Seasonal storage of solar energy for house heating by different absorption couples

International audienceThe aim of the project is to develop long-term energy storage equipment for house heating using absorption. Solar energy is stored in summer through desorption and heat is released in winter through absorption. The originality of this concept is to allow the solution to reach the crystallisation point, which is usually avoided in the absorption refrigeration machines. The potential energy densities of five absorption couples, LiBr-H2O, LiCl-H2O, CaCl2-H2O, NaOH-H2O and NH3-H2O, have been studied for this project. The storage capacity increases with the concentration after desorption and the temperature of the evaporator and decreases with the temperature of the absorber. The temperature requirement for the solar energy is lower than 135 °C with those couples