Chapter 8 – Integration of Combined Heat and Power Systems

The integration of thermal energy through the synthesis of heat-exchange networks is a key element of an effective energy management strategy. As discussed in Chapter 7, Heat Integration, substantial savings in heating and cooling utilities can be achieved via the implementation of heat integration in industrial facilities. In addition to heating and cooling, other forms of energy should also be considered. Therefore, in addition to heat integration, it is also important to consider the more general concept of energy integration. One way of defining energy integration is that it is a holistic approach to the design and operation of energy systems involving the generation, allocation, transformation, and exchange of all forms of energy including heat and work (or heat rate and power when the system is studies on a per unit-time basis). The objective of this chapter is to present the principal aspects of energy integration with focus on the integrated design of heat and power systems, which is commonly referred to as combined heat and power. First, the concepts of heat engines and heat pumps are discussed. Key thermodynamic cycles are also described and integrated with the thermal pinch analysis. Then, design rules are given for the placement of heat pumps and heat engines. Next, a systematic approach is given for the targeting of cogeneration systems dispensing process heating and power.

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