1. The problem statement, all variables and given/known data How much heat is added over this cycle? During which processes? What is the heat expelled from d to a? 2. Relevant equations http://img838.imageshack.us/img838/6270/29494670.png [Broken] (Goes clockwise, abcda) 3. The attempt at a solution I'm just generally confused overall about this question. Is heat added in the processes which are going "forward"? So would heat only be added during processes a-b and b-c? And would I use Q = dU + W to calculate the heat added for the processes? For the 2nd question, for heat expelled, would I still just use Q = dU + W to find it? So Q = nCvdT + pdV to find the heat expelled for process d to a. Thanks for any clarification and help, I am really lost here.