Effect of oil on R134a distribution in the microchannel heat exchanger with vertical header
Identifieur interne : 000130 ( Main/Exploration ); précédent : 000129; suivant : 000131Effect of oil on R134a distribution in the microchannel heat exchanger with vertical header
Auteurs : YANG ZOU [États-Unis] ; Pega S. Hrnjak [États-Unis]Source :
- International journal of refrigeration [ 0140-7007 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Installation frigorifique.
English descriptors
Abstract
This paper presents refrigerant R134a and oil (PAG 46) mixture upward flow in the vertical header of microchannel heat exchanger (compared to pure R134a and R410A), and its effect on distribution. The mixture enters into the header through the five tubes in the bottom pass and exits through the five tubes in the top pass representing the flow in the heat pump mode of outdoor heat exchangers in reversible systems. The quality was varied from 0.2 to 0.8 and the mass flow rate from 1.5 to 4.5 kg h-1 per tube. The oil circulation rate (OCR) was varied from 0% to 4.7%. It was found that at low OCR, e.g. 0.5%, the distribution was worse than pure R134a, whereas at high OCR, the distribution was improved and better than pure R134a in some cases. This was due to sufficient oil would create a lot of foams and enlarge the liquid region in the header based on the visualization.
Affiliations:
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Le document en format XML
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Hrnjak</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Air Conditioning and Refrigeration Center, Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street</s1><s2>Urbana, IL 61801</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Illinois</region></placeName></affiliation><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Creative Thermal Solutions, Inc., 2209 North Willow Road</s1><s2>Urbana, IL 61802</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Illinois</region></placeName></affiliation></author></analytic><series><title level="j" type="main">International journal of refrigeration</title><title level="j" type="abbreviated">Int. j. refrig.</title><idno type="ISSN">0140-7007</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">International journal of refrigeration</title><title level="j" type="abbreviated">Int. j. refrig.</title><idno type="ISSN">0140-7007</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Coolant</term><term>Distribution</term><term>Heat exchanger</term><term>Refrigeration installation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Distribution</term><term>Echangeur chaleur</term><term>Fluide refroidissement</term><term>Installation frigorifique</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Installation frigorifique</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This paper presents refrigerant R134a and oil (PAG 46) mixture upward flow in the vertical header of microchannel heat exchanger (compared to pure R134a and R410A), and its effect on distribution. The mixture enters into the header through the five tubes in the bottom pass and exits through the five tubes in the top pass representing the flow in the heat pump mode of outdoor heat exchangers in reversible systems. The quality was varied from 0.2 to 0.8 and the mass flow rate from 1.5 to 4.5 kg h<sup>-1</sup> per tube. The oil circulation rate (OCR) was varied from 0% to 4.7%. It was found that at low OCR, e.g. 0.5%, the distribution was worse than pure R134a, whereas at high OCR, the distribution was improved and better than pure R134a in some cases. This was due to sufficient oil would create a lot of foams and enlarge the liquid region in the header based on the visualization.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Illinois</li></region></list><tree><country name="États-Unis"><region name="Illinois"><name sortKey="Yang Zou" sort="Yang Zou" uniqKey="Yang Zou" last="Yang Zou">YANG ZOU</name></region><name sortKey="Hrnjak, Pega S" sort="Hrnjak, Pega S" uniqKey="Hrnjak P" first="Pega S." last="Hrnjak">Pega S. Hrnjak</name><name sortKey="Hrnjak, Pega S" sort="Hrnjak, Pega S" uniqKey="Hrnjak P" first="Pega S." last="Hrnjak">Pega S. Hrnjak</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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