Dynamic Analysis of the Solid-Gas Thermochemical Heat Transformers for Industrial Heat Recovery

– A significant portion of the energy supplied to the industries is dissipated as low, medium, or high -grade waste heat. In the sake of improved energy efficiency and sustainability in the industrial sector s, significant recovery and heat upgrading measures for these waste heat streams are needed. Thermochemical heat transformers (THTs) have emerged as a promising sort of technological solutions for upgrading waste heat streams in industry . Among various types of THTs, solid -gas (SG) species reacting type provides significant advantages, including a higher temperature lift, greater heat storage capacity, and scalability. This study presents a dynamic model of an innovative SG-THT technology under development for waste heat upgrading for process heating applications in the range of 200-300℃, using SrBr2.H2O as the working pair due to its stable chemical properties and high energy density. The system is programmed in Modelica and dynamically simulated to track its chemical reactions within the hydration and dehydration reactors. The results indicate the maximum temperature lift of the system to be 84.59℃ under the considered realistic operational conditions at an overall thermal energy efficiency of 66.65%. The results indicate that the proposed SG-THT system can show a satisfactory performance in transient conditions such as fluctuating off-design loads, start -up, and shutdown demonstrating its capability for making a potential role in the industrial sector decarbonization. This dynamic simulation provides important information for designing the system more effectively to reach better efficiency levels, reducing capital and operational costs, and cope better with use case dynamics.