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- Anton Remirez, Raul, et al.
(author)
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Detailed CFD Modelling of EMC Screen for Radio Base Stations : A Conjugate Heat Transfer Problem
- 2007
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In: International Journal of Heat Exchangers. - : R.T Edwards Inc.. - 1524-5608. ; 8:1, s. 95-116
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Journal article (peer-reviewed)abstract
- The objective of this paper is to perform an experimental as well as CFD investigations of the conjugate heat transfer problem in a sub-rack slot model. A steady-state three-dimensional detailed model, which serves as the most accurate representation of the model, was used in order to evaluate the details of the airflow paths and temperature field. A general model that covers a considerable range of velocities, screen porosities and heat fluxes was validated experimentally by wind tunnel measurements. The result shows that the RNG k-ε model used with correct y+ and mesh strategy accurately predicts the temperature field. The average temperature deviation at several locations is less than 4% compared to experimental data. The influence of the velocity, screen porosity, heat flux and presence of the EMC screen on the PCB temperature field is commented.
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- Claesson, Joachim, 1970-
(author)
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The influence of brine flow on the flow boiling refrigerant heat transfer coefficient in a compact brazed plate heat exchanger
- 2005
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In: International Journal of Heat Exchangers. - 1524-5608. ; 6:1, s. 35-54
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Journal article (peer-reviewed)abstract
- The present article investigates the heat transfer coefficient on the refrigerant side in an compact brazed plate heat exchanger used as evaporator with different brine flows. The experimental equipment consisted of a test rig, simulating a domestic heat pump. Two different heat loads were tested, 5 kW and 10 kW, which corresponds to approx. 2.5 kW/m2 and 5.0 kW/m 2. The inlet quality to the evaporator was kept within 0.18 - 0.20. The pressure was kept within 2.93 - 2.97 bar(a) and R134a was used as refrigerant. The experiment showed for both heat loads a significant increase in the refrigerant area averaged heat transfer coefficient with increasing brine flow. It may be concluded that the temperature profile on the brine side has a significant influence on the refrigerant area averaged heat transfer coefficient. It is suggested that the higher wall superheat on the refrigerant side near the inlet of refrigerant is enhancing the heat transfer.
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