Study on parameters effective on the performance of a humidification-dehumidification seawater greenhouse using support vector regression

Journal of Water Reuse and Desalination

Miroliaei

2022

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Humidification–dehumidification desalination (HDH) is one of the suitable methods for desalination of saline and brackish water in a small scale. In this research, a HDH desalination method with a direct contact dehumidifier has been analyzed theoretically and experimentally. The setup consists of two similar packing towers for humidification and dehumidification, 10 inches in diameter, which are filled up to 1 m with Rushing packing. In this new HDH configuration, seawater and freshwater recirculation has been used in humidifier and dehumidifier sections, respectively. A steady-state mathematical model based on the mass and energy equations for each system component is presented. The effect of various input parameters on the freshwater production, gain output ratio (GOR) and specific energy consumption has been investigated. The results revealed that the inlet seawater and air temperature to the humidification tower had the highest and the lowest effect on the produced freshwater, respectively. Also, the maximum value of the GOR is 3.3, which is obtained in the equilibrium condition of the dehumidifier. The experiments show that the freshwater production of the proposed HDH device is 300 L/day, which can provide water for domestic consumption of a small family.

Section: Introductionmentioning

confidence: 99%

Performance evaluation of an HDH desalination system using direct contact packed towers: experimental and mathematical modeling study

Journal of Water Reuse and Desalination

Miroliaei

2022

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“…Not to mention that, utilizing other sources such as low-temperature waste heat sources or solar energy, and the like, is unfortunately not possible yet. [11][12][13][14][15][16][17][18] In recent years, adsorption desalination technology has been developed for the purpose of producing desalinated water and cooling in a way that applying low-temperature waste heat, solar or geothermal energy, as inputs, has become an option. By means of this technology, dependence on conventional desalination and cooling technologies which undoubtedly contribute to high energy consumption has noticeably reduced.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of an improved adsorption desalination system under different operating conditions

Amirfakhraei

Proceedings of the Institution of Mechanical Engineers, Part E:

Khorshidi

2021

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This paper presents the development of an advanced adsorption desalination system (ADS) with heat and mass recovery. By means of internal heat and mass recovery, this adsorption desalination system (ADS), offers a significantly higher performance ratio compared to the conventional systems. After vapor desorption, the pressure difference in the hot bed is first transmitted to the cold bed using mass recovery. Then, the heat from the hot bed is transferred into the cold bed and, eventually, to the condenser and evaporator, by means of the cold water. Numerical simulations for this system are compared to a verified experimental model, and then developed to study the effect of the operating parameters. The level of SDWP or specific daily water production for this ADS was found to be 13.48 m^3/ton of silica gel/day at a hot water temperature of 92.5 (°C) and a cold water temperature of 30 (°C). Consequently, in these operating conditions, the SDWP of the advanced ADS was found to be 153% more than the conventional ADS. Also, at the same temperature conditions, the performance ratio of the ADS with heat and mass recovery was 35% higher than the ADS without heat and mass recovery.

“…This method has some advantages, including flexible capacity, low installation, and operational costs, ease of use and utilization of clean and renewable energies. 19,20 There are several devices tested for air humidification in the humidifier such as packed bed, wetted walls, spray towers, and air bubble columns. 21 The good gas and liquid contacting is the main objective in all humidifier devices.…”

Section: Introductionmentioning

confidence: 99%

“…This method has some advantages, including flexible capacity, low installation, and operational costs, ease of use and utilization of clean and renewable energies. 19,20…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational fluid dynamics modeling of a novel tray humidifier column in humidification dehumidification desalination; evaluation of hydrodynamic and heat transfer characteristics

Proceedings of the Institution of Mechanical Engineers, Part E:

Jahromi

Karachi

2020

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In this article, a novel tray humidifier column for humidification dehumidification desalination was proposed. The performance of the humidifier column has been investigated with experimental and computational fluid dynamics simulations. The hydrodynamics and heat transfer characteristics of this tray humidifier has been studied. A stainless steel sieve tray with a rectangular cross section with a dimension of 20 × 50 cm was used in the experimental study. In computational fluid dynamics modeling, a transient three-dimensional model has been developed based on the volume of fluid framework by using standard k-epsilon model. The effect of air and seawater flow rate and inlet seawater temperature on the exit air temperature has been investigated. The results show that the humidifier effectiveness of the tray humidifier column varies between 0.67 and 0.87 depending on operating conditions. Then, tray column can be used in humidification dehumidification desalination systems with advantages such as compact equipment, low-pressure drop, and handling solids or other sources of fouling.