_electric_eir.secondaryPlantLoop.is_initialized || chiller_electric_eir.name.get.to_s.include?('WaterCooled')
-      cooling_type = 'WaterCooled'
-    end
+    cooling_type = chiller_electric_eir.condenserType
 
     search_criteria['cooling_type'] = cooling_type
 
@@ -59,6 +56,12 @@ def chiller_electric_eir_find_search_criteria(chiller_electric_eir)
       search_criteria['compressor_type'] = compressor_type
     end
 
+    # @todo Find out what compliance path is desired
+    # perhaps this could be set using additional
+    # properties when the chiller is created
+    # Assume path a by default for now
+    search_criteria['compliance_path'] = 'Path A'
+
     return search_criteria
   end
 
@@ -92,13 +95,26 @@ def chiller_electric_eir_standard_minimum_full_load_efficiency(chiller_electric_
     capacity_tons = OpenStudio.convert(capacity_w, 'W', 'ton').get
     chlr_props = model_find_object(standards_data['chillers'], search_criteria, capacity_tons, Date.today)
 
-    if chlr_props.nil? || !chlr_props['minimum_full_load_efficiency']
+    if chlr_props.nil?
+      search_criteria.delete('compliance_path')
+      chlr_props = model_find_object(standards_data['chillers'], search_criteria, capacity_tons, Date.today)
+    end
+    if chlr_props.nil?
       OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.ChillerElectricEIR', "For #{chiller_electric_eir.name}, cannot find minimum full load efficiency.")
       return nil
     else
-      # lookup the efficiency value
-      kw_per_ton = chlr_props['minimum_full_load_efficiency']
-      cop = kw_per_ton_to_cop(kw_per_ton)
+      cop = nil
+      if !chlr_props['minimum_coefficient_of_performance'].nil?
+        cop = chlr_props['minimum_coefficient_of_performance']
+      elsif !chlr_props['minimum_energy_efficiency_ratio'].nil?
+        cop = eer_to_cop(chlr_props['minimum_energy_efficiency_ratio'])
+      elsif !chlr_props['minimum_kilowatts_per_tons'].nil?
+        cop = kw_per_ton_to_cop(chlr_props['minimum_kilowatts_per_tons'])
+      end
+      if cop.nil?
+        OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.ChillerElectricEIR', "For #{chiller_electric_eir.name}, cannot find minimum full load efficiency.")
+        return nil
+      end
     end
 
     return cop
@@ -128,10 +144,26 @@ def chiller_electric_eir_apply_efficiency_and_curves(chiller_electric_eir, clg_t
 
     # Get the chiller properties
     chlr_props = model_find_object(chillers, search_criteria, capacity_tons, Date.today)
-    unless chlr_props
+    cop = nil
+    if chlr_props.nil?
+      search_criteria.delete('compliance_path')
+      chlr_props = model_find_object(standards_data['chillers'], search_criteria, capacity_tons, Date.today)
+    end
+    if chlr_props.nil?
       OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.ChillerElectricEIR', "For #{chiller_electric_eir.name}, cannot find chiller properties using #{search_criteria}, cannot apply standard efficiencies or curves.")
-      successfully_set_all_properties = false
-      return successfully_set_all_properties
+      return false
+    else
+      if !chlr_props['minimum_coefficient_of_performance'].nil?
+        cop = chlr_props['minimum_coefficient_of_performance']
+      elsif !chlr_props['minimum_energy_efficiency_ratio'].nil?
+        cop = eer_to_cop(chlr_props['minimum_energy_efficiency_ratio'])
+      elsif !chlr_props['minimum_kilowatts_per_tons'].nil?
+        cop = kw_per_ton_to_cop(chlr_props['minimum_kilowatts_per_tons'])
+      end
+      if cop.nil?
+        OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.ChillerElectricEIR', "For #{chiller_electric_eir.name}, cannot find minimum full load efficiency.")
+        return false
+      end
     end
 
     # Make the CAPFT curve
@@ -163,15 +195,11 @@ def chiller_electric_eir_apply_efficiency_and_curves(chiller_electric_eir, clg_t
     end
 
