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).
Methods for accelerating engine warm-up using thermostatic water control and radiator shutters.
| Identifier | ExFiles\Box 13\3\ 03-page074 | |
| Date | 21th January 1929 guessed | |
| -7- Contd. provides good distribution, it would appear to be our immediate problem to find the best means of quickly reaching the normal water temperature. It has been suggested that this could be best accomplished by thermostatic control of the jacket water so arranged that the water after passing through the cylinder block returned to the pump by passing through the jacketed bend when the thermostat was closed. This should considerably accelerate the warming up due to - firstly, the reduced volume of water in circulation, secondly, elimination of the cooling effect due to the thermal capacity of the metal of the radiator even with the shutters closed and thirdly, the high water velocity through the induction jacket would considerably increase the heat transfer coefficient and therefore have the effect of getting heat to the interior of the induction bend quicker. The latter we have proved by experiment on the test bed. The radiator shutters would of course be retained but it would be advisable to transfer the thermometer to the header tank of the radiator. The radiator shutters should greatly assist in maintaining an even air temp. under the bonnet. With such a system the cyll jacket and hot spot would possess the maximum rate of warming up, would automatically remain constant and the hand control of the shutters would tend to give the minimum variation of air temperature. Contd. | ||