Performance investigation of a novel solar hybrid air conditioning and humidification–dehumidification water desalination system

Elattar, H.F.; Fouda, A.; Nada, S.A.

doi:10.1016/j.desal.2015.12.023

Cited by 82 publications

(17 citation statements)

References 26 publications

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“…As shown in Table , the COP of the current system has no big difference with those of the comparable systems; in addition, the water productivity of the current system is much higher than that presented by Nada et al and Fouda et al and has approximately similar value with Nada et al and less than the system of Elattar et al This can be attributed to that the systems proposed by Nada et al are differed in operating conditions and the systems' COPs are calculated based on the refrigeration capacity ( Q • ref ) rather than room cooling load ( Q • R ). In addition, the current system COP is closer to those of Fouda et al and Elattar et al; this is due to the difference in operating conditions of the comparable systems (RSHF = 0.9) and current system (RSHF = 0.6); moreover, the nature of the current deep cooling system consumes more energy for operation and in turn leads to lower COP.…”

Section: Resultsmentioning

confidence: 99%

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

2019

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Summary Huge amount of energies is consumed by the air conditioning (A/C) to maintain the required temperature and humidity inside spaces/applications of high humidly. An innovative A/C system that recovers the condenser heat in process air reheating and other useful thermal utilization is presented and investigated in this paper. For high coefficient of performance (COP) of the AC and more energy‐efficient system, the cold exhaust air rejected by the air condition system is also utilized to cool the condenser of the AC system. Huge amount of the water condensate from the system is also utilized as freshwater production. Performance of the proposed system is analytically investigated for different operating conditions and system capacities. Mathematical model of the systems is developed and solved numerically using Engineering Equation Solver (EES) software. Results show that the proposed system enhances the COP and decreases the electric power consumption. The saving in electric power consumption, COP, and the freshwater production rate of the system increases with decreasing room‐sensible heat factor, fresh air ratio, and outdoor air temperature and humidity. Moreover, the COP of the proposed system is 90% higher than COP of the basis system, and the savings in the running cost of the system increase by 4.5 times with decreasing the room‐sensible heat factor (RSHF) from 0.6 to 0.2. In addition, the highest COP attained by the proposed system is 2.72, and the corresponding freshwater production rate is 373.8 kg/h.

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Section: Resultsmentioning

confidence: 99%

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

2019

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“…Disregarding the terms of kinetic and potential energies in conservation of energy equations 22 The brine water and air wet‐bulb temperatures at the humidifier exits are the same 1,16,17 Water vapor leaving the humidifier is free salts 35 …”

Section: Mathematical Modelmentioning

confidence: 99%

“…Recently, several solar assisted HDH water desalination systems were developed to improve the zero‐energy enhancement of the system 15‐17 . Shalaby et al 18 developed a mathematical model for the thermal analysis of the HDH solar water desalination systems.…”

Section: Introductionmentioning

confidence: 99%

Humidification‐dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

et al. 2020

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Summary A study of the performance enhancement of a humidification‐dehumidification (HDH) system integrated with multiple evaporators/condensers heat pump (HP) and heat recovery units is presented. The HP unit is intended to deliver necessary heating for humidifier and heating/cooling for dehumidifier in a new strategy. The proposed integrated system is capable to produce fresh water from the HDH system and HP unit. Four different configurations of the system formed by excluding/adding condensers and evaporators were investigated; mode‐A (seawater precooling and reheating), mode‐B (seawater reheating), mode‐C (seawater precooling and humid air reheating), and mode‐D (humid air reheating). Fresh water productivity, fresh water ratio, system water recovery, gain output ratio, specific work consumption, and fresh water production cost were used as performance measuring parameters of the system. The influences of operating parameters on the system performance were analytically studied and experimentally validated for different system configurations. The results indicate the enhancement of the systems' performance with increasing ambient air temperature and humidity, seawater and air flow rates, and with decreasing seawater temperature. The system configuration of mode‐B shows the best performance with fresh water production of 61.94 kg/h and gain output ratio of 4.97 which are higher than those of the other configurations by 13%, 55%, 85% and 11%, 48%, and 75%, respectively. Comparisons of the proposed configurations with the other HDH desalination systems available in the literature were presented and better performance of the proposed systems was noticed.

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“…Solar HDH unit integrated with an air conditioning system has been studied experimentally and numerically by Elatter et al 22 The proposed system has higher productivity, cooling capacity, and lower energy consumption. An integrated HDH desalination unit with a refrigeration cycle using the waste heat recovery from the condenser and evaporator in desalination is presented by Srithar et al 23 The conducted experiments revealed the enhancement of the COP of the new refrigerator up to 7.6.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of two‐stage humidification‐dehumidification desalination system integrated with an innovative oxy‐hydrogen ( HHO ) system

et al. 2021

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The current research experimentally investigated a sustainable desalination method to maximize freshwater production at minimal costs. Solar photovoltaics are used as a source of clean and renewable energy. The system used in conducting the experiments consists of: an air heater, water heater, two stages of cross-flow humidification, two stages of cross-flow dehumidification, and an oxyhydrogen gas generator. The setup's working principle is the open-air and closed water cycle. A centrifugal fan blows the ambient air to pass through the air heater. Air is heated through a heat exchanger, which is consequently heated by hot water. Water is heated using a new heating approach by using a mixture of 20% natural gas and 80% hydrogen gas with less impact on environmental pollution. Air is then humidified through two-stage humidification systems using a high water temperature technique, then through the innovative vibrating plate circuit, respectively. The humidified air is condensed through two consecutive dehumidification heat exchangers. The system parameters are optimized to enhance freshwater productivity. The studied operative parameters are air mass flow rate, water mass ratio (WMR), and the effect of adding a second stage of humidification. The results showed that the maximum daily productivity is 49.3 kg/day. The optimum air mass flow rate and water mass ratio to obtain maximum productivity was found to be 0.375 kg/s and 0.6, respectively. Furthermore, the experiments' results showed that two-stage humidification enhanced freshwater productivity by 23.25% than that of the single stage of humidification. Finally, an economical study analysis conducted for the test rig showed the cost per liter to be 0.

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Performance investigation of a novel solar hybrid air conditioning and humidification–dehumidification water desalination system

Cited by 82 publications

References 26 publications

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

Energy‐efficient hybrid A/C and freshwater production system proposed for high latent load spaces

Humidification‐dehumidification water desalination system integrated with multiple evaporators/condensers heat pump unit

Experimental investigation of two‐stage humidification‐dehumidification desalination system integrated with an innovative oxy‐hydrogen ( HHO ) system

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