Use the exact fitting technique to develop an empirical equation for the capacity (Btu/h) of the refrigeration compressor described by the 9-point performance data shown in Table 6.10. What is the range of validity of this equation?

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TABLE P6.10 Mass Flow Rate (lbm/h) of R22 Flowing through a Refrigeration Compressor Condensing Temperature (F) 80 90 100 110 120 -25 617 594 567 531 486 Evaporating Temperature (F) -20 -10 715 946 693 919 667 636 597 -15 824 800 775 746 711 892 863 831 -5 1084 1052 1022 991 959