3. A company needs to raise the temperature of a process stream from 22C to 75C before placing it in a reactor for the next process step. The process stream flow rate is 15,200kg/h& the stream's heat capacity is 3275J/kgC. (a) How much heat must be supplied to the process stream to achieve the desired temperature? (b) Assuming that there is a 15,000kg/h waste heat source ( at 85C ) that could be used to heat the process stream, and that the heat exchanger has a heat transfer coefficient of 2kW/m3C, calculate the heat exchanger surface area required. (c) If the heat exchanger is used, what will be the annual energy cost savings from not having to directly heat the process stream? Assume a heating e:nergy cost of $0.06/kW