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1 2 3 4 5 6 7 8 9 used for the production of domestic hot water (DHW) while the second one (HX2) supplies hot water for space heating purposes. When the system is running in heat recovery mode, an air-cooled gas cooler/condenser allows further cooling the refrigerant exiting the heat exchangers, otherwise the two heat exchangers are by-passed and the whole heat is rejected into the ambient. If there is no demand for heat recovery from the supermarket, the system runs in floating condensing mode i.e. the high stage pressure follows the ambient temperature; thus subcritical operation takes place when outdoor temperature is lower than 20 °C, transcritical operation when outdoor temperature is higher than 26 °C and transitional mode in between. The rules for high stage and intermediate pressure control in transcritical and transitional modes are described in Section 3.1. 10 11 12 13 14 15 16 17 18 19 20 cooler (Sawalha, 2013, Tambovtsev et al., 2010), thus increasing the mass flow rate of refrigerant and 21 On the contrary, when recovery is required, the high stage pressure of the system may be increased according to the demand, up to forcing the system to transcritical operation. Furthermore, it is possible to increase the amount of thermal energy recoverable from the two heat exchangers by reducing the subcooling in the gas consequently the recoverable heat. This is done by reducing fan speed and by-passing the gas cooler. Finally the system is also provided with an air-cooled “load evaporator” which can be used as a supplemental 22 23 24 25 heat source and is activated during low refrigeration duty periods, when the heat rejected by the HX2 heat 26 exchanger is not sufficient to meet the heating demand of the building. The pressure at the additional 27 28 29 30 order to allow for heat recovery from outside. In this case, superheated vapour at its outlet is collected by the 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 evaporator pLE can be further controlled by valve EV2 below pINT depending on the outdoor temperature, in parallel compressor, while the possible small amount of flash gas from the liquid receiver is expanded to pMT and finally sent to the HS compressors rack.PDF Image | R744 BOOSTER INTEGRATED SYSTEM
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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