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S a w y e r E n v i r o n m e n t a l C h a n g e s

S a w y e r E n v i r o n m e n t a l C h a n g e s. Mechanical Engineering Department Capstone 2011-2012 Amy R. Dan H. Colby C. Brittany P. Richard G. Overview. Current Situation Possible Changes Outcome & Implementation Considerations Conclusion. At Present:.

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S a w y e r E n v i r o n m e n t a l C h a n g e s

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  1. Sawyer Environmental Changes Mechanical Engineering Department Capstone 2011-2012 Amy R. Dan H. Colby C. Brittany P. Richard G.

  2. Overview • Current Situation • Possible Changes • Outcome & Implementation • Considerations • Conclusion

  3. At Present: • Primary concerns: • Work Environment • Comfort • Performance • Efficiency • Money • Resources • Equipment

  4. Why is it so inefficient? • Current system installed in the 1980’s • Pneumatic controls do not have feedback and runs 24/7. • Building has a fan and damper system. Dampers open or close depending on demand. • System power consumption is constant regardless of demand. When the system is on it is running at full power.

  5. The system fights itself • Heat is on in the summer therefore air conditioning runs. • For example in the month of June it was found that the same amount of money was spent on electricity and natural gas. Shown on graph in slide 4 as $50.00 per day.

  6. Proposed Solution • Replace motors in air handling units. Install a variable frequency drive to improve control and motor efficiency. • Most of the system remains in place to minimize expense and limit work interruptions. • A variable speed drive involves electrical components that quickly respond to conditions to provide proper flow. • The system would then control the speed that the fan moves. • Better temperature control, with less energy used by the fan.

  7. Motor • Teco-Westinghouse Motor compatible with Yaskawa VFD • More efficient • Higgins Electric Motor Service Ordered on 12/5/11

  8. Exhaust Consolidation • The building exhausts from three primary air handling units. • 14 fume hoods each have separate exhaust systems. • Fume hoods and the exhaust system are both removing energy. All exhaust systems need to connect to a control. • Combining the exhaust of 14 fume hoods make it easy to measure the mass flow rate through the system, this would reduce the power needed to run the fume hood exhaust system.

  9. Other Energy Usage • The ice core freezers are a necessary draw of energy. • A power measurement system is planned to monitor power consumption from the ice core freezer. • The system would be installed on Friday the 18th by a University electrician and Anna Demeo. • This system would give immediate feedback on improvements.

  10. For the Future • Energy audit will be performed by CordjiaCapital Projects Groups. • Our team will collect a month of data on energy needs of the building. • Information on the cost of the new equipment including initial purchase, installation, maintenance. The return on the investment will be obtained. • More information will be found on the Bangor Hydro grant.

  11. Deliverables • Data sheets with expected cost, savings, and specs on all proposed changes. • Live information on the cooler’s energy use for the building. • Data for winter energy use in Sawyer • Indoor Pest Repellent: Electronic.

  12. Non-Deliverables • Unfortunately we cannot have: • Windows that open • Individual thermostats for rooms or areas. • Pressure requirements for lab vs. non lab areas. • Better temperature control maintains stable and efficient work place.

  13. Conclusion • Next step is to install the energy monitoring system. • Calculations for cost savings and research into variable frequency drives is our focus in the coming weeks. • Create a solid cost proposal we would like to meet again with you and Facilities Management to go over our ideas.

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