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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Mitra, Biswajit Garimella, Srinivas |
| Copyright Year | 2003 |
| Abstract | This paper presents the results of an experimental study on heat transfer and pressure drop at critical and supercritical pressures of refrigerant R410A inside a horizontal 9.4 mm I.D. tube. Knowledge of heat transfer and pressure drop in such refrigerants blends at elevated pressures is gaining increasing attention for the design of vapor-compression space-conditioning and water heating systems at high heat rejection temperatures. Local heat transfer coefficients and pressure drops were measured for the mass flux range 200 < G < 800 kg/m2-s for the temperature range from 30–110°C. A technique that simultaneously allows accurate measurement of low local heat duties and deduction of the tube-side heat transfer coefficient from the measured overall resistance was used. A primary cooling loop using water at high flow rates ensures that the refrigerant side presents the governing thermal resistance. Heat exchange with a secondary cooling water stream at a much lower flow rate amplifies the coolant temperature difference, which in turn enables accurate heat duty measurements. The results show that the heat transfer coefficient exhibits a sharp peak in the vicinity of the vapor-liquid dome. These data are compared with the most relevant correlations from the literature and possible explanations for agreement and discrepancies between the data and predictions are provided. |
| Sponsorship | Heat Transfer Division |
| Starting Page | 361 |
| Ending Page | 368 |
| Page Count | 8 |
| File Format | |
| ISBN | 0791836932 |
| DOI | 10.1115/HT2003-47273 |
| e-ISBN | 0791836797 |
| Volume Number | Heat Transfer: Volume 1 |
| Conference Proceedings | ASME 2003 Heat Transfer Summer Conference |
| Language | English |
| Publisher Date | 2003-07-21 |
| Publisher Place | Las Vegas, Nevada, USA |
| Access Restriction | Subscribed |
| Subject Keyword | Water Temperature Compression Cooling Vapors Flow (dynamics) Design Heat Domes (structural elements) Thermal resistance Pressure drop Coolants Heat transfer coefficients Hot water heating Heat transfer Refrigerants |
| Content Type | Text |
| Resource Type | Article |
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