Thermohydraulic Performance and Entropy Generation of a Triple-Pass Solar Air Heater with Three Inlets

Phu, Nguyen Minh; Ngo, Tu Thien; Hap, Nguyen Van

doi:10.3390/en14196399

Cited by 17 publications

(7 citation statements)

References 31 publications

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“…The computation time of the local solution is about 0.9 s. Meanwhile, the results can be obtained immediately for the mean solution. The validation of both the solutions can be seen in our previous studies [24,25]. Figure 2a presents a comparison of the air temperature distribution along the collector length between the local solution and of Ramani et al [11].…”

Section: Solution Strategy and Validationmentioning

confidence: 71%

“…(2). The change in air temperature is due to the convective heat exchange with the glass cover and the absorber plate [25]:…”

Section: Local Solutionmentioning

confidence: 99%

“…The energy balance of the back plate is In this model, the air temperature equations are ordinary differential equations (ODEs); boundary conditions for ODEs (2) and (4) are [25] T f 1 x¼0 ðÞ ¼ T a (6)…”

Section: Local Solutionmentioning

confidence: 99%

“…For the mean solution, Eqs. ( 8)-( 12) can be rearranged into a system of linear algebraic [25] and collector efficiency in mean solution (b) [24].…”

Section: Solution Strategy and Validationmentioning

confidence: 99%

“…Figure 2.Validation of local air temperature in local solution (a)[25] and collector efficiency in mean solution (b)[24].…”

mentioning

confidence: 99%

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Heat Transfer in Double-Pass Solar Air Heater: Mathematical Models and Solution Strategy

Hap¹,

Phu²

2023

Heat Transfer - Fundamentals, Enhancement and Applications

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Multipass air collectors are commonly used because they produce higher air temperature than that of a single-pass one due to reduced top heat loss. In this chapter, two mathematical models of convection and radiant heat transfer in a double-pass solar air heater were presented. They included an average temperature model and a model of temperature variation along the airflow direction. The method for solving these two mathematical models was reported. The average temperature model was solved by dealing with a system of linear algebraic equations, whereas the other model was derived as ordinary differential equations and solved by a numerical integration. The calculation programs were developed in EES software. The computation time of temperature variation model was about 0.9 s, but that of the average temperature model was negligible. Outcomes from two solutions were almost identical. The largest error of the outlet air temperature was 2.1%. The models are applicable to multipass collectors with or without recycling airflow.

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Section: Solution Strategy and Validationmentioning

confidence: 71%

“…(2). The change in air temperature is due to the convective heat exchange with the glass cover and the absorber plate [25]:…”

Section: Local Solutionmentioning

confidence: 99%

Section: Local Solutionmentioning

confidence: 99%

“…For the mean solution, Eqs. ( 8)-( 12) can be rearranged into a system of linear algebraic [25] and collector efficiency in mean solution (b) [24].…”

Section: Solution Strategy and Validationmentioning

confidence: 99%

“…Figure 2.Validation of local air temperature in local solution (a)[25] and collector efficiency in mean solution (b)[24].…”

mentioning

confidence: 99%

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