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Enhancement of freshwater production of the seawater greenhouse condenser

Journal of Arid Land 2021年第4期13卷 397-412页

作者： Tahani K BAIT SUWAILAM Abdulrahim M AL-ISMAILI Nasser A AL-AZRI L H Janitha JEEWANTHA hemesiri kotagama Department of Soils Water and Agricultural EngineeringSultan Qaboos UniversityAl-Khoud 123Oman Department of Mechanical and Industrial Engineering Sultan Qaboos UniversityAl-Khoud 123Oman Department of Natural Resource Economics Sultan Qaboos UniversityAl-Khoud 123Oman

Seawater greenhouse(SWGH)is a technology established to overcome issues related to open field cultivation in arid areas,such as the high ambient temperature and the shortage of *** adopts the humidification-dehumidification concept where evaporated moisture from a saline water source is condensed to produce freshwater within the greenhouse *** condenser designs are adopted to increase freshwater production in order to meet the irrigation *** aim of this study was to experimentally investigate the practicality of using the packed-type direct contact condenser in the SWGH to produce more freshwater at low costs,simple design and high efficiency,and to explore the impact of the manipulating six operational variables(inlet air temperature of the humidifier,air mass flowrate of the humidifier,inlet water temperature of the humidifier,water mass flowrate of the humidifier,inlet water temperature of the dehumidifier and water mass flowrate of the dehumidifier)on freshwater condensation *** this purpose,a direct contact condenser was designed and ***-four full factorial experiments were conducted to study the effect of the six operational *** variable was operated at two levels(high and low flowrate),and each experiment lasted for 10 min and followed by a 30-min waiting *** showed that freshwater production varied between 0.257 and 2.590 L for every 10 *** using Minitab statistical software to investigate the significant variables that contributed to the maximum freshwater production,it was found that the inlet air temperature of the humidifier had the greatest influence,followed by the inlet water temperature of the humidifier;the former had a negative impact while the latter had a positive impact on freshwater *** response optimizer tool revealed that the optimal combination of variables contributed to maximize freshwater production when all variables were in the high mode and the inlet air

关键词： seawater greenhouse humidification-dehumidification direct contact condenser freshwater production water desalination

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Water, land, and energy use efficiencies and financial evaluation of air conditioner cooled greenhouses based on field experiments

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Journal of Arid Land 2021年第4期13卷 375-387页

作者： Ibtihal AL-MANTHRIA Abdulrahim M AL-ISMAILIA hemesiri kotagamaB Mumtaz KHANC L H Janitha JEEWANTHAD Department of Soils Water and Agricultural EngineeringSultan Qaboos UniversityMuscat PC123Oman Department of Natural Resource Economics Sultan Qaboos UniversityMuscat PC123Oman Department of Plant Science College of Agricultural and Marine SciencesSultan Qaboos UniversityMuscat PC123Oman Centre for Future Materials University of Southern QueenslandToowoomba QLD 4350Australia School of Mechanical and Electrical Engineering University of Southern QueenslandToowoomba QLD 4350Australia

High temperature and humidity can be controlled in greenhouses by using mechanical refrigeration cooling system such as air conditioner(AC)in warm and humid *** study aims to evaluate the techno-financial aspects of the AC-cooled greenhouse as compared to the evaporative cooled(EV-cooled)greenhouse in winter and summer *** quonset single-span prototype greenhouses were built in the Agriculture Experiment Station of Sultan Qaboos University,Oman,with dimensions of 6.0 m long and 3.0 m *** AC-cooled greenhouse was covered by a rockwool insulated polyethylene plastic sheet and light emitting diodes(LED)lights were used as a source of light,while the EV-cooled greenhouse was covered by a transparent polyethylene sheet and sunlight was used as light *** cultivars of high-value lettuce were grown for *** evaluate the technical efficiency of greenhouse performance,we conducted measures on land use efficiency(LUE),water use efficiency(WUE),gross water use efficiency(GWUE)and energy use efficiency(EUE).Financial analysis was conducted to compare the profitability of both *** results showed that the LUE in winter were 10.10 and 14.50 kg/m^(2) for the AC-and EV-cooled greenhouses,***,the values reduced near to 6.80 kg/m^(2) in both greenhouses in *** WUE of the AC-cooled greenhouse was higher than that of the EV-cooled greenhouse by 3.8%in winter and 26.8%in *** GWUE was used to measure the total yield to the total greenhouse water consumption including irrigation and cooling water;it was higher in the AC-cooled greenhouse than in the EV-cooled greenhouse in both summer and winter seasons by almost 98.0%–99.4%.The EUE in the EV-cooled greenhouse was higher in both *** analysis showed that in winter,gross return,net return and benefit-to-cost ratio were better in the EVcooled greenhouse,while in summer,those were higher in the AC-cooled *** values of internal rate o

关键词： land use efficiency energy use efficiency water use efficiency gross water use efficiency financial evaluation air conditioner cooled greenhouse evaporative cooled greenhouse

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