L K = Problem 2: (10 Points) A ventilation raise is being considered to be driven by an Alimak raise climber. Determine the optimum size of the raise if it will be driven in a rectangular shape with the ratio of the long axis to the short axis is 2:1, and given the following information. = 1,312 ft (400m) 45 x 10-40 lb-min/ft" (8.34 x 109 kg/m) Q = 300,000 cfm (141.6 m/s) Life 25 years Interest on capital 12.5% Taxes, insurance, maintenance Excavation cost $250/yd ($326.67/m) Power cost $0.055/kWh Overall efficiency of mine fan, no LE = 50 ft (15.24 m) = = = 3% = = 75% Determine the following: 1. Determine the cost recovery factor 1 point 2. Determine the annual capital-investment recovery factor including taxes, insurances and maintenance 1 point 3. Convert unit excavation cost 1 point 4. Express annual power cost in units of dollars per hp-yr. 1 point 5. Determine the long axis of the rectangle 1 point 6. Determine dimension of rectangle if long axis to short axis ratio is 2:1 1 point 7. Determine the annual operating cost 1 point 8. Determine annual fixed cost 1 point 9. Determine the area of the opening 1 point 10. Determine the perimeter 1 point L K = Problem 2: (10 Points) A ventilation raise is being considered to be driven by an Alimak raise climber. Determine the optimum size of the raise if it will be driven in a rectangular shape with the ratio of the long axis to the short axis is 2:1, and given the following information. = 1,312 ft (400m) 45 x 10-40 lb-min/ft" (8.34 x 109 kg/m) Q = 300,000 cfm (141.6 m/s) Life 25 years Interest on capital 12.5% Taxes, insurance, maintenance Excavation cost $250/yd ($326.67/m) Power cost $0.055/kWh Overall efficiency of mine fan, no LE = 50 ft (15.24 m) = = = 3% = = 75% Determine the following: 1. Determine the cost recovery factor 1 point 2. Determine the annual capital-investment recovery factor including taxes, insurances and maintenance 1 point 3. Convert unit excavation cost 1 point 4. Express annual power cost in units of dollars per hp-yr. 1 point 5. Determine the long axis of the rectangle 1 point 6. Determine dimension of rectangle if long axis to short axis ratio is 2:1 1 point 7. Determine the annual operating cost 1 point 8. Determine annual fixed cost 1 point 9. Determine the area of the opening 1 point 10. Determine the perimeter 1 point