education building mechanical controls redesign · 2020-03-31 · education building mechanical...
TRANSCRIPT
EDUCATION BUILDING MECHANICAL CONTROLS REDESIGN
Group 3
Jay Brockmann
Luke Deobald
Tanner Deobald
Dacey Schentag
Overview
Project Description Common Language Energy Saving Alternatives Alternative Evaluation Final Design Cost Estimate Conclusions Recommendations
(Rootsweb.ancestry, 2013)
Project Description
Client: U of S Office of Sustainability Objectives:
Analyze energy usage Assess improvements 15% energy reduction
Constraints: Use existing equipment Delta Controls Codes/Standards
(CopperTree Analytics, 2015)
Common Language
HVAC: Heating, Ventilation, and Air Conditioning Mechanical Control System Dual Duct System
Hot Deck Cold Deck Outdoor Air Return Air Mixed Air Exhaust Air
Current System
Four Separate HVAC Zones: Audio/Visual Room Quance Theatre Gym, Locker Rooms, Pool Penthouse/Main System
Energy Saving Alternatives
Filter/Pressure Sensors Enthalpy Sensors CO2 Sensors Nighttime Purge Optimum Start Set Point Adjustment Hydronics
Filter/Pressure Sensors
Pressure sensors across filters connected to alarms Lower the set point on the alarms in order to change
the filters more regularly Leads to reduced fan load Reduced energy consumption
Enthalpy Sensors
Add sensors in strategic locations Accounts for humidity Heat/cool the air more effectively High efficiency system
CO2 Sensors
Add sensors in areas with large occupancy Accounts for number of people Adjusts temperature based on CO2 sensors Less wasted energy
Nighttime Purge
Open outside air dampers Delay operation of A/C Relevant during summer months
(Sustainability Workshop, 2011)
Optimum Start
Delay HVAC start-up Based on outdoor air conditions Easy implementation
14
15
16
17
18
19
20
21
22
23
4:00 4:30 5:00 5:30 6:00 6:30 7:00 7:30 8:00
Tem
pera
ture
(⁰C)
Time (a.m.)
Current
OptimumEnergy Savings
Set Point Adjustment
Temperature: Hot Deck Cold Deck Mixed Air
Airflow: Hot Deck Cold Deck
Mixed Air (Achr News, 2012)
Alternative Evaluation
Alternatives Implementing Cost (10)
Maintenance (10)
Potential Savings (x3)
Difficulty of Analysis (.5)
Availability of Data (Pass/Fail)
Total
Filter/Pressure Sensors 8 3 3 7 Pass 27Enthalpy 4 3 3 5 Pass 21CO2 Sensors 3 8 6 5 Pass 34Nighttime Purge 9 6 8 7 Pass 46Optimum Start 9 9 7 7 Pass 46Set Point Adjustment 10 10 8 7 Pass 51Hydronics System N/A N/A N/A N/A FAIL N/A
Final Design - Penthouse
Model of current HVAC system 7,143 GJ annual HVAC energy consumption
51.39
39.11
9.50
0
20
40
60
80
100
120
% o
f A
nnua
l Ene
rgy
Con
sum
ptio
n
Penthouse Energy Usage
CoolingHeatingFan Power
Final Design - Penthouse
Set Point Adjustment 2⁰C change yields 561.44 GJ reduction (7.86%)
0.00
2.00
4.00
6.00
8.00
10.00
0 1 2% R
educ
tion
in A
nnua
l En
ergy
Change in Set Points (°C)
Set Point Adjustment Energy Reduction
Final Design - Penthouse
Nighttime Purge July and August Run fans 2 hours Delay HVAC until 11:00 am 22.96 GJ annual energy reduction (0.32%)
Final Design - Penthouse
Optimum Start Maximum conditioning time of 2 hours Start time based on outdoor air temperature 443.32 GJ annual energy reduction (6.21%)
Cost Estimate
Project Cost
Cost Implementing Alternatives
Alternative Hours Rate Cost
Set Point Adjustment 2.5 $150.00 $375.00
Optimum Start 1 $150.00 $150.00
Nighttime Purge 1 $150.00 $150.00
Total 4.5 $150.00 $675.00
Cost Group Design
Group 3 344 $116.00 $39,904.00
Total Cost $40,579.00
Conclusion
7.86
6.21
0.32
0.002.004.006.008.00
10.0012.0014.0016.00
% R
educ
tion
in A
nnua
l En
ergy
Con
sum
ptio
n
Reduction in Energy Consumption
Nighttime Purge
Optimal Start
2 Degree SetpointAdjustment
• 14.39% total annual HVAC energy reduction
Recommendations
Apply alternatives to gym, locker rooms, pool CO2 sensor in gym Improved heat recovery schedule Optimum start in Quance Theatre Increased set point adjustment
Acknowledgements
Darell Hart, Safety Consultant Margret Asmuss, Sustainability Coordinator Kathryn Theede, P. Eng., Energy & Emissions Officer Ken Coutu, P. Eng, Faculty Advisor
Questions?
References
http://sustainabilityworkshop.autodesk.com/buildings/night-purge-ventilation
www.coppertreeanalytics.com www.achrnews.com www.rootsweb.ancestry.com