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

2. Outline Midterm 1 Recap Battery Array Progress Overview of Thermal Storage System Tentative Procurement Options Future Plans Conclusion Questions Artur Nascimento2

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 Artur Nascimento3

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 Artur Nascimento4

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 1.The maximum peak load for the house is 5 kwh 2.This peak load will occur during the summer 3.Using previous load data from a similar house we could create a general model for the load of the OGZEB house 4.Ideally, the batteries should be able to power the house for 24 hours. This minimum requirement was set by Dr. Ordonez Corey Allen5

6. OGZEB load analysis The AC system consumes the most energy Peak Load: 5kwh Average Load: 1.9kwh Avg. Load per day: 46kwh Winter Fall SummerSpring Corey Allen6

7. Battery Selection Battery TypeDimensions (L x W xH) (mm) Weight (kg) VoltageAmp- Hours (@ 20 hr) LifetimeCost (per battery) Trojan T-105264 x 181 x 2762862253 - 6 years$140 Trojan L16H296 x 176 x 4255764356 - 8 years$315 Surrette 4- CS-25PS 559 x 286 x 464115682012-15 years$1,337 Trojan T-105Trojan L16H 8 in series 48 Volts 225 A-hr 8 in series 48 Volts 225 A-hr 8 in series 48 Volts 435 A-hr Final Analysis Battery# of batteryInitial Power Total Price T-1051621.8 kwh$2240 L16H820.8 kwh$2520 Corey Allen7

8. Thermal Storage Designs Tristian Jones8

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 Chiller Glycol In Glycol Out Water Tank Water Pump Fan and Heat Exchanger Water in Water Out Air out Air in Tristian Jones9

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 Jones10

11. Refined Design Visualization Chiller Warm Glycol Out Finned Water Tanks (3) Air In Air Out Cold Glycol Into Box Battery Container Cool Air in Tristian Jones11

12. Cold Storage Box and Heat Exchanger Hot air in Cold air out Cold Glycol from Chiller Warm Glycol to Chiller Water Tanks Fins Tristian Jones12

13. Battery Temp Regulation Battery Container Valve Temperature Sensor and valve actuator Cold Air from system used to cool batteries Kristian Hogue13

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 Hogue14

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

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 Jones16

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 Jones17

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 Jones18

19. Ice Melt Analysis Artur Nascimento19

20. Procurement (Thermal) PartSupplierCostNotes ChillerMokon$5920New (1 ton) Ebay$1250 - 2550Used, cosmetically unappealing (0.68 ton) FanGrainger$260870 cfm BoxesHome Depot$2.8 / sq. ft.Weldable Aluminum Storm$18 / sq. ft.Copper Sheet WoodHome Depot$0.85 / sq. ft.plywood Home Depot$2.50 / boardBoard 2” x 4” x 8’ InsulationHome Depot$12 / packFiberglass (roofing) 9.5” x 15” x 25’ TubingGrainger$2.50 / ft.Refrigeration coil 3/4” OD Home Depot$2.90 / ft.Soft Copper Utility Coil Home Depot$1.40 / ft.Copper Utility Coil Total Estimated Cost $2400 Material only, does not include regulatory electronics, only for thermal system Artur Nascimento20

21. Conclusion Battery type, number, arrangement and supplier have been determined Thermal Energy Storage System design concept complete Suppliers and parts located Artur Nascimento21

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 Artur Nascimento22

23. Questions 23