Experimental Study of a Thermosyphon Heat Exchanger (TPHE) in a Bio-diesel Factory in Thailand

Pipatpaiboon, Namphon; Rittidech, S.; Meena, P.

doi:10.1007/s13369-012-0310-6

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…When k = 2 is correct, the combined standard uncertainty in normally distributed results in the level of confidence is approximately 95 (Bell, (2001); Pipatpaiboon (2012)). The results of the uncertainty analysis of this study are given in Table 3.…”

Section: Uncertainty Analysismentioning

confidence: 99%

Use of Silver Nanoparticles Mixed With Deionized Water in a Rectangular Two-Phase Closed Thermosyphon: A Case Study of the Two-Phase Flow

Sichamnan¹,

Pipatpaiboon²,

Chompookham³

et al. 2022

Front. Heat Mass Transf.

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When nanofluid (NF) is used as the working fluid in a rectangular two-phase closed thermosyphon (RTPCT), the formations and heat performance of two-phase flow patterns are explored qualitatively. Silver nanoparticles were mixed with deionized water at a concentration of 0.5 wt% in the NF. Nanoparticles improved the thermal contact surface area within the base flow, allowing the base fluid to boil quickly and easily. When the working fluid was boiled, NF also demonstrated high thermal conductivity capabilities, which diffused and moved along with the dual flow patterns. As a result, these qualities improved the RTPCT's efficiency. Considering the findings of the RTPCT test at evaporation temperatures of 50, 70, and 90 o C, three flow forms are observed: bubble flow (BF), slug flow (SF), and churn flow (CF), respectively. The slug flow (SF) and the churn flow (CF) are patterns that influence the heat flux. The greatest heat flow obtained from the test is 4.78 kW/m 2 at 90°C evaporation temperatures, whereas the heat flux measured at 70°C and 50°C evaporation temperatures is 2.95 kW/m 2 and 2.74 kW/m 2 , respectively.

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Section: Uncertainty Analysismentioning

confidence: 99%

Use of Silver Nanoparticles Mixed With Deionized Water in a Rectangular Two-Phase Closed Thermosyphon: A Case Study of the Two-Phase Flow

Sichamnan¹,

Pipatpaiboon²,

Chompookham³

et al. 2022

Front. Heat Mass Transf.

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“…When k = 2 is correct, if the combined standard uncertainty in normally distributed results in the level of confidence of approximately 95% [35,36].…”

Section: Uncertainty Analysismentioning

confidence: 99%

Archives of Thermodynamics

Chompookham,

Sichamnan,

Bhuwakietkumjohn

et al. 2020

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This research explored different types of two-phase flow patterns that influenced heat transfer rate by assessing rectangular two-phase closed thermosyphon (RTPCT) made from glass with the sides of equal length of 25.2 mm, aspect ratio 5 and 20, evaporation temperature of 50, 70, and 90 • C, working substance addition rate of 50% by volume of evaporator, and water inlet temperature at condensation of 20 • C. Upon testing with aspect ratios 5, three flow patterns emerged which were: bubble flow, slug flow and churn flow respectively. As per the aspect ratio 20, four flow patterns were discovered which were: bubble flow, slug flow, churn flow and annular flow, respectively. Aspect ratio 5 pertains characteristic which resulted in a shorter evaporation rate of the RTPCT than that of the aspect ratio 20, thus, a shorter flow distance from the evaporator section to heat releaser was observed. Therefore, flow patterns at aspect ratio 5 exhibited a faster flow velocity than that of the aspect ratio 20. Furthermore, changes of flow pattern to the one that is important for heat transfer rate can be easily achieved. Churn flow was the most important type of the flow for

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“…These temperatures were used to determine the heat transfer rate of the HOHP with (2). [11]. (i) Calculating standard uncertainty for a type A evaluation: when a set of several repeated readings were taken (for a type A estimate of uncertainty), (arithmetic mean) and SD (standard deviation) can be calculated as follows:…”

Section: The Hohp Apparatusmentioning

confidence: 99%

The Helical Oscillating Heat Pipe: Flow Pattern Behaviour Study

Sriudom

Rittidech

Chompookham

2014

Advances in Mechanical Engineering

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This research aims to study the effect of evaporator temperature, pitch distance, and working fluid on the internal flow pattern and the heat transfer characteristics of the helical oscillating heat pipe. A Pyrex tube with an inner diameter of 2.4 mm was used to study the flow pattern in the evaporator section. The pitch distance varied at 1, 1.5, and 2 cm. Water and R-123 were used as working fluid with a filling ratio of 80% by total volume. In the evaporator section, the water temperature varied at 60, 75, and 90 ∘ C to supply heat to the heat pipe. In the condenser section, air with a temperature of 25 ∘ C was used as heat sink. From the results, it was found that 4 internal flow patterns, bubble flow, slug flow, annular flow, and stratified wavy flow, were observed in the evaporator section for both working fluids. The heat transfer rate decreased when the pitch distance was increased from 1 to 2 cm. The maximum heat flux was 2,132.6 and 1,773.4 W/m 2 for the working fluid of R-123 and water, respectively. Both occurred at a pitch distance of 1 cm and an evaporator temperature of 90 ∘ C.

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Experimental Study of a Thermosyphon Heat Exchanger (TPHE) in a Bio-diesel Factory in Thailand

Cited by 13 publications

References 9 publications

Use of Silver Nanoparticles Mixed With Deionized Water in a Rectangular Two-Phase Closed Thermosyphon: A Case Study of the Two-Phase Flow

Use of Silver Nanoparticles Mixed With Deionized Water in a Rectangular Two-Phase Closed Thermosyphon: A Case Study of the Two-Phase Flow

Archives of Thermodynamics

The Helical Oscillating Heat Pipe: Flow Pattern Behaviour Study

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