You are employed as a draughtsperson by a drafting firm that specialises in providing design services on complex metal and plastic casting. you are tasked with investigating and analysing the design features of existing castings and required to design and improvements to a selected casting which could be one or more of the following.

improved efficiency
to strengthen it's current design
to simplify it's application

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?