Skip to main content

Advertisement

SpringerLink
Log in

Evaluation of adsorbent materials for heat pump and thermal energy storage applications in open systems

  • Published:
Adsorption Aims and scope Submit manuscript

Abstract

The evaluation of solid adsorbents in open sorption systems for heating, cooling and thermal energy storage (TES) applications is crucial for the ecological and economical performance of these systems. An appropriate adsorbent has to reach the temperature limit given by the heating/cooling system of the consumer. It has to provide high energy efficiency and a high energy density for storage applications. A method for an easy evaluation of different adsorbents for a specific application has been developed. The method is based on the adsorption equilibrium of the adsorbent and water vapor. The crucial property for the discussed field of applications is the differential heat of adsorption. Criteria for the evaluation of the adsorbent are the breakthrough curves (responsible for the dynamics of the process), the possible temperature lift (or the dehumidification) of the air, the thermal COP and the storage capacity.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

Q des :

desorption energy, kJ

Q cond :

condensation energy, kJ

Q ads :

adsorption energy, kJ

Q evap :

evaporation energy, kJ

ΔH d :

differential heat of adsorption, kJ/kg(adsorptive)

ΔH ads :

integral heat of adsorption, kJ/kg(adsorbent)

T in :

air temperature at inlet, °C

T out :

air temperature at outlet, °C

x in :

water content per mass of dry air, at inlet, g/kg

x out :

water content per mass of dry air, at outlet, g/kg

C ads :

water content of adsorbent, after adsorption, kg/kg

C des :

water content of adsorbent, after desorption, kg/kg

c p,air :

specific heat capacity of air, kJ/(kg⋅K)

c p,sorb :

specific heat capacity of dry adsorbent, kJ/(kg⋅K)

c p,H2O :

specific heat capacity of air, kJ/(kg⋅K)

ΔF :

change in free energy upon adsorption, kJ

ΔS :

change in entropy upon adsorption, kJ/K

L(T):

heat of evaporation of water, kJ/kg

ρ Q :

energy storage density of adsorbent, MJ/m3

m sorb :

adsorbent mass, kg

V sorb :

adsorbent volume, m3

COPth :

coefficient of performance (theoretical), –

COPuseable :

coefficient of performance (application conditions), –

References

  • Ahlefeld, G., Maier-Laxhuber, P., Rothmeyer, M.: Thermochemical heat storage and heat transformation with zeolites as adsorbents. In: Millhone, J.P., Willis, E.H. (eds) Proceedings of the IEA Conference on New Energy Conservation Technologies and their Commercialization, vol. 1, pp. 796–819. Springer, Berlin (1981)

    Google Scholar 

  • Bering, B.P., et al.: Theory of volume filling for vapor adsorption. J. Colloid Interface Sci. 21, 378–392 (1966)

    Article  CAS  Google Scholar 

  • Hauer, A.: Adsorption von Wasserdampf an Molekularsieb 13X im Trägergassystem, thesis, physics department, Ludwig-Maximilians-Universität, Munich (1988)

  • Hauer, A.: Beurteilung fester Adsorbentien in offenen Sorptionssytemen für energetische Anwendungen, thesis, Technische Universität Berlin, Fakultät III Prozesswissenschaften, Berlin (2002a)

  • Hauer, A.: Thermal energy storage with zeolite for heating and cooling. In: Proceedings of the 7th International Sorption Heat Pump Conference ISHPC, pp. 385–390, Shanghai, 2002b

  • Hauer, A.: Adsorption systems for thermal energy storage—design and demonstration projects. In: Paksoy H.Ö. (ed.) Thermal Energy Storage for Sustainable Energy Consumption, pp. 409–427. Springer (2007)

  • Hauer, A., Dallmayer, W.: Open gas fired adsorption heat pump for space heating in conjunction with solar collectors. In: Proceedings of the Ab-Sorption Heat Pump Conference, vol. II, pp. 703–708, Montreal, 1996

  • Khelifa, N.: Das Adsorptionspaar Silicagel-Wasserdampf—Anwendung als solares Klimatisierungssystem, thesis, physics department, Ludwig-Maximilians-Universität, Munich (1984)

  • Meunier, F.: Adsorption heat pump technology: possibilities and limits. In: Proceedings of the International Sorption Heat Pump Conference, pp. 25–35, Munich, Germany, March 24–26, 1999

  • Shelton, S.V.: Residential space heating with solid sorption technology. In: Proceedings of the Solid Sorption Refrigeration Symposium, Paris, France, November 18–20, 1992

  • Storch, G., Hauer, A.: Cost-effectiveness of a heat energy distribution system based on mobile storage units: two case studies. In: Proceedings of the ECOSTOCK conference, Stockton, 2006

Download references

Author information

Authors and Affiliations

  1. Bavarian Center for Applied Energy Research (ZAE Bayern), Walther-Meissner-Str. 6, 85748, Garching, Germany

    A. Hauer

Authors
  1. A. Hauer
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to A. Hauer.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Hauer, A. Evaluation of adsorbent materials for heat pump and thermal energy storage applications in open systems. Adsorption 13, 399–405 (2007). https://doi.org/10.1007/s10450-007-9054-0

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10450-007-9054-0

Keywords

Search

Navigation