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Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
1
Inferential Control – An Advanced
Control Strategy to Save Energy in
Residential Heating Systems
by
Dr. Surinder Jassar, P.Eng.
Dr. Zaiyi Liao, P.Eng. Dr. Tarsem Sharma, P.Eng.
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Outline
Objectives
Residential Heating Systems – Current control practices
Inferential Control Scheme
Testing Results
Conclusion
2
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Objectives of the Study
To investigate the current control practices for space heating
systems in Canada.
To design and develop an advanced control strategy for
improving the performance of the buildings including thermal
comfort and energy efficiency.
To test the performance of the inferential control scheme for a
forced warm-air heating system in a simulation environment.
3
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Building Automation
Issues
4
Target for improvement
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Factors affecting energy efficiency and thermal
comfort
Thermal performance of the building envelope
The energy efficiency of the furnaces
Self-programmable thermostats with temperature set-
back capabilities
Performance of control systems
5
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Control of Heating
Systems
6
Residential Heating Systems – Current control
practices
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Current control practices: Survey conducted in
Ontario
Survey Conducted in
Winter 2008/2009
20% dissatisfied
with room
temperature in
winter
36% feel overheating
27% feel overcooling
1. Large energy consumption
2. Lower thermal comfort
7
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Proposed Control Method: Inferential Control
Scheme
8
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Different Control Schemes and Test Conditions
Type 1: Single Zone
Type 2: Zoned Control Scheme
Type 3: Inferential Control Scheme
Test conditions:
1. Climatic data for Toronto
2. January 1st to March 31st and October 1st to December
31st
3. Daily climatic conditions are described by the HDH
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Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Test Conditions
4. HDH for Toronto for the Year of 2008
5. Desired Temperature Schedule for Single-Zone
10
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Test Conditions
6. Desired Temperature Schedule for Multi-Zone
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Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Testing Results: Temperature
12
6860 6865 6870 6875 6880 6885 689019
20
21
22
23
24
25
26
Time ( Hour of the Year )
Avera
ge A
ir T
em
pera
ture
( D
eg C
)
Low Heating Load: Oct. 13 (HDH=21.4 0C.Hr)
Desired Temperature
Single Zone Control
Zoned Control
Inferential Control
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Testing Results: Heating Energy Consumption
(MJ)
Single Zone Control Method: 12%
Zoned Control Method: 14.5%
13
Month Single Zone Control Zoned Control Inferential Control
January 19983 20186 17923
February 17212 17921 15402
March 16692 17012 14320
October 10127 11121 9010
November 13721 14000 12215
December 16724 16985 14220
Total 94459 97225 83090
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
14
Testing Results: Thermal Comfort
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning
Inferential control scheme compared
The temperature extremes, either higher or lower than
the set-point, are lesser as compared to the conventional
single-zone control method.
The energy consumption is low.
Zoned control method when compared to proposed
control strategy, temperature variations are less and
energy consumption is high.
15
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning 16
Dr. Surinder Jassar, P.Eng.
School of Applied Technology
Humber Institute of Technology and Advanced Learning 17
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