I attached the HW assignment. Its question number 2. I choose a control volume including the cooling stream from the lake and the fluid being condensed. I assumed with this CV that the heat generated was 0 and that the net Work was 0. Using these assumptions I solved for the mass flow rate and I got a number that seemed totally unreasonable... M= 4484.5 Kg/s .. Anyone have any suggestions? is it okay to assume the net work is 0?