TY - JOUR
T1 - Dynamic study of steam generation from low-grade waste heat in a zeolite–water adsorption heat pump
AU - Xue, Bing
AU - Meng, Xiangrui
AU - Wei, Xinli
AU - Nakaso, Koichi
AU - Fukai, Jun
N1 - Funding Information:
This work was partially supported by the NEDO project under Research and Development Program for Innovative Energy Efficiency Technology and by a grant from Education Department of Henan Province , no. 14A480003 .
Funding Information:
This work was partially supported by the NEDO project under Research and Development Program for Innovative Energy Efficiency Technology and by a grant from Education Department of Henan Province, no. 14A480003.
Publisher Copyright:
© 2014 Elsevier Ltd
PY - 2015/9/5
Y1 - 2015/9/5
N2 - 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.
AB - 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.
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U2 - 10.1016/j.applthermaleng.2014.11.050
DO - 10.1016/j.applthermaleng.2014.11.050
M3 - Article
AN - SCOPUS:84919488015
SN - 1359-4311
VL - 88
SP - 451
EP - 458
JO - Journal of Heat Recovery Systems
JF - Journal of Heat Recovery Systems
ER -