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 temp. to boil' radiator figure.
| Identifier | ExFiles\Box 105\1\ scan0208 | |
| Date | 24th March 1934 | |
| 45250 24.3.34 ANALYSIS OF EFFECT OF ALTITUDE ON STANDARD "AIR TEMP. TO BOIL" RADIATOR FIGURE. For given radiator dissipating constant amount of heat, Let T0 = 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 } These temps. being corrected to 0°C. " t2 = bottom " " " t = mean " " " t0 = 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 + t0 Also temp. drop across rad. = (t1 - t2)/d .. Top water temp. = {t/d + t0} + 1/2{(t1 - t2)/d} .. Air temp. to boil = T = B - {(t1 - t2)/2d + t/d + t0} + t0 = B - {(t1 - t2)/2d + (t1 + t2)/2d} - t0 + t0 since t = (t1 + t2)/2 = B - t1/d | ||