The energy consumption of a refrigerator depends not only on the efficiency of compressor itself, but also on the capacity modulation. The capacity of linear compressor has not been modulated successively yet, while the linear compressor has high efficiency. Therefore we have studied following several methods of capacity modulation for the linear compressor. For those methods we used triac based drive instead of inverter drive which is usually used for capacity modulation in reciprocating compressor. (1) Clearance Volume Adjustment Method; (2) Line Driving Method; (3) Swept Volume Adjustment Method; (4) Two Stage Compression Method; (5) Two Compressor Method. We compared the efficiencies of those methods and found which is the most effective for the energy saving in the household refrigerator.
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