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Industrial chemical heat pumps (ICHPs) provide an ability to capture low grade heat rejected from industrial sources and to reuse the heat increased temperature in industrial processes. Also it can be used for residential heating, cooling, water heating and energy storage. Several temperature boost levels can be obtained according to chemical reaction couple chosen. It can be either single source system or dual source system connected with available reject heat source. Dual source system is more effective than single source system and higher output temperature levels can be obtained. Reject heat source temperature and desired temperature boost are important in chemical reaction couple selection. Chemical reaction couple must be chosen carefully to provide the highest efficiency in all candidate systems. Economical feasibility of industrial chemical heat pump can be determined after calculations according to heat pump capacity. In this study, economical analysis of an industrial chemical heat pump system was accomplished compared with a steam boiler. Economical calculations was carried out and curves that show the relations between investment cost and capacity of chemical heat pump, investment cost and capacity of steam boiler, reject heat capacity and net savings were obtained for waste heat capacities below 2000 kW. It is determined that the chemical system is feasible if the waste heat capacity is higher than a certain value according to economical parameters and lifetime. Also, net gain increases almost linearly with increasing waste heat capacity.

Economical Analysis of a Chemical Heat Pump System for Waste Heat Recovery