station 4 ?? temperatures and moisture moisture meters pin contact data loggers spot temperature...
TRANSCRIPT
![Page 1: Station 4 ?? Temperatures and Moisture Moisture Meters Pin Contact Data Loggers Spot Temperature Meter Thermal Imager Cautions and Safety](https://reader037.vdocuments.net/reader037/viewer/2022103122/56649ce05503460f949aa6b6/html5/thumbnails/1.jpg)
Station 4 ?? Temperatures and Moisture
Moisture MetersPinContactData Loggers
Spot Temperature MeterThermal ImagerCautions and Safety
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Measure Moisture
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Pin-Type makes pin holes extension pins available
Contact Type non-destructive reads ~ 3” through materials settings for different materials
Moisture Meters
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Preventing Mold Growth
Control the Moisture Keep relative humidity in 30–50% rangeKeep surfaces warm No leaks inside No leaks from the outsideBlock entry of moist airControl wicking
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Control Interior Moisture
Contain moisture at the source
Remove moisture with exhaust fans
Ventilate: Exchange damp indoor air with dryer outside air
De-humidification may be necessary
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Relative Humidity
Saturation of the air … at a given temperature
Water holding capacity (%) of
the air
50% RH means the air is 1/2 full
90% RH means the air can only
hold 10% more water vapor (90% full)
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FACT: Warm air can hold more
moisture than Cold air
Relative HumidityTemperature
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Raise the temperature . . . Relative Humidity Decreases
Temperature
Relative Humidity
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Relative Humidity
Temperature
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Cool closet = higher relative humidity
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Dew Point:Temperature at which air becomes completely saturated (100% RH)
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“Wet Air” “Dry Air” Different Relative Humidity of the “Air Film”
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Mold and Moisture
Materials only need to be at 85% to 90% relative humidity to support mold growth
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Mirror reached dew point in Spokane on a hot summer day
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Mirror temperature changed little, butmoisture in the air changed (high RH%)
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Preventing Mold Growth
Control the Moisture Keep relative humidity in the 30 to 50% range
Keep surfaces warm
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Important to understandcondensation
Dew Point Calculator
dpcalc.org
http://www.dpcalc.org/
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30%
Surfaces at ??0 F will be damp
??
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30%
Surfaces at 370 F will be damp
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30%
Surfaces at ?? 0 F will be damp
??
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30%
Surfaces at 460 F will be damp
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45%
Surfaces at ?? 0 F will be damp
??
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45%
Surfaces at 500 F will be damp
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??
Surfaces at ?? 0 F will be damp
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Surfaces at 550 F will be damp
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??
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Surfaces at 600 F will be damp
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Relative Humidity MonitorRelative Humidity Monitor
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Cordless Temperature and Relative Humidity Logger
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33
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MoistureGeneration
Rate
MoistureGeneration
RateMoistureRemoval
Rate
MoistureRemoval
Rate
Aim for 30% to 50 % RHAim for 30% to 50 % RH
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Moisture Dynamics
Relative Humidity:– Saturation of the air at a given temperature . . . –% of its water holding capacity
50% RH = the air is 1/2 full90% RH = the air can only hold 10% more water vapor
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RELATIVE HUMIDITY RELATIVE HUMIDITY
FACT: Warm Air Can Hold More Moisture Than Cold Air
Temperature
RelativeHumidity
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RELATIVE HUMIDITY RELATIVE HUMIDITY
Raise the air temperature and lower the relative humidity
TEMP.
R.H.
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RELATIVE HUMIDITY RELATIVE HUMIDITY
Lower the air temperature increases the relative humidity
TEMP. R.H.
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Moisture Dynamics
Dew Point:
Temperature at which air becomes completely saturated
= 100% Relative Humidity
100% full at this temperature
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Areas of High RH
COLD OUTSIDE
Buildings have Micro-climates
a/c duct, cold pipes, etc.
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Dry Bulb = 72 0FWet Bulb = 60 0FRelative Humidity = 50 %Dew Point Temp = 52 0F
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100 % R H ???
40 0F 70 0F100 % RH
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35 % R H
40 0F 70 0F
100 % RH
Outdoors Indoors
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Areas of High RH
COLD OUTSIDE
Buildings have Micro-climates
a/c duct, cold pipes, etc.
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Moisture+
Asbestos
= Double Trouble
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single pane glass indicates high moisture levelssingle pane glass indicates high moisture levels
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Leaks
Repair Plants
Breathing
Cleaning
Dishes, etc.
Ventilation
Shower
Cooking
Laundry
Exhaust Fans
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Ventilation (AC/h) VS
Indoor Relative Humidity (%)
0
20
40
60
80
100
Ventilation: Air Chances per Hour (AC/h)
I
nd
oor
Rel a
tive H
um
i dit
y
( %)
1,500 ft sq house700 F indoor temp85 % outdoor RH
300 F outside temp typical moisture load
.35 AC/h
based on G. Tsongas
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Ventilation (AC/h) VS
Indoor Relative Humidity (%)
0
20
40
60
80
100
Ventilation: Air Chances per Hour (AC/h)
I
nd
oor
Rel a
tive H
um
i dit
y
( %)
1,500 ft sq house700 F indoor temp85 % outdoor RH 500 F outside temp
typical moisture load
.35 AC/h
based on G. Tsongas
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Ventilation (AC/h) VS
Indoor Relative Humidity (%)
0
20
40
60
80
100
Ventilation: Air Chances per Hour (AC/h)
I
nd
oor
Rel a
tive H
um
i dit
y
( %)
1,500 ft sq house700 F indoor temp85 % outdoor RH
300 F outside temp typical moisture load 2 X moisture load
500 F outside temp typical moisture load 2 X moisture load
.35 AC/h
based on G. Tsongas
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Good News for energy & comfortWhen it’s cold outside: do not need as much air exchange
When it’s mild outside: need more exchange
Drying Potential of Outside Air:
The colder the outside air, the more drying effect when this air is warmed inside
Warm, humid air has much less drying potential (can cause problems)
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“Hot” household iron with half painted black ? which side is the black side?
+ 215 oF
+ 96 oF
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2 pennies placed on hot household iron
Note the temperature reading of the penny painted flat black . . + 215.6 oF
note the temperature reading of the shiny iron surface
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Same Thermograph…Note the temperature of the shiny penny … do you really believe + 86.6 oF ??
Want to pick it up to find out? Also note the temperature reading of the shiny iron surface
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$7,500 BBQ Gas Gauge