Page No 271 – Heat pump and thermal energy storage integration in non-continuous processes – an application to the food industry – 13th IEA Heat Pump Conference, Jeju, Korea
Industrial sectors routinely represent a considerable share of a countries total energy demand. An increasing emphasis is on heat recovery across the sector and reducing greenhouse gases (GHG). Heat pump (HP) integration offers the potential to realize energy efficiency and GHG reduction, but is often challenging as a significant portion of energy demand is allocated to non-continuous processes. Consequently, heat recovery measures involving thermal energy storage integration are frequently the only option to recover heat indirectly. Additionally, careful consideration of available condensation and evaporation duties using the grand composite curve, and HP operational parameters such as evaporation and condensation temperatures, are required to perform HP integration within the system. A practical procedure for combined heat pump and thermal energy storage (HPTES) integration into non-continuous processes is presented. HPTES parameter selection is addressed using a graphical approach based on pinch analysis. The approach is demonstrated through application to a candy production plant, which produces in three daily shifts of similar duration and procedure. Up to 74.1% utility reduction can be achieved through HPTES integration, with internal rate of return of 11%.