     # Set the efficiency value
-    kw_per_ton = nil
-    cop = nil
-    if chlr_props['minimum_full_load_efficiency']
-      kw_per_ton = chlr_props['minimum_full_load_efficiency']
-      cop = kw_per_ton_to_cop(kw_per_ton)
-      chiller_electric_eir.setReferenceCOP(cop)
-    else
+    if cop.nil?
       OpenStudio.logFree(OpenStudio::Warn, 'openstudio.standards.ChillerElectricEIR', "For #{chiller_electric_eir.name}, cannot find minimum full load efficiency, will not be set.")
       successfully_set_all_properties = false
+    else
+      chiller_electric_eir.setReferenceCOP(cop)
     end
 
     # Append the name with size and kw/ton

lib/openstudio-standards/standards/Standards.CoilCoolingDXMultiSpeed.rb

@@ -163,7 +163,7 @@ def coil_cooling_dx_multi_speed_apply_efficiency_and_curves(coil_cooling_dx_mult
       capacity_btu_per_hr = 7000 if capacity_btu_per_hr < 7000
       capacity_btu_per_hr = 15_000 if capacity_btu_per_hr > 15_000
       ptac_eer = ptac_eer_coeff_1 + (ptac_eer_coeff_2 * capacity_btu_per_hr)
-      cop = eer_to_cop(ptac_eer)
+      cop = eer_to_cop_no_fan(ptac_eer)
       # self.setName("#{self.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{ptac_eer}EER")
       new_comp_name = "#{coil_cooling_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{ptac_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXMultiSpeed', "For #{template}: #{coil_cooling_dx_multi_speed.name}: #{cooling_type} #{heating_type} #{subcategory} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{ptac_eer}")
@@ -181,7 +181,7 @@ def coil_cooling_dx_multi_speed_apply_efficiency_and_curves(coil_cooling_dx_mult
     # If specified as EER
     unless ac_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = ac_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXMultiSpeed', "For #{template}: #{coil_cooling_dx_multi_speed.name}: #{cooling_type} #{heating_type} #{subcategory} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end
@@ -198,7 +198,7 @@ def coil_cooling_dx_multi_speed_apply_efficiency_and_curves(coil_cooling_dx_mult
     # If specified as EER (heat pump)
     unless ac_props['minimum_full_load_efficiency'].nil?
       min_eer = ac_props['minimum_full_load_efficiency']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXMultiSpeed', "For #{template}: #{coil_cooling_dx_multi_speed.name}: #{cooling_type} #{heating_type} #{subcategory} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end
@@ -281,7 +281,7 @@ def coil_cooling_dx_multi_speed_standard_minimum_cop(coil_cooling_dx_multi_speed
     # If specified as EER
     unless ac_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = ac_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXMultiSpeed', "For #{template}: #{coil_cooling_dx_multi_speed.name}: #{cooling_type} #{heating_type} #{coil_dx_subcategory(coil_cooling_dx_multi_speed)} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end
@@ -298,7 +298,7 @@ def coil_cooling_dx_multi_speed_standard_minimum_cop(coil_cooling_dx_multi_speed
     # If specified as EER (heat pump)
     unless ac_props['minimum_full_load_efficiency'].nil?
       min_eer = ac_props['minimum_full_load_efficiency']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXMultiSpeed', "For #{template}: #{coil_cooling_dx_multi_speed.name}: #{cooling_type} #{heating_type} #{coil_dx_subcategory(coil_cooling_dx_multi_speed)} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end

lib/openstudio-standards/standards/Standards.CoilCoolingDXSingleSpeed.rb

@@ -86,7 +86,7 @@ def coil_cooling_dx_single_speed_standard_minimum_cop(coil_cooling_dx_single_spe
       eer_calc_cap_btu_per_hr = 7000 if capacity_btu_per_hr < 7000
       eer_calc_cap_btu_per_hr = 15_000 if capacity_btu_per_hr > 15_000
       pthp_eer = pthp_eer_coeff_1 - (pthp_eer_coeff_2 * eer_calc_cap_btu_per_hr / 1000.0)
-      cop = eer_to_cop(pthp_eer)
+      cop = eer_to_cop_no_fan(pthp_eer)
       new_comp_name = "#{coil_cooling_dx_single_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{pthp_eer.round(1)}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXSingleSpeed', "For #{coil_cooling_dx_single_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{pthp_eer.round(1)}")
     end
@@ -104,7 +104,7 @@ def coil_cooling_dx_single_speed_standard_minimum_cop(coil_cooling_dx_single_spe
       eer_calc_cap_btu_per_hr = 7000 if capacity_btu_per_hr < 7000
       eer_calc_cap_btu_per_hr = 15_000 if capacity_btu_per_hr > 15_000
       ptac_eer = ptac_eer_coeff_1 - (ptac_eer_coeff_2 * eer_calc_cap_btu_per_hr / 1000.0)
-      cop = eer_to_cop(ptac_eer)
+      cop = eer_to_cop_no_fan(ptac_eer)
       new_comp_name = "#{coil_cooling_dx_single_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{ptac_eer.round(1)}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXSingleSpeed', "For #{coil_cooling_dx_single_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{ptac_eer.round(1)}")
     end
@@ -140,7 +140,7 @@ def coil_cooling_dx_single_speed_standard_minimum_cop(coil_cooling_dx_single_spe
     # If specified as EER
     unless ac_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = ac_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_single_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXSingleSpeed', "For #{template}: #{coil_cooling_dx_single_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end
@@ -156,7 +156,7 @@ def coil_cooling_dx_single_speed_standard_minimum_cop(coil_cooling_dx_single_spe
     # If specified as EER (heat pump)
     unless ac_props['minimum_full_load_efficiency'].nil?
       min_eer = ac_props['minimum_full_load_efficiency']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_single_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXSingleSpeed', "For #{template}: #{coil_cooling_dx_single_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end

