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
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Goals

Calculate HDD

Furnace on time

Number of on-off cycles

Heat Loss

Correlate Data
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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
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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
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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
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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
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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
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R - Values
Walls (Brick)
5.63
Walls (Cedar)
5.94
Windows
2.00
Doors
1.00
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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
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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
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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.
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