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).
Letter from Harrison Radiator Corporation comparing test results of Gallay, Harrison, and Chausson radiator cores.
| Identifier | ExFiles\Box 149a\3\ scan0174 | |
| Date | 16th June 1936 | |
| X1278 HARRISON RADIATOR CORPORATION LOCKPORT, NEW YORK June 16, 1936 Noted - HS{Lord Ernest Hives - Chair}/SDD Mr. C. S. Steadman Messrs. Rolls-Royce Limited Derby, Derbyshire, England Dear Mr. Steadman: Further in reference to the Gallay core which you sent over to us for test, enclosed please find copies of test results. On the small curve 8-1/2" x 11", you will note that we have compared these cores on a MPH basis at 100° temperature difference, whereas the tests which were run in England on a similar core by Messrs. Clayton Still show results obtained between the air and the mean temperature of the water. Also enclosed are curve No. 331 which shows the results obtained with the Harrison .20 x .55 type of core, and curve No. 497 which shows the results obtained from the Chausson-Gallay type of core. Enclosed also is a small chart which shows the method of reading the two larger charts. In connection with the results, you will note that at 20 MPH the Harrison core dissipates 710 BTU as against the Chausson with 687. On the Harrison the airflow is 660 Ft/min. with a static pressure drop of .15, whereas on the Chausson core the airflow is 600 ft. with a static drop of .175 which is high. Again at 60 MPH Harrison dissipates 1505 BTU. with an airflow of 2335 ft/min. and a static of 1.24, whereas the Chausson at 60 MPH rejects 1465 BTU with an airflow of 2105 ft/min. at a static of 1.35 which again is high. However, on a car with a restricted air inlet or a restricted air outlet from under the hood, it is possible that the Chausson core would out perform the Harrison. Concerning the air efficiency at 20 and 60 MPH respectively, the number of BTU/cu.ft. of air put out by the Harrison core is 1.08 and .645. Under similar conditions the Chausson puts out 1.145 and .696, this condition being due to the restricted airflow previously mentioned. Concerning BTU/lb. of core, the Harrison at 20 and 60 MPH respectively puts out 94.8 and 201. Under similar conditions the Chausson puts out 86 and 183. Our calculations show that the Chausson core weighs 8 lbs./sq.ft. of frontal area and the Harrison 7.48 lbs./sq. ft. frontal area, both figures including the Solder weight. The gravity waterflow on the Chausson core is slightly greater than that on the Harrison. HEAT TRANSFER PRODUCTS AVIATION . AUTOMOTIVE . MARINE . INDUSTRIAL RADIATORS . SHUTTERS . OIL TEMPERATURE REGULATORS . CAR HEATERS . THERMOSTATS . HEAT EXCHANGERS | ||