22 May 2008

RESEARCH ON ROTARY POROUS WHEEL MAGNETIC HEAT PUMPS IN SWITZERLAND


Since the discovery of the “giant” magneto caloric effect in 1997 magnetic heating
and refrigeration reveals a realistic potential to enter some markets with machines based on
the rectilinear or rotational operation principle. The Swiss Federal Office of Energy demanded
a feasibility study to evaluate the efficiency and cost of a magnetic heat pump operating
in a minimal energy house (Minergy house). This system operates between a ground heat
source and a floor heating system and, therefore, shows the following characteristic data:
heating power 8 kW, source temperature 0°C, sink temperature 35 °C. This technical and
economic study reveals that a magnetic heat pump has a higher efficiency than that of a
conventional compression/expansion heat pump. The price obtained for such a magnetic
heat pump – with the assumption of a basic cost of magneto caloric material of 125 Euro/kg
– is estimated to be approximately 30 % higher than that of a conventional one.