Experimental and numerical investigation of a cross flow air-to-water heat pipe-based heat exchanger used in waste heat recovery

Ramos, J.B.; Chong, A.; Jouhara, Hussam

doi:10.1016/j.ijheatmasstransfer.2016.06.100

Cited by 76 publications

(25 citation statements)

References 39 publications

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“…Excessive transmission oil temperature can increase the inner leaking and cavitation due to the decreased oil viscosity of the wheel loader, which not only reduces the efficiency of the working device but also affects the life of the drivetrain. 31,32 Improvements to the engine compartment Based on the analysis of the preceding section, the following improvements are made to the engine compartment of the XG956 wheel loader. Due to the reduced airflow from the horizontal inlet, we eliminated the side entrances of the engine compartment ( Figure 11).…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

Qin

Yang

et al. 2018

Advances in Mechanical Engineering

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This study establishes a thermal management model to improve the heat exchange performance and uniformity of the flow-field distribution in the engine compartment of a wheel loader. Flow-field analyses are performed for an XG956 wheel loader in a virtual wind tunnel using the combined engine compartment thermal management model and computational fluid dynamics. The Fluent calculations revealed various problems. For example, the inlet flow rate at both sides of the engine compartment is small, which accounts for about 8.5% of the total flow, and the flow uniformity of radiator becomes worse with the increase in the air flow. The original cooling system is improved based on the simulation results and then verified by field testing. A comparison of the test data with the simulations indicates that the values obtained using the thermal management model of the engine compartment are largely in agreement with the experimental values, with a maximum deviation of the heat transfer rate at the rated speed of 5.1%. The research method presented in this article could further help to increase the productivity of the non-road mobile machinery cooling system and lower design costs. The temperature of pressurized air, hydraulic oil, transmission oil, and engine cooling fluid decreased by 22.5%, 8.7%, 2.2%, and 8.4% in the improved loader, respectively.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

Qin

Yang

et al. 2018

Advances in Mechanical Engineering

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“…Researchers have done a lot of work to improve the performance of such type of HExs. Ramos et al 3 analyzed thermal performances of CFHEx by CFD and numerical approaches. They performed experiments and compared thermal performances (numerical outputs) with CFD, finding that the predictions are nearly 10% of experimental outputs.…”

Section: Introductionmentioning

confidence: 99%

Experimental exergy and entransy analyses on designed and fabricated crossflow heat exchanger

et al. 2020

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A crossflow heat exchanger (CFHEx) is designed and fabricated in a workshop. For designing this heat exchanger (HEx), the number of passes, frontal areas, HEx volumes, heat transfer areas, free‐flow areas, ratios of minimum free‐flow area to frontal area, densities, mass flow rates of flowing fluids, maximum/minimum heat capacities, heat capacity ratio, outlet temperatures of hot/cold fluids, average temperatures, mass velocities, Reynolds numbers, and convective heat transfer coefficients are evaluated by considering Colburn/friction factors. After fabrication of the HEx, effectiveness, exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, entransy dissipation number, and entransy effectiveness for hot/cold fluids sides are found at different flow rates and inlet temperatures of fluids. By experimental results, optimum operating conditions are found, which gives maximum effectiveness and entransy effectiveness but minimum rates of exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, and entransy dissipation number for the fabricated CFHEx. This study is concluded as follows: minimum exergy destruction and entransy dissipation rates (ie, 3.061 kJ/s·K and 1125.44 kJ·K/s, respectively) are found during experiment 2. Maximum entransy effectiveness of hot/cold fluids (ie, 0.689/0.21) is achieved in experiment 1. Moderate values of entransy dissipation number (ie, 4.689), entransy dissipation‐based thermal resistance (ie, 0.04 s·K/J), exergy destruction (ie, 3.845 kJ/s·K), and entransy dissipation (ie, 1374.04 kJ·K/s) rates are found during experiment 1. Maximum effectiveness (ie, 0.4) for the fabricated HEx is also obtained through experiment 1. After comparative analyses, it is found that experiment 1 provides optimum results, which shows the best performance of the fabricated HEx.

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“…heating, ventilation and air conditioning (HVAC) systems, sorption and vapor-compression heat pumps, cooling of central processing units, power plant cooling towers, steam condensers, recuperators, domestic heating, solar water heating, solar desalination systems, solar thermal power generation, thermal energy storage, thermal collector as well as for waste heat recovery units, automobiles etc. 1,2,[6][7][8][9][10][11][12][13][14][15] Several investigators have studied the effects of various parameters on the performance of heat pipes viz. the effects of wick, 16,17 fin, 18 inclination angle of heat pipe, 19 filling ratio and vacuum level inside the heat pipe, 20 variable conductance heat pipe, 17,21 length-toinner-diameter ratio on entrainment limit of heat pipe, 22 use of nano-fluids, [23][24][25][26] pulse heating on oscillating-flow heat pipe, 27 etc.…”

Section: Introductionmentioning

confidence: 99%

Parametric studies on interacting parameters influencing heat pipe performance

Kumar

Jain

Shah

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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The performance of a heat pipe is governed by many parameters, the effects of which may influence each other. Hence, it is utmost important to optimize the combination of these parameters for an effective energy transfer in a heat pipe. In the present study, the interacting effects of four different parameters affecting the effectiveness of heat pipe are studied namely the fluid filling ratio (20%, 30%, 40%), the pressure inside the heat pipe (0.2 bar, 1 bar, 1.8 bar), the number of wick layers (0, 1, 2) and the inclination angle of heat pipe (0°, 45°, 90°). The response surface method based on central composite design approach is applied to optimize the number of experiments. The effects of interacting parameters on the effectiveness of heat pipe are discussed. Among the various parameters, the pressure inside the heat pipe was found to be the most important parameter followed by the fluid filling ratio, the inclination of heat pipe and the number of wick layers. From the analysis, the optimum combination of parameters was obtained as 40% filling ratio, 0.2 bar pressure, 2 wick layers and 0° inclination. At this point, the effectiveness predicted with the model and obtained through experiments was found to be 0.630 and 0.649 respectively. Based on the experimental results, a quadratic empirical model is developed which predicts the effectiveness of heat pipe within [Formula: see text]% of the experimental results for different operating conditions of heat pipe.

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Experimental and numerical investigation of a cross flow air-to-water heat pipe-based heat exchanger used in waste heat recovery

Cited by 76 publications

References 39 publications

Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

Heat exchange performance optimization of a wheel loader cooling system based on computational fluid dynamic simulation

Experimental exergy and entransy analyses on designed and fabricated crossflow heat exchanger

Parametric studies on interacting parameters influencing heat pipe performance

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