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Carbon dioxide based cascade systems for simultaneous refrigeration and heating applications.
Author(s) : SARKAR J., BHATTACHARYYA S., GOPAL M. R.
Summary
Industries such as food processing, pharmaceutical, etc. require simultaneous refrigeration and heating. Ammonia and carbon dioxide in a single-stage system do not seem to offer an efficient solution for large temperature lifts, e.g. simultaneous refrigeration up to -50 °C and heating up to 100 °C. Cascade systems offer feasible solutions in such applications. In the paper, four system configurations have been analysed: single-stage NH3, single-stage CO2, a cascade system (NH3-CO2) with CO2 on the higher side and finally a cascade system with CO2 on the lower side. Detailed performance analysis in terms of both COP and exergetic efficiency has been carried out for simultaneous refrigeration up to -50 °C and heating of air or water up to 100 °C. As expected, the cascade systems show superior performance compared with the single stage-systems. It is also evident that an opportunity exists for the optimization of the intermediate temperature of cascade systems to maximize the COP.
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Details
- Original title: Carbon dioxide based cascade systems for simultaneous refrigeration and heating applications.
- Record ID : 2005-1799
- Languages: English
- Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
- Publication date: 2004/08/01
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Indexing
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Themes:
Compressors;
Ammonia;
CO2 - Keywords: Refrigeration; Refrigerating system; Comparison; Calculation; Ammonia; Performance; Optimization; Single-stage system; Cascade system; COP; Heating; CO2
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