Answer Happy

1. Solve the following. a.) During a steady flow process, the pressure of the working substance drops from 200 to 20 psia, the speed increases from 200 to 1000 fps, the internal energy of the open system decreases 25 Btu/lb, and specific volume increases from 1 to 8 cu.ft/lb. No heat is transferred. Sketch an energy diagram. Determine the work per 1b. Is it done on or by the substance? Determine the work in hp for 10 lb per min. (1 hp = 42.4 Btu/min). b.) Steam is supplied to a fully loaded 100-hp turbine at 200 psia with u, = 1163.3 Btu/lb, v, = 2.65 cu.ft/lb and V, = 400 fps. Exhaust is at 1 psia with uz = 925 Btu/lb, v2 = 294 cu.ft/lb and V2 = 1100 fps. The heat loss from the steam in the turbine is 10 Btu/lb. Neglect potential energy change and determine (a) the work per lb steam and (b) the steam flow rate in lb/h.