ME 414 HVAC Project
Michael Stark
Joshua Keith
Billy Burdette
Brandon Mullen
Joseph Listerman
Natural Gas Consumption
1
Develop A Charter

Why Statement
 Business case – What is the project purpose?
• Reduce cost of heating the studied household
• Obtain a better understand of the HVAC process and analysis
• Scope of data and calculations involved
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Types of Process Maps

Detailed Process Map
 Effectively shows input and outputs
 Includes parties effected by the process

Flow-Chart Process Map
 Excellent method for visually envisioning a process
 Visually displays outcomes dependent on situations
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SIPOC Process Map
Supplier
Input
Process
Output
Customer
Homeowner
Set desired temperature
Adjust Thermostat
Turn furnace on/off
Homeowner
Homeowner
Remove old filter, insert new filter
Change furnace filter
Reduced resistance to air flow
Homeowner
Insulation Contractor
Add insulation to walls and ceiling,
increase R value
Improve Insulation
Decreased heat loss
Homeowner
Homeowner
Caulking, replace door and window
seals
Seal doors and windows
Decreased heat loss
Homeowner
Homeowner
Set desired temperatures and
times
Program temperature cycling
Moderate gas consumption during
off-peak hours
Homeowner
Mite - E - Ducts
Vacuum duct work
Clean ducts
Improved air flow
Homeowner
Furnace
Thermostat turns furnace on
Burning Gas
Fuel is consumed
Homeowner
Gas bill
Fuel burning
Measure volume of fuel consumed
Heat usage in therms
Homeowner
Temperature Sensor
Record time furnace is running
Measure heat generation by
furnace
Amount of fuel used to maintain
inside temperature
Homeowner
Prof. Toksoy
A file
Measure heat gen. from other
sources
Contribution of electrical appliances
to interior temp.
Homeowner
Temperature Sensor
Voltage
Measure Outside Temp.
Rate of heat loss due to
temperature difference
Homeowner
Homeowner
Hot water usage, shower, cleaning,
washer, dishwasher...
Measure fuel consumption by
water heater
Amount of fuel volume not used
for heating
Homeowner
Homeowner
Turn the stove knob on
Measure fuel consumption by stove
Amount of fuel volume not used
for heating
Homeowner
ME 414 – 6S Approach
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Flow-Chart Process Map
ME 414 – 6S Approach
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Critical Parameter Management

Defines energy
consumption in household
 Where energy is distributed in
house

Shows locations of heat
loads in a household
 Supplemental heat production

Allows analysis of heat load
paths in the household
 Shows several different paths
in one figure
ME 414 – 6S Approach
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Critical Parameter Map
ME 414 – 6S Approach
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Critical Parameter Map Continued
ME 414 – 6S Approach
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Measure

Measurements
Household Measurements
 Rooms:
•
•
•
•
•
Dimensions
Windows
Doors
Height
Floor Area

Furnace on time measurement
 HVAC register outlet temp

Outside Temperature
 Measured LM34 temperature sensor
 HIH4000 Humidity sensor
 LTC1298 A/D converter
This is a Header
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HVAC Register Outlet Temp
12
House Layout
First
Floor
Basement Floor
Second Floor
ME 414 – 6S Approach
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Heat Loss Analysis Assumptions

Basement floor temperature
is assumed to be 55°F

Ground temperature data
taken from ground chart at
right.

Basement is an underground
room with window wells.

Windows are exposed to
outdoor temperatures.
ME 414 – 6S Approach
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Heat Transfer Surfaces

The chart below displays the percent total area where
heat loss occurs for three primary types of surfaces.
Areas in House
92%
Walls
Windows
Doors
1%
ME 414 – 6S Approach
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7%
17
HDD Calculated vs. Published
HDD Calculated vs. Published
60
Published HDD (°C)
50
40
y = 0.9398x + 1.973
R² = 0.9902
30
20
10
0
25
30
35
40
45
50
55
Calculated HDD (°C)
ME 414 – 6S Approach
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Calculated Data
Furnace On Time vs. Calculated HDD
4.50
4.00
Furnace On Time (hours)
3.50
3.00
y = 0.0686x + 0.4187
R² = 0.587
2.50
2.00
1.50
1.00
0.50
0.00
25
30
35
40
45
50
55
Calculated HDD (°C)
ME 414 – 6S Approach
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Calculated Data
Furnace On Time vs. Published HDD
4.50
4.00
Furnace On Time (hours)
3.50
y = 0.0715x + 0.3328
R² = 0.5689
3.00
2.50
2.00
1.50
1.00
0.50
0.00
25
30
35
40
45
50
55
Published HDD (°C)
ME 414 – 6S Approach
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Calculated Data
Number of On - Off Cycles
70
60
50
40
30
20
10
0
40200
40206
40207
40212
Calculated # of On - Off cycles
ME 414 – 6S Approach
40213
40214
40215
Plotted # of On - Off cycles
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Total Heat Loss on Sampled Days
Total heat loss (watts) per day
14000
12000
10000
8000
6000
4000
2000
0
40200
40206
40207
40212
40213
40214
40215
Data
ME 414 – 6S Approach
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Total Heat Loss over 7 days

Percent total heat loss for
each of the three primary
surfaces in the house.
 Notice this is not
proportional to the
total areas where heat
transfer occurs.
 The walls comprised
90% of the heat
transfer area, but just
over 50% of the total
losses.
ME 414 – 6S Approach
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