Abstract
A general correlation for predicting the two-phase heat transfer coefficient (HTC) during condensation inside multi-port mini/micro-channels was presented. The model was obtained by correlating the two-phase multiplier, φtp with affecting parameters using the genetic programming (GP) method. An extensive database containing 3503 experimental data samples was gathered from 21 different sources, including a broad range of operating parameters. The newly obtained correlation fits the broad range of measured data analyzed with an average absolute relative deviation (AARD) of 16.87% and estimates 84.73% of analyzed data points with a relative error of less than 30%. Evaluation of previous correlations was also conducted using the same database. They showed the AARD values ranging from 36.94% to 191.19%. However, the GP model provides more accurate results, AARD lower than 17%, by considering the surface tension effects. Finally, the effect of various operating parameters on the HTC was studied using the proposed correlation.
Highlights
Condensers play important roles in different systems, such as air conditioning [1,2], heat pumping [3], refrigeration [4,5], nuclear [6,7], chemical [8,9], etc
Correlation were 70.37% and 84.73%, respectively. These results showed excellent accuracy of the correlation obtained by the genetic programming (GP) for approximating the condensation heat transfer coefficient (HTC) inside multi-port channels
For the GP correlation were 70.37% and 84.73%, respectively
Summary
Condensers play important roles in different systems, such as air conditioning [1,2], heat pumping [3], refrigeration [4,5], nuclear [6,7], chemical [8,9], etc. The main reasons are reducing the size of the condensers, refrigeration charge, required space, and overall cost of the process [16]. The multi-port mini/micro-channels can raise the contact region between the condenser and the working fluids and leads to a higher evaporating rate as an internal fin [17]. The influence of surface tension becomes important in the smaller channels. The surface tension can decrease the liquid film thickness during condensation in these channels
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