Given the four process streams below, determine the best scheme for heat integration. Determine the amount of heat that will have to be supplied from a hot utility (e.g., steam) and how much cooling from a cold utility (e.g., cooling water). What must the temperatures of the utilities be? What are the benefits of this heat integration? Assume a 10C minimum approach temperature. Stream 1 2 3 4 Condition Mass flow rate, kg/hr C. (kJ/kg:K) Hot 1000 Hot 250 4 Cold 500 4 Cold 1000 5 Tin, C out, C 180 60 150 30 20 135 80 140