, Volume 25, Issue 8, pp 1663–1672 | Cite as

Activated carbon–carbon dioxide based two stage adsorption compression Brayton cycle power generation

  • Kandadai SrinivasanEmail author
  • Pradip Dutta


Enhancement of energy delivery of a carbon dioxide (CO2) Brayton cycle without compression work liability is achievable using low grade heat for thermal compression. The limitation of the expansion ratios of a single stage adsorption thermal compression is obviated by opting for pressure build up in two stages. Despite the use of a large number of adsorbers, it is shown that, specific work output can be augmented substantially with no undue penalty on the overall cycle efficiency albeit with a marginal shortfall in work output per unit mass of adsorbent. These features are elucidated through an activated carbon based thermal compression of CO2 yet limiting high side pressures to 80 bar and the principal heat source at a temperature equal to or less than 300 °C in tandem with another low grade source at 100 °C for thermal compression. The net outcome is a substantial reduction in the size of the power block and heat exchangers resulting from enhancement of the expansion ratio and reduction in the mass flow rate in the circuit.


Brayton cycle Thermal compression Adsorption Carbon dioxide 



Uptake (kg of CO2/kg of activated carbon)


Physical exergy (kJ)


Enthalpy (kJ/kg)


Isosteric heat of adsorption (kJ/kg of CO2 adsorbed)


Mass (kg)

Mass flow rate (kg/s)


Power (kW)


Pressure bar


Heat (kJ)


Entropy (kJ/kg K)


Temperature (°C or K)


Specific work (kJ/kg of CO2)


Specific work (kJ/kg of adsorbent)




Density (kg/m3)


Time (s)



States on Brayton cycle

A–d, A–D, a′, c′, A′, C′

States on thermal compression cycle


Activated carbon






Upper stage


Lower grade


Higher grade




Lower stage







This paper is based on work supported in part under the US-India Partnership to Advance Clean Energy-Research (PACE-R) for the Solar Energy Research Institute for India and the United States (SERIIUS), funded jointly by the U.S. Department of Energy under Subcontract DE-AC36-08GO28308 to the National Renewable Energy Laboratory and the Government of India, through the Department of Science and Technology under Subcontract IUSSTF/JCERDC-SERIIUS/2012.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Authors and Affiliations

  1. 1.Interdisciplinary Centre for Energy ResearchIndian Institute of ScienceBengaluruIndia
  2. 2.School of Mechanical and Chemical EngineeringUniversity of Western AustraliaCrawleyAustralia
  3. 3.Department of Mechanical EngineeringIndian Institute of ScienceBengaluruIndia

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