Description of the Experimental Method and Procedure of Model Wear Test of Refrigeration Compressors’ Parts

Górny, Kasper; Tyczewski, Przemysław; Zwierzycki, Wiesław

doi:10.4028/www.scientific.net/ssp.225.85

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…The pair applied in the high-pressure chamber enables performing tribological tests in the mixtures of various oils and refrigerants in different temperatures and pressures. Producing the mixture oil -refrigerant in the chamber lets performing the tests on refrigerating compressors in their real operation conditions [4,14].…”

Section: Testing Methodsmentioning

confidence: 99%

The Influence of Liquid Refrigerant on Refrigerating Compressors Sliding Surfaces

Tyczewski

Chmiel

2016

SSP

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Reasons of compressors failures are connected with different operating conditions of individual parts. One of compressor damage reasons is pouring it over with liquid refrigerant. The purpose of this work was to carry out tests concerning the influence of refrigerant being in the liquid phase on piston compressor sliding surfaces. Tests were carried out in the mixture of synthetic polyester oil with liquid refrigerant R134a. The tests were performed with the use of the friction machine and the pair type block-on-ring simulating the refrigerating compressor inside and with the use of the real refrigerating compressor. The obtained results confirm the unfavourable influence of liquid refrigerant on friction elements in the refrigerating compressor. The role of hydrodynamic phenomena in the development of damage to the compressors has been showed.

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Section: Testing Methodsmentioning

confidence: 99%

The Influence of Liquid Refrigerant on Refrigerating Compressors Sliding Surfaces

Tyczewski

Chmiel

2016

SSP

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“…In broad terms, the papers [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ] attempted to evaluate various lubricants under the circumstances where oil was diluted with refrigerant, and the quantity of lubricant was sufficient. Some papers present research ideas and the results of wear tests to allow evaluation of the lubricating properties evaluation oil/refrigerant mixtures [ 28 , 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Mixtures of Lubricants and Ecological Refrigerants under Starved Lubrication Conditions

et al. 2022

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The presented results show that the presence of refrigerant significantly deteriorates the lubricating properties of compressor oil under starved lubrication conditions (with a small amount of oil). The change can be 40–120% compared to the properties of the oil alone. Additionally, in the group of oils that are substitutes (operational alternatives) compatible with a given refrigerant, the effect of the refrigerant on the lubricating properties varies. The differences can be as much as 25%. In order to evaluate and properly select compressor oils for the refrigerant, the lubricating properties should be tested in a mixture with the refrigerant under conditions similar to actual operation. Such an evaluation of lubricating properties is made possible by the author’s method of testing the wear of the block-on-ring friction node. The obtained rankings of lubricating properties for oils (due to the wear volume) can provide good guidelines for the suitable selection of a lubricant for refrigeration compressors (especially for new, environmentally friendly refrigerants, such as R452A). The research was carried out for mixtures of zeotropic refrigerants (R404A, R452A) with polyester oils (POE) and natural refrigerant (R600a) with mineral oils (MO). In each group of refrigerants, different mechanisms of oil–refrigerant mixture formation occur. Each refrigerant was tested with three different compressor oils recommended for each other for alternative uses in refrigeration systems.

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Effect of Applying Flushing Fluid on Lubricity Properties of Refrigerant Compressor Oils

et al. 2018

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There has currently been a dynamic return to applying natural refrigerants such as hydrocarbons. They are substances containing neither fluorine nor chlorine, which contribute to the enlargement of the ozone hole and the greenhouse effect. However, hydrocarbons are the substances from the A3 safety group (flammable) and, at present, are mainly used in appliances of low efficiency. The most widely used refrigerant in this category of appliances is R600a (isobutene). While repairing refrigeration appliances, there is often the need to remove the refrigerant and compressor oil from the system. Any impurities in the system are also removed. Should incorrect removal of the used oil from the installation occur, there is the risk that a certain amount of the oil and flushing fluid shall remain in the refrigeration system. The article presents an evaluation of the effect of a flushing fluid for refrigeration systems on lubricity properties of compressor oils. The article also describes the research on the use of R600a, a mineral oil of VG ISO 32 and commercially available FF1 flushing fluid, for refrigeration systems. The evaluation was made on the basis of the sample wear volume in the block-on-ring node under the conditions similar to compressor exploitation following a longer shut-off period. Three different lubricants were compared: a mixture of mineral oil with FF1 flushing fluid for refrigeration systems in the amount 20% by volume, a mixture of mineral oil with FF1 flushing fluid for refrigeration systems in the amount 50% by volume, and a mixture of mineral oil with FF1 flushing fluid for refrigeration systems in the amount 50% by volume with R600a.

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Description of the Experimental Method and Procedure of Model Wear Test of Refrigeration Compressors’ Parts

Cited by 8 publications

References 2 publications

The Influence of Liquid Refrigerant on Refrigerating Compressors Sliding Surfaces

The Influence of Liquid Refrigerant on Refrigerating Compressors Sliding Surfaces

Mixtures of Lubricants and Ecological Refrigerants under Starved Lubrication Conditions

Effect of Applying Flushing Fluid on Lubricity Properties of Refrigerant Compressor Oils

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