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COP Prediction of an ejector refrigeration cycle combined with a vapour compression cycle for automotive air conditioning |
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| รหัสดีโอไอ | |
| Creator | 1. Nat Suvarnakuta 2. Nutthanun Keerlatiyadatanapat 3. Thanarath Sriveerakul |
| Title | COP Prediction of an ejector refrigeration cycle combined with a vapour compression cycle for automotive air conditioning |
| Publisher | Faculty of Engineering, Khon Kaen Univeristy |
| Publication Year | 2557 |
| Journal Title | KKU Engineering Journal |
| Journal Vol. | 41 |
| Journal No. | 1 |
| Page no. | 39-51 |
| Keyword | Ejector, Combined ejector-vapour refrigeration system, Automotive air conditioning |
| ISSN | 0125-8273 |
| Abstract | This paper presents the COP prediction of an ejector refrigeration cycle combined with a vapour compression cycle for automotive air conditioning. Using computational fluid dynamics (CFD) technique, the performance of an ejector was analyzed in term of the entrainment ratio (Rm) and critical back pressure (CBP). The results from this study were compared with a previous study of combined ejector refrigeration system for automotive air conditioning application [1] which the entrainment ratio (Rm) were predicted from one-dimensional (1-D) equation. The performance of an ejector (Rm and CBP) from CFD and one-dimensional method were analyzed and used as database for a mathematical modeling. In order to predict the COP of the combined system, a set of mathematical equations was developed using EES. The operating conditions are chosen accordingly as, intercooler temperature between 15 ๐C and 25 ๐C, condenser temperature equal to 35 ๐C and evaporator temperature equal to 5 ๐C. However, when generator temperatures are 80 ๐C, 85 ๐C and 90 ๐C, the results showed average relative errors of the COP of an ejector refrigeration cycle (COPej), between CFD and 1-D are 44.64%, 50.47% and 59.68% respectively, and between CFD and 1-D NEW are 1.54%, 0.08% and 6.49% respectively. |
