from recommendations.Costs import Costs, BOILER_UPGRADE_SCHEME_ASHP_VALUE from recommendations.recommendation_utils import ( check_simulation_difference, override_costs, combine_recommendation_configs ) from backend.Property import Property from backend.app.plan.schemas import MEASURE_MAP from etl.epc_clean.epc_attributes.MainheatAttributes import MainHeatAttributes from etl.epc_clean.epc_attributes.HotWaterAttributes import HotWaterAttributes from etl.epc_clean.epc_attributes.MainFuelAttributes import MainFuelAttributes from recommendations.HeatingControlRecommender import HeatingControlRecommender class HeatingRecommender: high_heat_retention_contols_desc = "Controls for high heat retention storage heaters" DUAL_HEATING_DESCRIPTIONS = { "Boiler and radiators, mains gas, electric storage heaters": { "hhr": { "mainheating_description": "Boiler and radiators, mains gas, Electric storage heaters", "recommendation_description": "Install high heat retention electric storage heaters alongside the " "boiler. The current electric heaters may be retrofit with high heat " "retention storage controls" " however this is dependent on the existing system and may not be " "possible.", "controls_prefix": "current_controls" }, "boiler": { "mainheating_description": "Boiler and radiators, mains gas, electric storage heaters", "recommendation_description": "Upgrade the existing boiler to a new, more efficient condensing " "boiler. ", "controls_suffix": "Manual charge controls" }, # These are the heating types we need to produce a dual heating recommendation "dual": { "recommendation_description": "Upgrade both the existing boiler to a new condensing boiler and" " upgrade storage heaters to high heat retention storage heaters.", "types": [ # type 1 "boiler_upgrade", # type 2 "high_heat_retention_storage_heater", ] } }, "Portable electric heaters assumed for most rooms, room heaters, electric": { "hhr": { "mainheating_description": "Electric storage heaters, radiators", "recommendation_description": "Install high heat retention electric storage heaters.", "controls_prefix": "" }, "boiler": { "mainheating_description": "Boiler and radiators, mains gas", "recommendation_description": "Upgrade to a new condensing boiler.", "controls_suffix": "" }, # These are the heating types we need to produce a dual heating recommendation "dual": None } } def __init__(self, property_instance: Property): self.property = property_instance self.costs = Costs(self.property) self.heating_recommendations = [] self.heating_control_recommendations = [] self.has_electric_heating_description = ( self.property.main_heating["has_electric"] or self.property.main_heating["has_electricaire"] ) self.has_ashp = self.property.main_heating["has_air_source_heat_pump"] self.has_room_heaters = ( self.property.main_heating["has_room_heaters"] or self.property.main_heating["has_portable_electric_heaters"] ) self.has_boiler = self.property.main_heating["has_boiler"] self.dual_heating = self.identify_dual_heating() def identify_dual_heating(self): # All heat systems are in here so we identify whether two of these are true # MainHeatAttributes.HEAT_SYSTEMS n_trues = 0 for heat_system in MainHeatAttributes.HEAT_SYSTEMS: if self.property.main_heating[f"has_{heat_system.replace(' ', '_')}"]: n_trues += 1 if n_trues > 2 or n_trues == 0: raise Exception("Implement me") if n_trues == 1: return False return True def is_high_heat_retention_valid(self, ashp_only_heating_recommendation, measures): """ Check conditions if high heat retention storage is valid If there's already an ASHP in place, we don't recommend HHR :return: """ # We can also recommend hhr if the property doesn't have a mains has connection no_mains = not self.property.data["mains-gas-flag"] # If the property already has room heaters then we recommend HHR as an option since the home already has # a variation of room heaters hhr_suitable = no_mains or self.has_electric_heating_description or self.has_room_heaters return ( hhr_suitable and (not ashp_only_heating_recommendation) and not self.has_ashp and ("high_heat_retention_storage_heater" in measures) ) def is_boiler_upgrade_suitable(self, measures, ashp_only_heating_recommendation): """ These are the conditions we apply to recommend a boiler installation :return: """ # 1) if the property has mains heating with boiler and radiators, we recommend optimal heating controls # If it's NOT a gas boiler, we'll potentially recommend a boiler has_gas_boiler = self.has_boiler and self.property.main_heating["has_mains_gas"] # 2) If the property doesn't have a heating system, but it has access to the mains gas no_heating_has_mains = self.property.main_heating["clean_description"] in [ 'No system present, electric heaters assumed' ] and self.property.data["mains-gas-flag"] # The