Nowadays heat exchangers consisting of tubes and plate fins have many engineering applications such as air contioning systems, radiators, etc. The present work is a theoretical-experimental thesis about one and two row tubes and plate fins heat exchangers. By means of a two-simensional analysis performance, and using local heat trasnfer coefficients, the plate fin temperature distrubution, the air bulk temperature along the stream path and the fin efficiency can be obtained, for several Reynolds numbers and fin materials. Using heat-mass transfer analogy, the local mass transfer coefficientes measured by Saboya and Sparrow 2, 3 and 6 were transformed into local heat trasnfer coeficcients. This analogy employs an exponent usually unknown. An experiment was accomplished, and data was collected for the calculus of such exponent in the case of two row tubes heat exchangers, confugurations. Herein are also presented the average heat trasnfer coefficientes for isothermal plate fins, referring to heat exchangers with central-tube and rear-tube row and two-row tubes heat exchangers configurations. It is possible to obtain the real tax or the real area of heat trasnfer, using the average heat trasnfer coefficients for isothermal plate fins and the fin efficiency.