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Technological innovations in heat pump systems

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Technological innovations in heat pump systems ( technological-innovations-heat-pump-systems )

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274 R. M. Lazzarin Figure 15. Transcritical cycle for a carbon dioxide heat pump equipped with an expander device. Figure 16. Comparison between the energy input required by a heat pump with or without the expander. Regarding the expansion, usually achieved by throttling, prototypes have been developed to exploit the refrigerant expansion to produce a fraction of the compres- sion work. The benefit can be appreciable in transcritical cycles such as with carbon dioxide [5]. A specific cooling effect increment is obtained (Fig. 15). Moreover the Downloaded from https://academic.oup.com/ijlct/article/2/3/262/758006 by guest on 21 June 2022 International Journal of Low Carbon Technologies 2/3

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