Objectives

• Talk about the final projects• Guest Speaker

• Discuss HW2 and HW3 problems

Guest Speaker

Amanda BerensEnergy Steward, Facilities MaintenanceThe University of Texas at Austin

Energy Utilization IndexProjected to 2020

4

»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

»Mixing Box

»To Office

» 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 oF•New hot deck temp set point = 95 oF

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»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 9th 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 email it to me till March 26th • Visit me in my office in-between March 26th and April 4th

HW 2

Design problem 3:problems 8.27 and 8. 28

 

HW 3Cooling 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