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Application of silver nanofluid containing oleic acid surfactant in a thermosyphon economizer.

Parametthanuwat T, Rittidech S, Pattiya A, Ding Y, Witharana S - Nanoscale Res Lett (2011)

Bottom Line: The volumetric flow rates for the coolant (in the condenser) were 1, 2.5, and 5 l/min.The operating temperatures were 60, 70, and 80°C.It was further found that the effectiveness of nanofluid and the OA containing nanofluids were superior in effectiveness over water in all experimental conditions came under this study.

View Article: PubMed Central - HTML - PubMed

Affiliation: Heat-Pipe and Thermal Tools Design Research Unit (HTDR), Division of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Thailand. s_rittidej@hotmail.com.

ABSTRACT
This article reports a recent study on the application of a two-phase closed thermosyphon (TPCT) in a thermosyphon for economizer (TPEC). The TPEC had three sections of equal size; the evaporator, the adiabatic section, and the condenser, of 250 mm × 250 mm × 250 mm (W × L × H). The TPCT was a steel tube of 12.7-mm ID. The filling ratios chosen to study were 30, 50, and 80% with respect to the evaporator length. The volumetric flow rates for the coolant (in the condenser) were 1, 2.5, and 5 l/min. Five working fluids investigated were: water, water-based silver nanofluid with silver concentration 0.5 w/v%, and the nanofluid (NF) mixed with 0.5, 1, and 1.5 w/v% of oleic acid (OA). The operating temperatures were 60, 70, and 80°C. Experimental data showed that the TPEC gave the highest heat flux of about 25 kW/m2 and the highest effectiveness of about 0.3 at a filling ratio of 50%, with the nanofluid containing 1 w/v% of OA. It was further found that the effectiveness of nanofluid and the OA containing nanofluids were superior in effectiveness over water in all experimental conditions came under this study. Moreover, the presence of OA had clearly contributed to raise the effectiveness of the nanofluid.

No MeSH data available.


Related in: MedlinePlus

Schematic diagram of experimental apparatus.
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Figure 3: Schematic diagram of experimental apparatus.

Mentions: Initially, the TPCT should be evacuated to about 0.010 mmHg. The time required to achieve this level depends on the pump capacity. Before filling the tube with the working fluid, the system was leak-checked with a vacuum gauge. This is done by closing valve V1, while leaving V2, V3, and V4 open. Then to fill the working fluid to the TPCT, open V1 and close V3. After the correct inventory of liquid was allowed into the TPCT, V1 was closed. Now valve V3 was opened and the vacuum pump was activated. While doing so the valve V4 was closed and the copper tube was dissected and a welding cap was placed on it. Now the TPCT was ready for experiment. Figure 3 shows the schematic diagram of the experimental apparatus which consists of a TPEC and peripheral devices. The evaporator section is the heat source with a hot bath. The condenser section is the heat sink with a cold bath. The heat was supplied by circulating water through the evaporator. The hot water flow rates were controlled to achieve ± 4°C temperature in the adiabatic section


Application of silver nanofluid containing oleic acid surfactant in a thermosyphon economizer.

Parametthanuwat T, Rittidech S, Pattiya A, Ding Y, Witharana S - Nanoscale Res Lett (2011)

Schematic diagram of experimental apparatus.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211402&req=5

Figure 3: Schematic diagram of experimental apparatus.
Mentions: Initially, the TPCT should be evacuated to about 0.010 mmHg. The time required to achieve this level depends on the pump capacity. Before filling the tube with the working fluid, the system was leak-checked with a vacuum gauge. This is done by closing valve V1, while leaving V2, V3, and V4 open. Then to fill the working fluid to the TPCT, open V1 and close V3. After the correct inventory of liquid was allowed into the TPCT, V1 was closed. Now valve V3 was opened and the vacuum pump was activated. While doing so the valve V4 was closed and the copper tube was dissected and a welding cap was placed on it. Now the TPCT was ready for experiment. Figure 3 shows the schematic diagram of the experimental apparatus which consists of a TPEC and peripheral devices. The evaporator section is the heat source with a hot bath. The condenser section is the heat sink with a cold bath. The heat was supplied by circulating water through the evaporator. The hot water flow rates were controlled to achieve ± 4°C temperature in the adiabatic section

Bottom Line: The volumetric flow rates for the coolant (in the condenser) were 1, 2.5, and 5 l/min.The operating temperatures were 60, 70, and 80°C.It was further found that the effectiveness of nanofluid and the OA containing nanofluids were superior in effectiveness over water in all experimental conditions came under this study.

View Article: PubMed Central - HTML - PubMed

Affiliation: Heat-Pipe and Thermal Tools Design Research Unit (HTDR), Division of Mechanical Engineering, Faculty of Engineering, Mahasarakham University, Thailand. s_rittidej@hotmail.com.

ABSTRACT
This article reports a recent study on the application of a two-phase closed thermosyphon (TPCT) in a thermosyphon for economizer (TPEC). The TPEC had three sections of equal size; the evaporator, the adiabatic section, and the condenser, of 250 mm × 250 mm × 250 mm (W × L × H). The TPCT was a steel tube of 12.7-mm ID. The filling ratios chosen to study were 30, 50, and 80% with respect to the evaporator length. The volumetric flow rates for the coolant (in the condenser) were 1, 2.5, and 5 l/min. Five working fluids investigated were: water, water-based silver nanofluid with silver concentration 0.5 w/v%, and the nanofluid (NF) mixed with 0.5, 1, and 1.5 w/v% of oleic acid (OA). The operating temperatures were 60, 70, and 80°C. Experimental data showed that the TPEC gave the highest heat flux of about 25 kW/m2 and the highest effectiveness of about 0.3 at a filling ratio of 50%, with the nanofluid containing 1 w/v% of OA. It was further found that the effectiveness of nanofluid and the OA containing nanofluids were superior in effectiveness over water in all experimental conditions came under this study. Moreover, the presence of OA had clearly contributed to raise the effectiveness of the nanofluid.

No MeSH data available.


Related in: MedlinePlus