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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The placement of vehicle heating, ventilation, and defrosting system components.

Identifier  ExFiles\Box 137\3\  scan0024
Date  23th January 1939
  
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(2) Space - the only suitable place for the heater and fan unit (which would also include motor and air filter) is under the driver's seat, so that air can be delivered to both front and rear compartments. At present it has been decided to put the battery in this position, which makes the use of method (C) impracticable - however, this objection will disappear if ideas change as regards battery position.

(3) Location of inlet for fresh air - we have incorporated a duct in a bulge in the offside front wing on 28.G.Vl{V. Lewis / Mr Valentine}, which seems successful, but we have not yet had the opportunity of testing this for fumes etc. in London traffic. This is the only practicable point for the inlet which we have been able to find on a wraith car, to give us material assistance with air supply by virtue of the car's motion.

It should be pointed out that method (C), delivering air to front and rear compartments, is the only successful method of warming rear seat as well as front seat passengers with one heater - in particular this applies with a division car. With this scheme we have heard that it is necessary to mix and circulate some of the air in the car with the incoming fresh warmed air in order to prevent the air in the car interior becoming too dry and affecting the throats of occupants - we have not, however, personally come up against this necessity.

Demisting and Defrosting.

With methods (A) and (C) there is less need for a demister than with method (B), the need for a defroster, of course, is unaffected.

If a defroster is needed with methods (A) and (C) a separate blower must be used, drawing air from the main heater and delivering to the windscreen.

With method (B) a defroster blower can conveniently be built in to the heater design, and easily connected to the windscreen if the heater is located on the dash.

The requisite of an effective defroster or demister is that it should deliver a large quantity of hot air directed at high velocity on to the interior of the windshield and for this it is necessary to use a suitably designed blower, the ordinary heater 'propeller' type fan will not give sufficient delivery head
  
  


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