GB686063A - Improvements relating to the heating and ventilating of motor vehicles - Google Patents

Abstract

686,063. Ventilating and heating vehicles. DAIMLER-BENZ AKT.-GES. March 13, 1951 [March 13, 1950], No. 6071/51. Class 137 [Also in Group XIII] A heating and ventilating system for motor vehicles adapted for the delivery to the interior of the vehicle of cool or heated fresh air or of circulated air or a mixture thereof is so arranged that air of different temperatures or mixture compositions, i.e. proportions of fresh and circulated air, may be delivered simultaneously to different parts of the vehicle interior. The arrangement shown comprises two units A and B, the unit A supplying air mainly to the upper part 6 of the vehicle space and the unit B supplying air to the lower part 8. The unit A includes two ducts 10, 11 leading from a common intake 13, a heatexchanger 14 connected into the engine coolant system being provided in the duct 10. Heated air and cold air respectively passing through the ducts 10, 11 is directed to a mixing chamber 20 which contains a valve 24 whereby the temperature of the air is regulated before its passage through a duct 21 leading to the vicinity of the windscreen and to the upper part 6 of the vehicle space. The unit B comprises a blower 26 having a second heat-exchanger 30 located at the blower intake, the heatexchanger 30 also being supplied, through pipes 31, 32, with hot fluid from the enginecoolant system. Cold fresh air is directed through a duct 33 connected into the duct 11 and through the heat-exchanger 30 where it is heated before passing through the blower to outlet pipes 41 extending transversely of the vehicle space. Means (not shown) may be provided to cut off the supply of hot fluid to the heat-exchanger 30 when the unit B is not required to supply heated air. The duct 33 is provided with a port 35 incorporating a manually operated valve 40, which can be positioned (as shown) to close the duct 33, thus allowing air in the vehicle to recirculate through the blower. Alternatively, the valve 40 may be operated to allow a mixture of heated or unheated fresh air and recirculated air to be passed through the blower 26. The unit A may be provided with a valve-controlled outlet 44 so that hot air or cold air or a mixture thereof may be directed into the footspace 8 of the vehicle interior. The heat-exchanger 30 may be a cooler or it may be removed and replaced by a length of piping during the period when heating is not required.