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OGZEB Hybrid Thermal Electrical Energy Storage System Midterm 2 Presentation

OGZEB Hybrid Thermal Electrical Energy Storage System Midterm 2 Presentation. Sponsors/Advisors : Dr. Li, Dr. Ordonez, Dr. Zheng Date : 11-21-2013. Team members : Corey Allen, Anthony Cappetto , Lucas Dos Santos, Kristian Hogue, Nicholas Kraft, Tristian Jones, Artur Nascimento. Outline.

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OGZEB Hybrid Thermal Electrical Energy Storage System Midterm 2 Presentation

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  1. OGZEB Hybrid Thermal Electrical Energy Storage System Midterm 2 Presentation Sponsors/Advisors: Dr. Li, Dr. Ordonez, Dr. Zheng Date: 11-21-2013 Team members: Corey Allen, Anthony Cappetto, Lucas Dos Santos, Kristian Hogue, Nicholas Kraft, Tristian Jones, ArturNascimento ArturNascimento

  2. Outline • Midterm 1 Recap • Battery Array Progress • Overview of Thermal Storage System • Tentative Procurement Options • Future Plans • Conclusion • Questions ArturNascimento

  3. Midterm 1 Recap • Design energy storage system for the OGZEB • System must store excess power generated by the house’s solar cells to be used at night • System will consist of an array of batteries and a thermal energy storage device ArturNascimento

  4. Midterm 1 Recap • Objective 1: Develop a model of the house’s power needs to determine the best type, number, and arrangement of batteries for the house • Objective 2: Create a cold reservoir to store thermal energy ArturNascimento

  5. Battery Selection • Group was unable to get the proper load data we needed from the house due to technical issues. • After talking to Thomas (sponsor), we were able to make the following assumptions about the house • The maximum peak load for the house is 5 kwh • This peak load will occur during the summer • Using previous load data from a similar house we could create a general model for the load of the OGZEB house • Ideally, the batteries should be able to power the house for 24 hours. This minimum requirement was set by Dr. Ordonez Corey Allen

  6. OGZEB load analysis • The AC system consumes the most energy • Peak Load: 5kwh • Average Load: 1.9kwh • Avg. Load • per day: 46kwh Spring Summer Winter Fall Corey Allen

  7. Battery Selection Trojan T-105 Trojan L16H Final Analysis 8 in series 48 Volts 435 A-hr 8 in series 48 Volts 225 A-hr 8 in series 48 Volts 225 A-hr Corey Allen

  8. Thermal Storage Designs Tristian Jones

  9. Initial Design • Chiller cools water during the day • Cold water is pumped into coils to exchange heat with the air into the house • Arrangement is relatively compact and common in existing systems • Requires the use of a pump and fan at night, reducing power savings • Risk of damaging pump with shards of ice Fan and Heat Exchanger Water Out Glycol In Air out Chiller Air in Glycol Out Water Pump Water in Water Tank Tristian Jones

  10. Refined Design Concept • Chiller cools water during the day • Water cooled inside of tanks • Tanks are designed to maximize heat transfer when air is drawn past them • Air run directly over tanks into the house • Removes pump from previous design Tristian Jones

  11. Refined Design Visualization Finned Water Tanks (3) Air In Air Out Cold Glycol Into Box Warm Glycol Out Cool Air in Chiller Battery Container Tristian Jones

  12. Cold Storage Box and Heat Exchanger Fins Water Tanks Cold Glycol from Chiller Warm Glycol to Chiller Cold air out Hot air in Tristian Jones

  13. Battery Temp Regulation Cold Air from system used to cool batteries Battery Container Temperature Sensor and valve actuator Valve Kristian Hogue

  14. Battery Temp Regulation Thermal Battery Management Specifications - Arduino Uno Project Board - 14 Digital outputs/inputs - 6 of 14 are Digital PWM - 6 analog input pins - This board will be programed to control the valves into the battery boxes Kristian Hogue

  15. Other items • LCD screen to • display the temperature • 2 Stepper motors • to control the valves • Thermostat or Thermistor • to observe the temperature • of the box Kristian Hogue

  16. Additional Components • Chiller and fan to be purchased according to specs • Current design utilizes a 0.68 ton chiller and 870 cfm fan • Secondhand products may be available (Recycled products are a plus for the OGZEB) • Lumber and insulation can be bought from local hardware stores • Aluminum for water tanks available online Tristian Jones

  17. Additional Design Aspects • Outside of air exchange box to be insulated with roofing insulation, to minimize heat transfer to environment • Inside of wooden air exchange box to be painted with anti-mold and mildew paint • Air exchange box to have drain to remove condensation • If batteries begin to overheat, valve opens to allow cold air from the system to cool the batteries Tristian Jones

  18. Design Evaluation • Removes pump from previous design, resulting in greater system efficiency • Provides for a variety of design features such as battery temperature regulation • Addresses the home’s primary energy usage: air conditioning • Is bulky compared to the initial design • Air exchange box alone is currently 2 x 3.4 x 7.8 ft Tristian Jones

  19. Ice Melt Analysis • For the analysis of the fin heat transfer, the assumption of an adiabatic fin tip was made due to the fin tip being up against the inside surface of the wood box. • Assumed ambient temperature of 20 C and ice temperature of 0 C. • Water latent heat of fusion = 334 kJ/kg • Total heat loss required to melt 400 L ice = 133.6 MJ • The heat loss rate through the NON-FINNED area of 3.13 square meters will be approximately 838W. • The total heat transfer for a fin (adiabatic tip) is given by: • The total heat transfer for a single aluminum fin was found to be 40.5 W. • If the total heat transfer for a single fin is multiplied by the number of fins (48 total), a total fin heat transfer rate can be calculated to be 1942 W. • If both the non-finned surface heat transfer and finned heat transfer are added together the combined total heat transfer (H) can be calculated to be 2780 W. • Finally, the melting time can be calculated: ArturNascimento

  20. Procurement (Thermal) ArturNascimento

  21. Conclusion • Battery type, number, arrangement and supplier have been determined • Thermal Energy Storage System design concept complete • Suppliers and parts located ArturNascimento

  22. Future Plans • Continue analysis of proposed thermal system • Investigate potential for compacting system • Order materials • Install battery array • Begin design of energy management system and housing integration • Evaluate potential of adapting system to work during the winter, when AC use is unnecessary ArturNascimento

  23. Questions

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