@article {1274,
	title = {On the Determination of the Convective Heat Transfer Coefficient at the Greenhouse Cover under Semi Arid Climatic Conditions},
	journal = { Acta Horticulturae},
	volume = {Vol: 927},
	year = {2012},
	pages = { pp :619-626},
	abstract = {
	Crop cultivation in greenhouses under semi-arid climatic conditions is subject to various stresses, in particular during the winter season at night, when the interior air is poorly controlled, leading to prolonged periods of low temperature. The aim is then to evaluate and control the heat exchanges of the enclosure in order to prevent low indoor air temperatures and reduce the thermal load of the greenhouse. The objectives of this study are to investigate the convective and radiative heat exchanges at the cover in order to establish new correlations for the convective heat transfer coefficients in semi arid regions. The climatic parameters were measured inside and outside a closed empty glasshouse without crop, for three different nights during the winter season in the semi-arid land of Algeria. A physical model for analysing the convective heat transfers was implemented, and new correlations were established, parameterised, calibrated and validated thoroughly. A significant difference was observed between the correlations obtained by this study and the models obtained for other greenhouse designs under different climatic conditions. Results show that the convection mode along the inside wall of the cover is free turbulent. Conversely, the convection mode along the outside greenhouse cover remains forced turbulent. A consistent performance of the correlations was observed, both in the calibration and validation stages.

},
	url = {http://www.actahort.org/books/927/927_76.htm},
	author = {K MESMOUDI and A SOUDANI and S BOUGOUL and P. E BOURNET}
}
@article {1272,
	title = {Thermal Performance of an Unheated Greenhouse under Semi-Arid Conditions during the Night.},
	journal = { Bournet. Acta Horticulturae},
	volume = {vol. 952},
	year = {2012},
	pages = {pp: 417-424},
	abstract = {
	The aim of this work is to analyze the thermal performance of a greenhouse exposed to semi-arid conditions by investigating experimentally the heat transfers occurring through the walls and ground. A closed unheated Venlo greenhouse without crop in the area of Batna (southern Mediterranean basin) was considered. The study focuses on the effects of (i) the thermal inertia of the soil, (ii) the radiative losses through the cover, and (iii) the convection mode and flow regime on the heat transfer coefficients. Experiments were conducted from January to March 2008 under clear or cloudy skies, and low or high wind velocities. From the results, it is concluded that the heat stored in the ground of the greenhouse represents a significant heat source which can compensate the energy losses through the walls, especially during a night preceded by a high diurnal insulation. This process can maintain an average inside - outside temperature difference during the night within the range [1.59-2.81] K. Results also show that the radiation losses are the main component of the energy losses of the greenhouse, mainly through the outside wall surface of the cover. Conversely, the radiative heat exchange along the inner wall represents the main heat supply to this wall. The convection mode inside the greenhouse induced by the air movement seems to play a significant role on the convective exchange coefficient inside the greenhouse. These coefficients both inside and outside the greenhouse were estimated and analyzed, and a good agreement with the models reported in the literature was found. This study could help growers define and adapt their heating strategy to avoid undesired low temperatures which may damage their crops at night.

},
	url = {http://www.actahort.org/books/952/952_52.htm},
	author = {K MESMOUDI and S BOUGOUL and P. E BOURNET}
}
@proceedings {1346,
	title = {The Convection Heat Transfert Coefficient at the Greenhouse Cover under Semi Arid Climatic Conditions\&rdquo; from 22 to 25 April},
	journal = {The second international conference on conversion energy and conservation},
	year = {2010},
	address = {Hammamet, Tunisia},
	author = {K MESMOUDI and A SOUDANI and P. E BOURNET and S BOUGOUL}
}
@proceedings {1332,
	title = {Heat Transfer Conductance at the Greenhouse Cover, WERA\&rsquo;, , 28-29 Septembre,},
	journal = {Work Shop International sur les Energies renouvelables et leurs Application},
	year = {2010},
	address = { Batna- Alg{\'e}rie.},
	author = {K MESMOUDI and A SOUDANI and P. E BOURNET and S BOUGOUL}
}
