An inventor claims to have developed a refrigerator that at steady state requires a net power input of 0.7 horsepower to remove 12,000 Btu/h of energy by heat transfer from the freezer compartment at 08F and discharge energy by heat transfer to a kitchen at 708F. Evaluate this claim.

ENGR 232 Dynamic Engineering Systems Lecture 2 Dr. Michael Ryan This Lecture • Two simple models: object with drag, mice and owls – Solution to D.E. Via separation of variables • Separable differential equations – Analytic Solutions – Closed form – Implicit form » Domain of solution » Qualitative solutions » Numerical solutions • Method of Integrating Factors 4/6/2015 ENGR 232 Winter 14-15 Week 2 2 Falling Objects: Increasing Model Complexity • A hailstone has mass m=0.025 kg an2 drag coefficient =0.007 kg/s. g = 9.8 m/sec • Taking motion d