A coolpower setup in a truck

Truck

A truck or lorry is a motor vehicle designed to transport cargo. Trucks vary greatly in size, power, and configuration, with the smallest being mechanically similar to an automobile...

 engine

Engine

An engine or motor is a machine designed to convert energy into useful mechanical motion. Heat engines, including internal combustion engines and external combustion engines burn a fuel to create heat which is then used to create motion...

 uses an aftercooler on the cylinder head and a tip turbine fan to draw heat away from the cylinder head and ram air over the aftercooler. Large Mack

Mack Trucks

Mack Trucks is an American truck-manufacturing company and a former manufacturer of buses and trolley buses. A wholly owned subsidiary of Renault Véhicules Industriels since 1990, Mack Trucks is currently a subsidiary of AB Volvo. The company's headquarters are located in Greensboro, North Carolina...

 trucks from the 1970s such as the Mack R-600

Mack R series

The Mack R Model was a Class 8 heavy-duty truck first introduced in 1966, by Mack Trucks, to replace the very successful Mack B Model. Its production ran for 40 years until the RD model was discontinued in 2002 and the RB and DM models were discontinued in 2005. The first R models introduced were...

 used coolpower systems. Some coolpower systems used vertical bar shutters that could be opened and shut in front of the radiator to maintain proper operating temperature

Operating temperature

An operating temperature is the temperature at which an electrical or mechanical device operates. The device will operate effectively within a specified temperature range which varies based on the device function and application context, and ranges from the minimum operating temperature to the...

.

The Mack Cruise Liner model built in 1984, a 6X4 Primemover, used a
320 hp coolpower engine.

Air intakes on turbochargers

The term is also used to refer to “Cool Power” air intake systems for turbocharged engines. These systems provide cooler air to the turbocharger and engine, instead of the potentially too-warm air from the engine compartment. Cooler intake air is denser, which means that the engine can produce the same power with less fuel. Cooler air also gives the engine more power for applications such as towing heavy loads up driving up steep grades during the summer. Cooler air drawn into the engine compartment lowers the temperature under the hood, which allows plastic, rubber and electronic parts to last longer. Lastly, cool power systems will supports larger turbochargers by creating additional air flow to the engine.

Hydraulic drive system

The US military uses the expression "cool power" to describe its "regenerative drive unit", a "light-weight hybrid hydraulic drive system" that weighs 330 pounds. The "system can generate nearly 1000 ft.lbf of torque and power equivalent to a 340 hp engine." It operates by storing "energy normally lost as heat during the braking process in a high-pressure oil tank called an accumulator." The system use two hydraulic-fluid storage devices controlled by a central processor. One of the reasons the US military is interested in the system is that its "cool" power allows vehicles to move "... without generating a "thermal footprint" that can be identified by enemy tracking systems."