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Stratified Case Results with Bypass The results corresponding to the stratified case with bypass, considering that there is no energy recovery when the SHP is switched off, are presented in Figure 6, 7 and 8. In them, the results for the different values of the optimization variables: SHP size and tank volume for the 1st, 4th, and 7th nEonderegi,erse2s0p20e,c1t3i,v6e5l7y6, are illustrated. The performance map for the annual energy consumption an1d1 tohf 2e4 SHP working hours are included for each case. (( FFigiguurree66.. PePrefrofromrmanacnecemmapaspsfofrorthtehecocnotnrtorlolnondodeepplalcaecdedininththee11ststnnooddeeooffththeeaannnuuaalleenneerrggyy Energies 2020, 13, x FOR PEER REVIEW 11 of 25 Energicecoson2n0ss2uu0m,m1p3pt,itxoionFnOaaRnndPdEwEoRorrRkkEiniVngIgEhhWoourrssffoorrttheevaallueessoffSHPandttankssiize.. 11 of 25 (( (( Figure 7. PPeerfroformrmaanncecemaappssfoforrththeeccoonntrtroollnnooddeepplalacceeddinintthee4tthnodeofftheannuallenergy Figure 7. Performance maps for the control node placed in the 4th node of the annual energy consumption and working hours for the values of SHP and tank size. consumption and working hours for the values of SHP and tank size. (( (( Figure 8. Performance maps for the control node placed in the 7th node of the annual energy Figure 8. Performance maps for the control node placed in the 7th node of the annual energy Figure 8. Performance maps for the control node placed in the 7th node of the annual energy consumption and working hours for the values of SHP and tank size. consumption and working hours for the values of SHP and tank size. consumption and working hours for the values of SHP and tank size. It is observed that the number of operating hours as well as the energy consumption of the system Similarly, to the variable-water-volume, the best results are obtained for the lowest values of Similarly, to the variable-water-volume, the best results are obtained for the lowest values of is significantly higher than in the variable-water-volume case. This is a consequence of the fact that SHP size dominates over the tank size from the energy consumption point of view, however in this SHP size dominates over the tank size from the energy consumption point of view, however in this in this system typology, there are operation modes in which the SHP is not working and therefore, case, the tank volume has a higher influence on the energy consumption of the system. Regarding case, the tank volume has a higher influence on the energy consumption of the system. Regarding water from the net is entering directly to the tank without any preheating. This has the advantage the control node, the best results are obtained for the highest position. However, as low is the position the control node, the best results are obtained for the highest position. However, as low is the position of saving heat source water, but on the other side, the energy consumption is penalized and the heat of the control node in the tank, there are more SHP-tank combinations satisfying the comfort of the control node in the tank, there are more SHP-tank combinations satisfying the comfort pump has to work more hours in such a way the water saving is not so important as expected. restrictions imposed to the problem. Thus, it is possible to conclude that the highest position for the restrictions imposed to the problem. Thus, it is possible to conclude that the highest position for the control node is the optimal one but for these cases, the design of the system is more critical, as the control node is the optimal one but for these cases, the design of the system is more critical, as the Stratified Case Results without Bypass allowed tank and SHP sizes are more restricted. allowed tank and SHP sizes are more restricted. The results corresponding to the annual energy consumption and to the working hours are It is observed that the number of operating hours as well as the energy consumption of the It is observed that the number of operating hours as well as the energy consumption of the presented in Figure 9 for the case in which the control is performed in the node 1 which corresponds system is significantly higher than in the variable-water-volume case. This is a consequence of the system is significantly higher than in the variable-water-volume case. This is a consequence of the fact that in this system typology, there are operation modes in which the SHP is not working and fact that in this system typology, there are operation modes in which the SHP is not working and therefore, water from the net is entering directly to the tank without any preheating. This has the therefore, water from the net is entering directly to the tank without any preheating. This has the advantage of saving heat source water, but on the other side, the energy consumption is penalized advantage of saving heat source water, but on the other side, the energy consumption is penalized and the heat pump has to work more hours in such a way the water saving is not so important as and the heat pump has to work more hours in such a way the water saving is not so important as expected. expected.PDF Image | Thermal Energy Storage Strategy Booster Heat Pump Low Temp
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