STUDY ON DYNAMIC OF DOUBLE-PIPE HEAT EXCHANGER

In this work it has been attempted to study the dynamic behavior of a double pipe heat exchanger both experimentally and theoretically. The double pipe heat exchanger configuration simulated consisted of two
concentric pipes, the outer pipe carries the hot fluid and the inner pipe carries cold fluid and the circulation of the two fluids is made by two pumps. The influence of the following variables studied are the flow
rate of hot and cold streams as follows: effect of flow rates of hot stream of 500, 700, 900, and 1100 L / h on the exit hot fluid temperature and also the same range of flow rates for the hot stream is studied as an effect on the exit cold fluid temperature. Firstly the results were obtained from the experimental work for steady state and dynamic results and secondly a mathematical model was constructed to get the transfer function for both the effect of cold fluid flow rate on the exit hot temperature and effect of hot fluid flow rate on the exit cold fluid temperature at which a step in the flow rate is applied to obtain the following expressions for the exit temperatures: