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Volumetric design for ORC-VCC compressor-expander units.

Author(s) : MARION M., LOUAHLIA H.

Type of article: IJR article

Summary

The combination of an ORC (Organic Rankine Cycle) with a VCC (Vapor Compression Cycle) is studied analytically. In this work, the two cycles use the same fluid and operate with a common condenser. Elementary transformations of the fluid between two consecutive points of the system are calculated using a one-dimensional thermodynamic approach considering real fluid properties, the pressure losses and irreversibilities present in the compressor, in the expander and in the pump. The performances and the recommended inlet and outlet diameters of the expander and the compressor are established for various operating conditions and 12 fluids. The system can produce a typical useful cooling capacity of 0.60 kW at 5.5 °C when using a 2 kW heating source at 65 °C and when the condenser temperature is 30 °C. The cooling capacity reaches 1.0 kW if the cold source temperature is 15.5 °C. Results show the required diameters ratios at inputs and outputs of the compressor and the expander. They indicate the situations for which the compressor is smaller than the expander and vice versa. They identify the particular cases in which the compressor and the expander have exactly the same inlet and outlet diameters. This particular case allows using two identical compressors, one working as a compressor, the second as an expander.

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Pages: 1-10

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Details

  • Original title: Volumetric design for ORC-VCC compressor-expander units.
  • Record ID : 30029207
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 132
  • Publication date: 2021/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.09.013
  • Document available for consultation in the library of the IIR headquarters only.

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