This paper presents a systematic method of determining approximate characteristic values pertaining to crossflow heat exchangers of the bare-tube bundle type. Only the case of turbulent flow has been taken into consideration. The method described allows rapid computation of entire families of heat exchangers having the same requirements with regard to heat-transfer and pressure losses. The basic idea of this method is not confined to the aforementioned type of heat exchanger and flow pattern. The interested reader will immediately recognize that the method can be adapted to other configurations.