Thermohydraulic performance of solar air heater with staggered multiple V-shaped ribs on the absorber plate

Jin, Dong; Zuo, Jianguo; Quan, Shenglin; Xu, Shiming; Gao, Hao

doi:10.1016/j.energy.2017.03.101

Cited by 82 publications

(29 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e baffle and rib always select to enhance heat transfer rate and performance in the channel or tube heat exchanger [1][2][3][4][5]. e baffle and rib give high heat transfer rate and thermal efficiency when compared with the other types of the generators, especially, V-shaped rib/baffle [6][7][8][9][10][11][12][13][14][15]. However, it is found that the installation of the V-rib is quite difficult.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Flow and Heat Transfer Mechanisms in the Heat Exchanger Channel with V-Orifice at Various Blockage Ratios, Gap Spacing Ratios, and Flow Directions

Boonloi

Jedsadaratanachai

2019

Modelling and Simulation in Engineering

View full text Add to dashboard Cite

Numerical assessments in the square channel heat exchanger installed with various parameters of V-orifices are presented. The V-orifice is installed in the heat exchanger channel with gap spacing between the upper-lower edges of the orifice and the channel wall. The purposes of the design are to reduce the pressure loss, increase the vortex strength, and increase the turbulent mixing of the flow. The influence of the blockage ratio and V-orifice arrangement is investigated. The blockage ratio, b/H, of the V-orifice is varied in the range 0.05–0.30. The V-tip of the V-orifice pointing downstream (V-downstream) is compared with the V-tip pointing upstream (V-upstream) by both flow and heat transfer. The numerical results are reported in terms of flow visualization and heat transfer pattern in the test section. The thermal performance assessments in terms of Nusselt number, friction factor, and thermal enhancement factor are also concluded. The numerical results reveal that the maximum heat transfer enhancement is found to be around 26.13 times higher than the smooth channel, while the optimum TEF is around 3.2. The suggested gap spacing for the present configuration of the V-orifice channel is around 5–10%.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Study on Flow and Heat Transfer Mechanisms in the Heat Exchanger Channel with V-Orifice at Various Blockage Ratios, Gap Spacing Ratios, and Flow Directions

Boonloi

Jedsadaratanachai

2019

Modelling and Simulation in Engineering

View full text Add to dashboard Cite

show abstract

“…This is the field where solar air heaters were developed and investigated. Many scientists are analyzing solar air heaters, based on their performance and upgrades, in order to increase their efficiency [15][16][17][18]. A detailed review of current solar air heaters, their design configurations, methods of improvement, and applications, was presented by Kabeel et al [19].…”

Section: Introductionmentioning

confidence: 99%

Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant

2018

View full text Add to dashboard Cite

Air heaters are commonly used devices in steam power plants. In base-loaded conventional power plants, air heaters usually use flue gases for air heating. In this paper, the air heater from a marine steam propulsion plant is analyzed, using superheated steam as a heating medium. In a marine propulsion plant, flue gases from steam generator are not hot enough for the air heating process. In a wide range of steam system loads, the analyzed steam air heater has low energy power losses and high energy efficiencies, ranging from 98.41% to 99.90%. Exergy analysis of the steam air heater showed that exergy destruction is quite high, whereas exergy efficiency ranged between 46.34% and 67.14%. Air heater exergy destruction was the highest, whereas exergy efficiency was the lowest at the highest steam system loads, which was an unexpected occurrence because the highest loads can be expected in the majority of marine steam plant operations. The change in the ambient temperature significantly influences steam air heater exergy efficiency. An increase in the ambient temperature of 10 °C reduces analyzed air heater exergy efficiency by 4.5%, or more, on average.

show abstract

“…The V-shaped baffle gives high effectiveness to augment heat transfer and thermal performance in comparison with other types of the vortex generator. For examples, Jin et al (2017) numerically studied flow and heat transfer behavior in a solar air heater system with staggered multiple V-shaped ribs on the absorber plate. The influences of rib height, pitch, attack angle and Reynolds number were considered.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer, Friction Factor and Thermal Performance in a Round Tube Equipped With the Modified v-Shaped Baffle

Jedsadaratanachai¹,

Boonloi²

2018

Frontiers in Heat and Mass Transfer

View full text Add to dashboard Cite

Convective heat transfer, pressure loss and thermal performance in a heat exchanger tube inserted with the modified V-shaped baffle are investigated numerically. The influences of the flow attack angle (α = 20 o , 30 o and 45 o), baffle height in term of blockage ratio (b/D = BR = 0.05, 0.10, 0.15, 0.20 and 0.25) and arrangement (The V-tip pointing downstream is called "V-Downstream", while the V-tip pointing upstream is named "V-Upstream".) on heat transfer and friction loss are presented for the Reynolds number in range 100-1200 (laminar region). The numerical study (finite volume method) is selected to solve the current investigation and to describe the mechanisms inside the heat exchanger tube. The flow visualizations and heat transfer characteristics in the heat exchanger tube are plotted in the numerical-result report. The results on heat transfer, friction factor and thermohydraulic performance of the test tube are compared with the smooth circular tube. It is found that the vortex strength in the heat exchanger tube is an important factor to enhance heat transfer rate and thermal performance. In addition, the maximum thermal enhancement factor is around 3.22 at α = 30 o , BR = 0.2, Re = 1200 for V-Upstream arrangement.

show abstract

Thermohydraulic performance of solar air heater with staggered multiple V-shaped ribs on the absorber plate

Cited by 82 publications

References 25 publications

Numerical Study on Flow and Heat Transfer Mechanisms in the Heat Exchanger Channel with V-Orifice at Various Blockage Ratios, Gap Spacing Ratios, and Flow Directions

Numerical Study on Flow and Heat Transfer Mechanisms in the Heat Exchanger Channel with V-Orifice at Various Blockage Ratios, Gap Spacing Ratios, and Flow Directions

Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant

Convective Heat Transfer, Friction Factor and Thermal Performance in a Round Tube Equipped With the Modified v-Shaped Baffle

Contact Info

Product

Resources

About