Ammonia sorption thermal battery with water-loaded sorbent driven by low-temperature heat source

Jae Won Lee, Jong Ha Park, Hyung Won Choi, Yong Tae Kang

Research output: Contribution to journalArticlepeer-review


Sorption thermal batteries are systems that can store heat for a long period without heat loss through the reaction of the gas and adsorbent. However, a sorption thermal battery driven by a heat source of less than 100 ℃ is required because solar and waste heat are low-temperature heat sources. Given that the sorption process in solid sorbents typically requires high charging temperatures, this study investigates the loading of water into the sorbent in combination with ammonia to lower the charging temperature. Zeolite 13X, HZSM-5 and HKUST-1 are evaluated as the potential sorbents based on their material properties, water loading capacity, and ammonia sorption performance. Among them, zeolite 13X loaded with water is selected as the working pair and applied to a laboratory-scale sorption thermal battery to evaluate its energy storage performance. When the charging pressure of ammonia was 5 bar under normal coolant conditions, the energy storage density was 204.2 kWh m−3 and the coefficient of performance was 0.53. It can be operated with a low-temperature heat source of 80 ℃; therefore, renewable heat sources such as solar energy or industrial waste heat, can be used. Then the coefficient of performance increases 6.2 times from 0.53 to 3.31 (with the coolant). The ammonia- sorption thermal battery based on zeolite 13X loaded with water is expected to play an important role in thermal energy storage to solve the imbalance problem between demand and supply of renewable energy.

Original languageEnglish
Article number117653
JournalEnergy Conversion and Management
Publication statusPublished - 2023 Nov 1

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd


  • Energy storage density
  • HO loading
  • NH
  • Sorption thermal battery
  • zeolite 13X

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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