Lexus RZ and Toyota bZ4X: Radiant Heating saves energy

The Lexus RZ and Toyota bZ4X are currently two of the Toyota Group’s most significant new models. Energy consumption has been a central consideration since the earliest stages of their development, as it is across the development of every car.

The less energy an electric system uses, the more efficient it becomes. Every kilowatt-hour saved translates into extra driving range. Different engineering approaches can provide those savings, and that is precisely what has happened here.

Among the many solutions patented for these models, one concerns cabin heating and delivers a worthwhile reduction in energy use.

However, adopting this solution means there is no longer room for the conventional glovebox.

Lexus calls the feature Radiant Heating, a system that warms the cabin using infrared panels.

Lexus RZ and Toyota bZ4X radiant-heated dashboard

These new panels are fitted in the lower sections of the dashboard: beneath the steering column on the driver’s side and in the position formerly occupied by the glovebox for the front passenger.

As they are infrared panels, they can quickly heat nearby solid objects - in this instance, the legs of those travelling in the front seats.

According to the engineers involved in creating the system, the feeling is very similar to placing a warm blanket over your legs. They also state that its rapid operation brings the cabin up to the desired temperature almost immediately.

For safety reasons and to prevent any unpleasant incidents, the system also incorporates a sensor that detects any contact from the user. If this happens, the panels’ temperature is automatically lowered to 43 degrees.

Already offered on the Lexus RZ and due shortly on the Toyota bZ4X, this system claims to use 8% less energy than conventional climate control. While conventional climate control is generally the most common solution, it is also the most energy-intensive.