A comprehensive review of liquid desiccant air conditioning system

Gurubalan, A.; Maiya, M.P.; Geoghegan, Patrick

doi:10.1016/j.apenergy.2019.113673

Cited by 113 publications

(38 citation statements)

References 84 publications

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“…Different studies have been carried out on LDACs and they are found to have deepened the understanding of the LDACs' potential, limitation, and parametric correlations. [25][26][27][28] To justify any discrepancies between analytical, numerical, and experimental investigation outcomes, Bai et al 29 comparatively revised allowable errors between experimental investigations and the analytical results using data in published literature. Also, the empirical correlations from different researchers toward performance influential parameters of LDACs were reviewed by Wen et al 27 Gómez et al 30 distinguished between direct and indirect solar thermal regenerator in LDACs, where potassium formate and IL were tested in a solar thermal desiccant regeneration equipment.…”

Section: Introductionmentioning

confidence: 99%

“…Although, the aim of the study was to leverage on the hygroscopic and non‐corrosive properties of ILs, the work did not consider the account of high viscosity, toxicity, and non‐biodegradability tendency of ILs. Different studies have been carried out on LDACs and they are found to have deepened the understanding of the LDACs' potential, limitation, and parametric correlations 25‐28 . To justify any discrepancies between analytical, numerical, and experimental investigation outcomes, Bai et al 29 comparatively revised allowable errors between experimental investigations and the analytical results using data in published literature.…”

Section: Introductionmentioning

confidence: 99%

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Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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Liquid desiccant air dehumidification has gained substantial attention recently due to its attractive energy-saving capability, high moisture retention, and low regeneration temperature. However, there are still unresolved limitations in liquid desiccant air conditioning systems (LDACs). Among on-going studies are the search for greener desiccant solvents, high-performance membrane, and regeneration techniques hybridization. This review discusses up-to-date development of the performance influential components of LDACs, such as desiccant properties, regeneration techniques, membranes, energy sources, and hybrid system configurations. The corrosive nature of conventional halide salt solutions, non-biodegradability and high viscosity property of most ionic liquids necessitate the search for alternative solvents in LDACs. Deep eutectic solvents (DES) properties, such as non-corrosive, hygroscopic, biodegradable, and low viscosity idealize promising alternative desiccant solutions. Therefore, DES may be usefully explored and further investigated in LDACs to establish the degree of their capacities in replacing conventional desiccants. Non-thermal regeneration techniques and nanoparticle enhanced membranes were also found to improve the overall energy performance of the LDAC system. Nonthermal regeneration techniques can operate below 40 C and reduce energy utilization between 10% and 50% in indoor space cooling. The coefficient of performance (COP) of this regeneration category is capable of being as high as 6, which is an indication of its promising energy-saving propensity. Highlights• Review on liquid desiccant materials and the potential of deep eutectic solvents as bio-desiccants for air dehumidification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

2021

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“…Modern life would be unthinkable without refrigeration. Global energy consumption is expected to increase by 50% between 2010 and 2040 [1], while the refrigeration system is projected to consume approximately 30% of global electric energy by 2050 [2]. The refrigeration system requires energy input to create cooling by removing heat from a low-temperature reservoir.…”

Section: Introductionmentioning

confidence: 99%

Parametric Optimization of a Two Stage Vapor Compression Refrigeration System by Comparative Evolutionary Techniques

Mahadzir

Ahmed

2021

E3S Web Conf.

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Multistage refrigeration system plays a vital role in industrial refrigeration for the chemical, petrochemical, pharmaceuticals and food industries. Modern chemical industries are complex, and the problems are commonly multi-dimensional, non-linear and time-consuming. This study presents the application of evolutionary computation techniques, namely PSO (particle swarm optimization), GA (Genetic Algorithm) and SA (Simulated Annealing) to solve a design problem of a two-stage vapor compression refrigeration system. Two objectives are evaluated, namely the minimization of total energy consumption and maximization of the coefficient of performance (COP) of the system. The basis of design for the two-stage refrigeration system is built from and validated against data from published literature. The mass flow ratio, evaporator and condenser temperature, parameters for subcooling and desuperheating, and the coefficient of performance for the basis of design show acceptable results. The errors are below 5% against the data from published literature, which are within errors of significant figures in the calculations. In this work, the optimum solutions show a reduction of the required amount of energy consumption by 30.8% and an increase of the COP by nearly 77% with respect to the basis of design. Further improvements are made to the optimization procedures to prevent early convergence and to increase the search efficiency for finding the global optima. The findings by PSO, GA and SA are in agreement, and all evolutionary techniques achieved proper convergence of the two objective functions. It is also found that PSO requires lower computational effort, less computation time and is also easier to implement compared to GA and SA.

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“…Moreover, it is estimated that about 20% to 40% of the total energy use for air conditioning results from the dehumidification process of ventilation air [14]. Compared with the conventional condensation dehumidification, the liquid desiccant-based air conditioning systems provide an alternative approach to remove the moisture from ventilation air with promising energy performance [15]. Meanwhile, there exists a passive approach by integrating the ventilation system with a building envelope to reduce the energy demand of building ventilation, such as dynamic insulation (also known as the breathing wall) [16] and the supply-air window [17].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Earth-to-Air Heat Exchanger to Pre-Cool/Heat Ventilation Air and Its Annual Energy Performance Evaluation: A Case Study

et al. 2020

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An earth-to-air heat exchanger (EAHE) system utilizes the low-grade thermal energy of underground soil to warm up and cool down the flowing air within an underground buried pipe. Integrating the EAHE system with building ventilation can reduce the energy demand for conditioning ventilation air. The main purposes of this paper are to estimate the year-round energy-saving potential of the EAHE-assisted building ventilation system and provide its design guidelines in a hot-summer and cold-winter climate. A steady-state heat transfer model was proposed to calculate the outlet air temperature of an EAHE and further identify its ability to preheat and precool ventilation air. Influences of depth, length, and diameter of a buried pipe on the year-round thermal performance of the EAHE system were evaluated. The results show that considering the compromise between thermal performance and construction costs of the EAHE system, a depth of 5 m and a length of 80 m are recommended. The EAHE system can provide a mean daily cooling and heating capacity of 19.6 kWh and 19.3 kWh, respectively. Moreover, the utilization of the EAHE system can reduce by 16.0% and 50.1% the energy demand for cooling and heating ventilation air throughout the whole year.

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A comprehensive review of liquid desiccant air conditioning system

Cited by 113 publications

References 84 publications

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

Desiccant solutions, membrane technologies, and regeneration techniques in liquid desiccant air conditioning system

Parametric Optimization of a Two Stage Vapor Compression Refrigeration System by Comparative Evolutionary Techniques

Utilization of Earth-to-Air Heat Exchanger to Pre-Cool/Heat Ventilation Air and Its Annual Energy Performance Evaluation: A Case Study

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