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is 1–2 kW higher than the one produced by the COND, and this determines a sl system. It is worth noting that in the first morning hours the user space heating d s w w o e o h e h o o h e o e o d Energies 2022, 15, 6331 morning peak of DHW demand occurs, to 13.8 kW, which shows that1t8hoef 3s3ystem achieved since the cogeneration process is designed and managed in order ac crease in TK1 tank temperature (Figure 6). During the morning hours, the heat is 1–2 kW higher than the one produced by the COND, and this determines a sl to tank TK1 by the condenser, COND, decreases from a maximum of 28.1 kW, crease in TK1 tank temperature (Figure 6). During the morning hours, the heat s morning peak of DHW demand occurs, to 13.8 kW, which shows that the system to tank TK1 by the condenser, COND, decreases from a maximum of 28.1 kW, with a significant variation of the load during the day. This operation charact with a significant variation of the load during the day. This operation charact elasticity in the production of heat as a function of the thermal load of the user. achieved since the cogeneration process is designed and managed in order ac that the first one is capable of operating at a minimum regime and providing a constant elasticity in the production of heat as a function of the thermal load of the user. power, while the second one may operate in a very variable regime for a single 24 h period. 40 40 30 30 20 20 10 10 0 0 336 340 344 348 352 356 360 336 340 344 Time [hours] 348 Time [hours] HEAT,USER BOIL COND COND 352 356 360 BOIL DHW HEAT,USER DHW Figure 7. Main thermal powers for the representative winter operation day. Figure 7. Main thermal powers for the representative winter operation day. Figure 7. Main thermal powers for the representative winter operation day. 12 12 10 10 8 8 6 6 4 4 2 2 0 0 336 336 ST 340 340 344 348 Time [hours] 344 348 352 356 360 WT PV 352 356 360 GSET USER BAT,discharge BAT,charge Time [hours] ST WT PV BAT,discharge BAT,charge GSET Figure 8. Main electrical powers for the representative winter operation day. USER Figure 8. Main electrical powers for the representative winter operation day. As regards the energy storage system, the selected day starts with the discharge of the Figure 8. Main electrical powers for the representative winter operation day. battery, BAT, being used to compensate the demand of the user due to null photovoltaic The electrical power of the steam turbine, ST, reported in Figure 8, follows t field, PV, power production and scarce wind turbine, WT, power. However, the battery trend of the heat produced by the boiler, BOIL, as expected due to a partializati The electrical power of the steam turbine, ST, reported in Figure 8, follows t discharges completely just after 5:00 am, and the auxiliary generator set LPG must be turbine operation as a function of the heat demanded by the user. In this way, st atrcetinvadteodfinthoerdheeratotpmraotcdhutchedlobadyotfhtehebuosielerr(U,BSEORI)L.T,haesaeuxpileiacrtyepdodwuereistopraodpuacretdializati bine power production varies between 1.6 and 3.3 kW. In comparison, the variati turbine operation as a function of the heat demanded by the user. In this way, st until the user demand drops at about 6:30 am due to the deactivation of the reverse osmosis other renewable electrical energy sources is higher since wind turbine, WT, pow unit, RO. In the remaining part of the day, the system is able to produce excess energy bine power production varies between 1.6 and 3.3 kW. In comparison, the variati with respect to the demand of the user, and the battery system is charged with a maximum lates from almost 0 kW at the beginning of the day to the nominal value at the en other renewable electrical energy sources is higher since wind turbine, WT, pow power of 5.9 kW. lates from almost 0 kW at the beginning of the day to the nominal value at the en The operation of the system from the standpoint of view of production and usage of water is shown in Figure 9. The daily operation starts with the refill of desalinated water E l e c t E r i l c e a c l t r p i c o a w l e p r o [ wk We r ] [ k W ] T h e r mT h a e l r p m o a w l e p r o [ wk We r ] [ k W ]PDF Image | Hybrid Polygeneration System Based on Biomass Wind and Solar Energy
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