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Energies 2022, 15, 6331 Energies 2022, 15, 6331 15 of 33 1 Parameter BOIL thermal power BOIL outlet temperature P1 outlet pressure P1 nominal flowrate ST nominal power Saturday, Sunday/holidays) and seasons. The profiles were normalized in order to sim- ulate theVusaelrudeemaUndniatccording to the used tPreanrdams oeftceornsumption and the toVtaallaune- U RO Density of the feed water 1026 ◦ ◦C RO Area of membrane 41 35 30 25 20 15 10 5 0 0 730 1460 2190 2920 3650 4380 5110 5840 6570 7300 8030 8760 Time [hours] heating cooling Figure 5. Heating and cooling demand. Heating and cooling demadn [kW] Figure 5. Heating and cooling demand. As regards the electrical energy demand, a similar approach to DHW profiles was adopted, consisting of using some standard loads for different types of days (workday, Table 3. Main parameters of the polygeneration system model. nual consumption of each building. The demand for a single household has been set to P1 outlet pressure bar P6 flowrate 4200 6140 kg/h ST isentropic PV reference ppm0.50 RO Mec-h. efficiency of the driving0.p21ump 45,000 efficiency efficiency 20 ST outlet pressure °C bar g/cm RO Feed water rate COND temperature C WT power kW COND pinch point temp. diff. 4. Results WT height WT shear coefficient 55 kW DC water flowrate 14,700 kg 3000 kWh/year. The adopted profile and the detailed description of the used methodology 220 °C DC air flowrate 51,500 kg are presented in [44]. The cas1e0study wbasr completed with desigPn6pfalorawmreateters of the developed pol4y2g0en0- kg eration system, selected in order to size the system components as well as set a proper 65.5 kg/h P9 flowrate 6140 kg dynamic operation of the whole system from the point of view of temperatures, mass flow 5 kW PV power 5 k rates, and energy flows. The design of the system was carried out with the scope to match STisentropicefficiencytheuserhe0a.t5in0g,coolin-g,andDHWdemPVanrdeafnerdeenleccetreicfafilclioeandceyntirely.Thelisto0f.2th1e main parameters adopted for the system is reported in Table 3. ST outlet pressure 0.386 bar PV temperature coefficient −0.0035 1/ COND temperature 75 °C WT power 10 k 19.9 m Unit COND pinch point temp. diff. 3 °C Value °C m3 °C kW kW °C WT height Unit Parameter TK1 set point temperature TK1 volume AHX set point temperature AUX capacity ACH cooling power ACH set point RO Feed water salinity RO Feed water temperature RO Feed pressure 65 55 220 10 65.5 5 WT shear coefficient 0.14 Table 3. Main parameters of the polygeneration system model. Parameter BOIL thermal power BOIL outlet tempera6t5ure P1 nominal flowrate ST nominal power Value 14,700 51,500 10 BAT capacity ◦C DC air flowrate BAT power 100 kW 50 BAT charging efficiency 0.98 40 kg/h P9 flowrate kg/h 10 BAT minimum state of charge 0.10 -0.85 486 m 1/◦C 0.3 67 0.386 375 3 bar PV temperature RO Recoevffiecrieyntratio −0.0035 10 19.9 kW DC water flowrate kg/h BAT maximum state of charge 0.90 kW PV power 5 kW m - while its discretization has been set by adopting a timestep of 5 min. The selection timestep was determined on the basis of the sampling time of DHW profiles takin account the convergence of the calculation for iterative components (tanks and co lers). TK1 set point Intemorpdereartutroe perform the dynamic simulation of the proposed small-scale hybri ◦C ygeneration system, the period of one year was considered (0–8760 h) as a time 65 0.14 TK1 volume 10 m3 BAT capacity 100 kWh With the selected global simulation parameters, the results as temperatures, kg/h 25 kPDF Image | Hybrid Polygeneration System Based on Biomass Wind and Solar Energy
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