PDF Publication Title:
Text from PDF Page: 013
Energies 2020, 13, x FOR PEER REVIEW Energies 2020, 13, 5654 Table 4. COPHP and COPsys in heating period. Day Period COPHP COPsys All day 2.16 2.05 + P 13 of 17 13 of 18 ) and by the (1) absorbed by the compressors of the low and high-temperature cycles (P auxiliaries of the hydronic system (Paux). 4 December 2.16 8:09/9:00 Q1 2.18 18 November 6:28/7:26 All day 2.15 2.06 2.04 2.07 1.98 1.96 comp,H comp,L COPHP = 29 December AllPdcoamyp,L + P2c.o1m7p,H 9:00/10:00 In cooling mode, the cycle working with R1234ze is off and only the CO2 thermodynamic cycle COPsys = Q1 Pcomp,L + Pcomp,H + Paux (2) 2.17 is switched on. The hydronic module modifies its layout by changing the position of the two 4-way During these days, the source temperatures are 12 ◦C, 9.5 ◦C, and 7.1 ◦C for November and 4 and valves. In this configuration, the BHE field loop exchanges heat with the gas cooler heat exchanger 29 December. while the user tank exchanges heat with the evaporator heat exchanger. Unlike the heating mode, the In cooling mode, the cycle working with R1234ze is off and only the CO2 thermodynamic cycle is pressures of the CO2 cycle are different because the high pressure (HP) is set by the controller of the switched on. The hydronic module modifies its layout by changing the position of the two 4-way valves. heat pump in order to obtain the optimal value, which is a function of the outlet temperature at the In this configuration, the BHE field loop exchanges heat with the gas cooler heat exchanger while the gas cooler heat exchanger. Therefore, in this case, the pressure depends on the temperature of the user tank exchanges heat with the evaporator heat exchanger. Unlike the heating mode, the pressures heat carrier fluid in the BHE field loop. Similarly, as shown for the heating mode, few days have been of the CO2 cycle are different because the high pressure (HP) is set by the controller of the heat pump analyzed in detail to show the behavior of the heat pump from the temperature and pressure point in order to obtain the optimal value, which is a function of the outlet temperature at the gas cooler of views. heat exchanger. Therefore, in this case, the pressure depends on the temperature of the heat carrier In particular, the temperature profile and the operating pressures of the cycle have been fluid in the BHE field loop. Similarly, as shown for the heating mode, few days have been analyzed in analyzed for one day in June, July, and August. Moreover, the one on-off cycle of the heat pump can detail to show the behavior of the heat pump from the temperature and pressure point of views. be seen in detail for each representative day. In particular, the temperature profile and the operating pressures of the cycle have been analyzed The temperature of the water entering the evaporator and, therefore, at the user side of the heat for one day in June, July, and August. Moreover, the one on-off cycle of the heat pump can be seen in pump is about 7.4 °C for the months of June and July, while it is an average of 7 °C in August. On the detail for each representative day. other hand, the temperature exiting the evaporator is set to 6 °C. Considering the source side of the The temperature of the water entering the evaporator and, therefore, at the user side of the heat heat pump, the temperature of the heat carrier fluid coming from the BHE field loop is around 17.7 pump is about 7.4 ◦C for the months of June and July, while it is an average of 7 ◦C in August. On the °C in June on a monthly average, 18.8 °C in July, and 17.3 °C in August. Respectively, inside the gas other hand, the temperature exiting the evaporator is set to 6 ◦C. Considering the source side of the cooler, its temperature is increased to 23.2 °C, 24.3 °C, and 22.4 °C. ◦ heat pump, the temperature of the heat carrier fluid coming from the BHE field loop is around 17.7 C The average monthly temperature of the water inside the storage tank is 6.6 °C in June, and 6.9 in June on a monthly average, 18.8 ◦C in July, and 17.3 ◦C in August. Respectively, inside the gas cooler, °C in July and August. ◦ its temperature is increased to 23.2 C, 24.3 ◦ C, and 22.4 ◦ C. In Figures 12–17, the trends of the system’s temperatures and R744 pressures are represented for The average monthly temperature of the water inside the storage tank is 6.6 ◦C in June, and 6.9 ◦C 29 June, 19 July, and 22 August 2018. The charts show the heat carrier fluid temperatures at the inlet and outlet of the evaporator at the user-side of the HP and the heat carrier fluid temperatures at the in July and August. In Figures 12–17, the trends of the system’s temperatures and R744 pressures are represented for inlet and outlet of the condenser coupled with the BHE field. 29 June, 19 July, and 22 August 2018. The charts show the heat carrier fluid temperatures at the inlet The representative day for June was 29, when the heat pump was on nearly 9 h. The high and outlet of the evaporator at the user-side of the HP and the heat carrier fluid temperatures at the pressure of the cycle at the gas cooler varied between 45 and 70 bar while the low pressure and suction inlet and outlet of the condenser coupled with the BHE field. pressure were in the range of 25 and 50 bar, as for the other analyzed summer days. (a) (b) Fiigure 12.. SSysstteem’’sstteempeerratturress ((a)) and prressures (b)—29 June 2018..PDF Image | Novel Ground-Source Heat Pump with R744
PDF Search Title:
Novel Ground-Source Heat Pump with R744Original File Name Searched:
energies-13-05654.pdfDIY PDF Search: Google It | Yahoo | Bing
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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |