HVAC

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HVAC Project
ME 414 – Thermal Fluid System Design
Professor John Toksoy
Final Project
Team Members:
Kaela Hlaulani
Prince Bedell
William Broaddus
Derek Vleck
Trever Zike
Seth Simonson
CUMMINS CONFIDENTIAL
Goals

Calculate HDD

Furnace on time

Number of on-off cycles

Heat Loss

Correlate Data
CUMMINS CONFIDENTIAL
HDD & Furnace On Time
Date
HDD
HDD
Calculated Actual
% Error
Furnace
on Time
# of On-Off
Cycles
Calculated
# of onoff
Cycles
Seen on
Graph
Difference
Btwn Calc
and Graph
1/22
31.93
30.0
6.04%
2.24
29
29
0
1/28
49.39
48.0
2.81%
2.04
51
51
0
1/29
50.79
50.0
1.56%
2.65
59
59
0
2/3
37.98
37.0
2.58%
1.42
33
33
0
2/4
35.68
35.0
1.91%
1.72
48
48
0
2/5
37.39
32.0
14.4%
1.79
57
57
0
2/6
46.11
41.0
11.1%
1.43
50
50
0
CUMMINS CONFIDENTIAL
HDD Calculated Vs. HDD Published
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Furnace On Time Vs. HDD Calculated
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Furnace On Time Vs. HDD Published
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On – Off Cycles
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Calculated On/Off Cycles Vs.
Observed
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First Floor Areas (ft.2)
Walls
Windows
Doors
Total
North
288.41
117.55
20.45
426.4
South
386.53
131.22
20.25
538.0
East
360.23
0
18.17
378.4
West
289.71
0
0
289.71
CUMMINS CONFIDENTIAL
Second Floor Areas (ft.2)
Walls
Windows
Doors
Total
North
499.94
75.71
0
575.65
South
346.79
16.40
0
363.20
East
371.72
0
0
371.72
West
162.50
0
0
162.50
CUMMINS CONFIDENTIAL
Basement Areas (ft.2)
Walls
Windows
Doors
Total
North
142.29
0
0
142.29
South
263.42
0
0
263.42
East
291.13
0
0
291.13
West
157.25
0
0
157.25
CUMMINS CONFIDENTIAL
House Total (ft.2)
Walls
Windows
Doors
Total
North
930.64
193.25
20.45
1144.34
South
996.74
147.62
20.25
1164.61
East
1023.08
0
18.17
1041.24
West
805.90
0
0
805.90
Walls (cedar)
Walls (brick)
1310.57
1342.80
CUMMINS CONFIDENTIAL
R - Values
Walls (Brick)
5.63
Walls (Cedar)
5.94
Windows
2.00
Doors
1.00
CUMMINS CONFIDENTIAL
Heat Losses
Date
Avg. TOut
Delta
T
Wall
Heat
Loss
Window
Heat
Loss
Door
Heat
Loss
Total
Heat
Loss
1/22
1.64
17.74
8144.70
3023.40
1044.24
12212.35
1/28
-9.22
27.44
12598.8
5
4050.78
1615.31
18264.94
1/29
-9.61
28.22
12956.30
2082.85
1661.14
16700.30
2/3
-2.15
21.10
9686.77
1557.24
1241.95
12485.96
2/4
-0.50
19.82
9101.74
1463.19
1166.95
11731.87
2/5
0.19
20.77
9538.45
1533.39
1222.94
12294.79
2/6
-5.14
25.61
11760.62
1890.64
1507.84
15159.10
CUMMINS CONFIDENTIAL
House Heat Loss
Month
Heat Loss
Heat Loss
Therms/mo BTU/day
BTU/hr
nth
Therms/da
Therms/mo
BTU/month
y
nth
December
10321.10
76.79
247706.40
2.48
7678898.40
76.79
January
12744.70
94.82
305872.80
3.06
9482056.80
94.82
February
10613.50
71.32
254724
2.55
7132272
71.32
March
5220.50
38.84
125292
1.25
3884052
38.84
CUMMINS CONFIDENTIAL
Conclusion

HDD calculated vs. HDD published strong correlation and
minimal error.

Excel program was modified to yield accurate furnace
on/off calculations

Furnace on time vs. HDD & calculated vs. HDD published
showed a poor correlation.

House Heat loss calculations yielded reasonable results.
CUMMINS CONFIDENTIAL
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