Heat & Insulation
True or False: The thermal boundary is the boundary between the inside of a house and the outside environment
False
If a house has an attached garage, the connection between the house and the garage should always be sealed first. Why?
Occupant health and safety
What is bulk moisture?
Collected water in liquid form.
Examples include rainwater through leaks in a roof or groundwater entering through basement walls and floors.
For combustion to occur, what three elements must be present?
Air/Oxygen
Fuel
Heat/Ignition source
Which branches of science govern home building performance?
Physics
Chemistry
Thermodynamics
R-Value measures ______ ________
Thermal resistance
Air pressure is measured in _____
Pascals
A family of four, through exhaling and sweating, can produce approximately how much moisture in a day?
2.5 gallons
What is the AFUE rating of a furnace with an output of 85,000 btu and an input of 90,000 btu?
94%
What is radon?
A colorless, odorless, radioactive gas that comes from the ground.
What are the three forms of heat transfer?
Conduction
Convection
Radiation
Air unintentionally flowing out of a house is called:
Exfiltration
To slow or reduce diffusion through walls, floors, and ceilings, ____ ____ ____ are used.
Vapor diffusion retarders
What are the three primary components of a central air conditioning system?
Condenser coil
Compressor
Evaporator coil
A geothermal heat pump works by exchanging heat between the home and the _____
Ground
Heat moves from ___ to ___
Air moves from ___ pressure to ___ pressure
Moisture moves from ___ to ___
Heat moves from warmer to cooler
Air moves from higher pressure to lower pressure
Moisture moves from wetter to drier
A soffit vent with no vent chute causes ______, reducing an insulation's effective r-value
Windwashing
At 90 degrees relative humidity is 70%. The temperature drops 15 degrees, and relative humidity is now at 100%. What is the dew point?
75 degrees
What is the minimum temperature your water heater should be set at? Why?
Water heaters should be set at or above 120 degrees to prevent bacteria growth inside the tank
True or false: you can swap out both a furnace and ac unit for a singular heat pump.
False.
The state of Minnesota still requires a secondary source of heat when installing heat pumps that provide both heating and cooling.
Name three types of insulation
Cellulose, Fiberglass, Vermiculite, Spray Foam, Rigid Foam Board, Wool, Hay, Polyisocyanurate
When building a box over a recessed light in the attic, why should the top of the box be made out of drywall?
Moisture mitigation
What are the four ways moisture can travel?
Gravity
Capillary Action
Diffusion
Air movement
What is the minimum level (ppm) of CO someone can be exposed to for an hour?
35 ppm
This common type of window has two moveable sashes that overlap slightly and slide up and down inside the frame
Double-hung