Odvajanje pare kao jedan od načina za poboljšanje funkcionalnosti sistema sa mikrokanalnim isparivačima sa naglaskom na povratnom toku rashladnog fluida
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Jan 24, 2017
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Ovaj članak predstavlja koncept bajpasa pare nastale pri prigušivanju (flash – ‘gas bypass) kao načina da se popravi raspodela u mikrokanalnom isparivaču kao i fenomen periodičnog povratnog toka i fluktuacije pri isparavanju koji je otkriven u eksperimentima sa mikrokanalnim isparivačima u klimatizacionim sistemima sa R134a. Simultana vizuelizacija i merenje potvrdili su periodičnost povratnog toka. On izaziva oscilacije ulaznog pritiska u isparivač kao i pada pritiska. Amplitude i učestanost oscilacija pojačavaju se sa toplotnim opterećenjem. Potencijalne posledice povratnog toka su: umereno loša raspodela tečnosti, smanjen koeficijent prelaza toplote, povećan pad pritiska. Konačno, za smanjenje uticaja povratnog toka predloženo je rešenje otparavanjem povratne pare iz ulaznog kolektora.
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HRNJAK, Predrag Pega.
Odvajanje pare kao jedan od načina za poboljšanje funkcionalnosti sistema sa mikrokanalnim isparivačima sa naglaskom na povratnom toku rashladnog fluida.
KGH – Klimatizacija, grejanje, hlađenje, [S.l.], v. 43, n. 1, p. 75-83, jan. 2017.
ISSN 2560-340X.
Dostupno na: <https://izdanja.smeits.rs/index.php/kgh/article/view/1489>. Datum pristupa: 06 oct. 2026
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Reference
[1] Tompkins, D. M., T. A., Newell, P. S., Hrnjak, 2002, Single phase, two – ‘phase modeling; x – ‘ray visualization for a microchannel manifold distribution system, Technical Report TR – ‘206, Air Conditioning and Refrigeration Center, University of Illinois, Urbana – ‘Champaign, IL.
[2] Bowers, C. D., T. A., Newell, P. S. Hrnjak, 2006, Experimental investigation of two – ‘phase refrigerant distribution in a microchannel manifold, Technical Report TR – ‘245, Air Conditioning and Refrigeration Center, University of Illinois, Urbana – ‘Champaign, IL.
[3] Hwang, Y., D. H., Jin, R., Radermacher, 2007, Refrigerant distribution in minichannel evaporator manifolds, HVAC&R Research, 13(4), 543 – 555.
[4] Zou, Y., 2010, Performance measurement and visualization on the refrigerant distribution in the vertical manifold of the microchannel tube heat exchanger, (Master – ™s Thesis). University of Illinois, Urbana – ‘Champaign, IL.
[5] Jiang, J., X. Lu, and L. Huang, 2010, Refrigerant distributor for heat exchanger, U.S. Patent No 20100242535 A1.
[6] Fei, P., D. Cantrak, P. S. Hrnjak, 2002, Refrigerant distribution in the inlet header of plate evaporators, 2002 SAE World Congress. Paper # 2002 – ‘01 – ‘0948.
[7] Beaver, A. C., J. M., Yin, C. W. Bullard, P. S. Hrnjak, 1999, An experimental investigation of transcritical carbon dioxide systems for residential air conditioning, Contract Report CR – ‘18, Air Conditioning and Refrigeration Center, University of Illinois, Urbana – ‘Champaign, IL.
[8] Tuo, H. F., P. S. Hrnjak, 2012a. Flash – ‘gas bypass in mobile air conditioning system with R134a, International Journal of Refrigeration. 35(7), 1869 – 1877.
[9] Brutin, D., F. Topin, and L. Tadrist, 2003, Experimental study of unsteady convective boiling in heated minichannels, International Journal of Heat and Mass Transfer. 46(16), 2957 – 2965.
[10] Wu, H. Y., and P. Cheng, 2003, Visualization and measurements of periodic boiling in silicon microchannels, International Journal of Heat and Mass Transfer. 46(14), 2603 – 2614.
[11] Hetsroni, G. i dr., 2005. Explosive boiling of water in parallel micro – ‘channels, International Journal of Multiphase Flow. 31(4), 371 – 392.
[12] Kuo, C. J. and Y. Peles, 2008, Flow boiling instabilities in microchannels and means for mitigation by reentrant cavities, Journal of Heat Transfer. 130(7), 072402 – ‘10.
[13] Zhang, T. i dr., 2009, Ledinegg instability in microchannels, International Journal of Heat and Mass Transfer. 52(25 – 26), 5661 – 5674.
[14] Kandlikar, S. G., 2006, Nucleation characteristics and stability considerations during flow boiling in microchannels, Experimental Thermal and Fluid Science. 30(5), 441 – 447.
[15] Bergles, A. E. and S. G. Kandlikar, 2005, On the nature of critical heat flux in microchannels, Journal of Heat Transfer. 127(1), 101 – 107.
