Computation of surface radiation and natural convection in a heated horticultural greenhouse
This study analyses the effects of the radiation exchange inside a horticultural greenhouse, under winter climatic conditions, according to the number of squared heating tubes used. These ones, hot and isothermal, are equidistant inside the greenhouse volume. The governing differential equations are...
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| Veröffentlicht in: | Applied energy 2010-03, Vol.87 (3), p.894-900 |
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| creator | Mezrhab, Ahmed Elfarh, Larbi Naji, Hassan Lemonnier, D. |
| description | This study analyses the effects of the radiation exchange inside a horticultural greenhouse, under winter climatic conditions, according to the number of squared heating tubes used. These ones, hot and isothermal, are equidistant inside the greenhouse volume. The governing differential equations are discretized using a finite volume method and the coupling pressure–velocity problem is carried out by the SIMPLER algorithm. The algebraic systems obtained are solved by a conjugate gradient method. Results are reported in terms of isotherms, streamlines and average Nusselt number for Rayleigh number of 10
3–10
6. The contour lines show that the radiative effects are noted near the solid surfaces, and become increasingly important when the Rayleigh number increases. As a result, the rise in the value of Rayleigh number leads to an increase of the overall heat transfer within the greenhouse. |
| doi_str_mv | 10.1016/j.apenergy.2009.05.017 |
| format | Article |
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3–10
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3–10
6. The contour lines show that the radiative effects are noted near the solid surfaces, and become increasingly important when the Rayleigh number increases. As a result, the rise in the value of Rayleigh number leads to an increase of the overall heat transfer within the greenhouse.</description><subject>Applied sciences</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Finite volume method</subject><subject>Heat transfer</subject><subject>Horticultural greenhouse</subject><subject>Horticultural greenhouse Surface radiation Natural convection Finite volume method View factors</subject><subject>Miscellaneous</subject><subject>Natural convection</subject><subject>Natural energy</subject><subject>Physics</subject><subject>Solar energy</subject><subject>Surface radiation</subject><subject>Theoretical studies. Data and constants. 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These ones, hot and isothermal, are equidistant inside the greenhouse volume. The governing differential equations are discretized using a finite volume method and the coupling pressure–velocity problem is carried out by the SIMPLER algorithm. The algebraic systems obtained are solved by a conjugate gradient method. Results are reported in terms of isotherms, streamlines and average Nusselt number for Rayleigh number of 10
3–10
6. The contour lines show that the radiative effects are noted near the solid surfaces, and become increasingly important when the Rayleigh number increases. As a result, the rise in the value of Rayleigh number leads to an increase of the overall heat transfer within the greenhouse.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.apenergy.2009.05.017</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0003-0508-3979</orcidid><orcidid>https://orcid.org/0000-0002-5994-7958</orcidid><orcidid>https://orcid.org/0000-0001-6013-7496</orcidid></addata></record> |
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| ispartof | Applied energy, 2010-03, Vol.87 (3), p.894-900 |
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| source | RePEc; Access via ScienceDirect (Elsevier) |
| subjects | Applied sciences Energy Energy. Thermal use of fuels Exact sciences and technology Finite volume method Heat transfer Horticultural greenhouse Horticultural greenhouse Surface radiation Natural convection Finite volume method View factors Miscellaneous Natural convection Natural energy Physics Solar energy Surface radiation Theoretical studies. Data and constants. Metering View factors |
| title | Computation of surface radiation and natural convection in a heated horticultural greenhouse |
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