Abstract: The recovery of waste heat has been a topic of concern for large-scale industrial companies for several decades. This recovery not only makes an operation more environment friendly, but it also helps to cut costs. In addition to this, it can reduce the amount of resources needed to power a facility. Many industries have implemented different methods of waste heat recovery. One popular choice is using a heat exchanger. This paper presents the study of two types of heat exchangers: straight and helical coil tube. The helical coil heat exchanger has been experimented and analyzed on the basic of log-mean temperature difference (LMTD), heat transfer coefficient and Reynolds number. Based on the results, it is found that helical coil heat exchangers are efficient and its overall heat transfer coefficient increases with mass flow rate.