| 摘要 |
A heating/air-conditioning device includes a high-performance heat exchanger for providing air-conditioning of the vehicle cab of passenger cars and is designed and optimized for the large-scale production of passenger cars concerning quantity and costs. The construction size of a heat exchanger, which is already designed as a high-performance heat exchanger and has a soldered matrix, is enlarged beyond the previously known size, so that the vehicle delivers the same heating power as the previous basic series including a much more expensive PTC auxiliary heater. In addition to cost savings, fuel is saved in an order of 0.5-1.01/100 km, compared to an operation with a PTC auxiliary heater and at the same heating power. The heat exchanger employed here, which includes coolant-side flat tubes and air-side fins having a plurality of turbulence-producing recesses (louvers) following each other in the air flow direction, preferably has a volume V_matrix of the heat exchanger matrix washed round from the heating air, and a center-to-center spacing of the air-side fins t_fin and a center-to-center spacing of the flat coolant tubes t_tube, such that the specific heat exchanger volume V_spec produced therefrom by using the equation V_spec=V_matrix/(t_tube+(4*t_fin)) exceeds a lower limit of 0.140 m2.
|