[16] Balasubramanian, P. and S. G. Kandlikar, 2005, Experimental study of flow patterns, pressure drop, and flow instabilities in parallel rectangular minichannels, Heat Transfer Engineering. 26(3), 20 – 27.
[17] Qu, W. and I. Mudawar, 2004, Transport phenomena in two – ‘phase microchannel heat sinks, Journal of Electronic Packaging. 126(2), 213 – 224.
[18] Bowers, C. D. i dr., 2012. Refrigerant distribution effects on the performance of microchannel evaporators, International Refrigeration and Air Conditioning Conference at Purdue. No. 2173.
[19] Tuo, H. F., A. Bielskus, and P. Hrnjak, 2012b, Experimentally validated model of refrigerant distribution in a parallel microchannel evaporator, SAE International Journal of Materials and Manufacturing. 5(2), 365 – 374.
[20] Bowers, C. D., S. S. Wujek, and P. Hrnjak, 2010, Quantification of refrigerant distribution and effectiveness in microchannel heat exchangers using infrared thermography, International Refrigeration and Air Conditioning Conference at Purdue. No. 2117.
[2] Bowers, C. D., T. A., Newell, P. S. Hrnjak, 2006, Experimental investigation of two – ‘phase refrigerant distribution in a microchannel manifold, Technical Report TR – ‘245, Air Conditioning and Refrigeration Center, University of Illinois, Urbana – ‘Champaign, IL.
[3] Hwang, Y., D. H., Jin, R., Radermacher, 2007, Refrigerant distribution in minichannel evaporator manifolds, HVAC&R Research, 13(4), 543 – 555.
[4] Zou, Y., 2010, Performance measurement and visualization on the refrigerant distribution in the vertical manifold of the microchannel tube heat exchanger, (Master – ™s Thesis). University of Illinois, Urbana – ‘Champaign, IL.
[5] Jiang, J., X. Lu, and L. Huang, 2010, Refrigerant distributor for heat exchanger, U.S. Patent No 20100242535 A1.
[6] Fei, P., D. Cantrak, P. S. Hrnjak, 2002, Refrigerant distribution in the inlet header of plate evaporators, 2002 SAE World Congress. Paper # 2002 – ‘01 – ‘0948.
[7] Beaver, A. C., J. M., Yin, C. W. Bullard, P. S. Hrnjak, 1999, An experimental investigation of transcritical carbon dioxide systems for residential air conditioning, Contract Report CR – ‘18, Air Conditioning and Refrigeration Center, University of Illinois, Urbana – ‘Champaign, IL.
[8] Tuo, H. F., P. S. Hrnjak, 2012a. Flash – ‘gas bypass in mobile air conditioning system with R134a, International Journal of Refrigeration. 35(7), 1869 – 1877.
[9] Brutin, D., F. Topin, and L. Tadrist, 2003, Experimental study of unsteady convective boiling in heated minichannels, International Journal of Heat and Mass Transfer. 46(16), 2957 – 2965.
[10] Wu, H. Y., and P. Cheng, 2003, Visualization and measurements of periodic boiling in silicon microchannels, International Journal of Heat and Mass Transfer. 46(14), 2603 – 2614.
[11] Hetsroni, G. i dr., 2005. Explosive boiling of water in parallel micro – ‘channels, International Journal of Multiphase Flow. 31(4), 371 – 392.
[12] Kuo, C. J. and Y. Peles, 2008, Flow boiling instabilities in microchannels and means for mitigation by reentrant cavities, Journal of Heat Transfer. 130(7), 072402 – ‘10.
[13] Zhang, T. i dr., 2009, Ledinegg instability in microchannels, International Journal of Heat and Mass Transfer. 52(25 – 26), 5661 – 5674.
[14] Kandlikar, S. G., 2006, Nucleation characteristics and stability considerations during flow boiling in microchannels, Experimental Thermal and Fluid Science. 30(5), 441 – 447.
[15] Bergles, A. E. and S. G. Kandlikar, 2005, On the nature of critical heat flux in microchannels, Journal of Heat Transfer. 127(1), 101 – 107.
[16] Balasubramanian, P. and S. G. Kandlikar, 2005, Experimental study of flow patterns, pressure drop, and flow instabilities in parallel rectangular minichannels, Heat Transfer Engineering. 26(3), 20 – 27.
[17] Qu, W. and I. Mudawar, 2004, Transport phenomena in two – ‘phase microchannel heat sinks, Journal of Electronic Packaging. 126(2), 213 – 224.
[18] Bowers, C. D. i dr., 2012. Refrigerant distribution effects on the performance of microchannel evaporators, International Refrigeration and Air Conditioning Conference at Purdue. No. 2173.
[19] Tuo, H. F., A. Bielskus, and P. Hrnjak, 2012b, Experimentally validated model of refrigerant distribution in a parallel microchannel evaporator, SAE International Journal of Materials and Manufacturing. 5(2), 365 – 374.
[20] Bowers, C. D., S. S. Wujek, and P. Hrnjak, 2010, Quantification of refrigerant distribution and effectiveness in microchannel heat exchangers using infrared thermography, International Refrigeration and Air Conditioning Conference at Purdue. No. 2117.