From the post:
Scientists at the Technical University of Denmark created a refrigerator that uses magnets to cool instead of electricity by finding a cooling method which uses magnetic materials instead of electricity.
Frankly, I don't think the writer knows what s/he is writing (although the source is from Ministry of Foreign Affair, Denmark). First of all, magnetic material is physical objects (like a magnet for example) and electricity is a form of energy. I cannot see how a material can replace energy without replacing the material after the energy stored in the material has been depicted. Like you can use a battery to store electrical energy, you need to replace or recharge the battery when its stored energy is used up.
In term of increasing the efficiency of refrigerator, use a horizontal door for a refrigerator . The density of cool air is higher than hot air, every time we open a refrigerator with a vertical door, cool air from the refrigerator flows out and hot air gets in. Energy is needed to remove the heat that gets into the refrigerator. By using a horizontal door (like a deep freezer), as you open the refrigerator, no cool air gets out. The need of maintaining the low temperature requires minimum energy. I have reported that Tome Chalko at Mt. Best Australia has converted a freezer into a refrigerator which consumes about 0.1 kWh a day.
Labels: wrong concepts