15. during a power shutdown a room is losing thermal energy at a rate of 1.0-kw due to heat transfer through its walls to the street. find the increase of entropy of a "mini-universe" (the room and the street) during 1 hour, assuming the temperature of the room +20°c does not change noticeably during this time, while temperature in the street outside remains -10°c. a) 1.40 kj/k b) 0.89 kj/k c) 1.68 kj/k d) 1.96 kj/k e) 2.24 kj/k