Performance enhancement of a two-phase closed thermosiphon with a thin porous copper coating

Solomon, A. Brusly; Daniel, V. Arul; Ramachandran, K.; Pillai, B.C.; Singh, Ranjit; Sharifpur, Mohsen; Meyer, Josua P.

doi:10.1016/j.icheatmasstransfer.2017.02.001

Cited by 56 publications

(11 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The condenser performance was also modified using extensive fins on the heat transfer/cooling walls. Several studies have shown that both techniques enhance the THP [11,12,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Study of Heat Pipe Thermal Performance with Internal Modified Geometry

Temimy¹,

Abdulrasool

Hamad

2021

Fluids

View full text Add to dashboard Cite

The aim of this study was to investigate the effect of inserting a new internal tube packing (TP) on the thermal performance of a thermosyphon heat pipe (THP). The THP pipe was made from copper with an inner diameter of 17.4 mm and length of 600 mm. The new internal tube packing (TP) had a central copper disc with two copper tubes soldered onto both sides to transport vapor and condensate. The upper tube or riser had an inner diameter of 8.3 mm and was 300 mm long; it was connected to a hole in the disc from the upper side to transport the steam to the condenser section. The lower tube or downcomer had an inner diameter of 5 mm, was 225 mm long and was connected to the lower side of the disc to collect the condensate and transport it to the evaporator. The TP was inserted inside the THP to complete the design of the improved heat pipe (TPTHP). Experimental results showed that the TPTHP reduces the transit time from 16 to 11 min and the thermal resistance by 17–62% based on the input power and depending on the conditions of the THP. The results also showed that the inclination angle and filling ratio have no effect on the thermal resistance of the TPTHP.

show abstract

Section: Introductionmentioning

confidence: 99%

Study of Heat Pipe Thermal Performance with Internal Modified Geometry

Temimy¹,

Abdulrasool

Hamad

2021

Fluids

View full text Add to dashboard Cite

show abstract

“…The results of theoretical and experimental analyses showed that the acetone is better than water and ethanol in term of heat transfer. Solomon et al [27] focused on the closed system presenting the comparison between the two phase closed thermosyphon (TPCT), porous copper coating and the uncoated, the results showed that difference in heat transfer coefficients between the two cases at an angle of 45 • is 44% at a heat flux of 10 kW.m −2 . Furthermore, more the copper coating is thin more the wall temperature of the evaporator is significant and the heat transfer coefficient is increased, which makes the thin coating a suitable for cooling high-density power.…”

Section: Introductionmentioning

confidence: 99%

A New Project for a Much More Diverse Moroccan Strategic Version: The Generalization of Solar Water Heater

et al. 2020

View full text Add to dashboard Cite

This paper presents a strategical project for the new version of the Moroccan energy policy. It highlights the technology of solar water heaters (SWH), studying energy, economic and environmental gains of SWH generalization to satisfy the total resident need proposing a new strategic version diversified in terms of adopted technologies (more than green electricity). A detailed analysis of thermal performances and economic profitability of direct thermosyphon solar water heaters (TSWH) for residential requirements in Morocco. The optimum design parameters were defined and investigated using the dynamic TRNSYS simulation program. The optimum system was simulated under the six climatic conditions of Morocco in order to assess the related performances in terms of the collector efficiency and solar fraction. The major finding of this work is that large-scale integration of TSWH into Moroccan residences could provide up to 70% of thermal energy loads. An economic study was also developed to predict the life-cycle savings generated by the generalization of this technology in Morocco for all residential building’s categories. Approximately 1250 million USD as national saving on the total energy bill can be achieved. The environmental effects were also assessed to achieve the aims of this work and to evaluate the CO2 emissions avoided due to this environmentally friendly solution.

show abstract

“…Singh et al [14] investigated the effect of surface modification on the thermal performance in an evaporator and condenser for flat thermosyphons with and without an anodized surface. Solomon et al [15] studied the heat performance of thermosyphons with surface modifications at diverse inclination angles and input powers. The surface modifications significantly reduce the wall temperature of the evaporator and increase the heat-transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Start-Up Characteristics of Thermosyphons Modified with Different Hydrophilic and Hydrophobic Inner Surfaces

Zhao

Jiang

et al. 2020

Energies

View full text Add to dashboard Cite

In this paper, the influence of wettability properties on the start-up characteristics of two-phase closed thermosyphons (TPCTs) is investigated. Chemical coating and etching techniques are performed to prepare the surfaces with different wettabilities that is quantified in the form of the contact angle (CA). The 12 TPCTs are processed including the same CA and a different CA combination on the inner surfaces inside both the evaporator and the condenser sections. For TPCTs with the same wettability properties, the introduction of hydrophilic properties inside the evaporator section not only significantly reduces the start-up time but also decreases the start-up temperature. For example, the start-up time of a TPCT with CA = 28° at 40 W, 60 W and 80 W is 46%, 50% and 55% shorter than that of a TPCT with a smooth surface and the wall superheat degrees is 55%, 39% and 28% lower, respectively. For TPCTs with combined hydrophilic and hydrophobic properties, the start-up time spent on the evaporator section with hydrophilic properties is shorter than that of the hydrophobic evaporator section and the smaller CA on the condenser section shows better results. The start-up time of a TPCT with CA = 28° on the evaporator section and CA = 105° on the condenser section has the best start-up process at 40 W, 60 W and 80 W which is 14%, 22% and 26% shorter than that of a TPCT with smooth surface. Thus, the hydrophilic and hydrophobic modifications play a significant role in promoting the start-up process of a TPCT.

show abstract

Performance enhancement of a two-phase closed thermosiphon with a thin porous copper coating

Cited by 56 publications

References 37 publications

Study of Heat Pipe Thermal Performance with Internal Modified Geometry

Study of Heat Pipe Thermal Performance with Internal Modified Geometry

A New Project for a Much More Diverse Moroccan Strategic Version: The Generalization of Solar Water Heater

Investigation of Start-Up Characteristics of Thermosyphons Modified with Different Hydrophilic and Hydrophobic Inner Surfaces

Contact Info

Product

Resources

About