Matt
Since you are using a new water utility you may be able to make up some of the difference by increasing its flow over the current CW supply rate. But if the hotside Delta_T is fixed at 9, you won't be able to get all of the way there. At a 15F cold-end approach, you would need a 27F delta...
I see two immediate areas of concern. Here are the questions that I would ask if it were proposed to me.
1. Can over-performance (e.g. clean condition or extra-cold process supply temp) occur in the first shell that will reduce the heating medium temperature to the second shell? Can the...
