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).
Comparison of Harrison and Marston 4 plate Viscon coolers based on heat dissipation and oil pressure drop.
| Identifier | ExFiles\Box 137\1\ scan0303 | |
| Date | 16th November 1937 guessed | |
| COMPARISON OF HARRISON 4 PLATE VISCON AND MARSTON 4 PLATE VISCON. Oil flow - 7 G.P.M. = 59.5 lbs/min. Water flow - 15 G.P.M. Heat Dissipation - (1) Harrison - 174.8 BTh.Us/Min/40°F.I.T.D. (2) Marston - 139.0 BTh.Us/Min/40°F.I.T.D. i.e. under same conditions, Harrison Viscon dissipates 20% more heat than Marston Viscon. (Note. Harrison Viscon dissipates 11% more heat than std. honeycomb type of cooler.) Oil Pressure drop. (1) Harrison - 15 lbs/sq.in. (Inlet oil 210°F.{Mr Friese}) (2) Marston - 46.8 " Hg. = 22.9 lbs/sq.in. (mean oil 235°F) .. Press. drop with Marston cooler is 53% greater. | ||