There are two main types of heat exchangers that are commonly used in the petrochemical, chemical, and food industries, shell and tube or plate and frame. Plate and frame heat exchangers are very efficient due to their large heat transfer area. However, shell and tube heat exchangers are often used in high pressure systems and processes in which the two streams are in different phases. This type of heat exchanger can be used in many different applications such as refineries, chemical industries and food industries (FEIZA 2014). In addition, more than 35-40% of the heat exchangers are shell and tube because extensive research and modeling has be conducted on shell and tube heat exchangers and they require easy and straightforward maintenance (Saeedan and Mehdi 2015). For this experiment, the shell and tube heat exchanger in the Unit Operations Laboratory was used.
In this experiment, a shell and tube heat exchanger with two passes on the tube side and one pass on the shell side was used. The objective of this experiment was to determine three things: 1) the overall heat transfer coefficient at different flow rates of cold and hot water, 2) the effects of adding fiberglass insulation to the shell side, and 3) the number of fouled tubes in the heat