2002 Fiscal Year Final Research Report Summary
Boiling and Condensation Heat Transfer for New Refrigerants Flowing in Horizontal Tubes
| Project/Area Number |
13650230
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
OHISHI Katsumi Kyushu University, Faculty of Eng., Research Assistant, 大学院・工学研究院, 助手 (00037970)
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| Co-Investigator(Kenkyū-buntansha) |
MORI Hideo Kyushu University, Faculty of Eng., Associate Professor, 大学院・工学研究院, 助教授 (70150505)
YOSHIDA Suguru Kyushu University, Faculty of Eng., Professor, 大学院・工学研究院, 教授 (30037741)
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| Project Period (FY) |
2001 – 2002
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| Keywords | New Refrigerant HFE245mc / New Refrigerant HFE143m / Boiling / Condensation / Horizontal Tube / Grooved Tube |
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| Research Abstract |
Hydrofuluoroethers (HFEs) have recently been proposed as substitutes to conventional refrigerants including HFCs, since HFEs have Zero ozone depletion potential and also smaller global warning potential. HFE245mc and HFE143m are such substitutes to replace CFC114 especially for heat recovery heat pump systems and HFC134a for refrigerating systems respectively. In the present study, experiments were made on boiling and condensation heat transfer for HFE245mc and HFE143m flowing inside horizontal tubes.
1. For each new refrigerant, there was found no peculiar difference from conventional refrigerants in the characteristics of boiling heat transfer, as results of comparisons of measured local boiling heat transfer coefficients with the authors' correlation applicable to conventional refrigerants.
2. Also in condensation, the heat transfer coefficients for each new refrigerant can be satisfactorily predicted by the Hraguchi et al's correlation for conventional refrigerants.
3. Comparing the values calculated from the correlations, the heat transfer coefficient for HFE245mc showed to be higher than or equal to that of CFC114 for boiling and condensation.
4. Similarly, the heat transfer coefficient for HFE143m showed to be almost equal to that of HFC134a for boiling and condensation.
5. From the standpoint of heat transfer, therefore, there was no problem in the use of HFE 245mc and HFE143m as the alternative refrigerants to CFC114 and HFC134a, respectively.
6. In order to study the enhancement of the heat transfer coefficients, now, experiments are being on boiling and condensation for HFE245mc and HFE143m flowing inside spirally grooved tubes.
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Research Products
(10 results)