property is using portable heaters and has access to gas mains has_room_heaters = self.has_room_heaters and self.property.data["mains-gas-flag"] # We also check if the property has electric heating, but it has access to the mains gas electic_heating_has_mains = self.has_electric_heating_description and self.property.data["mains-gas-flag"] portable_heaters_has_mains = ( self.property.main_heating["has_portable_electric_heaters"] and self.property.data["mains-gas-flag"] ) # The next condition is if the home has a non-gas boiler, such as an oil boiler, with a mains gas connection non_gas_boiler = ( self.property.main_heating["has_boiler"] and not self.property.main_heating["has_mains_gas"] and self.property.data["mains-gas-flag"] ) # Additionally, if the property has a gas connection, is using gas heating but doesn't have a boiler, # we recommend a boiler non_boiler_gas_heating = ( self.property.data["mains-gas-flag"] and self.property.main_heating["has_mains_gas"] and not self.property.main_heating["has_boiler"] ) is_valid = ( ( has_gas_boiler or no_heating_has_mains or electic_heating_has_mains or has_room_heaters or portable_heaters_has_mains or non_gas_boiler or non_boiler_gas_heating ) and (not ashp_only_heating_recommendation) and ("boiler_upgrade" in measures) and (not self.has_ashp) ) return is_valid, has_gas_boiler def recommend_dual_heating(self): if self.property.main_heating["clean_description"] not in self.DUAL_HEATING_DESCRIPTIONS: return # if we have set dual to None, we do not produce a dual heating recommendation if self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["dual"] is None: return dual_heating_description = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["dual"]["types"] recommendation_system_types = list(set([x["system_type"] for x in self.heating_recommendations])) # We check if we have the required type if not any([x in recommendation_system_types for x in dual_heating_description]): return type_1_recommendations = [ x for x in self.heating_recommendations if x["system_type"] == dual_heating_description[0] ] type_2_recommendations = [ x for x in self.heating_recommendations if x["system_type"] == dual_heating_description[1] ] # we combine the two recommendations combined_recommendations = [] for rec in type_1_recommendations: for rec2 in type_2_recommendations: combined_rec = rec.copy() # Update the description combined_rec["description"] = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["dual"]["recommendation_description"] # Combine simulation_config # Make sure we end up with the best efficiecy values combined_rec["simulation_config"] = combine_recommendation_configs( rec["simulation_config"], rec2["simulation_config"] ) # Combine description_simulation combined_rec["description_simulation"] = combine_recommendation_configs( rec["description_simulation"], rec2["description_simulation"] ) # Combine costs for k in ["total", "subtotal", "vat", "labour_hours", "labour_days"]: combined_rec[k] = rec[k] + rec2[k] combined_rec["measure_type"] = "+".join([rec["measure_type"], rec2["measure_type"]]) combined_recommendations.append(combined_rec) self.heating_recommendations.extend(combined_recommendations) def recommend(self, has_cavity_or_loft_recommendations, phase=0, measures=None): """ Produces heating recommendations :param has_cavity_or_loft_recommendations: boolean indicating if we have produced a cavity or loft insulation recommendation. If there are cavity or loft recommendations, the property would need to complete those measures before being able to get the boiler upgrade scheme benefits. The messaging in the front end would be to :param phase: indicates the phase of the retrofit programme :param measures: A list of measures for the recommendations """ measures = MEASURE_MAP["heating"] if measures is None else measures # TODO: We could have a system flush recommendation for an existing boiler, where there is no need to replace # the boiler, but instead flushing the system will make it run more efficiently. There is a cost for this # in the Costs class, stored as SYSTEM_FLUSH_COST # TODO: Right now, we don't have recommendations for electric boilers - we should probably have one # if we have a non-invasive ashp recommendation, we get the configuration directly from the property instance non_invasive_ashp_recommendation = next( (r for r in self.property.non_invasive_recommendations if r["type"] == "air_source_heat_pump"), {"suitable": True} ) # We allow for the non-invasive recommendation to be that ASHP is not suitable # This option will prevent other heating recommendations from being specified, other than an ASHP ashp_only_heating_recommendation = non_invasive_ashp_recommendation.get( "ashp_only_heating_recommendation", False ) self.heating_recommendations = [] self.heating_control_recommendations = [] # This first iteration of the recommender will provide very basic recommendation # We recommend heating controls based on the main heating system hhr_valid = self.is_high_heat_retention_valid(ashp_only_heating_recommendation, measures) if hhr_valid: # Recommend high heat retention storage heaters self.recommend_hhr_storage_heaters(phase=phase, system_change=True, heating_controls_only=False) gas_boiler_suitable, has_gas_boiler = self.is_boiler_upgrade_suitable( measures=measures, ashp_only_heating_recommendation=ashp_only_heating_recommendation ) if gas_boiler_suitable: # This indicates that the home previously did not have a boiler in place and so would require # an overhaul to the system - right now, this is all reasons, apart from if there is an existing boiler system_change = not has_gas_boiler exising_room_heaters = self.property.main_heating["has_room_heaters"] self.recommend_boiler_upgrades( phase=phase, system_change=system_change, exising_room_heaters=exising_room_heaters ) # If we have dual heating and we allow for a combined recommendation, to upgrade both systems if self.dual_heating: self.recommend_dual_heating() # We recommend air source heat pumps # Heat pumps are suitable for all property types: # https://energysavingtrust.org.uk/from-flats-to-terraced-houses-heat-pumps-are-suitable-for-all-property-types/ # Just seems least probable for flats, so we'll allow houses and bungalows # In the future, we'll allow overrides, so that non-intrusive surveys can contradict these conditions # and either allow or prevent the recommendation of an air source heat pump if ( self.property.is_ashp_valid(measures=measures) and non_invasive_ashp_recommendation["suitable"] and not self.has_ashp ): self.recommend_air_source_heat_pump( phase=phase, has_cavity_or_loft_recommendations=has_cavity_or_loft_recommendations, ) return def recommend_electric_boiler_upgrade(self, phase): # Small initial scope, just handles the case of properties that have electric boilers where the efficiency # is poor or very poor # We recommend upgrading to a new electric boiler recommendation_phase = phase if self.property.data["mainheat-energy-eff"] not in ["Poor", "Very Poor"]: return hotwater_from_mains = self.property.hotwater["clean_description"] in ["From main system"] hotwater_from_cylinder = self.property.hotwater["clean_description"] in [ "From main system, no cylinder thermostat" ] # if the hotwater is from the mains, we probably have a combi boiler so we recommend a new electric boiler if hotwater_from_mains: description = f"Upgrade to a higher efficiency electric boiler" simulation_config = { "mainheat_energy_eff_ending": "Average", "hot_water_energy_eff_ending": "Average" } boiler_costs = self.costs.boiler( size=None, exising_room_heaters=False, system_change=False, n_heated_rooms=self.property.data["number-heated-rooms"], n_rooms=self.property.number_of_rooms, is_electric=True ) already_installed = "heating" in self.property.already_installed if already_installed: boiler_costs = override_costs(boiler_costs) description = "Heating system has already been upgraded, no further action needed." boiler_recommendation = { "phase": recommendation_phase, "parts": [], "type": "heating", "description": description, "starting_u_value": None, "new_u_value": None, "sap_points": None, "already_installed": already_installed, "simulation_config": simulation_config, **boiler_costs } controls_recommender = HeatingControlRecommender(self.property) controls_recommender.recommend(heating_description="Boiler and radiators, electric") self.heating_recommendations.extend([boiler_recommendation] + controls_recommender.recommendation) return if hotwater_from_cylinder: # We recommend a change from a system boiler, with a cylinder to a combi boiler description = ("Replace the existing boiler and cylinder without a thermostat with a new electric combi " "boiler") def recommend_air_source_heat_pump(self, phase, has_cavity_or_loft_recommendations, _return=False): """ This method will implement the recommendation for an air source heat pump This is ultimately an overhaul to the heating system and so is recommended as an alternative to other heating system recommendations :return: """ # Look for a non-intrusive recommendation non_intrusive_recommendation = next(( r for r in self.property.non_invasive_recommendations if r["type"] == "air_source_heat_pump" ), {}) controls_recommender = HeatingControlRecommender(self.property) controls_recommender.recommend(heating_description="Air source heat pump, radiators, electric") ashp_costs = self.costs.air_source_heat_pump() if non_intrusive_recommendation: # Update with non-intrusive recommendation if