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Energies 2022, 15, 6331 Energies 2022, 15, 6331 20 21 of 33 in the morning hours. This trend is due to the thermal capacity of the TK1 tank relatively high temperature. Conversely, a much more rapid response of the vari boiler, BOIL, and condenser, COND, power is achieved when the DHW deman maximum production is also achieved by the photovoltaic field, PV, at about 1:00 p.m., due . ation of the at a minim m power of ind turbine h the cut-in nificant win of 2.0 and field, PV, 30 before 8:00 p.m., since it causes a noticeable variation of the TK1 tank. 10 to the peak of solar energy availability. 40 0 50 40 16 50 20 50 24 50 28 50 32 50 36 50 im e [h our s] BO IL CO D AH X CH ,GE N CO OL, SE R DH 11 .M ai th er a lp w ers for th er epr es nt ati es u m er op ra io d F ig re 1 ,t he el ect ric al po w rs co nc er in gt he s m m r p k , wh ile in th e e ai ni g ti e, th e o e rr ac he sa m ax im ns eq ue nc o ft ei nc re se si t e co li g loa d of he u er .T he st ar to ft e da yi t rn ed of fs nc et he wi nd s ee d o s ot re 30 T NAUW Figurenmoevmetnay 20 are shown. The steam turbine, ST, operates for about half of the time of1.5W rmnm pwe u asaco e h a nh on t s w hefirphsui pdenac old o0 f the unit, while in the second part of the day, two periods of sig Inu2 e n ueoer 10 5016 5020 5024 5028 5032 5036 5040 ability are present allowing the device to achieve a relative maximum Time [hours] A similar maximum production is also achieved by the photovoltaic BOIL COND AHX ACH,GEN COOL,USER DHW t 1:00 p.m., due to the peak of solar energy availability. Figure 11. Main thermal powers for the representative summer operation day. Figure 11. Main thermal powers for the representative summer operation day. 7 In Figure 12, the electrical powers concerning the summer oper areshw h mu S p e of 1.5 kW, while in the remaining time, the power reaches a maximu 5 the fir r o u n d d p d e n ac 4 old of the unit, while in the second part of the day, two periods of sig abilityew chavaum A similar maximum production is also achieved by the photovoltaic o n. T e ste a t rb in e, T, o er ate sf or ab ou th alf of th et im n eq ue nc eo ft e inc re se si nt he co oli ng lo d of th u ser .T he st pa t ft he da yi st r e of fs inc et he wi n s ee d o s ot re a re pr se nt all o in gt he de vi e to ac ie ve ar el ti e m xi m .m ., u t t e e k of sol ar en er y av il bi lit . 6 asacosha aew 3 1:00 p d e o h p a 5020 5024 WT PV g a a 5028 5032 Time [hours] BAT,discharge y 2 1 7 0 6 5016 5 ST 5036 5040 BAT,charge USER ation of the at a minim m power of ind turbine h the cut-i nificant wi of 2.0 and field, PV, Figur4e 12. Main electrical powers for the representative summer operation day. Figure 12. Main electrical powers for the representative summer operation day. The operation of the battery is variable since it shifts from a period of discharging and 3 chargTinhgeovoepr ethreatdiaoyn, doefpetnhdeinbgaotntetrhye oisngvoainrgiapbrloeduscintiocne oitf psohwifetrsafnrdomtheadepmearnioddofof disc the user. For the selected day, the battery system, BAT, provides 21.2% of the demand of and2charging over the day, depending on the ongoing production of power and the user, which is a significant contribution for covering the user load in the selected day. mand of the user. For the selected day, the battery system, BAT, provides 21.2 1 4.3. Monthly Results The monthly thermal energies of the system and the thermal demand of the user 0 are p5r0e1s6ented in 5F0ig20ures 13 a5n0d2414, respe5c0t2iv8ely. The5t0h3e2rmal ene5r0g3y6 produce5d040by the Time [hours] condenser, COND, is the highest in the first month due to the heat demand of the user, and it varies between 10.2 and 15.5 MWh throughout the year. In general, the steam ST WT PV BAT,discharge BAT,charge USER cycle system runs at a higher load in winter with respect to the summer; nevertheless, the Figure 12. Main electrical powers for the representative summer operation day. The operation of the battery is variable since it shifts from a period of disc and charging over the day, depending on the ongoing production of power and u , a u n n a d h % Electrical power [kW] Electrical power [kW] Thermal power [kW] Thermal power [kW]PDF Image | Hybrid Polygeneration System Based on Biomass Wind and Solar Energy
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