Aerodynamic resistance of heat exchangers
Annotation
Aerodynamic resistance affects the performance of plate fin-and-tube heat exchangers. As air speed increases, the pressure drops and energy consumption for its movement increases. Both indicators depend in a complex way on the combination of design and operating parameters of heat exchangers. Experimental data on the aerodynamic resistance of heat exchangers with different geometric parameters have been collected from available sources. 21 correlations were used to calculate the Fanning factor or pressure drop. Calculations of the pressure drop were performed by each correlation over the entire range of geometric and operating parameters, which are indicated in the sources describing the experimental data. Calculations were carried out using a program compiled in MS Excel. Current ΔPi and average ΔPсpressure drop values were compared with experimental data ΔPэ.iand ΔPэ.с. Only two correlations provide satisfactory agreement between calculation results and experimental data in a wide range of geometric parameters. A multiple linear regression analysis of experimental data was performed for all of them and separately for heat exchangers with staggered and in-line tube arrangements. For each of them, the agreement between the calculation results and experimental data is better than for the selected correlations. On the graphs of the ratio ΔPi/ΔPэ.ioutlier points are found, which indicates the inconsistency of the experimental data obtained by different researchers. More experimental data is required for more accurate pressure drop calculations, especially for heat exchangers with fin pitch greater than 4 mm.
Keywords
Постоянный URL
Articles in current issue
- Heat exchange during solid–liquid formic acid phase transitions in relation to the creation of cold storage batteries
- Structural and parametric optimization of ducted supply and exhaust ventilation. Part 2
- Operating process of a refrigeration low-speed compressor with intensive cooling
- Prediction of parameters for boil-off gas in cryogenic tanks. Part 1. Modelling methods.
- Technology of a functional drink for preventing iron deficiency in the human body
- Technology of truffle-type candies for the nutrition of people with an increased risk of cardiovascular diseases
- Improving recipes for gluten-free bread on buckwheat sourdough
- The effect of the parameters of enzymatic hydrolysis of chickpea flour on the degree of destruction of vegetable carbohydrates and protein yield during the preparation of the isolate
- Full factorial experiment to determine optimal technological modes in the production of enzymed canned pond fish
- Restoration of water temperature using a submersible measuring complex by solving the nonlinear nonstationary inverse heat conduction problem using the parametric identification method
- Influence of particle fractional composition on viscosity of malt suspensions during their water-heat treatment
- Требования к рукописям в журнал «Вестник МАХ»