Dynamic study of steam generation from low-grade waste heat in a zeolite–water adsorption heat pump

Bing Xue, Xiangrui Meng, Xinli Wei, Koichi Nakaso, Jun Fukai

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A novel zeolite–water adsorption heat pump system based on a direct-contact heat exchange method to generate steam from low-grade waste gas and water has been proposed and examined experimentally. Superheated steam (200 °C, 0.1 MPa) is generated from hot water (70–80 °C) and dry air (100–130 °C). A dynamic model for steam generation process is developed to describe local mass and heat transfer. This model features a three-phase calculation and a moving water–gas interface. The calculations are carried out in the zeolite–water and zeolite–gas regions. Model outputs are compared with experimental results for validation. The thermal response inside the reactor and mass of steam generated is well predicted. Numerical results show that preheat process with low-temperature steam is an effective method to achieve local equilibrium quickly, thus generation process is enhanced by prolonging the time and increasing mass of the generated steam. Besides, high-pressure steam generation up to 0.5 MPa is possible from the validated dynamic model. Future work could be emphasized on enhancing high-pressure steam generation with preheat process or mass recovery operation.

Original languageEnglish
Pages (from-to)451-458
Number of pages8
JournalApplied Thermal Engineering
Volume88
DOIs
Publication statusPublished - Sep 5 2015
Externally publishedYes

Keywords

  • Adsorption heat pump
  • Direct-contact heat exchange
  • Preheat process
  • Steam generation
  • Zeolite–water

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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