ME 3333 Chapter : Homework 4 Solutions Fall 2012
Document Summary
Heat transfer to a block of 1. 5 kg ice at -10oc melts it to liquid at 10oc in a kitchen. Work is done against the atmosphere due to volume change in the process. State 1: compressed solid, b. 1. 5, v1 = 0. 0010891 m3/kg. State 2: compressed liquid b. 1. 1 v2 = 0. 001000 m3/kg. = pdv = po (v2 v1) = po m (v2 v1) = 101. 325 kpa 1. 5 kg (0. 001 0. 0010891) m3/kg. Notice the work is negative, the volume is reduced! Mass is added at such a rate that the gas compresses according to the relation pv1. 2 = constant to a final temperature of. 4. 4 for the polytopic process pvn = const ( n =/ 1 ) The setup is allowed to cool to the ambient temperature of 20 c. P1 = 150 kpa, t1 = 400 c = 673. 2 k. T2 = t0 = 20 c = 293. 2 k.
