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The Solubility of Propane (R290) with Commonly Used Compressor Lubrication Oils
KTH, Superseded Departments, Energy Technology.
KTH, Superseded Departments, Energy Technology.
KTH, Superseded Departments, Energy Technology.ORCID iD: 0000-0002-9902-2087
KTH, Superseded Departments, Energy Technology.
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2003 (English)In: Compressors and Their Systems, 2003, Vol. 4, 157-166 p.Conference paper, Published paper (Refereed)
Abstract [en]

An ongoing project called "Charge minimisation of a small capacity heat pump" is aimed to minimise the refrigerant charge in heat pumps, refrigeration and air-conditioning systems. The experimental heat pump was run with propane as refrigerant and the designed heat capacity (condenser capacity) was over 5kW. Tests were done to investigate the refrigerant charge distribution in different sections of the heat pump, while it was running. The experiments done so far have shown that the amount of refrigerant in the compressor is higher than expected.

This paper presents the measured refrigerant masses in a hermetic scroll compressor together in suction line and the calculated refrigerant mass dissolved in the compressor lubrication oil at different evaporation temperatures. Finally, solubility tests of propane with different lubricating oils are presented. The tests show that the propane is more soluble in POE than PAG oils.

Place, publisher, year, edition, pages
2003. Vol. 4, 157-166 p.
Series
IMECHE Conference Transactions, ISSN 1356-1448
Keyword [en]
Thermodynamics; Engineering, Environmental; Engineering, Mechanical
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6762ISI: 000186286000015ISBN: 1-86058-417-9 (print)OAI: oai:DiVA.org:kth-6762DiVA: diva2:11564
Conference
International Conference on Compressors and Their Systems CASS BUSINESS SCH, CITY UNIV, LONDON, ENGLAND, SEP 07-10, 2003
Note
QC 20100707Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2010-07-14Bibliographically 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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