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Title: Heat exchanger selection and design analyses for metal hydride heat pump systems

This paper presents a design analysis for the development of highly efficient heat exchangers within stationary metal hydride heat pumps. The design constraints and selected performance criteria are applied to three representative heat exchangers. The proposed thermal model can be applied to select the most efficient heat exchanger design and provides outcomes generally valid in a pre-design stage. Heat transfer effectiveness is the principal performance parameter guiding the selection analysis, the results of which appear to be mildly (up to 13%) affected by the specific Nusselt correlation used. The thermo-physical properties of the heat transfer medium and geometrical parameters are varied in the sensitivity analysis, suggesting that the length of independent tubes is the physical parameter that influences the performance of the heat exchangers the most. The practical operative regions for each heat exchanger are identified by finding the conditions over which the heat removal from the solid bed enables a complete and continuous hydriding reaction. The most efficient solution is a design example that achieves the target effectiveness of 95%.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1]
  1. Technical Univ. of Denmark, Kongens-Lyngby (Denmark)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
OSTI Identifier:
1240016
Report Number(s):
SAND2016-0086J
Journal ID: ISSN 0360-3199; 617590
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
International Journal of Hydrogen Energy
Additional Journal Information:
Journal Volume: 41; Journal Issue: 7; Journal ID: ISSN 0360-3199
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION