Accumulator for storing heat or cold

In latent-heat storage accumulators in which a liquid heat exchange medium is directly contacted with a eutectic mixture which is immiscible therewith one often encounters the problem that the exchange liquid entrains droplets and crystals of eutectic mixture and these droplets then freeze and accumulate in coolers outside the accumulator, interrupting proper operation. According to the invention these droplets and crystals are retained by means of a coalescer. Attempts to filter them out by common filtering methods failed.