hub/catalog_factories/data_models/usages/domestic_hot_water.py

@@ -14,8 +14,9 @@ class DomesticHotWater:
   """
   DomesticHotWater class
   """
-  def __init__(self, density, service_temperature, schedules):
+  def __init__(self, density, peak_flow, service_temperature, schedules):
     self._density = density
+    self._peak_flow = peak_flow
     self._service_temperature = service_temperature
     self._schedules = schedules
 
@@ -27,6 +28,14 @@ class DomesticHotWater:
     """
     return self._density
 
+  @property
+  def peak_flow(self) -> Union[None, float]:
+    """
+    Get domestic hot water peak_flow density in m3 per second and m2
+    :return: None or float
+    """
+    return self._peak_flow
+
   @property
   def service_temperature(self) -> Union[None, float]:
     """

hub/catalog_factories/usage/comnet_catalog.py

@@ -104,6 +104,7 @@ class ComnetCatalog(Catalog):
       density = float(density) * cte.BTU_H_TO_WATTS * occupancy_density
       domestic_hot_water_service_temperature = self._schedules[schedule_name]['WtrHtrSetPt'][0].values[0]
       domestic_hot_water = DomesticHotWater(density,
+                                            None,
                                             domestic_hot_water_service_temperature,
                                             self._schedules[schedule_name]['Service Hot Water']
                                             )

hub/catalog_factories/usage/nrcan_catalog.py

@@ -79,10 +79,8 @@ class NrcanCatalog(Catalog):
     url = f'{self._base_url}{name["space_types_location"]}'
     with urllib.request.urlopen(url) as json_file:
       space_types = json.load(json_file)['tables']['space_types']['table']
-#    space_types = [st for st in space_types if st['building_type'] == 'Space Function']
     space_types = [st for st in space_types if st['space_type'] == 'WholeBuilding']
     for space_type in space_types:
-#      usage_type = space_type['space_type']
       usage_type = space_type['building_type']
       occupancy_schedule_name = space_type['occupancy_schedule']
       lighting_schedule_name = space_type['lighting_schedule']
@@ -127,14 +125,10 @@ class NrcanCatalog(Catalog):
       if appliances_radiative_fraction is not None and appliances_latent_fraction is not None:
         appliances_convective_fraction = 1 - appliances_radiative_fraction - appliances_latent_fraction
 
-      # peak flow in m3/day/m2
+      # peak flow in gallons/h/ft2
-      domestic_hot_water_peak_flow = space_type['service_water_heating_peak_flow_per_area']
+      domestic_hot_water_peak_flow = space_type['service_water_heating_peak_flow_per_area'] \
+                                     * cte.GALLONS_TO_QUBIC_METERS / cte.HOUR_TO_SECONDS * pow(cte.METERS_TO_FEET, 2)
       domestic_hot_water_service_temperature = space_type['service_water_heating_target_temperature']
-      average_domestic_hot_water_inlet_temperature = 16.5
-      # result in W/m2
-      domestic_hot_water_density = domestic_hot_water_peak_flow / 24 / 3.6 * 4184 \
-                                   * (domestic_hot_water_service_temperature -
-                                      average_domestic_hot_water_inlet_temperature)
 
       occupancy = Occupancy(occupancy_density,
                             None,
@@ -157,7 +151,8 @@ class NrcanCatalog(Catalog):
                                        hvac_availability,
                                        heating_schedule,
                                        cooling_schedule)
-      domestic_hot_water = DomesticHotWater(domestic_hot_water_density,
+      domestic_hot_water = DomesticHotWater(None,
+                                            domestic_hot_water_peak_flow,
                                             domestic_hot_water_service_temperature,
                                             domestic_hot_water_load_schedule)
 

hub/city_model_structure/building_demand/domestic_hot_water.py

@@ -14,6 +14,7 @@ class DomesticHotWater:
   """
   def __init__(self):
     self._density = None
+    self._peak_flow = None
     self._service_temperature = None
     self._schedules = None
 
@@ -34,6 +35,22 @@ class DomesticHotWater:
     if value is not None:
       self._density = float(value)
 
+  @property
+  def peak_flow(self) -> Union[None, float]:
+    """
+    Get domestic hot water peak_flow density in m3 per second and m2
+    :return: None or float
+    """
+    return self._peak_flow
+
+  @peak_flow.setter
+  def peak_flow(self, value):
+    """
+    Set domestic hot water peak_flow density in m3 per second and m2
+    :return: None or float
+    """
+    self._peak_flow = value
+
   @property
   def service_temperature(self) -> Union[None, float]:
     """

hub/city_model_structure/city_object.py

@@ -35,6 +35,7 @@ class CityObject:
     self._max_z = ConfigurationHelper().min_coordinate
     self._centroid = None
     self._external_temperature = dict()
+    self._ground_temperature = dict()
     self._global_horizontal = dict()
     self._diffuse = dict()
     self._beam = dict()
@@ -158,6 +159,24 @@ class CityObject:
     """
     self._external_temperature = value
 
