An optimization design method of a plate-fin heat exchanger is presented in this paper based on the entropy generation minimization principle. In the method, the specific entropy generation rate is proposed as an objective function. It is used to optimize the geometrical parameters of a real plate-fin heat exchanger which is subject to the finite total heat transfer area. The developed model considers the entropy generation rate due to both the irreversible heat transfer and pressure drop. The analytical results show that under given conditions, the minimum specific entropy generation rate can always be achieved by optimally allocating the finite heat transfer area between the hot- and cold-side heat transfer channels
with certain heat transfer rate requirement being satisfied. With an optimal heat transfer allocation ratio, the corresponding optimal values of main geometrical parameters of the heat exchanger, i.e.,fin height and fin spacing can be found. Furthermore, the values of the total heat transfer area, heat transfer rate, as well as the mass flow rate ratio between cold- and hot-side fluids also have significantly influences on the specific entropy generation rate and optimal heat transfer area allocation ratio. The specific entropy generation rate decreases, whereas, the optimal heat transfer
allocation ratio increases (i.e., the hot-side heat transfer area increases) with increasing the total heat transfer area, decreasing the heat transfer rate and increasing the mass flow rate ratio of cold- and hot-side fluids. The proposed optimization model and analytical results could provide theoretical guidance for real plate-fin heat exchanger design and optimization.
An optimization design method of a plate-fin heat exchanger is presented in this paper based on the entropy generation minimization principle. In the method, the specific entropy generation rate is proposed as an objective function. It is used to optimize the geometrical parameters of a real plate-fin heat exchanger which is subject to the finite total heat transfer area. The developed model considers the entropy generation rate due to both the irreversible heat transfer and pressure drop. The analytical results show that under given conditions, the minimum specific entropy generation rate can always be achieved by optimally allocating the finite heat transfer area between the hot- and cold-side heat transfer channels
with certain heat transfer rate requirement being satisfied. With an optimal heat transfer allocation ratio, the corresponding optimal values of main geometrical parameters of the heat exchanger, i.e.,fin height and fin spacing can be found. Furthermore, the values of the total heat transfer area, heat transfer rate, as well as the mass flow rate ratio between cold- and hot-side fluids also have significantly influences on the specific entropy generation rate and optimal heat transfer area allocation ratio. The specific entropy generation rate decreases, whereas, the optimal heat transfer
allocation ratio increases (i.e., the hot-side heat transfer area increases) with increasing the total heat transfer area, decreasing the heat transfer rate and increasing the mass flow rate ratio of cold- and hot-side fluids. The proposed optimization model and analytical results could provide theoretical guidance for real plate-fin heat exchanger design and optimization.
การแปล กรุณารอสักครู่..
