calculate_worksheet function
- sap2012.SAP_worksheet.calculate_worksheet.calculate_worksheet(inputs)[source]
This function runs the complete set of calculations for the SAP2012 worksheet.
- Parameters:
inputs (dict) – A dictionary of the SAP model inputs.
- Returns:
A dictionary with the results of all the calculation sections.
- Return type:
SAP Calculation Sections
The SAP calculation sections are run as given in the order below:
overall_dwelling_dimensions(Section 1)ventilation_rates(Section 2)heat_losses_and_heat_loss_parameter(Section 3)water_heating_requirement(Section 4)internal_gains(Section 5)solar_gains(Section 6)mean_internal_temperature(Section 7)space_heating_requirement(Section 8)energy_requirements(Section 9)fuel_costs(Section 10)SAP_rating(Section 11)CO2_emissions(Section 12)
Inputs
The ‘inputs’ dictionary holds all the inputs to run a complete SAP calculation. The dictionary is a collection of 18 individual dictionaries which contain the model inputs to individual calculation sections as listed above.
To see definitions of the model inputs, please see the documentation for the individual calculation sections.
For the
calculate_worksheetfunction, not all inputs need to be provided for all calculation sections. This is because some inputs for later sections are calculated as outputs by earlier sections.An example of a valid ‘inputs’ dictionary is:
{'overall_dwelling_dimensions': {'area':[0,63,63], 'average_storey_height': [0,2.5,2.75] } 'ventilation_rates': {'number_of_chimneys_main_heating': 0, 'number_of_chimneys_secondary_heating': 0, 'number_of_chimneys_other': 0, 'number_of_open_flues_main_heating': 0, 'number_of_open_flues_secondary_heating': 0, 'number_of_open_flues_other': 0, 'number_of_intermittant_fans_total': 0, 'number_of_passive_vents_total': 0, 'number_of_flueless_gas_fires_total': 0, 'air_permeability_value_q50': 11.78, 'number_of_storeys_in_the_dwelling': 2, 'structural_infiltration': 0, 'suspended_wooden_ground_floor_infiltration': 0, 'no_draft_lobby_infiltration': 0, 'percentage_of_windows_and_doors_draught_proofed': 0, 'number_of_sides_on_which_dwelling_is_sheltered': 2, 'monthly_average_wind_speed': [4.5, 4.5, 4.4, 3.9, 3.8, 3.4, 3.3, 3.3, 3.5, 3.8, 3.9, 4.1], 'applicable_case': 'natural ventilation or whole house positive input ventilation from loft', 'mechanical_ventilation_air_change_rate_through_system': 0.5, 'exhaust_air_heat_pump_using_Appendix_N': False, 'mechanical_ventilation_throughput_factor': None, 'efficiency_allowing_for_in_use_factor': None } 'heat_losses_and_heat_loss_parameter': {'solid_door_net_area': 1.5, 'solid_door_u_value': 3, 'semi_glazed_door_net_area': 10.6, 'semi_glazed_door_u_value': 1.4, 'window_net_area': 23, 'window_u_value': 2, 'roof_window_net_area': 0, 'roof_window_u_value': None, 'basement_floor_net_area': 0, 'basement_floor_u_value': None, 'basement_floor_heat_capacity': None, 'ground_floor_net_area': 63, 'ground_floor_u_value': 0.63, 'ground_floor_heat_capacity': 20, 'exposed_floor_net_area': 0, 'exposed_floor_u_value': None, 'exposed_floor_heat_capacity': None, 'basement_wall_gross_area': 0, 'basement_wall_opening': 0, 'basement_wall_u_value': None, 'basement_wall_heat_capacity': None, 'external_wall_gross_area': 120, 'external_wall_opening': 35.1, 'external_wall_u_value': 1.5, 'external_wall_heat_capacity': 190, 'roof_gross_area': 63, 'roof_opening': 0, 'roof_u_value': 0.14, 