lib/openstudio-standards/standards/Standards.CoilCoolingDXTwoSpeed.rb

@@ -70,7 +70,7 @@ def coil_cooling_dx_two_speed_standard_minimum_cop(coil_cooling_dx_two_speed, re
     # If specified as EER
     unless ac_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = ac_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_two_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXTwoSpeed', "For #{template}: #{coil_cooling_dx_two_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end
@@ -86,7 +86,7 @@ def coil_cooling_dx_two_speed_standard_minimum_cop(coil_cooling_dx_two_speed, re
     # If specified as EER (heat pump)
     unless ac_props['minimum_full_load_efficiency'].nil?
       min_eer = ac_props['minimum_full_load_efficiency']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_cooling_dx_two_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingDXTwoSpeed', "For #{template}: #{coil_cooling_dx_two_speed.name}: #{cooling_type} #{heating_type} #{sub_category} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end

lib/openstudio-standards/standards/Standards.CoilCoolingWaterToAirHeatPumpEquationFit.rb

@@ -61,7 +61,7 @@ def coil_cooling_water_to_air_heat_pump_standard_minimum_cop(coil_cooling_water_
     # If specified as EER (heat pump)
     unless coil_props['minimum_full_load_efficiency'].nil?
       min_eer = coil_props['minimum_full_load_efficiency']
-      cop = eer_to_cop(min_eer, capacity_w = nil)
+      cop = eer_to_cop_no_fan(min_eer, capacity_w = nil)
       new_comp_name = "#{coil_cooling_water_to_air_heat_pump.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilCoolingWaterToAirHeatPumpEquationFit', "For #{template}: #{coil_cooling_water_to_air_heat_pump.name}: Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end

lib/openstudio-standards/standards/Standards.CoilHeatingDXMultiSpeed.rb

@@ -173,7 +173,7 @@ def coil_heating_dx_multi_speed_apply_efficiency_and_curves(coil_heating_dx_mult
     # If specified as EER
     unless hp_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = hp_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       coil_heating_dx_multi_speed.setName("#{coil_heating_dx_multi_speed.name} #{capacity_kbtu_per_hr.round}kBtu/hr #{min_eer}EER")
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilHeatingDXMultiSpeed', "For #{template}: #{coil_heating_dx_multi_speed.name}:  #{suppl_heating_type} #{subcategory} Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end

lib/openstudio-standards/standards/Standards.CoilHeatingDXSingleSpeed.rb

@@ -164,7 +164,7 @@ def coil_heating_dx_single_speed_standard_minimum_cop(coil_heating_dx_single_spe
     # If specified as EER
     unless ac_props['minimum_energy_efficiency_ratio'].nil?
       min_eer = ac_props['minimum_energy_efficiency_ratio']
-      cop = eer_to_cop(min_eer)
+      cop = eer_to_cop_no_fan(min_eer)
       new_comp_name = "#{coil_heating_dx_single_speed.name} #{capacity_kbtu_per_hr.round} Clg kBtu/hr #{min_eer.round(1)}EER"
       OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.CoilHeatingDXSingleSpeed', "For #{template}: #{coil_heating_dx_single_speed.name}:  #{suppl_heating_type} #{sub_category} Cooling Capacity = #{capacity_kbtu_per_hr.round}kBtu/hr; EER = #{min_eer}")
     end