Abstract
The involvement of oil lubricants in vapour compression refrigeration (VCR) systems could adversely influence the flow, heat transfer and efficiency of refrigeration. A numerical model for a VCR system using linear compressor, R1234yf, and POE oil is developed in this study to investigate the effect of oil lubricant on the flow and heat transfer as well as the system performance including cooling capacity and coefficient of performance (COP). The proposed model is validated by measurements of a prototype oil-free VCR system with most of the simulated data falling within ±20% of measurements. The evaporator heat transfer coefficient, cooling capacity, and COP for the system from the proposed model show a positive correlation with oil circulation rate (OCR). The COPs and pressure losses for oil-free system are 15–28% higher and 36–60% lower than that of oil-lubricated system respectively.
| Original language | English |
|---|---|
| Article number | 106016 |
| Number of pages | 11 |
| Journal | International Communications in Heat and Mass Transfer |
| Volume | 134 |
| Early online date | 30 Mar 2022 |
| DOIs | |
| Publication status | Published - May 2022 |
Keywords
- COP
- Heat transfer coefficient
- Numerical model
- Oil effect
- Pressure drop
- R1234yf/POE mixture
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