- Northwest ENERGY STAR Homes

Northwest ENERGY STAR Homes
Ventilation Presentation
Portland, OR | April 11, 2013
ASHRAE 62.2 VERIFICATION
THERE IS A MANDATE TO INSPECT & TEST
 Necessary ducting for existing fans must be properly installed to bring air into or
out of the dwelling.
 Fan controls, like the one shown at right, must be installed to insure proper run
times.
Slide content from ASHRAE 62.2 for WAP.DOE
WHY IS MEASURING AIRFLOW SO HARD?
 It’s invisible!
 Air flow in a duct is usually really turbulent; where you sense the airflow might not
the right place
30 FEET OFF THE GROUND IS NOT A GOOD PLACE TO
MEASURE AIRFLOW!
If you can’t measure it, how
is anyone going to clean it?
BASIC MATH
 Velocity (FPM) X Area (Sq..)= CFM
 Ways to detect velocity
o Hot Wire anemometer
o Pitot Tube
o Vane anemometer
HOT WIRE ANEMOMETER
VANE ANEMOMETER
EFFECTIVE AREA: AK: CORE AREA, OR ALL SORT OF THE
SAME SPECIFICATION
Gross area =
24 sq inches
or 24/144=
.17 Sq. Ft
Effective
area is
only .102
Sq Ft.
VANE ANEMOMETER WITH HOOD
FLOW HOODS DO THE MATH FOR YOU
 They still detect velocity by:
o Hot wire anometers
o Pitot tubes
o Propellers
 They also know the area
PRESSURE DROP BETWEEN TWO PLACES IN A DUCT
Mass flow in air can be calculated if you know the pressure drop across the pipe.
Then it can be calculated using Darcy's Equation for Pressure, which is:

P2-P1 = (4fLv*v)/d*2*g

where,

P2 & P1 are pressures at two points in pipe,

f = friction factor,

L= length of pipe,

v = velocity of fluid,

d = diameter of pipe,

g = gravity.
STATIC PRESSURE IN A DUCT CONVERTED TO CFM
Predicted flow rate in outside air duct (cfm)
(25' insulated flex duct and 6" wall cap)
Flex Duct Diameter (Inch)
OA duct
pressure
Pa
-5.0
-7.5
-10.0
-12.5
-15.0
-17.5
-20.0
-22.5
-25.0
-27.5
-30.0
-32.5
-35.0
-37.5
-40.0
-42.5
-45.0
-47.5
-50.0
-52.5
-55.0
-57.5
-60.0
OA duct
pressure In
H20
-0.020
-0.030
-0.040
-0.050
-0.060
-0.070
-0.080
-0.090
-0.100
-0.111
-0.121
-0.131
-0.141
-0.151
-0.161
-0.171
-0.181
-0.191
-0.201
-0.211
-0.221
-0.231
-0.241
5
6
7
8
9
32
39
45
50
55
59
63
67
71
74
78
81
84
87
89
92
95
97
100
102
104
107
109
37
45
52
59
64
69
74
79
83
87
91
95
98
102
105
108
111
114
117
120
123
126
129
53
65
75
83
91
99
105
112
118
123
129
134
139
144
149
153
157
162
166
170
174
178
182
63
76
87
97
105
113
121
127
134
140
146
151
157
162
167
171
176
180
185
189
193
197
201
66
80
91
101
110
119
126
133
140
146
152
158
164
169
174
179
184
189
193
198
202
206
210
USING A STATIC
PRESSURE PROBE…
1.
On the “Blower Side” of the R/A
filter
2.
On the “Blower Side” AC Coil (if
installed)