non_intrusive_recommendation.get("cost"): ashp_costs.update( {"total": non_intrusive_recommendation["cost"], "subtotal": None, "vat": None} ) already_installed = "air_source_heat_pump" in self.property.already_installed controls_recommendations = controls_recommender.recommendation if already_installed or not controls_recommendations: # We set an empty object, so we just produce one recommendation controls_recommendations = [None] if already_installed: ashp_costs = override_costs(ashp_costs) if non_intrusive_recommendation and not all([x is None for x in controls_recommendations]): # We just use the ttzc control controls_recommendations = [ x for x in controls_recommendations if ( x["description_simulation"]["mainheatcont-description"] == "Time and temperature zone control" ) ] # This is a map from the heating controls description to the description of the air source heat pump set up ashp_descriptions = { "Time and temperature zone control": ( "Install an air source heat pump, and upgrade heating controls to Smart Thermostats, " "room sensors and smart radiator valves (time & temperature zone control)." ), "Programmer, TRVs and bypass": ( "Install an air source heat pump, with programmer, TRVs and a Bypass valve." ), } new_heating_description = "Air source heat pump, radiators, electric" new_hot_water_description = "From main system" ashp_recommendations = [] for controls_rec in controls_recommendations: ashp_costs_with_controls = ashp_costs.copy() if controls_rec: for key in ashp_costs_with_controls: if ashp_costs_with_controls[key] is not None: ashp_costs_with_controls[key] += controls_rec[key] if controls_rec is None: description = "Install a Mitsubish air source heat pump." elif already_installed: description = "The property already has an air source heat pump, no further action needed." else: description = ashp_descriptions[controls_rec["description_simulation"]["mainheatcont-description"]] # If the property does not have existing cavity and loft insulation, we include a note that the cost # includes the boiler upgrade scheme and that the cavity and loft need to be treated, to ensure access # to the funding if not non_intrusive_recommendation: if has_cavity_or_loft_recommendations: description = description + ( f" The cost includes the £" f"{BOILER_UPGRADE_SCHEME_ASHP_VALUE} boiler upgrade scheme grant. " f"You must ensure that the property has an insulated cavity and " f"270mm+ loft insulation to qualify for the grant" ) else: description = description + ( f" The cost includes the £{BOILER_UPGRADE_SCHEME_ASHP_VALUE} boiler upgrade scheme grant" ) simulation_config = { "mainheat_energy_eff_ending": "Very Good", "hot_water_energy_eff_ending": "Very Good" } description_simulation = { "mainheat-description": new_heating_description, "mainheat-energy-eff": simulation_config["mainheat_energy_eff_ending"], "hot-water-energy-eff": simulation_config["hot_water_energy_eff_ending"], "hotwater-description": new_hot_water_description, } # Installation of a boiler improves the hot water system so we need to reflect this in # the outcome of the recommendation heating_ending_config = MainHeatAttributes(new_heating_description).process() hotwater_ending_config = HotWaterAttributes(new_hot_water_description).process() # If the property does not currently have electric main fuel, we'll simulate the change fuel_ending_config = {} if self.property.main_fuel["fuel_type"] != "electricity": new_fuel_description = "electricity (not community)" fuel_ending_config = MainFuelAttributes(new_fuel_description).process() description_simulation = { **description_simulation, "main-fuel": new_fuel_description } # Check the simulation differences heating_simulation_config = check_simulation_difference( new_config=heating_ending_config, old_config=self.property.main_heating ) hotwater_simulation_config = check_simulation_difference( new_config=hotwater_ending_config, old_config=self.property.hotwater ) fuel_simulation_config = check_simulation_difference( new_config=fuel_ending_config, old_config=self.property.main_fuel ) simulation_config = { **simulation_config, **heating_simulation_config, **hotwater_simulation_config, **fuel_simulation_config, } if controls_rec is not None: # We should have just the single recommendation for heat controls, which is time # and temperature zone controls simulation_config = { **simulation_config, **controls_rec["simulation_config"] } description_simulation = { **description_simulation, **controls_rec["description_simulation"] } ashp_recommendation = { "phase": phase, "parts": [], "type": "heating", "measure_type": "air_source_heat_pump", "description": description, "starting_u_value": None, "new_u_value": None, "sap_points": None, "already_installed": already_installed, "simulation_config": simulation_config, "description_simulation": description_simulation, **ashp_costs_with_controls } ashp_recommendations.append(ashp_recommendation) if _return: return [ashp_recommendations] self.heating_recommendations.extend(ashp_recommendations) @staticmethod def check_simulation_difference(old_config, new_config): """ Given two dictionaries, that describe the heating control configurations, this method will compare the two and pick out the differences. These differences will be things that have been added and things that have been removed. This will be used to determine how we should be updating the configuration in the simulation :return: """ differences = {key + "_ending": new_config[key] for key in new_config if old_config[key] != new_config[key]} return differences def combine_heating_and_controls( self, controls_recommendations, heating_simulation_config, heating_description_simulation, costs, description, phase, heating_controls_only, system_change, system_type, measure_type ): """ Given a recommendation for heating controls, and a recommendation for the heating system, we combine the two into a single recommendation :param controls_recommendations: The heating controls recommendations :param heating_simulation_config: The simulation configuration for the heating system :param heating_description_simulation: The simulation configuration for the heating description :param costs: The costs of the heating system :param description: The description of the recommendation :param phase: The phase of the recommendation :param heating_controls_only: If True, we will also add a recommendation for heating controls only :param system_change: Indicates if we are recommending a different type of heating system, compared to the current system. If we have a system change and we have a heat control recommendation, we only recommend both heating and controls together :param system_type: The type of heating system we are recommending :param measure_type: The type of measure we are recommending - more granular than the "type" field, allowing us to distinguish between different types of heating recommendations """ # We produce recommendations with & without heating controls # We will also produce a recommendation for heating controls only heating_controls_switch = [True, False] if controls_recommendations else [False] if not heating_simulation_config: heating_controls_switch = [] if system_change and len(controls_recommendations): heating_controls_switch = [True] output = [] for controls_switch in heating_controls_switch: total_costs = costs.copy() recommendation_simulation_config = heating_simulation_config.copy() recommendation_description_simulation = heating_description_simulation.copy() recommendation_description = description if controls_switch: # We add the costs of the heating controls, onto each key in the costs dictionary for key in total_costs: total_costs[key] += controls_recommendations[0][key] recommendation_simulation_config = { **recommendation_simulation_config, **controls_recommendations[0]["simulation_config"] } recommendation_description_simulation = { **recommendation_description_simulation, **controls_recommendations[0]["description_simulation"] } controls_description = controls_recommendations[0]['description'] recommendation_description = f"{description} {controls_description}" already_installed = "heating_controls" in self.property.already_installed if already_installed: total_costs = override_costs(total_costs) recommendation_description = "Heating system has already been upgraded, no further action needed." recommendation = { "phase": phase, "parts": [], "type": "heating", "measure_type": measure_type, "description": recommendation_description, "starting_u_value": None, "new_u_value": None, "sap_points": None, "already_installed": already_installed, **total_costs, "simulation_config": recommendation_simulation_config, "description_simulation": recommendation_description_simulation, # We insert the heating system type here "system_type": system_type } output.append(recommendation) if heating_controls_only and len(controls_recommendations): # Also add on a recommendation for heating controls only heating_control_recommendation = controls_recommendations[0].copy() # Capitalize the first letter of the description heating_control_recommendation["description"] = ( heating_control_recommendation["description"][0].upper() + heating_control_recommendation["description"][1:] ) output.append( { "phase": phase, "parts": [ # TODO ], "type": "heating", "starting_u_value": None, "new_u_value": None, "sap_points": None, **heating_control_recommendation } ) return output def is_hhr_already_installed(self): """ Check if the property already has high heat retention storage heaters :return: """ already_has_hhr = "Electric