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Modular sorption thermal cell for solar cooling and heating energy storage

Lookup NU author(s): Dr Long Jiang, Dr Yiji LuORCiD, Professor Tony Roskilly


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Thermal energy storage (TES) is one of the key technologies for industrial waste heat recovery. The development of TES technology is becoming an urgent issue to overcome the drawbacks of time discrepancy, distance discrepancy and instability of solar energy by adjusting mismatch between energy supply and demand. Sorption thermal energy storage technology has been considered as prospective solution for long term or seasonal TES. Based on sorption thermal energy storage, an innovative modular resorption thermal cell is presented and analysed for cold and heat cogeneration. Different composite sorbents are developed with expanded natural graphite treated with sulfuric acid. Sorption characteristics of the composite sorbents are investigated with regard to different mass ratios of salt. Under different working conditions, MnCl2-CaCl2-NH3 shows the best sorption performance. Sorption quantities of different working pairs range from 0.169 kg·kg-1 to 0.499 kg·kg-1. Based on testing results, energy density and power density of modular resorption thermal cell are compared with that of modular sorption thermal cell. Results indicate that for different working pairs, heat density ranges from 580 kJ·kg-1 to 1368 kJ·kg-1 whereas cold density ranges from 400 kJ·kg-1 to 1134 kJ·kg-1. Simultaneously, heat and cold power density range from 322 W·kg-1 to 1502 W·kg-1 and from 222 W·kg-1 to 946 W·kg-1, respectively. Both sorption and resorption thermal cell have their own advantages, which are flexible connected for scaling applications.

Publication metadata

Author(s): Jiang L, Lu YJ, Roskilly AP, Wang RZ, Wang LW

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 4th Sustainable Thermal Energy Management International Conference

Year of Conference: 2017

Print publication date: 28/06/2017

Acceptance date: 15/05/2017