Thermoeconomic Analysis of Reducing Exergy Losses in Greenhouses with Hydroponic Cultivation System through Drainage Recycling and Formation of Water Quality Pyramid

Document Type : Original Article

Authors

1 Department of Energy Engineering, Sharif University of Technology, Tehran, Iran

2 AgriculturalEngineering Research Institute, Agricultural Research, Education and Extention Organization

3 Departmentof Chemical Engineering, Sharif University of Technology, Tehran, Iran

Abstract

Employing non-conventional water resources along with treatment and recycling is considered the main resource in addressing future water scarcity. Although non-conventional water recycling has been investigated in details in the literature, its impacts on irrigation-fertilizing systems have not been discussed using thermo-economic analysis.  In this case study, using a hydroponic greenhouse system for rose cultivation, exergoeconomic cost was investigated in a recycling process by comparing three systems including: an open cycle, an open cycle considering exergy abatement cost, and a close cycle (nutrition water recycling). Results have shown that the exergoeconomic cost for producing 212,500 rose cut-flowers in a 6-month cold period, when heat was supplied by boiler for the above mentioned scenarios, were about 15,760 $, 16,525 $ and 14,718 $ respectively. Also, the thermo-economic indicators of the unit exercoeconomic costs for above mentioned scenarios were 74.2, 77.8 and 69.3 $Gj-1respectively. In the close cycle, the drainage of water recycling decreased total exergy losses by 4.02 Gj.y-1, of which 1.24 Gj.y-1 reduction was due to the reduced inlet water and 1.91 Gj.y-1 for the inlet fertilizer reduction, while an increase of  1.12 Gj.y-1 occurred by the electricity consumption of the system . The presented water quality pyramid, based on the unit exergoeconomic cost, indicated 459.9 Gj.y-1 as the highest peak value for the nutrition feed and zero for the wastewater at the base of the pyramid. 

Keywords

References

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Energy Engineering and Management
Volume 13, Issue 1
March 2023
Pages 74-89

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