Experimental study for hybrid humidification–dehumidification water desalination and air conditioning system

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

doi:10.1016/j.desal.2015.01.032

Cited by 89 publications

(30 citation statements)

References 23 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: 57%

“…This may be attributed to the increase of the sensible and latent heat of the air mixture (state M in Figure 2A,B) at the entrance of the cooling coil which leads to the increase of the required cooling coil capacity and the electric power consumptions of the refrigeration unit to attain the required supply air temperature to the conditioned room (see Eqs. (2), (6), (14), and (15)). It was observed that the COP of the proposed system enhances by 92% and 44% compared with that of the basic system at FAR of 0.2 and 1, respectively.…”

Section: Effect Of the Room-sensible Heat Factor On The System Perfmentioning

confidence: 99%

“…In this case, deep cooling process is conducted on the process air using a cooling coil of apparatus dew point above the freezing temperature of the water to avoid water freezing problem on the cooling coil surface. Most of the studies conducted in this topic are directed to study the performance of the cooling and dehumidifying cooling coils . Zhou developed an experimentally validated simple transient model for predicting the coil performance and the states of exit air under the conditions of occurrence of moisture condensation.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the studies conducted in this topic are directed to study the performance of the cooling and dehumidifying cooling coils. [10][11][12][13][14] Zhou 10,11 developed an experimentally validated simple transient model for predicting the coil performance and the states of exit air under the conditions of occurrence of moisture condensation. Zhou et al 12 presented a dynamic model with a correction of the dry fin efficiency to be used in the case of the wet conditions of the cooling and dehumidifying coil to accurately predict the coil performance.…”

Section: Introductionmentioning

confidence: 99%

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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: 57%

Section: Effect Of the Room-sensible Heat Factor On The System Perfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2019

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“…H. Kang et al [28] studied the performance of two stage multi-effect desalination system based on humidification-dehumidification process. Nada et al [29] studied hybrid humidification-dehumidification desalination and air-conditioning system and demonstrated that increasing air mass flow rate and humidity increases refrigeration capacity and fresh water production rate. Solar still desalination technology has several merits such as simple structure, easy maintenance and installation and a few moving components but low still efficiency are one of the major concerns which need further investigation.…”

Section: Introductionmentioning

confidence: 98%

Experimental and analytical study on productivity augmentation of a novel solar humidification–dehumidification (HDH) system

2015

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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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Experimental study for hybrid humidification–dehumidification water desalination and air conditioning system

Cited by 89 publications

References 23 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

Experimental and analytical study on productivity augmentation of a novel solar humidification–dehumidification (HDH) system

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

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