2012
DOI: 10.2478/v10173-012-0008-x
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Heat transfer during condensation of refrigerants in tubular minichannels

Abstract: The present paper describes the results of experimental investigations of heat transfer during condensation of R134a, R404A and R407C in pipe minichannels with internal diameters 0.31-3.30 mm. The results concern investigations of the local heat transfer coefficient. The results were compared with the correlations proposed by other authors. Within the range of examined parameters of the condensation process in minichannels made of stainless steel, it was established that the values of the heat transfer coeffic… Show more

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Cited by 21 publications
(21 citation statements)
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“…Static and dynamic disturbances may upset the structure of the distribution of heat transfer regions. This includes a reduction of the active region of condensation, where the heat transfer coefficient reaches its highest value, as reported by Bohdal et al [34].…”
Section: Introductionmentioning
confidence: 55%
“…Static and dynamic disturbances may upset the structure of the distribution of heat transfer regions. This includes a reduction of the active region of condensation, where the heat transfer coefficient reaches its highest value, as reported by Bohdal et al [34].…”
Section: Introductionmentioning
confidence: 55%
“…We can evaluate the integral given in Equation (11) or any by using Schwinger's trick to turn the integrand into a Gaussian (see Figure 1):…”
Section: Applications Of the Green Functionalmentioning
confidence: 99%
“…The selected elementary section PAQB can be divided into four linear sections, called PB, AQ, BQ and AP. For any of these linear sections, the solution of the differential equation (12) and its combination with the integral criterion of Green, allows obtaining an integral complex, which allows solving the problem on the studied boundary at any point inside and outside the volume of control, [10][11]:…”
Section: Figure 2 Model Problem and Elementary Volumes Employedmentioning
confidence: 99%
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“…The measure of the effectiveness of this intensification is increase of the heat transfer coefficient. It can be said that the construction of modern refrigeration and air conditioning heat exchangers should meet the technical and environmental criteria, like: compact dimensions, high heat transfer efficiency, and minimal impact on the environment [3,4,13].…”
Section: Introductionmentioning
confidence: 99%