A comparison of three adsorption equations and sensitivity study of parameter uncertainty effects on adsorption refrigeration thermal performance estimation

Zhao, Yongling; Hu, Eric; Blazewicz, Antoni

doi:10.1007/s00231-011-0875-8

Cited by 10 publications

(6 citation statements)

References 19 publications

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“…The similarity of the small value of the exponent, n, on the other hand suggests both carbons are highly activated as they have broad pore size distributions. 25 Comparing the results obtained here with those of Zhao et al 13 reveals significant differences. The maximum adsorbate capacities (x 0 ) obtained for the 207EA and WS-480 activated carbons in their work were a fraction of that obtained here (85 % and 55 %, respectively).…”

Section: Journal Of Chemical and Engineering Datasupporting

confidence: 45%

“…5−15 Few have addressed adsorption isotherms of the activated carbon/methanol pair, and the heat of adsorption data are scarce. 8,13,14 In this paper, we report multiple temperature methanol adsorption isotherms and their resulting isosteric heats of adsorption for two different commercial activated carbons: a granular activated carbon, 207EA, and a pelleted activated carbon, WS480. Although these carbons are used primarily for water treatment and volatile organic compound capture, respectively, 16 each is also readily available and relatively inexpensive.…”

Section: Introductionmentioning

confidence: 99%

“…This system also has the advantage that methanol has a freezing point below that of water and, thus, systems based on it can be used to make ice . Extensive experimental studies have already been made to determine the efficacy of adsorption cooling systems using different combinations of adsorbent/adsorbate working pairs. − Few have addressed adsorption isotherms of the activated carbon/methanol pair, and the heat of adsorption data are scarce. ,, …”

Section: Introductionmentioning

confidence: 99%

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Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions

Madani

Biggs

et al. 2015

J. Chem. Eng. Data

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This paper presents adsorption isotherms and isosteric heats of adsorption for methanol vapor adsorption for two commercially available activated carbon samples207EA granules and WS-480 pellets (Calgon Carbon, U.S.A.)which were also fully characterized using nitrogen sorption at 77 K. The heat of adsorption of methanol as a function of loading was determined using the Clausius−Clapeyron approach with isotherms obtained at 5°C, 15°C, and 25°C. The isosteric heats of adsorption increased sharply at the small coverage due to increasing effect of condensation heat with coverage. The heat reached a maximum and then varies little with loading, with the average values at around 46.6 kJ/mol for 207EA and 45.1 kJ/mol for WS-480. The higher heats of adsorption for the former activated carbon reflect its more microporous nature (around 78 % compare to 62 % for WS-480 activated carbon). The heat of adsorption data is also comparable to that obtained elsewhere for other activated carbons.

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Section: Journal Of Chemical and Engineering Datasupporting

confidence: 45%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions

Madani

Biggs

et al. 2015

J. Chem. Eng. Data

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“…Summary of solar driven adsorption cycles for cooling application. -0.50612 x 10 -3 K -2 β 3 0.5329 x 10 -6 K -3 ACF-ethanol pair [5] x 0 0.797 kg ethanol/kg ACF D 1.716x10 -6 K -2 AC-methanol pair [28] x 0 0.28 kg/kg D 8.45x10 -7 K -2 n 2.08…”

Section: Discussionmentioning

confidence: 99%

Study of various adsorbent–refrigerant pairs for the application of solar driven adsorption cooling in tropical climates

Habib

Saha

Koyama

2014

Applied Thermal Engineering

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This article presents analytical investigation results on the performance of solar powered adsorption cooling systems for Malaysia and similar tropical regions. The studied adsorbentrefrigerant pairs are silica gel-water, activated carbon fiber-ethanol and activated carbonmethanol. A computer simulation program has been developed for modeling and performance evaluation for the solar driven adsorption cooling cycle using the meteorological data of Kuala Lumpur, Malaysia The simulation is based on the experimentally confirmed adsorption isotherms, kinetics and isosteric heat of the adsorption data for the respective adsorbentrefrigerant pairs. The optimum cooling capacity and coefficient of performance (COP) of the different adsorbent-refrigerant pairs varying adsorption-desorption cycle time, regeneration temperature and chilled water inlet temperature are calculated and compared.

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“…The temperature at state 1 (T 1 ) is the ambient temperature at the beginning of a heating process. The concentration at state 1 ( x 1 ) can be calculated from Dubinin-Astakov (D-A) equation, which can be written as [21,22]:…”

Section: Isosteric Heating (Or Re-heating) Processmentioning

confidence: 99%

Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles

Blazewicz

et al. 2020

Heat Mass Transfer

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When simulating a daily performance of a solar thermal powered adsorption refrigeration system, daily weather data (i.e. daily maximum and minimum ambient temperatures and daily total solar radiation) are normally used to simulate a 24-h refrigeration cycle. However, the simulation obtained in this way is not that accurate, due to which could not reflect real hourly processes during the daytime. In present study, hourly weather data, especially during the isosteric and desorption processes in the sunshine duration, has been utilised to simulate hourly accumulated daily cycles. Seven possible cycles, depending on hourly weather change patterns, have been identified in this study. It has been found that the desorption process is not necessarily an isobar process as previous studies assumed, which depends on real hourly weather changes. Therefore, an improved mathematical model has been developed and validated. It has been found that the accuracy of the simulation with hourly weather data has been improved by up to 5%, compared to that of the model using daily weather data. The simulated error in one-day performance would be accumulated if a long-time performance of such a system was required to be simulated. Therefore, a case-study is conducted to demonstrate the difference between the two models when simulating a daily performance under three typical weather conditions.

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A comparison of three adsorption equations and sensitivity study of parameter uncertainty effects on adsorption refrigeration thermal performance estimation

Cited by 10 publications

References 19 publications

Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions

Characterizations of Activated Carbon–Methanol Adsorption Pair Including the Heat of Adsorptions

Study of various adsorbent–refrigerant pairs for the application of solar driven adsorption cooling in tropical climates

Investigation on the long-term performance of solar thermal powered adsorption refrigeration system based on hourly accumulated daily cycles

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