+  # todo: this is the new format we will use to get rid of the data frames
+  @property
+  def ground_temperature(self) -> dict:
+    """
+    Get ground temperature under the city object in Celsius at different depths in meters for different time steps
+    example of use: {month: {0.5: [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]}}
+    :return: dict{dict{[float]}}
+    """
+    return self._ground_temperature
+
+  @ground_temperature.setter
+  def ground_temperature(self, value):
+    """
+    Set ground temperature under the city object in Celsius at different depths
+    :param value: dict{dict{[float]}}
+    """
+    self._ground_temperature = value
+
   @property
   def global_horizontal(self) -> dict:
     """

hub/config/configuration.ini

@@ -17,4 +17,6 @@ convective_heat_transfer_coefficient_exterior = 20
 #W/mK
 soil_conductivity = 3
 #m
-soil_thickness = 0.5
+soil_thickness = 0.5
+#C
+cold_water_temperature = 10

hub/helpers/configuration_helper.py

@@ -138,3 +138,11 @@ class ConfigurationHelper:
     :return: 0.5
     """
     return self._config.getfloat('buildings', 'soil_thickness').real
+
+  @property
+  def cold_water_temperature(self) -> float:
+    """
+    Get configured cold water temperature in Celsius
+    :return: 10
+    """
+    return self._config.getfloat('buildings', 'cold_water_temperature').real

hub/helpers/constants.py

@@ -8,13 +8,17 @@ Project Coder Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
 # universal constants
 
 KELVIN = 273.15
+WATER_DENSITY = 1000
+WATER_HEAT_CAPACITY = 4182
 
 # converters
 HOUR_TO_MINUTES = 60
 MINUTES_TO_SECONDS = 60
+HOUR_TO_SECONDS = 3600
 METERS_TO_FEET = 3.28084
 BTU_H_TO_WATTS = 0.29307107
 KILO_WATTS_HOUR_TO_JULES = 3600000
+GALLONS_TO_QUBIC_METERS = 0.0037854117954011185
 
 # time
 SECOND = 'second'

hub/imports/usage/comnet_usage_parameters.py

@@ -19,6 +19,7 @@ from hub.city_model_structure.building_demand.domestic_hot_water import Domestic
 from hub.city_model_structure.attributes.schedule import Schedule
 from hub.city_model_structure.building_demand.internal_gain import InternalGain
 from hub.catalog_factories.usage_catalog_factory import UsageCatalogFactory
+from hub.imports.usage.usage_helper import UsageHelper
 
 
 class ComnetUsageParameters:
@@ -55,7 +56,7 @@ class ComnetUsageParameters:
         volume_per_area = internal_zone.volume / internal_zone.area
         usage = Usage()
         usage.name = usage_name
-        self._assign_values(usage, archetype_usage, volume_per_area)
+        self._assign_values(usage, archetype_usage, volume_per_area, building.ground_temperature)
         usage.percentage = 1
         self._calculate_reduced_values_from_extended_library(usage, archetype_usage)
 
@@ -70,7 +71,7 @@ class ComnetUsageParameters:
     raise KeyError('archetype not found')
 
   @staticmethod
-  def _assign_values(usage, archetype, volume_per_area):
+  def _assign_values(usage, archetype, volume_per_area, ground_temperature):
     # Due to the fact that python is not a typed language, the wrong object type is assigned to
     # usage.occupancy when writing usage.occupancy = archetype.occupancy.
     # Same happens for lighting and appliances. Therefore, this walk around has been done.
@@ -105,6 +106,12 @@ class ComnetUsageParameters:
     _domestic_hot_water = DomesticHotWater()
     _domestic_hot_water.density = archetype.domestic_hot_water.density
     _domestic_hot_water.service_temperature = archetype.domestic_hot_water.service_temperature
+    cold_temperature = UsageHelper().cold_water_temperature(ground_temperature)
+    peak_flow = 0
+    if (archetype.domestic_hot_water.service_temperature - cold_temperature) > 0:
+      peak_flow = archetype.domestic_hot_water.density / cte.WATER_DENSITY / cte.WATER_HEAT_CAPACITY \
+                  / (archetype.domestic_hot_water.service_temperature - cold_temperature)
+    _domestic_hot_water.peak_flow = peak_flow
     _domestic_hot_water.schedules = archetype.domestic_hot_water.schedules
     usage.domestic_hot_water = _domestic_hot_water
 

hub/imports/usage/nrcan_usage_parameters.py

@@ -16,6 +16,7 @@ from hub.city_model_structure.building_demand.appliances import Appliances
 from hub.city_model_structure.building_demand.thermal_control import ThermalControl
 from hub.city_model_structure.building_demand.domestic_hot_water import DomesticHotWater
 from hub.catalog_factories.usage_catalog_factory import UsageCatalogFactory
+from hub.imports.usage.usage_helper import UsageHelper
 
 
 class NrcanUsageParameters:
@@ -62,7 +63,7 @@ class NrcanUsageParameters:
         volume_per_area = internal_zone.volume / internal_zone.area
         usage = Usage()
         usage.name = usage_name
-        self._assign_values(usage, archetype_usage, volume_per_area)
+        self._assign_values(usage, archetype_usage, volume_per_area, building.ground_temperature)
         self._assign_comnet_extra_values(usage, comnet_archetype_usage)
         usage.percentage = 1
         self._calculate_reduced_values_from_extended_library(usage, archetype_usage)
@@ -78,7 +79,7 @@ class NrcanUsageParameters:
     raise KeyError('archetype not found')
 
