Objectives Talk about the final projects Guest Speaker Discuss HW2 and HW3 problems

Guest Speaker Amanda Berens Energy Steward, Facilities Maintenance The University of Texas at Austin

Energy Utilization Index Projected to

»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)

»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

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

»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

Building Automation - Hot/Cold Deck Resets

»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

»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

»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

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 it to me till March 26 th Visit me in my office in-between March 26 th and April 4 th

HW 2 Design problem 3: problems 8.27 and 8. 28

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