NCARB PDD NCARB Building Systems Exam Study Questions with Answers
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Course
NCARB
Institution
NCARB
British Thermal Unit - Answer a measure of energy, typically noted as the amount of
energy
needed to raise one pound of water by 1˚ F, raise 1 pint of water by 1˚ F , burn one
match
Coefficient of Heat Transmission (U-value): - Answer overall rate of heat flow through
any
combination of mat...
NCARB PDD NCARB Building Systems Exam
Study Questions with Answers
British Thermal Unit - Answer a measure of energy, typically noted as the amount of
energy
needed to raise one pound of water by 1˚ F, raise 1 pint of water by 1˚ F , burn one
match
Coefficient of Heat Transmission (U-value): - Answer overall rate of heat flow through
any
combination of materials, used for determining the size of heating system.
Conductance (C) - Answer BTU/Hr that pass through 1 ft2 of material of a given
thickness when the change in temperature is 1 ºF
Thermal Conductivity (k) - Answer ability of a material to transmit or conduct heat or
electricity
based on the physical properties of the material, expressed in BTU
Conductivity (k/in) - Answer BTU/hr that pass through a 1 ft2 of material 1" thick when
the
change in temperature is 1 ºF
Emissivity (ε) - Answer the measure of an object's ability to absorb and then radiate heat
Emittance: - Answer the energy radiated by the surface of a body person per unit area
,Resistance (R) - Answer number of hours needed for 1 BTU to pass through 1 ft2 of
material or
assembly of a given thickness when the change in temperature is 1 ºF
Latent Heat - Answer heat required to convert a solid into a liquid or vapor, or a liquid
into a vapor, without change of temperature, given in BTU
Sensible Heat - Answer amount of energy released or absorbed by a chemical substance
during a change of temperature, changes the temperature but not the state, given in
BTU
Specific Heat - Answer the amount of energy required to raise the temperature of a
material by 1 ºF, the capacity to store heat, given in BTU
Heat of Vaporization - Answer heat given off by a vapor condensing to liquid, or the heat
absorbed by a liquid evaporating to a gas without a change in temperature
Relative Humidity - Answer ratio of moisture content of the air to the max possible
moisture
content at the same temperature
Enthalpy (H) - Answer total heat loss in a substance (latent heat + sensible heat), given
in BTU
Radiation - Answer the transfer of heat between surfaces that are not in direct contact
Conduction - Answer the transfer of heat between two objects that are in direct contact
,Convection - Answer the transfer of heat that requires a fluid medium like air to transfer
(also, directions like up/down/sideways matters)
Evaporation - Answer liquid is absorbed into the air as latent heat
Warmth - Answer the quality, state, or sensation of being warm, moderate and
comfortable heat
Coolth - Answer pleasantly low temperature
Clo - Answer amount of insulation which will maintain normal skin temperature of the
human body, 1 Clo is the equivalent of a typical American man's suit in 1941.
The standard amount of insulation required to keep a resting person warm in a windless
room at 70º F is equal to 1 col.
• .8 clo: winter dressing, sweaters and other warm stuff
• .4 clo: summer dressing, shorts and tank tops
Thermal Comfort - Answer the state of mind that expresses satisfaction with the
surrounding
environment
Degree Day (DD) - Answer the average yearly difference between the indoor
temperature and outdoor temperature. Typically a reference temperature of 65 ºF is
used
Design Day - Answer used to design and size a heating system that determines the day
cooler than 98% of all days in the year experience in a climate
, Dry Bulb Temperature definision - Answer typically referred to as air temperature, it's
what people are
referring to when the talk about the temperature. It's an indicator of heat content and
measured by a common thermometer, given in ºF
Wet Bulb Temperature - Answer the lowest temperature that can be reached under
current
ambient conditions by the evaporation of water only, given in ºF
Dew Point (T) - Answer the temperature at which water vapor starts to condenses out of
the air. Above this temperature the moisture will stay in the air, given in ºF
Comfort Zone - Answer the range of temperatures and humidities in which most people
feel comfortable when dressed in typical indoor clothing & engaged in typical indoor
activities
Air Changes Per Hour (ACH - Answer a rough estimate of how much whole
room/building air is
replace by outdoor air per hour
Mean Daily Range - Answer average temperature swing from night to day
Mean Radiant Temperature (MRT) - Answer the average radiant temperature of your
surroundings and is independent of air temperature (e.g.: when you ski it's cold out but
you're warm from the sun and exercise)
Barometer - Answer an instrument for measuring atmospheric pressure
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