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).
Graph and analysis comparing the performance of three different 'hot spot' heating systems from a cold start.
| Identifier | ExFiles\Box 66a\1\ scan0092 | |
| Date | 2nd February 1926 guessed | |
| contd :- -7- COMPARATIVE CURVES FOR 3 SYSTEMS. Graph Y-Axis: AVERAGE TEMP RELATIVE TO STARTING TEMP Graph X-Axis: TIME FROM START (MINS). Graph Data Series: 1) STD HOT SPOT BUTTERFLY VALVE IN EXH. PIPE SHUT 2) SUPERHEAT HOT SPOT 3) SIMPLE WATER HEATED HOT SPOT i.e., exhaust gas for the standard system, steam for the super-heated and water for the simple water system - increase when starting from cold. By average temperature is meant the mean of the inlet and outlet temperatures of the hot spot. The exhaust temperatures [strikethrough]of the exhaust[/strikethrough] were taken with thermo couples. Although the rate of heat to the charge at any instant is approximate proportional to the temperature difference on each side of the hot spot, there will be a considerably greater temperature drop between the hot [strikethrough]exhaust[/strikethrough] exhaust gas and the walls of the hot spot than between the water and the hot spot. Examining these curves without remembering this fact would lead us to suppose that the standard system was considerably superior contd:- | ||