As natural resources are becoming limited and energy price dramatically increased, energy utilization with efficient systems is required to be used in desalination technologies. Freezing is a well known technique for water desalination. In the present paper, a new proposed system depends on optimization of utilizing the heat flow of heat pump system to increase the whole system efficiency is introduced. The suggested system overcomes a lot of disadvantages of traditional freezing methods of desalination like ice handling, special compressor types, etc. In the suggested system, the ice washing and melting process occur at the same place of formation by reversing refrigerant flow through the vapor compression cycle so there is no need for ice handing mechanical systems. A detailed description of the system and thermal analysis are represented with simple cost analysis. Cost comparing with other methods gives a promising lower cost for the suggested system with respect to other systems.