If only 1 SP probe, add the 2
values together
Measurements close to design
value, usually 0.5” W.C, indicate
good duct design if the blower
speed is set correctly.
PITOT TUBE KITS
VELOCITY PRESSURE + STATIC PRESSURE = TOTAL
PRESSURE
PITOT TUBE
Source: flowmeterdirectory.com
FLOW PLATE IN A
COLLECTION HOOD
 Flow Plates average the velocity
pressure over a wide area and
multiply it by the sq. ft. of the holes
PRESSURES ARE BELOW WHAT DG 700 WILL CALCULATE
Pascals
Pressure
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
36
51
63
73
81
89
96
103
109
115
121
126
131
136
141
145
150
154
159
163
EXHAUST FLOW METER (ONLY MEASURES EXHAUST)
EXHAUST FLOW METER (ONLY MEASURES EXHAUST)
FLOW HOOD (MAYBE HOT WIRE, PRESSURE GRID, PROPELLER)
WHAT'S WRONG HERE?
WHAT'S WRONG HERE?
SUPPLY SIDE VENTILATION
These systems are designed to bring in air through a duct to the outside. When operating, they turn
on the air handler, open a damper in the duct to outside. In some cases, they may turn on a remote
fan. In almost all cases, they track fan time for heating and cooling and activate only when extra
run time is needed to meet a ventilation standard.
CONTROLLERS
 Two basic types:
1.
Non-programmable (you do the math)
o April Aire
o Clock timers (supply side systems must use air handlers with EM if
these systems are used)
2.
Programmable (they do the math)
o Smart thermostats
o Honeywell W1850
o Tamarack fan controllers
APRILAIRE CONTROLLER
 Does not keep track of air handler run time;
must be used in connection with ECM air handler
SET ENVIRONMENTAL OPERATING CONDITIONS
These last two terminals must have either an outdoor temp sensor, or the blue “time only
resistor”. They can also be connected with a jumper wire. If nothing connects the two
terminals, the controller will not operate.
SET CYCLE TIME INTERVAL BY MOVING THE PINS
SET LENGTH OF CYCLE BY ROTATING FRONT DIAL
DIAL ALSO CAN BE USED TO TEST AND TO TURN OFF THE
CONTROLLER
ADJUSTING MINUTES HOUR
OUTDOOR SENSOR & TIME ONLY RESISTOR
JUMPER INSTALLED
Outdoor
Temp F
120
110
100
90
80
70
60
50
40
30
20
10
0
-10
-20
Indoor
Rh%
5
15
20
25
30
35
40
45
Operational
50
55
60
65
70
75
80 85 90 95
Non-Operational
100
“TIME ONLY RESISTOR” INSTALLED
Outdoor
Temp F
120
110
100
90
80
70
60
50
40
30
20
10
0
-10
-20
Indoor
RH%
5 15
20
25
30
35
40
45
Operationa
l
50
55
60
65
70
75
80 85 90 95 100
Non-Operational
OUTDOOR TEMP SENSOR INSTALLED
Outdoor
Temp F
120
110
100
90
80
70
60
50
40
30
20
10
0
-10
-20
Indoor
RH%
5
15
20
25
30
35
40
45
Operational
50
55
60
65
70
75
80
Non-Operational
85
90
95 100
NOTHING INSTALLED
Outdoor
Temp F
120
110
100
90
80
70
60
50
40
30
20
10
0
-10
-20
Indoor
RH%
5
15
20
25
30
35
40
45
Operational
50
55
60
65
70
75
80
Non-Operational
85
90
95 100
AIRCYCLER FR-V - KEEP TRACK OF AIR HANDLER RUN-TIME
NOTE: The FR model does not open a damper
SETTING THE FAN ON TIME
 Press the MODE key once to enter setup mode
o FAN ON will flash on the display
 To change the FAN ON time, use the INCREASE or DECREASE
buttons
o Set the number of minutes between 1 and 199, or select “un” for
unlimited operation
SETTING THE FAN OFF TIME
 To set the delay after the last heating or cooling operation, press the Mode key
again. FAN OFF will flash on the display.
 As above, set the number of minutes between 1 and 199.
 Press the Mode key one last time to return to normal operation or for the FR-V
model, proceed to VENT settings.
Note: In humid climates, the FAN OFF time should be at least 6 minutes. This avoids
moisture re-evaporation from the coil and condensation in cold supply ducts.
SETTING THE VENT TIMES
Press the MODE key until VENT ON flashes

Increase or decrease the number of minutes to open the outside air damper
when the fan is on

Press MODE again, VENT OFF will flash

Increase or decrease the number of minutes to close the damper after the
VENT ON time as elapsed
THE HONEYWELL WHOLE HOUSE VENTILATION
CONTROLLER W8150 DOES THE MATH!
THIS CONTROLLER WILL CALCULATE FAN RUN TIME NEED
TO MEET VARIOUS VENTILATION REQUIREMENTS
SET VENTILATION STANDARD
To meet ASHRAE 62.2 the
upper dip switch must be
moved to the right and the
lower dip switch to the left
FRONT SWITCH
ON: The controller will
operate the system as
programed
OVERIDE: Will turn the
system on regardless of
programing
OFF: Will not turn air
handler on, will not
open damper, it will turn
on a remote exhaust fan
SET BEDROOM, AREA AND MEASURED FLOW
RATE ON THE THREE BOTTOM DIALS
COMPLIANCE INDICATOR LIGHTS
o
Flashing Green light indicates
compliance with chosen
standard
o
Flashing Red indicates non-compliance with
chosen standard
PROGRAMMABLE EXHAUST FANS

Strong ECM fans

Efficient motors, less than
10 watts

Designed to run continually

Quiet, less than one sone
CFM SELECTION

The time switch only refers to the length of time the fan runs when a high demand
for ventilation is detected, either through a motion sensor or a manual call
SELECTION DIALS
FAN CONTROLLERS
 Airetrack TM by Tamarack
 Adjustable airflow
o
40 to 100% of fan capacity in
o
16 increments
 Built in timer
o
5 minute increments
 Boost
o
20 minutes on full
HONEYWELL TRUEIAQ
INSTALLER SETUP FOR HONEYWELL TRUEIAQ
PANASONIC SPOT ERV, “WHISPER GREEN”
CFM SETTINGS (AT .10 WC)
Speed
Exhaust (cfm)
Supply (cfm
Watts
High
40
30
24
Low
20
20
21
Speed
Exhaust (cfm)
Supply (cfm
Watts
20
20
20
21
20
10
10
17
HONEYWELL VISION PRO IAQ
HOW TO ENTER INSTALLER SET UP SCREEN
VISION PRO VENTILATION SETTINGS
ADDING SYSTEMS TOGETHER
 Two exhaust fan can be added together
 An exhaust and an ERV/HRV can be added together
 Exhaust and supply systems can not be added together
I INTEND TO FILL THESE OUT ONCE THE FINALS ARE DONE
I INTEND TO FILL THESE OUT ONCE THE FINALS ARE DONE
I INTEND TO FILL THESE OUT ONCE THE FINALS ARE DONE
THANK YOU!
For more information, contact
info@northwestenergystar.com
or call 800-539-9362