   @staticmethod
-  def _assign_values(usage, archetype, volume_per_area):
+  def _assign_values(usage, archetype, volume_per_area, ground_temperature):
     if archetype.mechanical_air_change > 0:
       usage.mechanical_air_change = archetype.mechanical_air_change
     elif archetype.ventilation_rate > 0:
@@ -113,8 +114,11 @@ class NrcanUsageParameters:
     _control.hvac_availability_schedules = archetype.thermal_control.hvac_availability_schedules
     usage.thermal_control = _control
     _domestic_hot_water = DomesticHotWater()
-    _domestic_hot_water.density = archetype.domestic_hot_water.density
+    _domestic_hot_water.peak_flow = archetype.domestic_hot_water.peak_flow
     _domestic_hot_water.service_temperature = archetype.domestic_hot_water.service_temperature
+    cold_temperature = UsageHelper().cold_water_temperature(ground_temperature)
+    _domestic_hot_water.density = archetype.domestic_hot_water.peak_flow * cte.WATER_DENSITY * cte.WATER_HEAT_CAPACITY \
+                                  * (archetype.domestic_hot_water.service_temperature - cold_temperature)
     _domestic_hot_water.schedules = archetype.domestic_hot_water.schedules
     usage.domestic_hot_water = _domestic_hot_water
 

hub/imports/usage/usage_helper.py

@@ -0,0 +1,43 @@
+"""
+Usage helper
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2023 Concordia CERC group
+Project Coder Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
+"""
+
+import sys
+from hub.hub_logger import logger
+import hub.helpers.constants as cte
+from hub.helpers.configuration_helper import ConfigurationHelper as ch
+
+
+class UsageHelper:
+  """
+  UsageHelper class
+  """
+
+  @staticmethod
+  def cold_water_temperature(ground_temperature):
+    keys = ground_temperature.keys()
+    depths = ground_temperature[keys[0]].keys()
+    if keys[0] == cte.YEAR:
+      # taking the deeper temperature available
+      _cold_temperature = ground_temperature[cte.YEAR][depths[len(depths-1)]]
+    elif keys[0] == cte.MONTH:
+      _cold_temperature = 0
+      for i in range(0, 12):
+        # taking the deeper temperature available
+        _cold_temperature += ground_temperature[cte.MONTH][depths[len(depths-1)]] / 12
+    elif keys[0] == cte.HOUR:
+      _cold_temperature = 0
+      for i in range(0, 8760):
+        # taking the deeper temperature available
+        _cold_temperature += ground_temperature[cte.HOUR][depths[len(depths-1)]] / 8760
+    else:
+      _cold_temperature = ch().cold_water_temperature
+      logger.error(f'Cold water temperature could not be calculated. Assigned default value = '
+                   f'{ch().cold_water_temperature} degrees Celsius\n')
+      sys.stderr.write(f'Cold water temperature could not be calculated. Assigned default value = '
+                       f'{ch().cold_water_temperature} degrees Celsius\n')
+
+    return _cold_temperature

hub/imports/weather/epw_weather_parameters.py

@@ -32,14 +32,13 @@ class EpwWeatherParameters:
         _ = file.readline().split(',')
       line = file.readline().split(',')
       number_records = int(line[1])
-      depth_measurement_ground_temperature = []
+      ground_temperature = {}
-      ground_temperature = []
       for i in range(0, number_records):
-        depth_measurement_ground_temperature.append(line[i*16+2])
+        depth_measurement_ground_temperature = line[i*16+2]
         temperatures = []
         for j in range(0, 12):
           temperatures.append(line[i*16+j+6])
-        ground_temperature.append(temperatures)
+        ground_temperature[depth_measurement_ground_temperature] = temperatures
       file.close()
     except SystemExit:
       sys.stderr.write(f'Error: weather file {self._path} not found. Please download it from '
@@ -74,6 +73,7 @@ class EpwWeatherParameters:
       sys.exit()
 
     for building in self._city.buildings:
+      building.ground_temperature[cte.MONTH] = ground_temperature
       if cte.HOUR in building.external_temperature:
         del building.external_temperature[cte.HOUR]
       new_value = pd.DataFrame(self._weather_values[['dry_bulb_temperature_c']].to_numpy(), columns=['epw'])