combines a direct-fired heater with a thermal storage unit for cooling and is claimed to have
sufficient heat to keep both the engine and the cab/sleeper warm (Webasto 1999).
Truck stop electrification is another option for reducing truck idling. The trucker would
simply "plug in" the truck to outlets at the truck stop to power heaters, air conditioners, marker
lights, and accessories like microwave ovens and refrigerators. Electrification involves
modifying the truck stop as well as the truck. Currently, there are no truck stops that provide
plug-in power for truck and other heavy-vehicle needs, but a pilot test is planned as part of the
Texas Clean Cities program (MSR 1999). Also, the South Coast Air Quality Management
District (SCAQMD) has a program for truck stop operators to generate mobile source emission
reduction credits by providing electrification for trucks (SCAQMD 1997).
Electrification involves the installation at truck stops of ground electric outlets (or plates in
case of induction) at each parking space. It also involves retrofitting trucks with an electric
engine block heater, an electric fuel heater, an electric heating/cooling device for cab and sleeper
conditioning, and electric automatic idle control. A relay to bypass the battery and activate the
cab's electric system is also included. Provisions for buses and electric vehicles are also possible.
Truckers will not install the necessary equipment when there is no place to plug it in, and truck
stop owners will not install infrastructure when nobody has the equipment to use it. Volvo is
reported to offer an electrification option on new trucks (employing AC power systems) (T-SEA
1998), and Freightliner will soon as well. In addition, Volvo has purchased an interest in a chain
of truck stops (Tempchin 1999), which they might electrify.
As part of engine manufacturers' efforts to reduce parasitic power in their products, they are
replacing shaft-driven pumps and accessories with electrically driven devices. Electrically driven
pumps and compressors, such as those marketed by Sandon International, can be operated only
on demand, thereby reducing the overall parasitic load on the engine (Brooks 1999). The industry
envisions that the "electrified" truck will be capable of being plugged into outlets at the truck
stop. Specific Climate Systems (SCS/Frigette) produces several types of 110-V, electrically
driven cooling and heating systems that can be either be plugged in or operated by the engine's
alternator. SCS/Frigette also produces deep-cycle battery packs that provide 864 Ah, which
would provide an estimated 8 h of air-conditioning or heating (Pannell 1999).