THERMAL DYNAMIC ANALYSIS OF PARALLEL AND COUNTER FLOW HEAT EXCHANGERS

Dynamic models that describe the change of hot and cold fluid temperatures across the length of the heat exchanger are presented in this paper. The goal of heat exchanger dynamic analysis is to relate the inlet and outlet temperatures, and the rate of heat transfer between the two fluids. The dynamic models have been created to allow optimizing and controlling the heat exchanger. By utilizing these models, predictions can be made about how altering the independent variables of the system will change the outputs. The model uses ordinary differential equations (ODEs) to describe the process and, using a program Mathcad, gives plots of the variables versus time for the process. The model is for a double-pipe heat exchanger that has the ability to flow in parallel (co-current) or counter-current configurations.