Purdue University researcher Eckhard Groll says manufacturers are close to developing carbon-dioxide (CO2) air-conditioning systems for vehicles. “The main concern is not so much the technology as the service that is associated with it,” he says. Groll, an associate professor of mechanical engineering at Purdue in Lafayette, IN, says a related technology, in which a new generation of heat pumps will provide instant heat instead of waiting for the engine to warm up, also is on auto ...

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