PDF Publication Title:
Text from PDF Page: 018
Mathematics 2022, 10, 3167 18 of 27 60 55 50 45 Electricity prices on May 29th, 2019 in the Spanish spot market 40 0 2 4 6 8 10 12 Time [h] Figure 9. Electricity prices corresponding to 29 May 2019 in the Spanish spot market, once scaled into a 12 h timeframe [31]. 5.4. Operating Mode Scheduling If the demand profile shown in Figure 7 is analysed together with the cooling power constraints shown in Table 4 and the energy prices shown in Figure 9, it can be observed that, approximately, during the first 5 h, the cooling demand Q ̇ sec can be satisfied by using only Q ̇ e,sec, given the power ranges for modes 1 and 2 presented in Table 4. It may be interesting to charge the TES tank during this period, taking advantage of the low energy price, but in any case the maximum charging power is constrained by the cooling demand, which must be satisfied in mode 1 by the refrigeration cycle. However, from t = 5 h, the cooling demand Q ̇ sec is too high to be satisfied only by Q ̇ e,sec, being necessary to turn to Q ̇ TES,sec to complement the cooling power produced at the evaporator. Then, during the peak period until t = 8 h, the TES tank is intended to be discharged, avoiding as much as possible the direct cooling power production due to the high price corresponding to this period. That is when the high charge ratio achieved previously comes handy. Finally, at the end of the day, the cooling demand is again low enough to allow modes 1 and 2 to be scheduled, thus the TES tank might be also charged during this off-peak period. In the light of the previous analysis, a certain operating mode scheduling must be proposed to make use of the TES tank as a cold-energy storage unit, as efficiently as possible, according to economic criteria. This operating mode scheduling affects the optimization problem posed in Section 4.3 through the feasibility constraints described in (19), as schematically shown in Figure 10. Mode 1 Mode 3 Mode 2 Mode 4 e,sec Q ̇ T ES,sec Q ̇ T ES,sec Figure 10. Influence of the operating mode scheduling on the NMPC optimization problem. Q ̇ r e f ̇ Q ̇ e,sec Q ̇ e , s e c Q ̇ r e f Q ̇ T E S sec QTES A v Cooling power control · Efficiency · Operational constraints Cooling power scheduler · Economics · Efficiency · Feasibility Av,TES Q ̇ r e f TES EEV TES EEV Condenser Compressor Evaporator Q ̇ r e f T ES,sec m ̇ T E S , s e c TES-backed-up TES N refrigeration cycle Tank ]PDF Image | Refrigeration Systems with Thermal Energy Storage
PDF Search Title:
Refrigeration Systems with Thermal Energy StorageOriginal File Name Searched:
mathematics-10-03167.pdfDIY PDF Search: Google It | Yahoo | Bing
Turbine and System Plans CAD CAM: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. More Info
Waste Heat Power Technology: Organic Rankine Cycle uses waste heat to make electricity, shaft horsepower and cooling. More Info
All Turbine and System Products: Infinity Turbine ORD systems, turbine generator sets, build plans and more to use your waste heat from 30C to 100C. More Info
CO2 Phase Change Demonstrator: CO2 goes supercritical at 30 C. This is a experimental platform which you can use to demonstrate phase change with low heat. Includes integration area for small CO2 turbine, static generator, and more. This can also be used for a GTL Gas to Liquids experimental platform. More Info
Introducing the Infinity Turbine Products Infinity Turbine develops and builds systems for making power from waste heat. It also is working on innovative strategies for storing, making, and deploying energy. More Info
Need Strategy? Use our Consulting and analyst services Infinity Turbine LLC is pleased to announce its consulting and analyst services. We have worked in the renewable energy industry as a researcher, developing sales and markets, along with may inventions and innovations. More Info
Made in USA with Global Energy Millennial Web Engine These pages were made with the Global Energy Web PDF Engine using Filemaker (Claris) software.
Sand Battery Sand and Paraffin for TES Thermo Energy Storage More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)