Twin screw oil-free wet compressor for compression–absorption cycle

Ferreira, C.A. Infante; Zamfirescu, Calin; Zaytsev, Dmitry

doi:10.1016/j.ijrefrig.2005.10.006

Cited by 34 publications

(8 citation statements)

References 9 publications

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“…The feasibility of reducing the required minimum superheating depends on the equipment and can be enabled by different approaches. Comprehensive studies of compression equipment, which is capable of handling liquid during compression, was conducted by Ferreira [34]. Another measure to enable operation without superheating within the evaporator is the utilization of an internal heat exchanger.…”

Section: Discussionmentioning

confidence: 99%

Analysis of temperature glide matching of heat pumps with zeotropic working fluid mixtures for different temperature glides

Zühlsdorf

Jensen

Cignitti

et al. 2018

Energy

102

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Section: Discussionmentioning

confidence: 99%

Analysis of temperature glide matching of heat pumps with zeotropic working fluid mixtures for different temperature glides

Zühlsdorf

Jensen

Cignitti

et al. 2018

Energy

102

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“…The injection can take place at various compression grades (point of injection) and allows to provide different functions such as sealing, lubrication and lowering the vapor temperature during compression [63]. The point of injection and amount of the injected liquid is a matter of optimization [64]. If all the liquid is carried along with the vapor, it is defined as wet compression [34].…”

Section: Compressor Solutionsmentioning

confidence: 99%

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

et al. 2021

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Decarbonization of the industrial sector is one of the most important keys to reducing global warming. Energy demands and associated emissions in the industrial sector are continuously increasing. The utilization of high temperature heat pumps (HTHPs) operating with natural fluids presents an environmentally friendly solution with great potential to increase energy efficiency and reduce emissions in industrial processes. Ammonia-water absorption–compression heat pumps (ACHPs) combine the technologies of an absorption and vapor compression heat pump using a zeotropic mixture of ammonia and water as working fluid. The given characteristics, such as the ability to achieve high sink temperatures with comparably large temperature lifts and high coefficient of performance (COP) make the ACHP interesting for utilization in various industrial high temperature applications. This work reviews the state of technology and identifies existing challenges based on conducted experimental investigations. In this context, 23 references with capacities ranging from 1.4 kW to 4500 kW are evaluated, achieving sink outlet temperatures from 45 °C to 115 °C and COPs from 1.4 to 11.3. Existing challenges are identified for the compressor concerning discharge temperature and lubrication, for the absorber and desorber design for operation and liquid–vapor mixing and distribution and the choice of solution pump. Recent developments and promising solutions are then highlighted and presented in a comprehensive overview. Finally, future trends for further studies are discussed. The purpose of this study is to serve as a starting point for further research by connecting theoretical approaches, possible solutions and experimental results as a resource for further developments of ammonia-water ACHP systems at high temperature operation.

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“…In order to improve the performance of compressors in hybrid systems, Infante Ferreira et al (2006) evaluated the performance of a twin screw oil free wet compressor. Using both theoretical and experimental analysis, they reported on the performance impact of liquid injection process into the compressor.…”

Section: The Hybrid Systemsmentioning

confidence: 99%

Review of vapour compression heat pumps for high temperature heating using natural working fluids

Bamigbetan

Eikevik

Nekså

et al. 2017

International Journal of Refrigeration

147

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Twin screw oil-free wet compressor for compression–absorption cycle

Cited by 34 publications

References 9 publications

Analysis of temperature glide matching of heat pumps with zeotropic working fluid mixtures for different temperature glides

Analysis of temperature glide matching of heat pumps with zeotropic working fluid mixtures for different temperature glides

Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

Review of vapour compression heat pumps for high temperature heating using natural working fluids

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