Aalto University Foundation Sr

Elektrobit Testing Oy

Ari Seppälä

Tommi Jämsä

Torsti Poutanen

Juha Kemppainen

Jussi Harju

Salla Puupponen

Juha Meinilä

The present invention relates to a cold-crystallizing material having high latent heat, and a method of using the present material for heat storing. The material of the invention comprises of a phase change material and an additive which is preferably a hydrophilic polymer matrix. Preferably, sugar alcohols, such as erythritol or D-mannitol, are used as the phase change material. The polymer of the invention is preferably cross-linked and ionic, i.e. a polyelectrolyte. PCM stores a high amount of heat energy while melting and releases the stored thermal energy by cold-crystallization. Compared to previously studied cold-crystallizing materials, the latent heat of the cold-crystallizing material of the invention is considerably higher, and cold-crystallization is more repeatable in successive melting-crystallization cycles. The material can be used for heat storing. Heat energy can be released from the material by a heat pulse on demand. The method is particularly suitable for long-term heat storing.

Cold-crystallizing material and method for utilizing cold-crystallization in heat storing

The invention relates to a method and device for performing channel simulation, the device comprising a set of channel simulation units (to) for simulating a radio channel, each unit comprising radio frequency parts (A toA) and baseband parts (B toB). In the solution of the invention, the baseband parts of several different units (to) are arranged to simulate the same channel.

Method and device for simulating radio channel

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Espoo, Finland

Ari Seppälä