Development of a Semi-Physical Model for Screw Compressors for Optimal High-Temperature Heat Pump Design

DOI: 10.18462/iir.compr.2024.0615

Sekcia: Rotary, scroll, screw, ... compressors I

Stav prijatia: Abstrakt prijatý

Autori

Abstrakt

Efficient decarbonisation of industrial processes requires efficient replacing technologies such as high-temperature heat pumps. In particular, the keys to designing heat pumps with high efficiencies are the optimal refrigerant choice and high compressor efficiencies within the entire operating envelope. The determination of the optimal system design is complex due to the large number of potential refrigerants and compressor types. To capture the complexity, model-based design methods are suitable. Thus, process models are required. In early design stages, s emi-physical process models are promising since they require less knowledge of the compression process than physical models yet less process data than black box models. While semi-physical models already exist for piston compressors, there is no semi-physical model of a screw compressor in the literature to the best of the author’s knowledge.

This paper presents a semi-physical screw compressor model. Initially, the compression process and loss mechanisms are investigated. Thus, partial processes that need to be reflected in the model are identified. Afterwards, these processes are modelled in an existing tool for refrigeration cycle investigation. The model is calibrated and validated by manufacturer’s data. As a case study, the paper introduces a high temperature heat pump and assesses the performance of different refrigerants using a fluid screening method. The development of this compressor model contributes to developing efficient high-temperature heat pumps and, thus, to decarbonizing industrial processes in the long term.

Kľúčové slová

Screw Compressor
Semi-Physical Modeling
Efficiency
High-Temperature Heat Pump