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Objectives Talk about the final projects Guest Speaker Discuss HW2 and HW3 problems
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Guest Speaker Amanda Berens Energy Steward, Facilities Maintenance The University of Texas at Austin
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Energy Utilization Index Projected to 2020 4
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»The “Dirty 30” Annual Energy Use »($1,384,000) Fuel Rate Only »($3,214,000) Fully Burdened » ($732,000) »($1,691,000) » ($610,000) »($1,436,000)
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»Energy Conservation Measures »Technical HVAC Scheduling Hot deck & cold deck resets Lab ventilation air change reduction General maintenance Building optimization »Behavioral Lights out campaign UTake Charge Challenge Lab equipment Events
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Overview of Hot/Cold Deck Operation 7 »Return Air »Cooling Coil »Supply Air »Heating Coil »Hot Deck »Cold Deck »Mixin g Box »To Office » T» T » T» T » T» T »Return & OA Air
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»Problem #1 – Hot Deck Reset Savings »Calculate steam consumption reduction over a year due to hot deck reset adjustments. »Given: Assume a 10,000 CFM Dual Duct AHU system Original hot deck temp set point = 120 o F New hot deck temp set point = 95 o F
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Building Automation - Hot/Cold Deck Resets
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»Problem #2 – Lab Ventilation Reductions »Calculate the reduction in chilled water consumption when a lab air change rate is reduced from 12 to 6 ACH. »Given: Assume 10,000 CFM Dual Duct 100 % OA AHU Laboratory room volume Assume 5 labs with 2,000 CFM of supply and exhaust air
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»Problem #2 – Lab Ventilation Reductions »2,000 CFM of OA »2,000 CFM »400 CFM »600 CFM »400 CFM »2,000 CFM »1,000 CFM
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»Problem #3 – Increase lab exhaust capacity »ETC has run out of exhaust capacity. Based on design drawings and actual condition, how can we adapt the building to provide exhaust for a new research on the 9 th floor? »Options: Reduce hood exhaust rate at existing hoods Convert exhaust system to VAV Ductless exhaust system
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Final Project Assignment During the following two classes I will introduce more project topics You will need to define your project till April 4th Define project groups -Undergraduate students group of 2 -Graduate students individual projects Prepare ½ page proposal and email it to me till March 26 th Visit me in my office in-between March 26 th and April 4 th
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HW 2 Design problem 3: problems 8.27 and 8. 28
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HW 3 Cooling Cycles Problems: 1) Book: 3.1 (page 69), 2) Book: 3.5 ((page 70), 3) Solve 3. 1 for ammonia, 4) Same like 3.5 for R22 with no intercooler 5)Book 3.9 (pages 70-71) 6)Book 3.10 (pages 70-71) Due date: March 21, 2013
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