Saving energy is a vital issue in industrial processes in these days. In order to produce the milk products, many exchangers and so much thermal energy are used in dairy industries. Plate heat exchangers play an important role in these industries due to their desirable characteristics such as increasing the heat transfer rate and easy cleaning. Using the nanofluid, which is a suspension of nanoparticles in a base fluid, is the newest way to enhance the heat transfer rate in these days. In order to enhance the heat transfer capability of water as a hot stream in Plate Heat Exchangers, Titanum dioxide (TiO2) nanoparticles with sizes of smaller than 50 nanometers were added into the water. The experimental results clearly indicated that heat transfer coefficient of pure water increased by adding TiO2 nanoparticles with weight concentration of less than 1% wt. this parameter as a key parameter in heat transfer, increased as Peclet number and weight concentration percent of nanoparticles were increased as well.

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