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A minichannel aluminium tube heat exchanger - Part III: Condenser Performance with Propane
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
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2008 (English)In: International journal of refrigeration, ISSN 0140-7007, E-ISSN 1879-2081, Vol. 31, no 4, 696-708 p.Article in journal (Refereed) Published
Abstract [en]

This paper reports heat transfer results obtained during condensation of refrigerant propane inside a minichannel aluminium heat exchanger vertically mounted in an experimental setup simulating a water-to-water heat pump. The condenser was constructed of multiport minichannel aluminium tubes assembled as a shell-and-tube heat exchanger. Propane vapour entered the condenser tubes via the top end and exited sub-cooled from the bottom. Coolant water flowed upward on the shell-side. The heat transfer areas of the tube-side and the shell-side of the condenser were 0.941 m(2) and 0.985 m(2), respectively. The heat transfer rate between the two fluids was controlled by varying the evaporation temperature while the condensation temperature was fixed. The applied heat transfer rate was within 3900-9500 W for all tests. Experiments were performed at constant condensing temperatures of 30 degrees C, 40 degrees C and 50 degrees C, respectively. The cooling water flow rate was maintained at 11.90 l min(-1) for all tests. De-superheating length, two-phase length, sub-cooling length, local heat transfer coefficients and average heat transfer coefficients of the condenser were calculated. The experimental heat transfer coefficients were compared with predictions from correlations found in the literature. The experimental heat transfer coefficients in the different regions were higher than those predicted by the available correlations.

Place, publisher, year, edition, pages
2008. Vol. 31, no 4, 696-708 p.
Keyword [en]
heat exchanger, minichannel, condenser, aluminium, experiment, propane, performance, heat transfer
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6766DOI: 10.1016/j.ijrefrig.2008.02.013ISI: 000257361700014Scopus ID: 2-s2.0-44449146880OAI: oai:DiVA.org:kth-6766DiVA: diva2:11568
Note
QC 20100708. Uppdaterad från Submitted till Published 20100708.Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2012-03-20Bibliographically approved
In thesis
1. Experimental Investigation of Refrigerant Charge Minimisation of a Small Capacity Heat Pump
Open this publication in new window or tab >>Experimental Investigation of Refrigerant Charge Minimisation of a Small Capacity Heat Pump
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Enormous quantities of heat are available in air, soil, water, exhaust air from buildings, and in waste water of any kind. However these heat sources are use-less for heating purposes since their temperatures are lower than the tempera-ture required for heating. Heat pumps can be used to extract heat from these sources with a small expenditure of additional energy and up-grade and deliver the energy as useful heat for room heating.

The heat pump cycle employs the well-known vapour compression cycle. The amount of heat delivered by a heat pump is equal to the amount of energy extracted from the heat source plus the heat equivalent to the compression work of the heat pump. Heat pumps, of course, are being generally accepted as outstanding energy saving units due their coefficient of performance (COP). Heat pumps for house heating have been used extensively in many countries and are especially common in Sweden. The annual growth rate of heat pump usage in Sweden is the same as in rest of Europe. According to the Swedish heat pump association, between 1986 to August 2003, the number of installed heat pump units in Sweden was 332,309. The demand for heat pumps started to increase from the year 1995 and in the year 2002, approximately 40,000 heat pump units were installed. Among the many types available, single-family heat pumps providing heating capacity of about 5 kW are widely popular.

The main drawbacks of heat pumps are the complexity of the systems, high cost, need of technical knowledge, safety hazards and environmental effects of certain refrigerants, etc. An efficient heat pump with small refrigerant charge would have less of some of these drawbacks and could be a competitive alterna-tive to other heating processes.

In this study, methods of refrigerant charge minimisation without reducing the performance of a small capacity (5 kW) heat pump have been investigated. Work has been focused on finding refrigerant charge distribution in different components of the heat pump, on finding out the solubility of refrigerant (pro-pane) with different compressor lubrications oils, on testing different types of compact heat exchangers, on constructing new minichannel heat exchangers and on finding correlations for calculating the heat transfer of minichannel heat exchangers. The results included in this thesis have been presented in four con-ference papers and five journal papers of which two were published and three were submitted for publication.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xxii, 84 p.
Series
Trita-REFR, ISSN 1102-0245 ; 07/58
Keyword
heat pump, propane, low-charge, Wilson plot method, minichannels, aluminium heat exhangers, single.phase flow
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-4273 (URN)978-91-7178-569-5 (ISBN)
Public defence
2007-02-19, Salongen, KTHB, Osquars Backe 31, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100707Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-07-08Bibliographically approved

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