Experimental optimization of an absorption-compression heat pump with wet compression for large temperature glide industrial applications

Khalid Hamid, Shuai Ren, Ignat Tolstorebrov, Armin Hafner, Uzair Sajjad, Cordin Arpagaus, Ole Marius Moen and Trygve M. Eikevik

Renewable Energy, 2025, vol. 243, issue C

Abstract: The present work demonstrates the experimental optimization of a single-stage compression-absorption heat pump system for an application with a large temperature glide on the heat sink side using wet compression. The primary focus is weak solution injection to optimize the compressor discharge temperature and absorber heat sink temperature glide optimizations and their effect. With constant heat sink and source inlet temperatures at 60 °C and a mass flow rate of 0.25 kg/s, preliminary results show that the system delivers 50 kW of heating load and 26 kW of cooling load, respectively. Increasing the heat sink temperature glide between 28 °C and 48 °C reduces Lorenz COP and improves system efficiency. A weak solution mass flow rate of 0.015–0.25 kg/s with a minimum absorber pressure of 15 bar is recommended to achieve a higher heat sink temperature glide. Increasing the weak solution injection flow rate from 0 to 0.03 kg/s decreases the compressor discharge temperature from 139 °C to 122 °C, with a constant 0.0015 kg/s injection directed to the bearing and shaft seal. The results also highlight differences in the overall heat transfer coefficients and heat flux between absorbers 1 and 2. Absorber 1, operating in bubble mode, performs better with a maximum heat transfer coefficient of 1.39 kW/m2K compared to absorber 2, which operates in falling film mode. The system’s performance and behavior are comprehensively evaluated, providing a foundation for future improvements and advancements in oil-free absorption-compression heat pump technology.

Keywords: High temperature heat pump; Absorption–compression; Oil free twin-screw compressor; NH3/H2O mixture; Osenbrück cycle; Large Temperature Glide (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0960148125001934
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:243:y:2025:i:c:s0960148125001934

DOI: 10.1016/j.renene.2025.122531

Access Statistics for this article

Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides

More articles in Renewable Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().