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).
Page discussing radiator core efficiency and the limiting efficient depth of the core, with a comparative chart.
| Identifier | ExFiles\Box 178\1\ img031 | |
| Date | 15th February 1926 guessed | |
| - 15 - [Chart Data] LEFT COLUMN (AIR VEL. THROUGH CORE 25 FT/SEC): B: 72% C: 53% A: 50% RIGHT COLUMN (AIR VEL. THROUGH CORE 50 FT/SEC): B: 100% * C: 91% A: 68% CHART TITLE: TYPES OF RADIATOR CORE COMPARED WITH COOLING OF MOST EFFICIENT CORE WITH AIR VELOCITY OF 50 FT/SEC. (CALLED 100% COOLING. MARKED *.) (c) Limiting efficient depth of core. Up to a point, the efficiency of any radiator can be increased by adding to its depth. It is clear, however, that the difference in temperature between each unit of air and unit of radiator will decrease at the back of a core because the temperature of the air will already have been raised by its contact with the front of the core. Therefore, as a core is increased in depth so does the efficiency of each portion added in this manner decrease. For car speeds, with normal ventilation, increase in depth above 5" is not economical in bulk or weight; the diameter of the tubes is also taken into account. In aeroplane radiators where much higher air velocities are encountered, deeper radiators can be used with advantage. contd. | ||