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ASHRAE IJHVAC 9-1
HVAC&R Research - Volume 9, Number 1, January 2003
Year: 2003
Abstract: INTRODUCTION
The present study is one portion of ASHRAE Research Project RP-984, "The Effect of Inundation and Immiscible Oil on Condensation Heat Transfer of R-134a," which investigates shell-side condensation of HFC-134a on both single tubes and tube bundles. This part of the study focused on determining the effects of heat flux, saturation temperature, and tube geometry on shell-side condensation heat transfer coefficients of HFC-134a on a single tube, and performing the Wilson plot on each tube type selected for the project.
Shell-side condensation heat transfer coefficients for R-134a were obtained in a 76.2 mm (3 in.) outer diameter (OD) test section. The test tubes, which were horizontally mounted inside the test section, had a 19.1 mm (0.75 in.) nominal OD and were 1067 mm (42 in.) long. Three tubes were tested during this study: a tube with a two-dimensional (2D) fin structure, a tube with a three-dimensional (3D) fin structure, and a smooth tube. The data were obtained at refrigerant saturation temperatures of 40 and 45°C (104 and 113°F) over a nominal heat flux range of 3155 to 63 100 W/m2 (1000 to 20,000 Btu/h· ft2).
The final phase of this study was to compare test results for each tube type and to evaluate the effect of outer surface enhancement on shell-side condensation heat transfer performance. In addition, the experimentally determined heat transfer coefficients were compared with the corresponding models for each test tube.
The present study is one portion of ASHRAE Research Project RP-984, "The Effect of Inundation and Immiscible Oil on Condensation Heat Transfer of R-134a," which investigates shell-side condensation of HFC-134a on both single tubes and tube bundles. This part of the study focused on determining the effects of heat flux, saturation temperature, and tube geometry on shell-side condensation heat transfer coefficients of HFC-134a on a single tube, and performing the Wilson plot on each tube type selected for the project.
Shell-side condensation heat transfer coefficients for R-134a were obtained in a 76.2 mm (3 in.) outer diameter (OD) test section. The test tubes, which were horizontally mounted inside the test section, had a 19.1 mm (0.75 in.) nominal OD and were 1067 mm (42 in.) long. Three tubes were tested during this study: a tube with a two-dimensional (2D) fin structure, a tube with a three-dimensional (3D) fin structure, and a smooth tube. The data were obtained at refrigerant saturation temperatures of 40 and 45°C (104 and 113°F) over a nominal heat flux range of 3155 to 63 100 W/m2 (1000 to 20,000 Btu/h· ft2).
The final phase of this study was to compare test results for each tube type and to evaluate the effect of outer surface enhancement on shell-side condensation heat transfer performance. In addition, the experimentally determined heat transfer coefficients were compared with the corresponding models for each test tube.
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ASHRAE IJHVAC 9-1
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| contributor author | ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. | |
| date accessioned | 2017-09-04T18:05:56Z | |
| date available | 2017-09-04T18:05:56Z | |
| date copyright | 01/01/2003 | |
| date issued | 2003 | |
| identifier other | GKZEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/188892 | |
| description abstract | INTRODUCTION The present study is one portion of ASHRAE Research Project RP-984, "The Effect of Inundation and Immiscible Oil on Condensation Heat Transfer of R-134a," which investigates shell-side condensation of HFC-134a on both single tubes and tube bundles. This part of the study focused on determining the effects of heat flux, saturation temperature, and tube geometry on shell-side condensation heat transfer coefficients of HFC-134a on a single tube, and performing the Wilson plot on each tube type selected for the project. Shell-side condensation heat transfer coefficients for R-134a were obtained in a 76.2 mm (3 in.) outer diameter (OD) test section. The test tubes, which were horizontally mounted inside the test section, had a 19.1 mm (0.75 in.) nominal OD and were 1067 mm (42 in.) long. Three tubes were tested during this study: a tube with a two-dimensional (2D) fin structure, a tube with a three-dimensional (3D) fin structure, and a smooth tube. The data were obtained at refrigerant saturation temperatures of 40 and 45°C (104 and 113°F) over a nominal heat flux range of 3155 to 63 100 W/m2 (1000 to 20,000 Btu/h· ft2). The final phase of this study was to compare test results for each tube type and to evaluate the effect of outer surface enhancement on shell-side condensation heat transfer performance. In addition, the experimentally determined heat transfer coefficients were compared with the corresponding models for each test tube. | |
| language | English | |
| title | ASHRAE IJHVAC 9-1 | num |
| title | HVAC&R Research - Volume 9, Number 1, January 2003 | en |
| type | standard | |
| page | 106 | |
| status | Active | |
| tree | ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.:;2003 | |
| contenttype | fulltext |