Q2- Recuperator in Rankine cycle is a heat exchanger that recovers heat from outlet of turbine and transfers it to input stream of evaporator. Recuperator could be used to increase efficiency of Rankine Cycle. Figure 1 shows two Rankine cycles: a) without recuperator b) with recuperator. Adding a recuperator to a 10 MW power generation cycle, can increase efficiency 9%. Recuperator costs 0.96 M$ and requires 72kS/year for repair and maintenance. Considering a life cycle of 20 years, electricity rate of 0.024$/kWh and MARR of 9%: a) Calculate your gain or loss after 20 years when you select Rankine cycle with recuperator. Hint: MARR is applied on both maintenance fees and electricity gains b) Calculate the approximate payback period for the case with a recuperator. (Hint: as you are dealing with MARR in this question you need to use a kind of trial-and-error method to find and calculate the payback period time. Also, you just need to report the range of payback period for example you can report that it occurs between 5-6 years after the start of the project. For MARR calculations: (P/A, I (percent), n (number of years) = (1+1)- EM rator Expander ww Condenser rator Expander Feed Pump Recuperater Condenser Feed Pump Figure 1: a) Rankine cycle without recuperator b) Rankine cycle with recuperator