storage heaters" in self.property.main_heating["clean_description"] # Some electric storage heaters will show that the controls are "Manual charge controls" which are indicative # of the old model of electric storage heaters, originating from 1961. # Newer HHR storage heaters will charge up over night but will retain the heat durin the day for when warmth # is actually needed, unlike traditional storage heaters that charge up at night and release heat during the day # which isn't always ideal for the occupants. already_has_hhr_contols = ( self.property.main_heating_controls[ "clean_description" ].lower() == self.high_heat_retention_contols_desc.lower() ) return already_has_hhr and already_has_hhr_contols def recommend_hhr_storage_heaters(self, phase, system_change, heating_controls_only, _return=False): """ We will recommend upgrading to a high heat retention storage system, if the current system is not already high heat retention storage If the property currently has electric storage heaters, with automatic charge control, we allow for a high heat retention stoarage heaters recommendation. This is because the automatic charge control is not the same as the high heat retention storage heaters. HHR storage heaters aren't guaranteed to be more efficient but we can at least present the option to the end user and they can decide if they want to go ahead with the recommendation or not. There's a useful guide by quidos, describing the differences between some of the different storage heater options: https://www.quidos.co.uk/wp-content/uploads/2017/04/Technical-Bulletin-010417-Storage-Heatersv2.pdf :param phase: The phase of the recommendation :param system_change: Indicates if we are recommending a different type of heating system, compared to the current system :param heating_controls_only: Indicates if we should include a recommendation for just heating controls :param _return: Indicates if we should return the recommendations, rather than appending them to the recommendations list :return: """ controls_recommender = HeatingControlRecommender(self.property) # The heating controls we're recommending for are based on the recommended heating system # We only recommend Celect-type controls if the current heating system is not Celect-type controls if self.property.main_heating_controls["clean_description"] != self.high_heat_retention_contols_desc: if self.dual_heating: controls_prefix = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["hhr"]["controls_prefix"] if controls_prefix == "current_controls": description_prefix = self.property.main_heating_controls["clean_description"] elif controls_prefix == "": description_prefix = "" else: raise NotImplementedError("Implement me") else: description_prefix = "" controls_recommender.recommend( heating_description="Electric storage heaters", description_prefix=description_prefix ) has_hhr = self.is_hhr_already_installed() # Conditions for not recommending electric storage heaters if has_hhr: # No recommendation needed return # We check if the property has dual heating in place with a boiler and storage heaters if self.dual_heating: new_heating_description = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["hhr"]["mainheating_description"] else: new_heating_description = "Electric storage heaters" # Set up artefacts, suitable for the simulation and regardless of controls heating_ending_config = MainHeatAttributes(new_heating_description).process() heating_simulation_config = check_simulation_difference( new_config=heating_ending_config, old_config=self.property.main_heating ) # This upgrade will only take the heating system to average energy efficiency if self.property.data["mainheat-energy-eff"] in ["Very Poor", "Poor"]: heating_simulation_config["mainheat_energy_eff_ending"] = "Average" else: heating_simulation_config["mainheat_energy_eff_ending"] = self.property.data["mainheat-energy-eff"] # If the property is off-gas and has no heating system in place, the number of heated rooms will actually # be 0, so we use the number of rooms as the figure number_heated_rooms = ( self.property.data["number-heated-rooms"] if self.property.data["number-heated-rooms"] > 0 else ( self.property.number_of_rooms - 1 if self.property.number_of_rooms > 1 else self.property.number_of_rooms ) ) # To be conservative, we adjust if we still have 1 room if (number_heated_rooms == 1) and (self.property.number_of_rooms > 2): number_heated_rooms = self.property.number_of_rooms - 1 # Upgrade to electric storage heaters costs = self.costs.high_heat_electric_storage_heaters( number_heated_rooms=number_heated_rooms ) if self.dual_heating: description = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["hhr"]["recommendation_description"] else: description = "Install high heat