'roof_heat_capacity': 9, 'party_wall_net_area': 47, 'party_wall_u_value': 0.5, 'party_wall_heat_capacity': 180, 'party_floor_net_area': 0, 'party_floor_heat_capacity': None, 'party_ceiling_net_area': 39, 'party_ceiling_heat_capacity': 100, 'internal_wall_net_area': 131, 'internal_wall_heat_capacity': 9, 'internal_floor_net_area': 63, 'internal_floor_heat_capacity': 18, 'internal_ceiling_net_area': 63, 'internal_ceiling_heat_capacity': 9, 'thermal_bridges_appendix_k': 36.9 }, 'water_heating_requirement': {'assumed_occupancy': 2.88, 'V_dm_table_1c': [1.1, 1.06, 1.02, 0.98, 0.94, 0.9, 0.9, 0.94, 0.98, 1.02, 1.06, 1.1], 'days_in_month': [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], 'T_table_1d': [41.2, 41.4, 40.1, 37.6, 36.4, 33.9, 30.4, 33.4, 33.5, 36.3, 39.4, 39.9], 'water_storage_loss_manufacturer': 0, 'temperature_factor_table_2b': 0, 'storage_volume_litres': 0, 'hot_water_storage_loss_table_2': 0, 'volume_factor_table_2a': 0, 'Vs_appendix_G3': 0, 'solar_storage_WWHRS_factor': 0, 'primary_circuit_loss_table_3': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'combi_loss_table_3': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'solar_DHW_input_appendix_G': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] }, 'internal_gains_appendix_L': {'number_of_low_energy_light_bulbs': 0, 'total_number_of_light_bulbs': 10, 'frame_factor': 0.7, 'window_area': 23, 'light_access_factor_table_6d': 0, 'light_transmittance_factor_table_6d': 0, 'month_number': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12] }, 'internal_gains': {'pumps_and_fans_gains':[3,3,3,3,3,3,3,3,3,3,3,3] } 'solar_gains_appendix_U3': {'solar_radiation_horizontal_plane_monthly_table_U3': [28, 55, 97, 153, 191, 208, 194, 208, 163, 69, 35, 23], 'solar_declination_monthly_table_U3': [-20.7, -12.8, -1.8, 9.8, 18.8, 23.1, 21.2, 13.7, 2.9, -8.7, -18.4, -23], 'location_latitude_table_U4': 53.4, 'p_tilt': 90 }, 'solar_gains': {'access_factor_table_6d_north': 0.77, 'access_factor_table_6d_north_east': 0, 'access_factor_table_6d_east': 0.77, 'access_factor_table_6d_south_east': 0, 'access_factor_table_6d_south': 0.77, 'access_factor_table_6d_south_west': 0, 'access_factor_table_6d_west': 0, 'access_factor_table_6d_north_west': 0, 'access_factor_table_6d_roof_windows': 0, 'area_north': 10, 'area_north_east': 0, 'area_east': 4.9, 'area_south_east': 0, 'area_south': 11.9, 'area_south_west': 0, 'area_west': 0, 'area_north_west': 0, 'area_roof_windows': 0, 'solar_flux_roof_windows': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'g_table_6b_north': 0.72, 'g_table_6b_north_east': 0, 'g_table_6b_east': 0.72, 'g_table_6b_south_east': 0, 'g_table_6b_south': 0.72, 'g_table_6b_south_west': 0, 'g_table_6b_west': 0, 'g_table_6b_north_west': 0, 'g_table_6b_roof_windows': 0, 'FF_table_6b_north': 0.72, 'FF_table_6b_north_east': 0, 'FF_table_6b_east': 0.72, 'FF_table_6b_south_east': 0, 'FF_table_6b_south': 0.72, 'FF_table_6b_south_west': 0, 'FF_table_6b_west': 0, 'FF_table_6b_north_west': 0, 'FF_table_6b_roof_windows': 0 }, 'utilisation_factor_for_heating_table_9a': {'temperature_during_heating_living_room': 20, 'heating_controls': 2, 'monthly_external_temperature_table_U1': [4.3, 4.8, 6.6, 9, 11.8, 14.8, 16.6, 16.5, 14, 10.5, 7.1, 4.2] }, 'temperature_reduction_when_heating_is_off_table_9b': {'hours_heating_is_off_1_weekday_living_room': 8, 'hours_heating_is_off_2_weekday_living_room': 8, 