Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Longo, Giovanni Antonio; Gasparella, Andrea

doi:10.1016/j.ijrefrig.2015.10.004

Cited by 28 publications

(6 citation statements)

References 8 publications

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“…Another energy-related application of liquid desiccant solutions is their potential as thermo-chemical storage medium [50,51]. This ability of liquid desiccant solutions will be more accurately described in Section 3.4.…”

Section: Energy Use Of Liquid Desiccant Systemsmentioning

confidence: 99%

“…Less-corrosive and non-volatile desiccants such as salts of weak organic acids of potassium and sodium, e.g. potassium formate (HCO2K), potassium acetate (CH3CO2K), sodium formate (HCO2Na) and sodium acetate (CH3CO2Na) were investigated in these systems [51,52]. The characteristics of HCO2K solutions of low crystallization temperature, low density and viscosity, high solubility, less corrosion to metals, and less toxicity make of this desiccant a very promising candidate for LDAC technology.…”

Section: Liquid Desiccant Characteristicsmentioning

confidence: 99%

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Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Giampieri

Smallbone

et al. 2018

Applied Energy

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In an effort to minimise electricity consumption and greenhouse gases emissions, the heating, ventilation and airconditioning sector has focused its attention on developing alternative solutions to electricallydriven vapour-compression cooling. Liquid desiccant airconditioning systems represent an energyefficient and more environmentally friendly alternative technology for dehumidification and cooling, particularly in those cases with high latent loads to maintain indoor air quality and comfort conditions. This technology is considered particularly efficient in hot and humid climates. As a matter of fact, the choice of the desiccant solution influences the overall performance of the system. The current paper reviews the working principle of liquid desiccant systems, focusing on the thermodynamic properties of the desiccant solutions and describes an evaluation of the reference thermodynamic properties of different desiccant solutions to identify which thermodynamic, physical, transport property influences the liquid desiccant process and to what extent. The comparison of these thermodynamic properties for the commonly used desiccants is conducted to estimate which fluid could perform most favourably in the system. The economic factors and the effect of different applications and climatic conditions on the system performance are also described. The paper is intended to be the first step in the evaluation of alternative desiccant fluids able to overcome the problems related to the use of the common desiccant solutions, such as crystallization and

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Section: Energy Use Of Liquid Desiccant Systemsmentioning

confidence: 99%

Section: Liquid Desiccant Characteristicsmentioning

confidence: 99%

Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Giampieri

Smallbone

et al. 2018

Applied Energy

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“…The H2O/KCOOH solution is environmentally friendly, nontoxic and nonflammable; has an advantageous theoretical heat storage energy density; and costs less than half the price of the couples usually used in absorption processes (LiBr/H2O or LiCl/H2O) (Lefebvre, 2015). Its aqueous solution is also weakly alkaline and therefore noncorrosive and biodegradable (Longo and Gasparella, 2016), and has a lower density and viscosity than absorbents such as lithium bromide (Riffat et al, 1998). These advantages together with its relatively low cost make it a prime choice as the absorbent for the heat storage process.…”

Section: Kcooh/h2o Couple Selectionmentioning

confidence: 99%

Long-term solar heat storage process by absorption with the KCOOH/H2O couple: Experimental investigation

Pierrès

Huaylla

Stutz

et al. 2017

Energy

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This paper presents experimental results obtained with a prototype of a solar heat storage absorption process using the KCOOH/H2O couple. The process principle and the prototype tested are described, and both charging and discharging results are presented and discussed. The parameters influencing the results the most are water and solution flow on the reactor heat exchangers as well as the heat source and sink temperatures. The system's main limitation is the wetting of the exchanger plates. However, the tests prove the interest of the KCOOH/H2O couple in this type of low-temperature heat storage process.

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“…At the same time, the relevant thermophysical properties were investigated so that these systems could be better understood, designed, and run. 4,5 In 2016, Longo and Gasparella reported the thermal conductivity and dynamic viscosity measurements of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 274.15−353.15 K. 6 Later in 2018, Longo and Fedele measured the equilibrium vapor pressure of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 278.15−348.15 K, which is typical for desiccant application. 7 Wen et al made a comprehensive study on the thermal properties of aqueous HCOOK solution, including density, thermal conductivity, dynamic viscosity, heat capacity, and vapor pressure, with concentration varying from 65 to 74% and temperature from 293.15 to 338.15 K. 8 Up to now, most of the studies about aqueous HCOOK solution focused on its application as a desiccant.…”

Section: Introductionmentioning

confidence: 99%

“…Due to its noncorrosion, biodegradability, economy, and its special thermophysical characteristics, aqueous potassium formate solution is regarded as an alternative of desiccant, absorbent, and secondary refrigerant for applications in refrigeration and air conditioning. − During recent years, as the issue of energy saving was paid more and more attention, many new systems that employ aqueous HCOOK solution were proposed. At the same time, the relevant thermophysical properties were investigated so that these systems could be better understood, designed, and run. , In 2016, Longo and Gasparella reported the thermal conductivity and dynamic viscosity measurements of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 274.15–353.15 K . Later in 2018, Longo and Fedele measured the equilibrium vapor pressure of aqueous HCOOK solution with salt concentration varying from 60 to 80% in the temperature range 278.15–348.15 K, which is typical for desiccant application .…”

Section: Introductionmentioning

confidence: 99%

Vapor Pressure of Aqueous HCOOK Solution as Working Fluids of an Absorption Heat Transformer at High Temperature

et al. 2020

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Aqueous potassium formate solution is regarded as a potential working fluid of an absorption heat transformer (AHT) because of its noncorrosive and biodegradable characteristics. The vapor pressure of working fluids is an important property for application in an absorption cycle. However, current experimental data are mostly limited to temperature and concentration ranges that are suitable for a dehumidification system. Thus, more accurate data of vapor pressure are anticipated. In this paper, the equilibrium vapor pressures of aqueous HCOOK solution were measured with a static method in the temperature range from 323.15 to 373.15 K. The mass concentration of HCOOK varied from 10 to 70%. The measured data were compared with the estimated values of a referenced chemical engineering property database (Aspen Plus). A relatively large mean absolute relative deviation (MARD) of 13.27% was found. The data were then correlated with a modified Antoine equation, and the MARD was reduced to 0.45%. The thermodynamic performance of aqueous HCOOK solution for AHT was estimated for a typical cycle.

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Experimental measurement of thermophysical properties of H2O/KCOOH (potassium formate) desiccant

Cited by 28 publications

References 8 publications

Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Thermodynamics and economics of liquid desiccants for heating, ventilation and air-conditioning – An overview

Long-term solar heat storage process by absorption with the KCOOH/H2O couple: Experimental investigation

Vapor Pressure of Aqueous HCOOK Solution as Working Fluids of an Absorption Heat Transformer at High Temperature

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