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Effect of lubricating oil on the refrigerant heat transfer performance during spray evaporation on tube bundles.

Number: 2195

Author(s) : EBANESAR J. R., CREMASCHI L.

Summary

This paper describes the effect of lubricating oil on the heat transfer performance of spray evaporators for air conditioning and refrigeration systems. The literature on low-GWP refrigerants and oil mixtures is limited for these types of heat exchangers. The present paper provides new heat transfer coefficient data for tube bundles that adopted enhanced outer tube surfaces. The experiments were carried out for refrigerant and lubricant mixtures of R134a (HFC) and R1234ze(E) (HFO) with synthetic polyester (POE) and polyether (PE) lubricants. The effects of heat flux, oil viscosity, oil circulation ratio (OCR), and saturation temperature were presented. The saturation temperature ranged from -9°C to 10°C (16°F to 50°F), and the heat flux varied between 3 kW/m2 and 20 kW/m2. The results indicated a slight decrease of the tube bundle heat transfer coefficient for OCRs of less than 1%. In some testing conditions, the small amount of lubricant in the spray enhanced the tube bundle heat transfer coefficient by as much as 10 percent. However, if the OCRs were higher than 1%, marked penalizations of the heat transfer coefficient were measured, particularly at low saturation evaporation temperature.

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Pages: 10 p.

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  • Original title: Effect of lubricating oil on the refrigerant heat transfer performance during spray evaporation on tube bundles.
  • Record ID : 30030605
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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