'hours_heating_is_off_1_weekend_living_room': 8, 'hours_heating_is_off_2_weekend_living_room': 8, 'hours_heating_is_off_1_weekday_rest_of_dwelling': 8, 'hours_heating_is_off_2_weekday_rest_of_dwelling': 8, 'hours_heating_is_off_1_weekend_rest_of_dwelling': 8, 'hours_heating_is_off_2_weekend_rest_of_dwelling': 8, 'responsiveness_of_heating_system': 1 }, 'heating_requirement_table_9c': {'temperature_adjustment_table_4e': 0 }, 'mean_internal_temperature': {'living_room_area': 16 }, 'energy_requirements': {'fraction_of_space_heat_secondary_system': 0, 'fraction_of_space_heat_from_main_system_2': 0, 'efficiency_of_main_space_heating_system_1': 88.8, 'efficiency_of_main_space_heating_system_2': 0, 'efficiency_of_secondary_space_heating_system': 0, 'cooling_system_energy_efficiency_ratio_table_10c': 0, 'water_heater_type': 'gas/oil boiler main system', 'efficiency_of_water_heater': 80, 'efficiency_of_water_heater_adjustment_table_4c': 0, 'space_cooling_requirement_monthly': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], 'electricity_demand_mechanical_ventilation_fans_table_4f': 0, 'electricity_demand_warm_air_heating_systems_fans_table_4f': 0, 'electricity_demand_central_heating_pump_or_water_pump_table_4f': 0, 'electricity_demand_oil_boiler_pump_table_4f': 0, 'electricity_demand_boiler_flue_fan_table_4f': 0, 'electricity_demand_keep_hot_facility_gas_combi_boiler_table_4f': 0, 'electricity_demand_pump_for_solar_water_heating_table_4f': 0, 'electricity_demand_pump_for_storage_WWHRS_Table_G3': 0, 'electricity_generated_by_PV_appendix_M': [0], 'electricity_generated_by_wind_turbine_appendix_M': [0], 'electricity_used_or_generated_by_micro_CHP_appendix_N': [0], 'electricity_generated_by_hydro_electric_generator_appendix_M': [0], 'appendix_Q_energy_saved': [0], 'appendix_Q_energy_used': [0] }, 'fuel_costs': {'space_heating_fuel_price_main_system_1': 3.48, 'space_heating_fuel_price_main_system_2': 0, 'space_heating_fuel_price_secondary': 0, 'water_heating_high_rate_fraction_table_13': 0, 'water_heating_low_rate_fraction_table_13': 1, 'high_rate_fuel_price': 0, 'low_rate_fuel_price': 3.48, 'water_heating_fuel_price_other': 0, 'space_cooling_fuel_used': 0, 'space_cooling_fuel_price': 0, 'electricity_for_pumps_fans_electric_keep_hot': 0, 'fuel_price_for_pumps_fans_electric_keep_hot': 0, 'fuel_price_for_lighting': 13.19, 'additional_standing_charges_table_12': 0, 'energy_saving_generation_technologies': [0], 'energy_saving_generation_technologies_fuel_price': [0], 'appendix_Q_energy_used_fuel_price': [0], 'appendix_Q_energy_saved_fuel_price': [0] }, 'SAP_rating': {'energy_cost_deflator': 0.42 }, 'CO2_emissions': {'space_heating_fuel_emission_factor_main_system_1': 0.216, 'space_heating_fuel_emission_factor_main_system_2': 0, 'space_heating_fuel_emission_factor_secondary': 0, 'water_heating_fuel_emission_factor': 0.216, 'space_cooling_fuel_emission_factor': 0, 'fuel_emission_factor_for_pumps_fans_electric_keep_hot': 0, 'fuel_emission_factor_for_lighting': 0.519, 'energy_saving_generation_technologies_fuel_emission_factor': [0], 'appendix_Q_energy_used_fuel_emission_factor': [0], 'appendix_Q_energy_saved_fuel_emission_factor': [0] } }
Outputs
The
calculate_worksheetfunction returns a dictionary containing the outputs of all SAP calculation sections.The output dictionary is a collection of dictionaries, where each dictionary holds the outputs of an individual calculation section.
