Performance analysis of thermosyphon heat exchanger under electric field

Wangnipparnto, Santi; Tiansuwan, J.; Kiatsiriroat, Tanongkiat; Wang, Chi-Chuan

doi:10.1016/s0196-8904(02)00104-8

Cited by 26 publications

(19 citation statements)

References 3 publications

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“…It was also found that the accuracy of prediction methods increased with increasing the inlet velocity. In other studies, different working fluids [40] and different filling ratios [41] have been experimentally studied in similar heat exchangers as well as different sets of variables, such as electrohydrodynamics (EHD) [42]. In addition, similar investigations for such systems were also reported for solar collectors' applications [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Danielewicz

Sayegh

Śniechowska

et al. 2014

Energy

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In recent years, the use of wickless heat pipes (thermosyphons) in heat exchangers has been on the rise, particularly in gas to gas heat recovery applications due to their reliability and the level of contingency they offer compared to conventional heat exchangers. Recent technological advances in the manufacturing processes and production of gravity assisted heat pipes (thermosyphons) have resulted in significant improvements in both quality and cost of industrial heat pipe heat exchangers. This in turn has broadened the potential for their usage in industrial waste heat recovery applications. In this paper, a tool to predict the performance of an air to air thermosyphon based heat exchanger using the ε-NTU method is explored. This tool allows the predetermination of variables such as the overall heat transfer coefficient, effectiveness, pressure drop and heat exchanger duty according to the flow characteristics and the thermosyphons configuration within the heat exchanger. The new tool's predictions were validated experimentally and a good correlation between the theoretical predictions and the experimental data, was observed.

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Section: Introductionmentioning

confidence: 99%

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Danielewicz

Sayegh

Śniechowska

et al. 2014

Energy

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“…They established a correlation for predicting the heat transfer at medium temperatures. Wangnipparnto et al [5] studied the performance of a thermosyphon heat exchanger at normal temperature under an electric field, using water and R-134a as working fluids, having a 6 x 7 inline arrangement. At present, the thermosyphon air-preheater has become important equipment for energy recovery from industrial waste heat because of its low investment cost and high thermal conductivity.…”

Section: Targetsmentioning

confidence: 99%

Application of thermosyphon air-preheater for energy thrift from a furnace in a hot forging process

2011

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This research studied the heat transfer of the thermosyphon air-preheater. An empirical model was developed to predict heat transfer and applied to compute the thermosyphon air-preheater in a hot brass forging process. The thermosyphon air-preheater was designed, constructed and tested under medium temperature operating conditions with inlet hot gases, ranging between 390-440 °C in terms of using water as the working fluid with a 50 % fill by volume of the evaporator section. The experimental setup was comprised of a circular fin with 0.013 and 0.020 m internal diameter bare stainless steel tubes, with 0.015 m long evaporator and condenser sections. The thermosyphon air-preheater model had 6 rows, each composed of 4 columns. Experimental results found that the hot gas temperature was increased from 390 to 440 °C, the heat transfer rate increased. If the internal diameter changed from 0.013 to 0.020 m, the heat transfer rate slightly increased. The predicted results agreed well with the experimental data. This thermosyphon air-preheater has been designed, manufactured and tested for heat recovery in industry using medium temperatures ranging between 300-500 °C to recover flue gas energy from the furnace in a hot brass forging process.

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“…The mathematical model of this study is analogous to that of Wangnipparnto et al (2003). Note that Wangnipparnto et al (2003) program is valid for the simulation at normal temperature condition (90-150°C).…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…Note that Wangnipparnto et al (2003) program is valid for the simulation at normal temperature condition (90-150°C). While the present simulation program develops for predicting at medium temperature condition (370-420°C) and applies to compute the heat pipe air-preheater in a hot brass forging process.…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…Nuntaphan and Kiatsiriroat, (2004) modified radiators to be heat pipe and they used as waste heat recovery devices. Wangnipparnto et al (2003) studied the performance of a thermosyphon heat exchanger at normal temperature under an electric field, using water and R134a as working fluids, having a 6×7 inline arrangement. Wu et al (1997) studied the application of heat pipe exchangers for humidity control in an air conditioning system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Waste Heat Recovery by Heat Pipe Air-Preheater to Energy Thrift from the Furnace in a Hot Forging Process

Yodrak¹,

Rittidech²,

Poomsa-ad³

et al. 2010

American Journal of Applied Sciences

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Problem statement: Currently, the heat pipe air-preheater has become importance equipment for energy recovery from industrial waste heat because of its low investment cost and high thermal conductivity. Approach: This purpose of the study was to design, construct and test the waste heat recovery by heat pipe air-preheater from the furnace in a hot brass forging process. The mathematical model was developed to predict heat transfer rate and applied to compute the heat pipe air-preheater in a hot brass forging process. The heat pipe air-preheater was designed, constructed and tested under medium temperature operating conditions with inlet hot gas ranging between 370-420°C using water as the working fluid with 50% filling by volume of evaporator length. Results: The experiment findings indicated that when the hot gas temperature increased, the heat transfer rate also increased. If the internal diameter increased, the heat transfer rate increased and when the tube arrangement changed from inline to staggered arrangement, the heat transfer rate increased. Conclusion/Recommendations: The heat pipe air-preheater can reduced the quantity of using gas in the furnace and achieve energy thrift effectively.

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Performance analysis of thermosyphon heat exchanger under electric field

Cited by 26 publications

References 3 publications

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Application of thermosyphon air-preheater for energy thrift from a furnace in a hot forging process

Waste Heat Recovery by Heat Pipe Air-Preheater to Energy Thrift from the Furnace in a Hot Forging Process

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