def BTULBtoKJKG(hbtulb):
    """
    Convertie l'enthalpie en btu/lb vers kJ/kg
        Conversion: 1 kJ/kg = 0.429923 Btu/lb
    :param hbtulb: Enthalpie [btu/lb]
    :return hkjkg: Enthalpie [kJ/kg]
    """
    hkjkg = hbtulb / 0.429923
    return hkjkg