An example of an output dictionary as returned by the
calculate_worksheetfunction is:{ "overall_dwelling_dimensions": { "volume": [ 0, 157.5, 173.25 ], "total_floor_area": 126, "dwelling_volume": 330.75 }, "ventilation_rates": { "number_of_chimneys_total": 0, "number_of_chimneys_m3_per_hour": 0.0, "number_of_open_flues_total": 0, "number_of_open_flues_m3_per_hour": 0.0, "number_of_intermittant_fans_m3_per_hour": 0.0, "number_of_passive_vents_m3_per_hour": 0.0, "number_of_flueless_gas_fires_m3_per_hour": 0.0, "infiltration_due_to_chimneys_flues_fans_PSVs": 0.0, "additional_infiltration": null, "window_infiltration": null, "infiltration_rate": null, "infiltration_rate2": 0.589, "shelter_factor": 0.85, "infiltration_rate_incorporating_shelter_factor": 0.5006499999999999, "wind_factor": [ 1.125, 1.125, 1.1, 0.975, 0.95, 0.85, 0.825, 0.825, 0.875, 0.95, 0.975, 1.025 ], "adjusted_infiltration_rate_allowing_for_shelter_and_wind_speed": [ 0.56323125, 0.56323125, 0.550715, 0.4881337499999999, 0.4756174999999999, 0.42555249999999994, 0.41303624999999994, 0.41303624999999994, 0.43806874999999995, 0.4756174999999999, 0.4881337499999999, 0.5131662499999999 ], "exhaust_air_heat_pump_air_change_rate_through_system": null, "effective_air_change_rate": [ 0.6586147204882813, 0.6586147204882813, 0.6516435056125, 0.6191372789445312, 0.6131060031531249, 0.590547465128125, 0.5852994719070312, 0.5852994719070312, 0.5959521148632813, 0.6131060031531249, 0.6191372789445312, 0.6316698000695312 ] }, "heat_losses_and_heat_loss_parameter": { "solid_floor_UA": 4.5, "semi_glazed_door_UA": 14.839999999999998, "window_UA": 46, "roof_window_UA": 0, "basement_floor_UA": 0, "basement_floor_Ak": 0, "ground_floor_UA": 39.69, "ground_floor_Ak": 1260, "exposed_floor_UA": 0, "exposed_floor_Ak": 0, "basement_wall_net_area": 0, "basement_wall_UA": 0, "basement_wall_Ak": 0, "external_wall_net_area": 84.9, "external_wall_UA": 127.35000000000001, "external_wall_Ak": 16131.000000000002, "roof_net_area": 63, "roof_UA": 8.82, "roof_Ak": 567, "total_area_of_external_elements": 246.0, "party_wall_UA": 23.5, "party_wall_Ak": 8460, "party_floor_Ak": 0, "party_ceiling_Ak": 3900, "internal_wall_Ak": 1179, "internal_floor_Ak": 1134, "internal_ceiling_Ak": 567, "fabric_heat_loss": 264.7, "heat_capacity": 33198.0, "thermal_mass_parameter": 263.4761904761905, "thermal_bridges": 36.9, "total_fabric_heat_loss": 301.59999999999997, "ventilation_heat_loss_calculated_monthly": [ 71.88615020449468, 71.88615020449468, 71.12525952884035, 67.57728615359822, 66.9189874791557, 64.45677945007202, 63.8839741099727, 63.8839741099727, 65.04668345703999, 66.9189874791557, 67.57728615359822, 68.94517950308916 ], "heat_transfer_coefficient": [ 373.48615020449466, 373.48615020449466, 372.7252595288403, 369.1772861535982, 368.51898747915567, 366.056779450072, 365.4839741099727, 365.4839741099727, 366.64668345703996, 368.51898747915567, 369.1772861535982, 370.5451795030891 ], "average_heat_transfer_coefficient": 369.1088914861237, "heat_loss_parameter": [ 2.9641757952737673, 2.9641757952737673, 2.9581369803876214, 2.9299784615364937, 2.924753868882188, 2.905212535318032, 2.9006664611902595, 2.9006664611902595, 