This paper studies numerically the influence of the louver's fin thickness on heat transfer and flow performance of a parallel flow evaporator, a comprehensive evaluation and analysis of the five structures at different Reynolds numbers are systematically carried out. Comparison of the numerical results with the experimental data shows good agreement with maximal errors of 12.16% and 5.29% for the heat transfer factor and the resistance factor, respectively. The results show that the heat transfer coefficient and the pressure drop increase with the increase of the thickness of the louver fins when the Reynolds number is a constant. The analysis of the comprehensive evaluation factor shows that the A-type fin is the best, and it can effectively strengthen the heat exchange on the air side and improve the heat transfer capacity of the system. The research results can provide reference for the structural optimization of the louver fins.
In view of the current test methods and evaluation indicators for the
performance of cold storage freezing systems, a cold storage experimental
platform with a micro-channel heat exchanger is designed using the inject
technology, and the power consumption and cooling performance are tested
under different conditions of the internal and external environment
temperatures, vapor injecting flux, compressor speed, and vapor inject
pattern. The experimental results provide us with a useful source for the
optimization or improvement of cold storage freezing systems.
To improve the fuel efficiency of automobile engines and reduce pollution owing to automobile exhaust, this study discusses a fixed-curvature spiral-coil heat exchanger that recovers exhaust heat. Herein, the heat transfer performance of the spiral coil is studied via experimental testing and numerical simulation. In this study, a new type of variable-curvature spiral coil is designed to improve the efficiency of the heat exchanger. The effect of different conical angles on the resistance and heat transfer performance of the spiral coil within a range of Reynolds numbers of 4000–14,000 was analyzed. The heat exchange efficiency is a combination of the convective heat transfer and the overall heat recovery. The results of this study indicate that for a spiral-coil tube of length L, increasing the cone angle improves the convective heat transfer outside the tube. However, as the flow resistance increases, the exhaust heat recovery of a variable-curvature spiral-coil heat exchanger (VSE) is up to 18.8% higher than that of a constant curvature spiral-coil heat exchanger. The combined performance of VSE is excellent when the cone angle is 15 deg.
The influence of the louver fin's structure on the heat transfer performance of a parallel flow gas cooler is studied, and a 3-D model for an elliptical louver fin is simulated for analysis of the heat transfer and flow resistance characteristics of the fin. The micro-channel structure of the fin is optimized to give the best comprehensive performance evaluation by suitable choice of fin's thickness and the space between the adjacent louvers for given range of Reynolds number.
In order to study the influence of the louver angle on the heat transfer and
flow resistance characteristics of a parallel flow heat exchanger, this
paper establishes five calculation models including a uniform angle model
and four variable angle models for comparing and analyzing the temperature,
velocity, and pressure fields, and evaluates their comprehensive
performance. The results show that the suitable choice of the v louver angle
can lead to an optimal heat transfer effect and a best comprehensive
performance.
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