*Result*: A graphical method for Heat Exchanger Storage Network synthesis to decarbonise the non-continuous industrial processes.

*Practical implementation of indirect heat integration for non-continuous processes is limited compared to direct heat integration of continuous processes, due to requirement of heat storage units, a greater number of heat exchangers and more complex of heat recovery network. To promote the implementation of indirect heat integration in the industries, this paper proposes a new graphical methodology to synthesise the cost-effective Heat Exchanger Storage Networks (HESN) for non-continuous processes, which integrates both Heat Exchanger Network (HEN) and Thermal Energy Storage System (TESS) together using the Batch Stream Temperature Enthalpy Plot (Batch STEP). Batch STEP adapts and extends the STEP tool for the Heat Exchanger Network (HEN) synthesis and retrofit of continuous processes. Compared to other graphical and mathematical modelling approaches, Batch STEP provides valuable insights to determine the number and operating temperatures of the Heat Recovery Loops (HRLs), as well as allows the flexible selection of the process heat sources and sinks to be integrated into the appropriate HRLs in synthesising the HESN. The systematic procedures of mapping the individual processes in Batch STEP, synthesising the HESN based on the Batch STEP and sizing of heat storage units (HSUs) using Volume Problem Table Algorithm (Volume PTA) are described in this work. Application of the proposed methodology on an illustrative case study resulted in hot utility savings of 78.8%, cold utility savings of 77.9% and greenhouse gas emission reduction of 78.8% via a HESN with payback period of 2.72 years. This work is expected to empower the users to synthesise the HESN in a user-friendly and cost-effective manner to support the decarbonisation for non-continuous industrial processes. [ABSTRACT FROM AUTHOR]

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