under heat exchanger design .thanks
The question is not clear. What heat integration scheme. More details would help. Your additional details just asks the original question over with no more info so I'll take a stab at your question. In using steam as a heat medium you want the lowest temperature that will satisfy your requirements. That typically is the lowest cost for the energy involved. Since steam temperature goes up with pressure you would then want the lowest pressure steam to achieve the temperature level you need for the heat exchanger design. Typically an approach temperature of about 5 degrees F is the economic limit for a given exchanger but you can by doing cost estimates determine if that is true for the case you might be studying.
