Adsorption characteristics of the charcoal-nitrogen system at 79–320 K and pressures to 5 MPa

Prasad, Madhu; Akkimardi, B.S.; Rastogi, Shantanu; Rao, Radhika Rani; Srinivasan, Kandadai

doi:10.1016/s0008-6223(96)00082-6

Cited by 22 publications

(21 citation statements)

References 7 publications

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“…These compressors can establish a pressurized gas flow by the cyclic adsorption and desorption of a working gas at a sorber (Prasad et al 1996;Banker et al 2004;Lu et al 2006). These sorption compressors are thermally driven and operate without moving parts; meaning they are highly reliable, long life, and vibration free.…”

Section: Introductionmentioning

confidence: 99%

“…The development of a sorption compressor for any working fluid relies on the adsorption isotherms at wide ranges of temperatures and pressures. These isotherms usually are not available in the literature and the measurements are done by the compressor developer (Prasad et al 1996;Saha et al 2012). In the present work we have performed adsorption measurements of nitrogen, methane, ethane, and propane on three adsorbents: Norit, Chemviron, and Saran.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

2016

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In this paper we present the measured isotherms of nitrogen, methane, ethane, and propane on three carbons: Norit RB2, Chemviron AP 4-60, and highly activated Saran. The measurements are taken at temperatures between 300 and 400 K, in 20 K steps. The measured data is fitted to the Sips adsorption model, where the Sips parameters are determined by a linearization method. The Sips parameters are further adjusted to realize a logic dependence on temperature and the parameter characteristics are discussed. Subsequently, the Sips model is modified to incorporate the temperature dependence. Including the temperature dependence results in a slightly higher error relative to the experimental results (typically 10 % as compared to 6 %). The immediate research product is a convenient expression for every adsorbate-adsorbent system which is discussed in this paper, for calculating the adsorption concentration as a function of temperature and pressure. A more general research product is a better understanding of the Sips parameter characteristics that should help in developing future adsorbents on demand.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

2016

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“…The presence of void volume inside the adsorber cell acts similar to clearance volume in the case of a positive displacement type compressor. As the desorption is carried out using TSA process, uniform heating of the adsorbent is desired for effective operation of the compressor [2,5]. The presence of a temperature gradient across the sorption bed results in poor desorption in the regions of lower temperature and thus leading to higher residual loading of the adsorbent.…”

Section: Operation Of Sorption Compressor Type J-t Cryocoolermentioning

confidence: 99%

Design and development of a four-cell sorption compressor based J-T cooler using R134a as working fluid

Mehta

Bapat²,

Atrey

2014

AIP Conference Proceedings

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Abstract.The need of a cooler with no electromagnetic interference and practically zero vibration has led to sorption compressor based Joule-Thomson (J-T) coolers. These are useful for sophisticated electronic, ground based and space borne systems. In a Sorption compressor, adsorbed gases are desorbed into a confined volume by raising temperature of the sorption bed resulting in an increase in pressure of the liberated gas. In order to have the system (compressor) functioning on a continuous basis, with almost a constant gas flow rate, multiple cells are used with the adaptation of Temperature Swing Adsorption (TSA) process. As the mass of the desorbed gas dictates the compressor throughput, a combination of sorbent material with high adsorption capacity for a chosen gas or gas mixture has to be selected for efficient operation of the compressor. Commercially available (coconut-shell base) activated carbon has been selected for the present application. The characterization study for variation of discharge pressure is used to design the Four-cell sorption compressor based cryocooler with a desired output. Apart from compressor, the system includes a) After cooler b) Return gas heat exchanger c) capillary tube as the J-T expansion device and d) Evaporator.The system is designed for a gas mixture using a number of gaseous components like Nitrogen, Methane, Ethane, Propane, Iso-butane etc to achieve cryogenic temperature. However, as an initial study, the cryocooler is run continuously using Nitrogen and R134a as a single gas to test the system endurance and to detect operational problems. The pressure and temperature variation obtained in the adsorption cell along with the cool-down data is presented in this paper.

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“…The quantity of gas adsorbed can be calculated from the mass balance of buffer chamber, system dead volume as shown in equation (1) and (2) [4][5], where m ad is the mass of the gas adsorbed m buffer is the mass of the gas charged. The following equations are used to calculate the mass of gas adsorbed.…”

Section: Calculation Of Adsorption Capacity and High Pressure Generatedmentioning

confidence: 99%

Characterization of sorption compressor for mixed refrigerant J-T cryocooler

Mehta¹,

Bapat²,

Atrey³

2012

AIP Conference Proceedings

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The requirement of a cryocooler with minimum vibrations for space borne system and highly sophisticated electronic devices for ground application, has led to the development of sorption compressor type J-T cryocooler. The adsorption capacity of any adsorbent material increases with an increase in pressure and decreases with an increase in temperature. In a Sorption compressor, adsorbed gases are desorbed in a confined volume by raising temperature of the sorption bed which results in increase in pressure of gas. A uniform temperature across the sorption bed ensures maximum discharge from the compressor amounting to higher flow rates and longer cycle time on account of reduced residual loading. In addition, it is also very important to determine the adsorption capacity of any material with respect to the gas or gases to be adsorbed as this varies with source of the adsorbent. The present work reports the characterization of a fully operational two-cell sorption compressor developed. The sorption compressor is characterized for discharge pressure variation with cycle time; this is essentially a function of a) the amount of adsorbent, b) the adsorption capacity for respective gas or gases, c) desorption temperature and its uniformity, and d) system dead volume. The present paper analyses these aspects theoretically and the results are compared with the experimental data obtained for individual gases as well as for gas mixtures. The effect of gas distribution on temperature uniformity across the bed and of heater power on high pressure generated is also studied. The paper also discusses the pressure profile obtained for a given amount of adsorbent for different gas or gas mixture. The work, based on the results obtained so far is being further extended for a four cell sorption compressor.

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Adsorption characteristics of the charcoal-nitrogen system at 79–320 K and pressures to 5 MPa

Cited by 22 publications

References 7 publications

Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

Adsorption isotherms and Sips models of nitrogen, methane, ethane, and propane on commercial activated carbons and polyvinylidene chloride

Design and development of a four-cell sorption compressor based J-T cooler using R134a as working fluid

Characterization of sorption compressor for mixed refrigerant J-T cryocooler

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