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analysis on the condensation of HFE 7000/HFE 7100 refrigerants was performed in a compact heat exchanger [thirty]. The paper provides a dimensionless dependence on analyzing the value with the HTC for the duration of condensation with the refrigerant on a horizontal bundle of pipes in the form, as follows:
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The heat exchange coefficient little by little improves While using the heat flux density. nevertheless, a four-fold increase in q brings about merely a 10% rise in the value from the α within the cooled area.
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The attained measurement results authorized us to find out the remaining quantities by calculation, characterizing the heat Trade while in the HX, including the heat exchanger electrical power Q ˙
To confirm the scope of applicability of the existing product describing the community Nusselt number throughout refrigerant condensation on minichannels, the residual analysis process, using the MAPE error (mean complete percentage error), was utilised M A P E = one n ∑ i = one n N u t h − N u e x p N u e x p × a hundred %
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and K would be the condensation section transmission describing range [34] K = r c p ′ Δ T
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The conducted study offered numerous portions describing the heat Trade in compact heat exchangers, together with heat exchanger heat electricity, heat Trade coefficient, and heat Trade coefficients for Operating media. dependant on these things, the thermal overall performance on the heat exchanger was described. External attributes include the value with the thermal power plus the heat exchange coefficient as being a purpose from the mass flow density of the Functioning medium and the normal logarithmic temperature big difference. The functionality from the heat exchanger was introduced as the dependencies in the heat Trade coefficients over the mass flux density along with the heat flux density around the heat Trade floor. The thickness of the refrigerant’s condensate movie was also established. Also, a product was proposed to determine the heat Trade coefficient worth with the condensing HFE7100 refrigerant around the outer surface of the bundle of smooth tubes within a compact heat exchanger. In line with experimental facts, the calculation results have been in good arrangement with one another, with A variety of 25%. These details can be utilized to design mini condensers which can be widely Employed in observe.
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It is shown the values on the heat exchanger’s thermal electric power (heat flux) count on the sort of coolant. the very best values have been noticed in the course of cooling with 10% mPCM slurry. In addition, the lowest heat flux values had been pointed out for drinking water cooling. It was also uncovered that the heat flux increases through the PCM period transition (in the temperature variety of 24–26 °C); the influence of mass share on the worth of heat flux was also noticed.