2.909894313151111, 2.924753868882188, 2.9299784615364937, 2.940834757961025 ], "average_heat_loss_parameter": 0.27899387111573976 }, "water_heating_requirement": { "annual_hot_water_usage_litres_per_day": 108.0, "hot_water_usage_in_litres_per_day_monthly": [ 118.80000000000001, 114.48, 110.16, 105.84, 101.52, 97.2, 97.2, 101.52, 105.84, 110.16, 114.48, 118.80000000000001 ], "energy_content_of_water_used": [ 176.17696800000002, 154.0855008, 159.00243479999997, 138.622176, 133.01127839999998, 114.77861999999999, 106.35926399999998, 122.04881039999998, 123.50646, 143.93487239999996, 157.116168, 170.617986 ], "distribution_loss": [ 26.426545200000003, 23.11282512, 23.850365219999997, 20.793326399999998, 19.951691759999996, 17.216793, 15.953889599999997, 18.307321559999995, 18.525969, 21.590230859999995, 23.5674252, 25.5926979 ], "energy_lost_from_water_storage": 0, "water_storage_loss_monthly": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ], "total_heat_required_for_water_heating": [ 176.17696800000002, 154.0855008, 159.00243479999997, 138.622176, 133.01127839999998, 114.77861999999999, 106.35926399999998, 122.04881039999997, 123.50646, 143.93487239999996, 157.116168, 170.617986 ], "output_from_water_heater_monthly": [ 176.17696800000002, 154.0855008, 159.00243479999997, 138.622176, 133.01127839999998, 114.77861999999999, 106.35926399999998, 122.04881039999997, 123.50646, 143.93487239999996, 157.116168, 170.617986 ], "heat_gains_from_water_heating_monthly": [ 58.57884186000001, 51.233429016, 52.868309571, 46.09187352, 44.22625006799999, 38.16389115, 35.364455279999994, 40.58122945799999, 41.06589795, 47.85834507299999, 52.24112586, 56.730480345000004 ] }, "internal_gains_appendix_L": { "G_L": 0.0, "C_1": 1.0, "C_2": 1.433, "E_B": 961.3129846269878, "initial_annual_lighting_demand": 1377.5615069704736, "monthly_lighting_demand": [ 170.44004138215163, 136.73333404409811, 123.11320471364185, 90.19801113556179, 69.67153789610578, 56.92224382365604, 63.55670774707949, 82.61341500897964, 107.30665588605414, 140.792137622484, 159.02439796754066, 175.17709717811994 ], "annual_lighting_demand": 1375.548784405473, "lighting_gains": [ 194.72316555756572, 172.9513897879217, 140.65352689058545, 106.48376314614931, 79.59785915549719, 67.19987118070505, 72.61183008738921, 94.38360585703319, 126.68146875436948, 160.85123249880564, 187.7371364894577, 200.1351244642499 ], "initial_annual_electrical_appliance_demand": 3344.397090331292, "monthly_electrical_appliance_demand": [ 324.97196609445984, 296.56891709489645, 319.84634209264283, 292.02145229267745, 278.91906038248453, 249.1509937495433, 243.11740267414316, 239.74521055639624, 240.2351871057679, 266.3338680661697, 279.8422339220502, 310.63334189407493 ], "annual_electrical_appliance_demand": 3341.3859759253064, "appliances_gains": [ 436.7902770086826, 441.32279329597685, 429.9009974363479, 405.5853504064965, 374.89121019151145, 346.0430468743657, 326.77070251900966, 322.2381862317154, 333.6599820913443, 357.9756291211959, 388.66976933618076, 417.5179326533265 ], "cooking_gains": [ 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16, 55.16 ], "losses": [ -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999, -115.19999999999999 ], "water_heating_gains": [ 78.73500250000002, 76.24022175, 71.059555875, 64.016491, 59.44388449999999, 53.005404375, 47.532869999999996, 54.544663249999985, 57.035969375, 64.32573262499999, 72.55711925, 76.250645625 ], "metabolic_gains": [ 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998, 172.79999999999998 ] }, "internal_gains": { "total_internal_gains": [ 826.0084450662484, 806.2744048338986, 757.3740802019332, 691.8456045526458, 629.6929538470085, 582.0083224300707, 562.6754026063988, 586.9264553387486, 633.1374202207138, 698.9125942450014, 764.7240250756385, 809.6637027425766 ] }, "solar_gains_appendix_U3": { "solar_flux_north": [ 11.436412538787879, 20.68106276617149, 34.88819996564874, 56.60050580088716, 74.37336606102218, 83.23769024974976, 76.70104638812194, 78.53644960579577, 58.8572132744309, 25.27636829258531, 13.896518711289401, 9.694808146066876 ], "solar_flux_north_east": [ 12.145680410782088, 23.390120502005598, 41.822541929590635, 69.35106310279406, 90.92010849368495, 101.33317075341961, 93.56166394939247, 96.27172344125725, 71.49571781748358, 29.345278592731244, 15.052394030804441, 10.086433192648474 ], "solar_flux_east": [ 21.134620057486963, 39.10325251255132, 63.89067906174743, 94.07548963233845, 112.45528635480359, 120.35576029517244, 113.08865238428933, 125.3690022999708, 104.24164026519922, 47.62774419378216, 25.95337911472664, 17.67550544600751 ], "solar_flux_south_east": [ 39.52445140930432, 63.67584001530772, 86.45248517226558, 108.19002478773515, 118.24508642072698, 122.75319126127208, 116.79405702599594, 138.09149868418606, 131.337465411037, 72.24114109708997, 46.62387627277164, 34.40022790846911 ], "solar_flux_south": [ 50.19978039205471, 77.74870204827221, 98.25759733263759, 112.15296767461275, 114.04561780476595, 114.77624296019953, 110.66770715027762, 138.64572001814557, 144.00160165626096, 86.0766956546692, 58.60023126922464, 44.116758929075765 ], "solar_flux_south_west": [ 39.52445140930432, 63.67584001530772, 86.45248517226558, 108.19002478773515, 118.24508642072698, 122.75319126127208, 116.79405702599594, 138.09149868418606, 131.337465411037, 72.24114109708997, 46.62387627277164, 34.40022790846911 ], "solar_flux_west": [ 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"SAP_rating": { "energy_cost_factor": 1.7754795340546146, "SAP_rating_value": 75.23206049993813 }, "CO2_emissions": { "space_heating_main_system_1_emissions": 2935.972510785698, "space_heating_main_system_2_emissions": 0.0, "space_heating_secondary_emissions": 0.0, "water_used_emissions": 424.68288967998717, "space_cooling_used_emissions": 0, "pumps_fans_electric_keep_hot_emissions": 0, "lighting_emissions": 713.9098191064405, "appendix_Q_used_emissions": [ 0 ], "appendix_Q_saved_emissions": [ 0 ], "energy_saving_generation_technologies_emissions": [ 0 ], "space_and_water_heating_emissions": 3360.655400465685, "appendix_Q_total_used_emissions": 0, "appendix_Q_total_saved_emissions": 0, "energy_saving_generation_technologies_total_emissions": 0, "total_CO2_emissions_yearly": 4074.5652195721254, "dwelling_CO2_emission_rate": 32.337819202953376, "CF": 23.82786678112354, "EI_rating": 68.07065851329446 } }