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).
Report page summarising experiments and conclusions on a boiler's superheat and exhaust heating systems.
| Identifier | ExFiles\Box 66a\1\ scan0126 | |
| Date | 10th July 1926 guessed | |
| contd :- -5- With the small feed of .025 dia. we could detect no increase of temp. of the condensing water in the calorimiter which indicated that the carb. under these particular conditions, absorbed the same amount of heat as put in by the boiler; a very desirable feature. It has been questioned what would be the effect of a stopped feed pipe to the boiler. A test shewed that the action is the same as with a small feed hole up to the max. temp. after which the hot spot cools down due to all the boiler water evaporating and then condensing and cooling in the hot spot. We can here summarise the conclusions arrived at from the preceeding experiments:- The superheat system of throttle heating seems to present no difficulty except that it has the disadvantage of being slower in its initial warming up than the present standard system. There seems no reason why this should be an inherent difficulty of the system and we are seeking to reduce the thermal capacity of the system by decreasing the boiler size, but keeping the heating area the same. With a small water feed to the boiler there should be little or no heat added to the cooling system. Provision must be made to prevent stoppage in the feed pipe - fine gauze as suggested in RL/M5.7.26. We are at present preparing the alternative scheme suggested in RL/M5.7.26 in which the system is sealed to about 100 lbs/sq.in. With regard to the exhaust heated system it appears difficult to obtain sufficiently brisk circulation with the present pipes without employing a choke valve in the exhaust pipe when light running at low speeds and the exhaust volume is not very great. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey. | ||