Standards.HeatExchangerSensLat.rb in openstudio-standards-0.6.3

- old
+ new

@@ -9,16 +9,23 @@
     # Assumed to be sensible and latent at all flow
     full_htg_sens_eff, full_htg_lat_eff, part_htg_sens_eff, part_htg_lat_eff, full_cool_sens_eff, full_cool_lat_eff, part_cool_sens_eff, part_cool_lat_eff = heat_exchanger_air_to_air_sensible_and_latent_minimum_effectiveness(heat_exchanger_air_to_air_sensible_and_latent)
 
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100HeatingAirFlow(full_htg_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100HeatingAirFlow(full_htg_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat100CoolingAirFlow(full_cool_sens_eff)
     heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat100CoolingAirFlow(full_cool_lat_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
-    heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    if heat_exchanger_air_to_air_sensible_and_latent.model.version < OpenStudio::VersionString.new('3.8.0')
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff)
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff)
+    else
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75HeatingAirFlow(part_htg_sens_eff) unless part_htg_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75HeatingAirFlow(part_htg_lat_eff) unless part_htg_lat_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setSensibleEffectivenessat75CoolingAirFlow(part_cool_sens_eff) unless part_cool_sens_eff.zero?
+      heat_exchanger_air_to_air_sensible_and_latent.setLatentEffectivenessat75CoolingAirFlow(part_cool_lat_eff) unless part_cool_lat_eff.zero?
+    end
 
     OpenStudio.logFree(OpenStudio::Info, 'openstudio.standards.HeatExchangerSensLat', "For #{heat_exchanger_air_to_air_sensible_and_latent.name}: Set sensible and latent effectiveness.")
 
     return true
   end
@@ -66,25 +73,25 @@
   # @param design_conditions [String] design_conditions for effectiveness calculation, either 'cooling' or 'heating'
   # @return [Array] heating and cooling heat exchanger effectiveness at 100% and 75% nominal airflow
   def heat_exchanger_air_to_air_sensible_and_latent_enthalpy_recovery_ratio_to_effectiveness(enthalpy_recovery_ratio, design_conditions)
     case design_conditions
       when 'cooling'
-        full_htg_sens_eff = (20.707 * enthalpy_recovery_ratio**2 + 41.354 * enthalpy_recovery_ratio + 40.755) / 100
-        full_htg_lat_eff = (127.45 * enthalpy_recovery_ratio - 18.625) / 100
-        part_htg_sens_eff = (-0.1214 * enthalpy_recovery_ratio + 1.111) * full_htg_sens_eff
-        part_htg_lat_eff = (-0.3405 * enthalpy_recovery_ratio + 1.2732) * full_htg_lat_eff
-        full_cool_sens_eff = (70.689 * enthalpy_recovery_ratio + 30.789) / 100
-        full_cool_lat_eff = (48.054 * enthalpy_recovery_ratio**2 + 83.082 * enthalpy_recovery_ratio - 12.881) / 100
-        part_cool_sens_eff = (-0.1214 * enthalpy_recovery_ratio + 1.111) * full_cool_sens_eff
-        part_cool_lat_eff = (-0.3982 * enthalpy_recovery_ratio  + 1.3151) * full_cool_lat_eff
+        full_htg_sens_eff = ((20.707 * (enthalpy_recovery_ratio**2)) + (41.354 * enthalpy_recovery_ratio) + 40.755) / 100
+        full_htg_lat_eff = ((127.45 * enthalpy_recovery_ratio) - 18.625) / 100
+        part_htg_sens_eff = ((-0.1214 * enthalpy_recovery_ratio) + 1.111) * full_htg_sens_eff
+        part_htg_lat_eff = ((-0.3405 * enthalpy_recovery_ratio) + 1.2732) * full_htg_lat_eff
+        full_cool_sens_eff = ((70.689 * enthalpy_recovery_ratio) + 30.789) / 100
+        full_cool_lat_eff = ((48.054 * (enthalpy_recovery_ratio**2)) + (83.082 * enthalpy_recovery_ratio) - 12.881) / 100
+        part_cool_sens_eff = ((-0.1214 * enthalpy_recovery_ratio) + 1.111) * full_cool_sens_eff
+        part_cool_lat_eff = ((-0.3982 * enthalpy_recovery_ratio)  + 1.3151) * full_cool_lat_eff
       when 'heating'
         full_htg_sens_eff = enthalpy_recovery_ratio
         full_htg_lat_eff = 0.0
-        part_htg_sens_eff = (-0.1214 * enthalpy_recovery_ratio + 1.111) * full_htg_sens_eff
+        part_htg_sens_eff = ((-0.1214 * enthalpy_recovery_ratio) + 1.111) * full_htg_sens_eff
         part_htg_lat_eff = 0.0
-        full_cool_sens_eff = enthalpy_recovery_ratio * (70.689 * enthalpy_recovery_ratio + 30.789) / (20.707 * enthalpy_recovery_ratio**2 + 41.354 * enthalpy_recovery_ratio + 40.755)
+        full_cool_sens_eff = enthalpy_recovery_ratio * ((70.689 * enthalpy_recovery_ratio) + 30.789) / ((20.707 * (enthalpy_recovery_ratio**2)) + (41.354 * enthalpy_recovery_ratio) + 40.755)
         full_cool_lat_eff = 0.0
-        part_cool_sens_eff = (-0.1214 * enthalpy_recovery_ratio + 1.111) * full_cool_sens_eff
+        part_cool_sens_eff = ((-0.1214 * enthalpy_recovery_ratio) + 1.111) * full_cool_sens_eff
         part_cool_lat_eff = 0.0
     end
 
     return full_htg_sens_eff, full_htg_lat_eff, part_htg_sens_eff, part_htg_lat_eff, full_cool_sens_eff, full_cool_lat_eff, part_cool_sens_eff, part_cool_lat_eff
   end