Ionic liquid-based hybrid absorption cycle for water heating, dehumidification, and cooling

Chugh, Devesh; Gluesenkamp, Kyle; Abdelaziz, Omar; Moghaddam, Saeed

doi:10.1016/j.apenergy.2017.05.161

Ionic liquid-based hybrid absorption cycle for water heating, dehumidification, and cooling

Journal Article · Tue Jun 13 00:00:00 EDT 2017 · Applied Energy

DOI:https://doi.org/10.1016/j.apenergy.2017.05.161· OSTI ID:1513432

Chugh, Devesh ^[1]; ^[2]; ^[2]; Moghaddam, Saeed ^[1]

Univ. of Florida, Gainesville, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Water heating, dehumidification and space cooling are responsible for significant energy consumption in buildings. A potential energy saving measure is to develop hybrid systems that can utilize the sensible and latent heats removed in space cooling to heat water. In this paper, we present experimental results on a hybrid system that utilizes the latent heat released in the dehumidification process for water heating. This system absorbs water vapor from the air and transfers the heat of phase change into the process water. The absorbed water vapor is then liberated in a desorber and subsequently condensed in a condenser, while its latent heat is transferred to the process water. The condensed water vapor can then be either drained (if dehumidification is desired), or utilized in an evaporative cooling process (if sensible space cooling is desired). In essence, the system can exchange both sensible and latent heats with its ambient. The main innovations implemented in the system are (1) a semi-open absorption system architecture to lower the system cost, (2) a membrane-based absorber to alleviate the liquid entrainment issue encountered in the conventional packed bed absorbers and (3) an ionic liquid that eliminates the crystallization risks and minimizes corrosion issues normally associated with LiBr-based absorption systems. Furthermore, a water heating thermal COP of 1.4 is achieved at 30°C, 70% RH ambient conditions.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1513432

Alternate ID(s):: OSTI ID: 1550334

Journal Information:: Applied Energy, Journal Name: Applied Energy Journal Issue: C Vol. 202; ISSN 0306-2619

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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