retention electric storage heaters." # We check the existing heating system and controls if ( self.property.main_heating["has_electric_storage_heaters"] and self.property.main_heating_controls["charging_system"] in ["automatic charge control", "manual charge control"] ): description += (" The current electric heaters may be retrofit with high heat retention storage controls" " however this is dependent on the existing system and may not be possible.") heating_description_simulation = { "mainheat-description": new_heating_description, "mainheat-energy-eff": heating_simulation_config["mainheat_energy_eff_ending"], } recommendations = self.combine_heating_and_controls( controls_recommendations=controls_recommender.recommendation, heating_simulation_config=heating_simulation_config, heating_description_simulation=heating_description_simulation, costs=costs, description=description, phase=phase, heating_controls_only=heating_controls_only, system_change=system_change, system_type="high_heat_retention_storage_heater", measure_type="high_heat_retention_storage_heater" ) if _return: return recommendations self.heating_recommendations.extend(recommendations) @staticmethod def estimate_boiler_size(property_type, built_form, floor_area, floor_height, num_heated_rooms): # Step 1: Base size estimation based on property type (as a starting point) base_size = { 'Flat': 25, 'House': 30, 'Maisonette': 28, 'Bungalow': 27 } # Step 2: Calculate the volume of the property volume = floor_area * floor_height # Step 3: Adjust base size for built form (to account for heat retention) form_adjustment = { 'Mid-Terrace': 0, 'End-Terrace': 2, 'Semi-Detached': 4, 'Detached': 6 } # Step 4: Further adjust for the total volume and number of heated rooms volume_adjustment = (volume / 100) # Simplified adjustment factor for volume rooms_adjustment = (num_heated_rooms - 5) * 0.5 # Assuming base case of 5 rooms # Calculate the estimated boiler size estimated_size = base_size[property_type] + form_adjustment[built_form] + volume_adjustment + rooms_adjustment # Step 5: Align with available boiler sizes and ensure it does not exceed 35kW, as it's rare to need more available_sizes = [30, 35, 40, 45, 50] estimated_size = min(max(estimated_size, 30), 40) # Ensure within 30kW to 35kW range # Find the closest available size (in this case, either rounding up or down to align with 30 or 35) closest_size = min(available_sizes, key=lambda x: abs(x - estimated_size)) return closest_size @staticmethod def estimate_electric_boiler_size(num_heated_rooms): """ We use the approach similar to as defined in https://www.greenmatch.co.uk/boilers/combi-boilers/electric-combi-boilers Instead of radiators as a proxy, we do the number of heated rooms :param num_heated_rooms: The number of heated rooms in the property :return: """ return max(num_heated_rooms * 1.5, 6) def recommend_boiler_upgrades(self, phase, system_change, exising_room_heaters): """ This boiler recommendation will only recommend a like-for-like upgrade, since changing the system is generally more expensive :param phase: :param system_change: Indicates if the property would be undergoing a heating system change. This could be true if the home didn't have a heating system in place, or if the home had electric heating previously :param exising_room_heaters: Indicates if the property had room heaters previously - if so, a boiler recommendation will need to be accompanied by removal of the room heaters :return: """ recommendation_phase = phase # We now recommend boiler upgrades, if applicable simulation_config = {} boiler_costs = {} boiler_recommendation = {} description_simulation = {} has_inefficient_space_heating = self.property.data["mainheat-energy-eff"] in ["Very Poor", "Poor", "Average"] # We check if there's a mains connection and the hot water is inefficient, as this will improve with a boiler has_inefficient_water = ( self.property.data["mains-gas-flag"] and self.property.data["hot-water-energy-eff"] in ["Very Poor", "Poor", "Average"] ) if has_inefficient_space_heating or has_inefficient_water: boiler_size = self.estimate_boiler_size( property_type=self.property.data["property-type"], built_form=self.property.data["built-form"], floor_area=self.property.floor_area, floor_height=self.property.floor_height, num_heated_rooms=self.property.data["number-heated-rooms"], ) if self.dual_heating: description = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["boiler"]["recommendation_description"] else: description = "Upgrade to a new condensing boiler." new_heating_eff = ( "Good" if self.property.data["mainheat-energy-eff"] in ["Very Poor", "Poor", "Average"] else self.property.data["mainheat-energy-eff"] ) new_hotwater_eff = ( "Good" if self.property.data["hot-water-energy-eff"] in ["Very Poor", "Poor", "Average"] else self.property.data["hot-water-energy-eff"] ) simulation_config = { "mainheat_energy_eff_ending": new_heating_eff, "hot_water_energy_eff_ending": new_hotwater_eff } description_simulation = { "mainheat-energy-eff": simulation_config["mainheat_energy_eff_ending"], "hot-water-energy-eff": simulation_config["hot_water_energy_eff_ending"], } if system_change: # Installation of a boiler improves the hot water system so we need to reflect this in # the outcome of the recommendation if self.dual_heating: new_heating_description = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["boiler"]["mainheating_description"] else: new_heating_description = "Boiler and radiators, mains gas" new_hotwater_description = "From main system" new_fuel_description = "mains gas (not community)" heating_ending_config = MainHeatAttributes(new_heating_description).process() hotwater_ending_config = HotWaterAttributes(new_hotwater_description).process() fuel_ending_config = MainFuelAttributes(new_fuel_description).process() heating_simulation_config = check_simulation_difference( new_config=heating_ending_config, old_config=self.property.main_heating ) hotwater_simulation_config = check_simulation_difference( new_config=hotwater_ending_config, old_config=self.property.hotwater ) fuel_simulation_config = check_simulation_difference( new_config=fuel_ending_config, old_config=self.property.main_fuel ) simulation_config = { **simulation_config, **heating_simulation_config, **hotwater_simulation_config, **fuel_simulation_config, } description_simulation = { **description_simulation, "mainheat-description": new_heating_description, "hotwater-description": new_hotwater_description, "main-fuel": new_fuel_description } boiler_costs = self.costs.boiler( size=f"{boiler_size}kw", exising_room_heaters=exising_room_heaters, system_change=system_change, n_heated_rooms=self.property.data["number-heated-rooms"], n_rooms=self.property.number_of_rooms ) already_installed = "heating" in self.property.already_installed if already_installed: boiler_costs = override_costs(boiler_costs) description = "Heating system has already been upgraded, no further action needed." boiler_recommendation = { "phase": recommendation_phase, "parts": [], "type": "heating", "measure_type": "boiler_upgrade", "description": description, "starting_u_value": None, "new_u_value": None, "sap_points": None, "already_installed": already_installed, "simulation_config": simulation_config, "description_simulation": description_simulation, **boiler_costs, "system_type": "boiler_upgrade", } # We recommend the heating controls # If the property did not previously have a boiler, we combine controls_recommender = HeatingControlRecommender(self.property) if self.dual_heating: description_suffix = self.DUAL_HEATING_DESCRIPTIONS[ self.property.main_heating["clean_description"] ]["boiler"]["controls_suffix"] else: description_suffix = "" controls_recommender.recommend( heating_description="Boiler and radiators, mains gas", description_suffix=description_suffix ) # We may have 2 recommendations from the heating controls if not controls_recommender.recommendation and not boiler_recommendation: return if not system_change and len(boiler_recommendation): # If there is not a system change, we add the boiler recommendation at point. self.heating_recommendations.extend([boiler_recommendation]) if system_change: # We combine the heating and controls recommendations, in the case of a system change combined_recommendations = [] for controls_recommendation in controls_recommender.recommendation: combined_recommendation = self.combine_heating_and_controls( controls_recommendations=[controls_recommendation], heating_simulation_config=simulation_config, heating_description_simulation=description_simulation, costs=boiler_costs, description=boiler_recommendation["description"], phase=recommendation_phase, heating_controls_only=False, system_change=True, system_type="boiler_upgrade", measure_type="boiler_upgrade", ) combined_recommendations.extend(combined_recommendation) # Overwrite the existing boiler recommendation self.heating_recommendations.extend(combined_recommendations) else: # We consider a heating control upgrade as a measure which occures in the same phase as a boiler upgrade # Namely, we have the following options within this phase # 1) Boiler + heating controls # 2) Boiler only # 3) Heating controls only # But they are options that are not mutually exclusive # So, we actually set heating controls as a heating recommendation for recommendation in controls_recommender.recommendation: recommendation["phase"] = recommendation_phase # recommendation["type"] = "heating" self.heating_control_recommendations.extend(controls_recommender.recommendation) return