Study on the cycle characteristics of chemical heat storage with different reactor module types for calcium chloride hydration

Takehiro Esaki, Noriyuki Kobayashi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To be able to use a chemical heat pump (CHP) practically, it is necessary for the reactor and heat exchanger to perform well. Herein, we examine the heat input/output and coefficient of performance (COP) for reactor modules of a CHP under a calcium chloride (CaCl2) hydration reaction. Various reactor modules were investigated, including plate-tube heat exchangers that comprise of reactors with packed beds of different widths, along with expanded graphite and porous nickel (Ni) metal plates. We found that the heat input/output characteristics could be improved by reducing the heat and mass transfer resistances in the packed-bed reactor. During the heat release, when the reactor and evaporator pressures were the same, the heat transfer rate had a higher impact on the heat output than the water transfer rate. On the contrary, the water transfer rate had a higher impact on the heat input than the heat transfer rate, when the reactor and condenser pressures were the same during heat storage. Furthermore, a COP of 0.43 was achieved for chemical heat storage, at the required temperature, using a plate exchanger with a porous Ni metal plate. Conclusively, a preferred reactor module is one that demonstrates high heat input/output and COP, so that the heat and mass transfer rates can be improved to enable the hydration of large quantities of CaCl2.

Original languageEnglish
Article number114988
JournalApplied Thermal Engineering
Volume171
DOIs
Publication statusPublished - May 5 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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