The improvement of the apparatus used to obtain certain high quality products in food industry, cased by the development of the synthesis processes in the past years, brought about the working out of calculations more and more complex as far as their technological dimensioning is concerned. One of these is the plate heat exchanger which, due to its performances, has gained more and more ground lately. The purpose of thy present work is to offer calculating program of the main technological dimensions realized according to a mathematical model which takes into account the maintaining of the two fluids speed within 0.3-0.8m/s on the bases of the known calculus formulae.