BUFFER STORAGE ARRANGEMENT FILLED WITH PHASE CHANGE MATERIAL

The invention relates to a buffer storage arrangement filled with phase change material for storing heat energy, comprising a container (1) having open or sealed configuration, a heat exchanger unit (2) arranged in the container (1), and liquid-solid phase change material encompassing the heat exchanger unit (2) inside the container (1), wherein the heat exchanger unit (2) comprises pipe coils (21, 22) formed from bent pipes and heat exchanger fins (23) adapted for interconnecting the pipe coils (21, 22), wherein each pipe coil (21, 22) is situated along a respective imaginary plane, the imaginary planes being arranged parallelly beside one another, and the heat exchanger fins (23) are arranged aligned with the cross-sectional (24) direction of the pipes of the pipe coils (21, 22), substantially perpendicular to the imaginary planes of the pipe coils. The arrangement according to the invention is characterized in that the cross- sectional area of the container (1) is essentially filled by the heat exchanger fins (23) such that fluid communication between the walls (11, 12, 13, 14) of the container (1) and the heat exchanger unit (2) is provided in order to balance inhomogeneities between the spatial regions (15) separated by the heat exchanger fins (23).