Thermal analysis of greenhouses installed under semi arid climate

Mesmoudi, Kamel; Meguellati, K. H.; Bournet, Pierre-Emmanuel

doi:10.18280/ijht.350304

Cited by 23 publications

(20 citation statements)

References 23 publications

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“…CFD modeling and simulation offer fast numerical solutions to real or prospective scenarios considering structural modifications in the case of buildings. Being a computer-aided simulation tool, CFD has also become a tool to design and optimize greenhouse ventilation systems [14][15][16][17]. The use of CFD has contributed to the optimization of greenhouse ventilation systems in countries such as Spain [15,18], Italy [19], China [20,21] and Mexico [22].…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

Villagrán¹,

Bojacá²

2019

IJHT

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The protected horticultural production in tropical countries such as Colombia takes place mainly under passively ventilated greenhouses. The major drawback of the traditional Colombian greenhouse is its low ventilation rate leading to inadequate microclimates. The purpose of this study was to evaluate the airflow behavior, ventilation rates and thermal distribution effects of a commercial-size greenhouse, due to the gradual increase of the roof ventilation areas. A numerical simulation model was developed under a computational fluid dynamics (CFD) approach following an experimental validation of the simulated scenarios. The results showed that increasing the roof ventilation areas reduced the internal average temperatures by up to 16 %, improved the temperature homogeneity and increased the ventilation rates by up to 191 % with respect to the reference scenario. The findings of this research may serve as a basis to develop alternative greenhouse designs that consider increasing the ventilation areas but within the low-tech context that constrains innovation in the Colombian horticultural sector.

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Section: Introductionmentioning

confidence: 99%

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

Villagrán¹,

Bojacá²

2019

IJHT

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“…The heat balance on the transparent cover of the distiller is given by the following equation [17,[20][21][22][23][24]:…”

Section: Figure 1 Distillation Heat Balancementioning

confidence: 99%

Monthly fresh water yield analysis of three solar desalination units a comparative study in the south Algeria climatic condition

Moungar¹,

Aberqi²,

Sahli³

et al. 2018

IJHT

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The Purpose of the paper is studied three types solar distillers, double slope with and without immersed fins and the simple solar distiller. A monthly comparative study is investigated experimentally, for a long period of the year. Further, the wind speed influence, the distance between fins, the fins height, the fins number and thickness, on the solar distiller's production, is investigated theoretically. From the obtained results, it is noted that for the wind speed greater than 3.5 m/s, a decrease in the productivity is caused by the cooling of the outer walls, and this induces some heat losses, especially at the front and rear walls of the solar still. The distance between fins has no significant effect on the still productivity. Moreover, increasing the fins height, from 2 to 5 cm, increase the productivity; however, when the height changes from 6 to 8 cm, the distillate production goes down. A larger fins number lead for rise the produced distilled water amount. Therefore, one should use the maximum number of fins, while taking into consideration the feasibility of the assembly. Increasing the water mass makes the productivity to go down. The obtained results on June 11, 2016, show that the proposed system productivity was about 15 to 27 % higher than that of a simple one, under the following conditions, i.e. Mw = 42.61 kg, h1 = 3.6 cm, Vw = 3.5 m/s, lw = 5 cm and Nfins = 12. The total annual cost estimation proof clearly that the payback period is less than a years. As well as, it has been found that the increasing lifetime and the interest rate decreasing caused a decrease in the distilled water unit price.

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“…It was reported that OP can be released from sediments and utilized by algae [30]. Moreover, OP in soil can be hydrolyzed by phosphatase and then used by the rhizosphere of plants [31,32]. Thus high content of OP in sludge may play an important role in P recycle when land application of sludge as P fertilizer is taken into consideration.…”

Section: P Fractionation In Sludge By Smt Protocolmentioning

confidence: 99%

Species and Bio-Availability of Inorganic and Organic Phosphorus in Primary, Secondary and Digested Sludge

Zhang¹,

Huang²,

D³

2018

Preprint

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The species and bio-availability of phosphorus (P) in primary, secondary and digested sludge were fractionated and further analyzed in this study. Results showed that inorganic P (IP) was the primary P fraction in the secondary sludge and digested sludge, in which non-apatite IP (NAIP) amounted to 91.6% and 69.3% of IP, respectively. Organic P (OP), accounting for about 71.7% of total P (TP), was the dominant P composition in primary sludge. The content of bio-available P was about 9.7, 43.4, 29.8 mg-P/g-TS in primary sludge, secondary sludge and digested sludge, respectively, suggesting secondary sludge is the optimal choice when land application of sewage sludge is taken into consideration, followed by digested sludge and primary sludge. Polyphosphate and orthophosphate, comprising approximately 54.3% and 89.2% of TP, was the dominant P species in the secondary sludge and digested sludge, respectively. Monoester-P (54.6% of TP in extract) and diester- P (24.1%) were identified as OP species in primary sludge by Phosphorus-31 nuclear magnetic resonance (31PNMR). The present results would be helpful for P recovery and recycle from sewage sludge in wastewater treatment plant.

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Thermal analysis of greenhouses installed under semi arid climate

Cited by 23 publications

References 23 publications

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

CFD Simulation of the Increase of the Roof Ventilation Area in a Traditional Colombian Greenhouse: Effect on Air Flow Patterns and Thermal Behavior

Monthly fresh water yield analysis of three solar desalination units a comparative study in the south Algeria climatic condition

Species and Bio-Availability of Inorganic and Organic Phosphorus in Primary, Secondary and Digested Sludge

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