Transcript TDV Workshop Presentation Dec 14, 2000

Residential TDV HVAC
Progress
Bruce Wilcox
Berkeley Solar Group
for
Pacific Gas & Electric Co.
Codes & Standards Program
TDV Project
Copyrighted © 2000 PG&E All Rights Reserved
Residential TDV Progress




FSEC 3.0 Duct Simulations
Duct Efficiency Simulation Model
Hourly Residential Cooling Model
Implemented for Review
• Excel Spreadsheet
• Micropas Hourly Output File
TDV Project
Copyrighted © 2000 PG&E All Rights Reserved
FSEC 3.0 Duct Simulations

Detailed State of the art calculations for
ducts in attic used by ASHRAE TC6.3

Using ASHRAE Prototype House

Simulating CEC duct/Attic Cases

Simulations Fresno, Palm Springs,
Oakland, San Diego, Pasadena, Riverside,
Sacramento
TDV Project
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Simulation Results
Comparison of Seasonal Distribution Efficiency
FSEC 3.0
CEC ACM
Zone
Sealed
Unsealed Sealed
Unsealed
3
0.94
0.82
0.85
0.79
7
0.93
0.79
0.88
0.82
9
0.92
0.74
0.84
0.76
10
0.89
0.72
0.82
0.73
13
0.87
0.71
0.81
0.72
15
0.80
0.41
0.76
0.64
TDV Project
Copyrighted © 2000 PG&E All Rights Reserved
Duct Efficiency Simulation Model
Normalized Cooling Distributi on Efficiency =
a0 + a1 (To - Tz ,bc ) + a 2 I h + a3 (To - Tz ,bc ) + a 4 I h + a5 (To - Tz ,bc )I h
2
2
where
To = Outdoor air dry - bulb temperatu re, Celsius
Tz,bc = Base case indoor zone temperatu re, Celsius
I h = Global horizontal insolation , Wh/m 2
TDV Project
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Simulation Results
Sacramento Unsealed Ducts: July 21
1.4
3000
1.2
2500
1.0
2000
0.8
1500
0.6
1000
0.4
500
0.2
0
0.0
Hour of Year
TDV Project
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4847
4846
4845
4844
4843
4842
4841
4840
4839
4838
4837
4836
4835
4834
4833
4832
4831
4830
4829
4828
4827
4826
4825
4824
Wh
3500
BaseCase Energy: Cooling
Predicted Cooling Energy (Wh)
Energy: Cooling
Predicted Normalized DE, Cooling
Normalized DE, Cooling
Model Accuracy
Sealed Ducts 95% Confidence Interval Error in Predicting DE
Entire Data Set
-8%
8%
Climate Zone 3
-2%
8%
Climate Zone 12
-3%
4%
Climate Zone 13
-5%
4%
Climate Zone 15
-9%
7%
TDV Project
Copyrighted © 2000 PG&E All Rights Reserved
Hourly Residential Cooling
Simulation


Start with Micropas Hourly results
Adjust hourly for
• Duct Efficiency
• EER Impact of Outdoor Temperature
• EER Impact of Part Load

Apply TDV Energy Prices
TDV Project
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Cooling Model
TDV Cooling Factors
7
kW Multiplier
6
5
Duct
4
PLR
3
Temp
2
Combined
1
0
71
5
78
7
89
9
95
11
104 104
13
15
102
17
95
19
Outdoor Tem perature / Hour
TDV Project
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86
21
80
23
Cooling Model
TDV Cooling Hourly results
7000
6000
Watts
5000
4000
Constant
3000
TDV
2000
1000
0
71
5
78
7
89
9
95
11
104 104 102
13 15 17
95
19
Outdoor Tem perature / Hour
TDV Project
Copyrighted © 2000 PG&E All Rights Reserved
86
21
80
23
Cooling Model
TDV Cooling Hourly Results
500
450
400
$, PV
350
300
250
200
150
100
50
0
6
7
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1
Hour
TDV Project
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Future Model Work


Review of current Model
Other model additions
•
•
•
•

Radiant Barriers
Heating Ducts
Heat Pumps
Domestic Hot Water
Integrate into Micropas and CALRES
TDV Project
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