Organic Rankine cycle and absorption heat pump energy system based on valley electricity utilization and molten salt energy storage

In order to effectively utilize valley electricity and reduce energy consumption, a nighttime valley electricity energy storage system based on molten salt was developed. Reduced daytime energy costs are achieved by utilizing the Organic Rankine Cycle and air source absorption heat pumps to release during the day. Through energy analysis, exergy analysis and economic analysis, the performance of the system is evaluated. The results show that the total energy efficiency of the system can reach 50.37%, which is at a relatively high level. Steam turbine and HST are the two equipment with the largest energy loss. The exergy analysis shows that the exergy output of the system is not much different from the heat supply. A simple economic analysis evaluates the difference between using molten salt energy storage during the day and not using molten salt energy storage. The results show that the cost of electricity and heating with energy storage in the valley is only half of that without energy storage.