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).
Analysis of the effect of altitude on the 'air temperature to boil' radiator figure.
| Identifier | ExFiles\Box 16\2\ Scan094 | |
| Date | 24th September 1936 | |
| + 7250 ANALYSIS OF EFFECT OF ALTITUDE ON STANDARD "AIR TEMP. TO BOIL" RADIATOR FIGURE. For given radiator dissipating constant amount of heat, Let To = air temp. to boil at ground level " T = " " " " given altitude " B = boiling point of water at given altitude " t1 = top water temp. at ground level " t2 = bottom " " " " } These temps. being corrected to 0°C. " t = mean " " " " " to = air temp. at given altitude " d = ratio of air density at given altitude to air density at sea level For equal heat dissipation, temp. difference between mean water and air = t/d .. actual mean temp. = t/d + to Also temp. drop across rad. = (t1 - t2) / d .. Top water temp. = { t/d + to } + 1/2 { (t1 - t2) / d } .. Air temp. to boil = T = B - { (t1 - t2)/2d + t/d + to } + to = B - { (t1 - t2)/2d + (t1 + t2)/2d } - to + to since t = (t1 + t2)/2 = B - t1/d | ||