Also in the refrigeration process there will be other sounds, refrigerant circulating inside the flow will be gurgling sound, etc..
1, compression refrigerator: it is through the compressor on the refrigeration system to work, the refrigerator refrigeration system using below boiling point refrigerant in the evaporator into vapor for heat absorption principle made.
2, absorption refrigerator: this kind of refrigerator can be used as a power of electric heating element, the use of ammonia hydrogen mixed solution of continuous absorption of heat diffusion way to send to the purpose of refrigeration, its refrigeration efficiency is low, the cooling speed is relatively slow.
3, semiconductor refrigerator: it is the use of PN-type semiconductor through the DC current generated above the junction of the utility to use the principle of the Peltier effect to achieve refrigerator refrigeration.