Source code for RCAIDE.Library.Methods.Powertrain.Systems.compute_cabin_loads_power_draw

# RCAIDE/Library/Methods/Powertrain/Systems/compute_cabin_loads_power_draw.py
# 
# Created:  May 2026, M. Clarke, S. Sharma 

# ----------------------------------------------------------------------------------------------------------------------
#  IMPORT
# ----------------------------------------------------------------------------------------------------------------------    
# package imports


def compute_cabin_loads_power_draw(cabin_loads,vehicle,state,bus):
    """
    Computes the power draw of a cabin loads system.
    
    Parameters
    ----------
    cabin_loads : Cabin_Loads
        The cabin loads component object
            - power_draw : float
                Power consumption of the hydraulic systems component [W]
    vehicle : Vehicle()
        The vehicle object
    bus : Electrical_Bus
        The electrical bus that powers the cabin system
    state : State
        Object containing the current state of the aircraft
    
    Returns
    -------
    None
        This function modifies the cabin_loads_conditions.power array in-place.
    
    Notes
    -----
    This function calculates the continuous steady-state electrical load of the 
    cabin by scaling In-Flight Entertainment (IFE), commercial galley usage, and 
    lighting linearly with the aircraft's passenger capacity.
    
    For more complex cabin loads models, this function could be extended to calculate
    power draw based on operating mode, altitude, or other mission parameters.
    
    See Also
    --------
    RCAIDE.Library.Methods.Powertrain.Systems.append_cabin_loads_conditions
    """
    N_pax              = vehicle.number_of_passengers
    
    # In-flight entertainment (IFE) power per passenger, galley power per passenger, and lighting power per passenger
    P_ife_per_pax      = 41                             # Watts
    P_galley_per_pax   = 320 * 0.5                      # Watts (For cruise segment, we can assume 50% usage factor for galley power)
    P_lighting_per_pax = 3.2 + 1.4 + 10                 # Watts (Reading Lights + Ambient Lighting + General Cabin Lighting, scales with pax)
    
    P_cabin            = (N_pax * (P_ife_per_pax + P_galley_per_pax + P_lighting_per_pax))
            
    bus_conditions                    = state.conditions.energy.busses[bus.tag]
    cabin_loads_conditions            = bus_conditions[cabin_loads.tag]    
    cabin_loads_conditions.power[:,0] = P_cabin
    bus_conditions.power_draw        += cabin_loads_conditions.power*bus.power_split_ratio /bus.efficiency    
    
    return