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).
Technical explanation of the fundamental methods of heat dissipation in a cooling system, focusing on conduction and convection.
| Identifier | ExFiles\Box 178\1\ img018 | |
| Date | 15th February 1926 guessed | |
| - 2 - That is, in this case, almost one-third of the total heat contained in the petrol is rejected to the cooling system. (b) Heat dissipating capacity of the cooling system. There are three fundamental methods of getting rid of heat. They are - Conduction, Convection and Radiation. (Radiation may be neglected). Conduction plays a small part in known cooling systems in transmitting the heat units from the inside to the outside of the cylinder walls, also in the conventional system from the inside to the outside of the radiator matrix tube. Otherwise it may be neglected. Convection is the main factor used in the automobile. Convection currents are naturally set up by the passage of a vehicle through the atmosphere. These currents are used to dissipate the superfluous heat generated. They may be used directly in which case the engine is said to be air-cooled. Practically all motor-cycle engines, and one or two car engines are cooled in this manner. They may be used in conjunction with a liquid, in which case the fluid is first circulated round the cylinder from which it extracts heat, and then passed through a radiator or other device which exposes a large surface to these convectional currents. The extract heat from the liquid which is returned to the cylinder and the process is repeated. Finally, convectional air currents may be used in conjunction with a liquid and a vapour. Under these circumstances contd. | ||