Reconciling thermal performance and power-saving performance of counter-flow spray heating towers

Cui, Haijiao; Ye, Bicui; Wang, Li; Li, Nianping; Xing, Daoming

doi:10.1016/j.egyr.2021.03.006

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…(8) Step 7 was repeated until all the testing points were recorded. (9) After the vapor pressure measurements of one sample, the mixture was discharged by opening the three-way ball valve (6), injection valve (1-b), and layout valve (1-f) and connecting a small air pump with the sample injector (5).…”

Section: Methodsmentioning

confidence: 99%

“…4 As an emerging technology, FFASHPs draw inspiration from the solutions used in the aforementioned mature fields while also considering the antifreezing and energy and mass transport requirements necessary for this new application. Therefore, different liquid desiccants (LiCl 5 and CaCl 2 6 ), absorbents (LiBr 7 ), antifreezes, and secondary refrigerants (ethylene glycol, 8 glycerol, 9 and triethylene glycol 10 ) have been adopted for FFASHPs.…”

Section: Introductionmentioning

confidence: 99%

“…17 The experiments and models discussed in the previous paragraphs were designed to provide fundamental data for dehumidification and absorption systems operating in the temperature range of 293 to 373 K. However, for FFASHPs, which operate in the range of 253 to 273 K, there is a lack of vapor pressure data in this temperature range. Previous studies on FFASHPs have relied on extrapolation using Antoine equations and custom equations developed for other temperature ranges to calculate the vapor pressure of solutions at 253 to 273 K. 6,18 Nevertheless, the accuracy of these fitting formulas outside their original range of application remains to be verified. Organic solutions (e.g., ethylene glycol, glycerol, and triethylene glycol) are a popular choice for FFASHPs due to their lower corrosiveness and cost-effectiveness compared to aqueous LiCl and aqueous LiBr.…”

Section: Introductionmentioning

confidence: 99%

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Vapor Pressure of Aqueous Solutions of Ethylene Glycol, Glycerol, and Triethylene Glycol as Working Fluids of Frost-Free Air-Source Heat Pumps at 253 to 323 K

Huang

Wang

et al. 2023

J. Chem. Eng. Data

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Organic solutions are commonly used in frost-free air-source heat pumps (FFASHPs) due to their lower corrosiveness and cost-effectiveness. However, there is a shortage of vapor pressure data for organic solutions, which is crucial for their application in FFASHPs, particularly at subzero temperatures. This paper developed an apparatus with low leakage and good insulation for measuring vapor pressure using the static method and proposed experimental procedures that included zero setting, cleaning, drying, leak hunting, rinsing, multiple degassing, recording, and remeasuring of discharged solutions. The reliability and accuracy of the apparatus and procedures were verified by comparing experimental data with standard data of distilled water from 278 to 323 K and pure n-heptane from 253 to 303 K. The equilibrium vapor pressures of three organic solutions, namely, aqueous solutions of ethylene glycol, glycerol, and triethylene glycol, commonly utilized in FFASHPs, were measured in a temperature range of 253 to 323 K and a concentration range of 0 to 54.5 wt %. A total of 199 data points were obtained, ranging from 0.0858 to 12.3990 kPa, and fitted using modified Antoine equations, with temperature and concentration serving as independent factors. The mean absolute relative deviations between the experimental and calculated data were determined to be 1.48, 2.35, and 2.13% for aqueous solutions of ethylene glycol, glycerol, and triethylene glycol, respectively. The study’s findings provide crucial data and equations for the three organic solutions employed in FFASHPs.

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Section: Methodsmentioning

confidence: 99%