In this paper, the authors propose a calculation algorithm and development of a software in Visual Basic (Visual Studio 2012 express desktop) used in heat transfer studies when different heat exchangers are involved (e.g. helical type triple tube heat exchanger, plate type heat exchanger). It includes the easy calculation of heat transfer co-efficient and followed by the design and simulation of heat exchanger design parameter by inputting general known parameters of a heat exchanger into the developed software “Dairy-heat”. A parametric study is conducted using the software interface to determine the length of tubes or dimensions of heat exchanger.