Study on the improvement of the performance of a novel adsorption heat pump system for generating hightemperature steam

Koichi Nakaso, Shunsuke Kobayashi, Shotaro Eshima, Jun Fukai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Performance of a novel adsorption heat pump system with zeolite-water pair for generating high-temperature steam is investigated. The adsorption heat pump system adopts a direct heat exchange method to overcome the low heat transfer rate between packed bed and heat transfer fluid. As a thermal storage process in the heat pump system, the regeneration of zeolite using dry hot gas is carried out. For a thermal discharge process in the heat pump system, water is introduced to the zeolite packed bed as not only adsorbate but also heat transfer fluid. A direct contact of water and zeolite results in evaporation of excess water due to the release of adsorption heat from zeolite. In the direct heat exchange method, large surface area of zeolite packed bed can be used for the convection heat transfer as well as the reaction. However pressure drop especially for introducing the dry gas would increase. Pressure drop is closely related to the blower load and should be therefore reduced for the practical utilization. In this study, reduction in the pressure drop during the regeneration of zeolite is investigated. An insert made of wire mesh is used to increase the porosity of the zeolite packed bed. As a result, while pressure drop can be reduced, the rate of regeneration of zeolite changes little. This can be attributed to the deviation of air flow by using the inserts. The appropriate conditions to reduce the pressure drop are studied.

Original languageEnglish
Title of host publicationProceedings of the 15th International Heat Transfer Conference, IHTC 2014
PublisherBegell House Inc.
Publication statusPublished - 2014
Externally publishedYes
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: Aug 10 2014Aug 15 2014

Other

Other15th International Heat Transfer Conference, IHTC 2014
CountryJapan
CityKyoto
Period8/10/148/15/14

Keywords

  • Adsorption and desorption
  • Energy conversion and storage
  • Porous media
  • Steam generation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics

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    Nakaso, K., Kobayashi, S., Eshima, S., & Fukai, J. (2014). Study on the improvement of the performance of a novel adsorption heat pump system for generating hightemperature steam. In Proceedings of the 15th International Heat Transfer Conference, IHTC 2014 Begell House Inc..