Multi absorber stand alone liquid desiccant air-conditioning systems for higher performance

Kumar, Ritunesh; Dhar, Purbarun; Jain, Sanjeev; Asati, Arun Kumar

doi:10.1016/j.solener.2008.11.010

Cited by 42 publications

(6 citation statements)

References 19 publications

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“…Martinez [20] suggested innovative idea to reduce the corrosion problem with use of organic absorbents instead of tri-ethylene glycol (TEG). In Taiwan [21][22][23] carried out a parametric study on a 9 m long solar C/R and investigated that the double-glazed forced convection well suitable in humid climates. These systems have several advantages over solid desiccants, including lower pressure drop of air across the desiccant material, suitability for dust removal by filtration, ease of manipulation and greater mobility.…”

Section: Literature Survey On Liquid Desiccant Assisted Dehumidificatmentioning

confidence: 99%

Application of Liquid Desiccant Cooling Technology in Built Environment: A Review

2020

International Journal of Modern Studies in Mechanical Engineeri

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The role of the desiccant used in the dehumidifier is to remove water vapor from the conditioned air due to vapor pressure difference between the hot desiccant and the supply conditioned air. The desiccant can be categorized mainly into the two categories as solid adsorption and liquid absorbent desiccant materials. Several other types of solid materials are available in nature that can hold water vapor to the great extent to its weight, e.g., silica, polymers, zeolites, alumina and mixtures. Other commonly used liquid desiccant materials are calcium chloride, lithium chloride, lithium bromide, triethylene glycol and an equal mixture between calcium chloride and lithium chloride. These liquid desiccants have many thermo-physical properties, but their requirements cannot be fully described by any single desiccant. These requirements include low vapor pressure, low crystallization point, high density, low viscosity, low reactivation temperature, and economy [1]. The moist air is dehumidified by being brought into contact with strong liquid or solid desiccant, after this to provide sensible cooling to dehumidification process, traditional vapor compression, and vapor absorption, direct or indirect evaporative cooler units used. When the solution is weakened by absorption of moisture, it provided for the regeneration process that can loses its moisture content due to external thermal source. This called as reactivating the saturated desiccant material [2]. Thermal energy, at a temperature as low as 46-72°C required for reactivating of the liquid desiccant can efficiently obtained using a particular type of air or water solar collector or other primary heat renewable source [3]. The typical cycle of the desiccant is made up by three processes as shown in Figure 1and Figure 2 depicts the fundamental deviation among traditionally used air conditioner and novel desiccant assisted dehumidification and cooling process [4]. The traditionally used vapor-compression cycle is now the foundation of the world air conditioning industry and will remain so for many years in conjunction with other hybrid cooling systems. The following problems are being addressed through a number of approaches including: (1) More efficient designs for household and commercial air conditioners, (2) More efficient buildings that require minimum or zero cooling, (3) The conversion Abstract: Liquid-desiccant assisted dehumidification and cooling system has been proved to be an effective method to extract the moisture of air with relatively less energy consumption, especially compared with conventional vapor compression system. To date, the conventional dehumidification mode with desiccant solution has been improved or replaced by newly emerged energy-saving systems with better performance. This paper gives a detailed account of the general features of the various components used in desiccant dehumidification and cooling techniques; meanwhile, the effect of various operating parameters on system performance also highlighted. Moreover, a summary of the ex...

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Section: Literature Survey On Liquid Desiccant Assisted Dehumidificatmentioning

confidence: 99%

Application of Liquid Desiccant Cooling Technology in Built Environment: A Review

2020

International Journal of Modern Studies in Mechanical Engineeri

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“…Một giải pháp là cho không khí đi qua màng xốp cực nhỏ (micro-porous membrane)để hạn chế việc chất hút ẩm bị cuốn theo [13]. Kumar và công sự [14] đề xuất sử dụng hai vòng tuần hoàn chất hút ẩm lỏng riêng lẻ, mỗi vòng tuần hoàn sử dụng nhiều bộ hấp thụ dựa trên thiết kế màng rơi (falling film based absorbers). Đề xuất này không những hạn chế việc chất hút ẩm bị cuốn vào hệ thống đồng thời còn giúp tăng hệ số COP của hệ thống nói chung.…”

Section: Tổng Quanunclassified

A numerable and experimental study of evaporative cooling systems using liquid desiccants

Bao

2017

Sci. Tech. Dev. J.

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The paper presents a numerable and experimental study of evaporative cooling systems using liquid desiccants, especially focusing on two mains equipment of the systems including the dehumidifier and regenerator. A simulation program for evaporative cooling systems using liquid desiccants has been written based on the numerable study of this research. The results of the numerable and experimental study are very comparative, proving that the simulation program can be used to simulate the evaporative cooling systems using liquid desiccants in order to analyze the feasibility of these systems in Vietnam for energy conservation purposes.

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“…The advantage for using the falling film absorber as a removal device is the lower pressure drop. For example, Kumar et al [18] used the TEG solution as a working solution in the falling film absorber to absorb water vapor from air to discuss the performance of a hybrid liquid desiccant system. Recently, Zhou and Zhang [19] used the limestone slurry to remove sulfur dioxide in a falling film absorber to discuss the removal efficiency affected by the pH value and the SO 2 concentration.…”

Section: Introductionmentioning

confidence: 99%

Effects of Vapor Pressure of Desiccant Solution on Mass Transfer Performance for a Spray-Bed Absorber

Chung

2021

Processes

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The depression in vapor pressure caused by adding desiccant to liquid water can be regarded as the driving force for the dehumidification process. The vapor pressure depends on the temperature and the concentration. Therefore, the purpose in this study is to discuss the mass transfer performance affected by operating variables and to show that the vapor pressure is a key factor affecting the mass transfer performance for absorbing water vapor by triethylene glycol (TEG) solution. The experimental results showed that the mass transfer coefficients were decreased with increases in the temperature and increased with increases in the concentration, respectively, while the mass transfer coefficients were increased with increases in the vapor pressure depression. Although both the average error is within 5% among the mass transfer correlation involving the vapor pressure and that involving the temperature and the concentration in predicting the mass transfer coefficient, there are just two terms, those are vapor pressure and fluid flow rate, associated with operating variables used in the mass transfer correlation. The depression in vapor pressure was not only proved to be the driving force for absorbing water vapor by a desiccant solution, but also a key factor affecting the mass transfer performance.

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Multi absorber stand alone liquid desiccant air-conditioning systems for higher performance

Cited by 42 publications

References 19 publications

Application of Liquid Desiccant Cooling Technology in Built Environment: A Review

Application of Liquid Desiccant Cooling Technology in Built Environment: A Review

A numerable and experimental study of evaporative cooling systems using liquid desiccants

Effects of Vapor Pressure of Desiccant Solution on Mass Transfer Performance for a Spray-Bed Absorber

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