High efficiency sub-critical carbon dioxide supplementary heat pump for low temperature climates (energy and exergy analysis)

Purjam, Mojtaba; Goudarzi, K.

doi:10.1016/j.renene.2018.10.024

Cited by 11 publications

(1 citation statement)

References 21 publications

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“…Because of this, their COP is usually smaller than other ones with organofluorine-based refrigerants. In order to enhance the COP, researchers tried different layouts and components such as internal heat exchangers 4) , cascade cycles 5), 6) , turboexpanders 7), 8) , multistage compression 9),10), 11) , vortex tube expansions 12) , subcooling boost 13), 14) .…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Feasibility Evaluation of a Novel Lowtemperature Ejector-based Trans-critical R744 Refrigeration Cycle

Purjam

Thu²,

Miyazaki³

2021

Evergreen

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In conventional ejector refrigeration cycles, the ejector mostly operates at fixed pressure points in the secondary stream and outlet. Studying the sensitivity of the system to the pressure alternation of the mentioned points has not been investigated. To cover this gap, an extra turboexpander, compressor, and gas cooler were introduced to the conventional ejector layout. It was found that pressurizing the secondary entrance of the ejector could be beneficial to COP if it is not warmer than the gas coolers. Also using the expansion process right after the ejector has the potential to increase the efficiency of the system if the discharge pressure of the ejector reaches supercritical or superheat condition.

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