Abstract
Experimental studies of multi-row plate-fin heat exchangers show that the highest average heat transfer coefficient on the air side occurs in the first row of tubes when the air velocity in front ofthe exchanger is less thanapproximately 3.5 m/s. In the subsequent rows of tubes up to about the fourth row the heat transfer coefficient decreases. In the fifth and further rows, it can be assumed that the heat transfer coefficient is equal in each tube row. It is necessary to find the relationships fortheair–side Nusselt number on each tube row to design a plate–fin and tube heat exchanger(PFTHE) with the appropriate number of tube rows. The air–side Nusselt number correlations canbe determined experimentally or by CFD modeling (Computational and Fluid Dynamics). The paper presents a newmathematical model of the transient operation of PFTHE, considering that the Nusselt numbers on the air side of individual tube rows are different. The heat transfer coefficient on an analyzed tube row was determined from the equality condition of mass– average air temperature differences on agiven tube row determined using the analytical formula and CFD modeling. The results of numerical modelingwere compared with the results of the experiments.
Highlights
Plate-fin and heat exchangers (PFTHEs) are widely used in air conditioning, heating, and many industries [1-4]
This paper proposes a calculation method of PFTHEs based on the air-side heat transfer correlations, obtained using CFD simulations [12]
The initial-boundary problem formulated by Eqs (1–12) applies to the heat exchangers made of smooth tubes as well as to PFTHEs
Summary
Plate-fin and heat exchangers (PFTHEs) are widely used in air conditioning, heating, and many industries [1-4]. PFTHEs are very widely used in practice For this reason, the number of books and articles in journals concerning their design, mathematical modeling, and experimental studies is very large. The number of books and articles in journals concerning their design, mathematical modeling, and experimental studies is very large Both in the calculation of heat exchangers and in experimental studies, it has been assumed that the heat transfer coefficient (correlation for Nusselt number) on the gas side of each row of tubes is the same [1-4]. This paper proposes a calculation method of PFTHEs based on the air-side heat transfer correlations, obtained using CFD simulations [12]. The method of modeling PFTHEs in steady-state and transient states proposed in the paper together with the method of determining the air-side heat transfer correlations proposed in [12] will significantly reduce the cost and shorten the time of implementation of PFTHEs with new construction and flow system
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
