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R1234ze(E) specialized refrigeration lubricant in HFO blend application.

Number: 2433

Author(s) : CHEN Y. K., WANG Y. H., HUNG J-T.

Summary

HFOs with low GWP characteristics can be directly use or blend with other refrigerants like HFCs to expand application to meet new regulations in HVAC system. The representative HFOs are R1234ze(E) and R1234yf, which are structural isomers and are regarded as R134a alternative refrigerants. However, the two refrigerants have much different properties in application. Comparing to R1234yf, R1234ze(E) possesses much better affinity to incumbent refrigeration lubricants than that in R134a system. The strong affinity of R1234ze(E) would result in the lower miscibility temperature in evaporator, higher solubility and lower working viscosity in compressor under the same working condition as in R1234yf systems. To overcome these disadvantages from high affinity, one method is to use higher viscosity refrigeration lubricants to protect the compressor, but it will lead to more operation drag force, and subsequently lower compressor efficiency. The other method is using specialized refrigeration lubricant of R1234ze(E) to meet the higher working viscosity requirement. However specialized refrigeration lubricants of R1234ze(E) are typically immiscible with R134a and R1234yf, which will limit its scope of use.
In this paper, we design the new structure of specialized R1234ze(E) refrigeration lubricants and compare the solubility and working viscosity with current refrigeration lubricants for R134a in the same compressor working condition. To extend application scope, we also conducted experiments with some HFO blend refrigerants such as R513A and R515B. With this research study, we hope to find the appropriate base lubricants with a balanced miscibility, solubility, and lubricity, which work for R134a alternative HFO blend application.

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  • Original title: R1234ze(E) specialized refrigeration lubricant in HFO blend application.
  • Record ID : 30030726
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2022 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2022

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