prof. dr. ir. Stevens Christian
Development of a low-energy chemical heat pump for low temperature industrial waste heat
In Europe about 60 GW of low temperature waste heat is dissipated every year to the environment. About 30 GW is between 120 and 150°C and is equivalent to the energy of about 10.000 windmills. Based on the system that is used in nature to store energy by shuttling phosphate between ADP and ATP, a method has been developed on the oligomerisation of phosphoric acid derivatives to store energy. Using the waste heat, phosphoric acid derivatives are oligomerised, after which the heat is set free again after hydrolysis. By aqueous hydrolysis, the heat is released very fast leading to temperatures up to 210°C. The yield of the system is between 45 and 50%. The system is operationally simple and only requires an input of electrical energy of about 2%.
The chemical heat pump is of high industrial value. The business case shows a return on investment within 3 to 4 years. The system is applicable for various sectors that have drying activities and or need to balance energy requirements.