Industrial processes often encompass a wide range of temperature and different heat cold fluxes in any one particular production site. If supply and demand exist simultaneously, heat exchanger can be used very efficiently. In many cases however supply and demand vary in time and quantity. Instead of using energy efficiently, electricity is often used to generate heat and cold on the spot, just where and when it is needed. This is convenient, but inefficient in economical and ecological terms. Heat and cold stores can fill this gap and match supply and demand with respect to availability in time and power. The concept of using PCM for the application for the thermal energy storage in industrial process is not new, PCM is the substance with a high heat of fusion with which melting and solidifying at certain temperature, is capable of storing and releasing large amount of energy. In PCM organic materials like paraffins are cheap and have moderate thermal energy storage density but low thermal conductivity and hence require large surface area. Hydrated salts have a larger energy storage density and higher thermal conductivity. In response to increasing electrical energy cost and desire for better led management, thermal storage technology has recently been developed. The storage of thermal energy in the form of sensible and latent heat has become an important aspect of energy management with emphasis on efficient use and conservation of waste heat and solar energy in industry. This paper presents a simplified methodology for analyzing the effectiveness of heat exchanger using three PCM fluids from different groups. Paraffin liquid- organic Calcium chloride – Hydrated salt Water – conventional fluid