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Hourly Simulation
HourSimulation.py
An hourly simulation is the simplest utilisation of this code. We assume that we know:
- T_air: The outside air temperature
- T_m_prev: The starting building temperature
- internal_gains: Internal heat gains, in Watts
- solar_gains: Solar heat gains after transmitting through the winow [Watts]
- ill: Illuminance after transmitting through the window [Lumens]
- occupancy: Occupancy for the timestep [probabilty of full occupancy]
If the solar gains are not known, then they can be calculated using the radiation.py script
The building to be studied is then created using the Zone() class
my_building = Zone(args*)
The arguments here are
- window_area: Area of the Glazed Surface in contact with the outside [m2]
- walls_area: Area of non glazed surfaces to the outside [m2]
- floor_area: floor area of zone [m2]
- room_vol: volume of interior zone [m3]
- total_internal_area: area of all surfaces facing the room. A_t [m2]
- lighting_load: Lighting Load [W/m2]
- lighting_control: Lux threshold at which the lights turn on [Lx]
- u_walls: U value of opaque surfaces [W/m2K]
- u_windows: U value of glazed surfaces [W/m2K]
- ach_vent: Air changes per hour through ventilation [Air Changes Per Hour]
- ach_infl: Air changes per hour through infiltration [Air Changes Per Hour]
- ventilation_efficiency: The efficiency of the heat recovery system for ventilation. Set to 0 if there is no heat recovery []
- thermal_capacitance_per_floor_area: Thermal capacitance of the room per floor area [J/m2K]
- **t_set_heating **: Thermal heating set point [C]
- t_set_cooling: Thermal cooling set point [C]
- max_cooling_energy_per_floor_area: Maximum cooling load. Set to -np.inf for unresctricted cooling [C]
- max_heating_energy_per_floor_area: Maximum heating load per floor area. Set to no.inf for unrestricted heating [C]
- heating_supply_system: The type of heating system. Choices are DirectHeater, ResistiveHeater, HeatPumpHeater. Direct heater has no changes to the heating demand load, a resistive heater takes an efficiency into account, and a HeatPumpHeater calculates a COP based on the outdoor and indoor temperature
- cooling_supply_system: The type of cooling system. Choices are DirectCooler HeatPumpCooler. DirectCooler has no changes to the cooling demand load, a HeatPumpCooler calculates a COP based on the outdoor and indoor temperature
- heating_emission_system: How the heat is distrubuted to the building
- cooling_emission_system: How the cooling energy is distributed to the building
The default settings are
window_area=4.0,
external_envelope_area=15.0,
floor_area=35.0,
room_vol=105,
total_internal_area=142.0,
lighting_load=11.7,
lighting_control=300.0,
lighting_utilisation_factor=0.45,
lighting_maintenance_factor=0.9,
u_walls=0.2,
u_windows=1.1,
ach_vent=1.5,
ach_infl=0.5,
ventilation_efficiency=0.6,
thermal_capacitance_per_floor_area=165000,
t_set_heating=20.0,
t_set_cooling=26.0,
max_cooling_energy_per_floor_area=-float("inf"),
max_heating_energy_per_floor_area=float("inf"),
heating_supply_system=supply_system.OilBoilerMed,
cooling_supply_system=supply_system.HeatPumpAir,
heating_emission_system=emission_system.NewRadiators,
cooling_emission_system=emission_system.AirConditioning,Once initialised, you may solve the building for thermal energy demand and lighting demand
#Solve for building energy
my_building.solve_energy(internal_gains, solar_gains, t_air, t_m_prev)
#Solve for building lighting
my_building.solve_lighting(ill, occupancy)The results are bound to the Building Object, in this example my_building
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my_building.heating_demand: space heating demand of the building
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my_building.heating_sys_electricity: heating electricity consumption
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my_building.heating_sys_fossils: heating fossil fuel consumption
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my_building.cooling_demand: space cooling demand of the building
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my_building.cooling_sys_electricity: electricity consumption from cooling
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my_building.cooling_sys_fossils: fossil fuel consumption from cooling
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my_building.electricity_out: electricty produced from combined heat pump systems
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my_building.sys_total_energy: total exergy consumed (electricity + fossils) for heating and cooling
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my_building.heating_energy: total exergy consumed (electricity + fossils) for heating
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my_building.cooling_energy: total exergy consumed (electricity + fossils) for cooling
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my_building.cop: COP of the heating or cooling system
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my_building.has_heating_demand: Boolean
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my_building.has_cooling_demand: Boolean
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my_building.lighting_demand: lighting demand of the office space in Watts