A numerical study of the arc-roof and the one-sided roof enclosures based on the entropy generation minimization

Research on the Microclimate of Protected Agriculture Structures Using Numerical Simulation Tools: A Technical and Bibliometric Analysis as a Contribution to the Sustainability of Under-Cover Cropping in Tropical and Subtropical Countries

“…In general terms, it has been observed that the air flow movement will present different velocities depending on the shape of the roof [110]. This same roof geometry will affect the heat transfer values and, therefore, the temperature distribution in that region of the greenhouse [136]. On the other hand, recent studies have recommended the octagonal-type greenhouse because they have better ventilation rates and better temperature distribution compared to greenhouses equipped with side and roof ventilation [137].…”

Heat transfer in a large triangular-roof enclosure based on the second law analysis

“…The entered sun rays to a greenhouse can shine freely to the greenhouse floor, when the entropy generation is reached its lowest value; and then, the process of photosynthesis will occur in the desired form. Finally, plants grow faster [12]. In Fig.…”

“…The two-dimensional incompressible viscous flow governing equations in non-dimensional form and with artificial compressibility has been obtained in our previous work [12]. Also, dimensionless of the volumetric entropy generation in flow (Ṡ l,a ), the irreversibility in heat transfer (Ṡ l,a,f ), the fluid friction (Ṡ l,a,f ), the ratio between the viscous and thermal irreversibilities (ϕ), the bulk temperature (T 0 ) and the dimensionless total entropy generation (Ṡ T ,a ) have been defined in that work.…”

“…1, 2 and 3. The boundary conditions of these models were selected based on the benchmark solution that was used for validation of models [12]. In the benchmark solution the model changes slowly to cited work as the following descriptions:…”

“…Natural convection of the laminar air flow in a large triangular-roof enclosure can be applied for roof of the industrial buildings or greenhouses. Study of the natural convection in right-angle triangular enclosures has been widely conducted in earlier works [9][10][11][12]. Ziapour and Dehnavi introduced an enhanced finite-volume method for solving the arc-roof and the one-sided roof enclosures.…”