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A system to supply refrigerant to the coils also challenged Carrier’s engineers. Freon- 12 had been specified as the refrigerant needed to produce a temperature of -67°F. But Freon-12 had never been used in such a large system. Engineers redesigned their cen- trifugal compressors to handle a maximum of 7,150 tons of Freon-12.11 “Much was not standard,” Willis Carrier observed, “nor could it be, for such an unusual installation.” After numerous shakedown difficulties and false starts, the system was ready on 24 April 1944 for a formal run-in test. Carrier was present to watch the innovative system come to life. It worked as designed. Carrier later was to hail this system as his company’s greatest engineering feat.12 In the summer of 1943, as work on the IRT and the refrigerating system con- tinued, AERL created a new division to conduct icing research and hired Willson H. Hunter to take charge of it. Hunter brought extensive icing experience to the task. After The IRT Takes Shape Figure 2–4. Construction of balance frame supporting piers for the IRT, with ventilating tower framing in left background, 5 August 1943. (NACA C-IRT-9) 11 L. L. Lewis, “Carrier in World War II Wind Tunnel Air Conditioning,” 26 September 1956, Records of the Carrier Corporation, 1875–1964, Box 16, Cornell University Library; Ingels, Carrier. 12 Ingels, Carrier; L. L. Lewis to E. T. Murphy, “Wind Tunnel Activity,” 21 April 1944, and W. H. Carrier to Maurice J. Wilson, 3 March 1945, Records of the Carrier Corporation, Box 16. 25PDF Image | History of NASA Icing Research Tunnel
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