THERMAL, HVAC, PLUMBING - ARE
STUDY EXAM QUESTIONS AND
ANSWERS 100% PASS
Psychometric chart - ANS A graphical representation of the physical and thermal properties
of moist air.
Evaporative cooling - ANS A process represented diagonally on the psychometric chart,
indicating total heat in BTU/lb of dry air.
Conduction Equation - ANS Q (BTU/hr) = U-value x Area x temperature difference.
Convection Equation - ANS Q (BTU/hr) = 1.08 x CFM x temperature difference.
k - Conductivity - ANS How well a temperature passes through a homogeneous material;
fast=high rate=conductor, slow=low rate=insulator.
r - Resistivity - ANS Rate of resisting heat transfer in a homogeneous material, inverse of
conductivity; generally want high meaning molecules are farther apart.
C - Conductance - ANS The ability of touching materials to exchange heat between two
surfaces in contact, applicable to homogeneous or heterogeneous materials of a given
thickness.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, R - resistance - ANS Inverse of conductance, calculated as R value = 1/C or r x d.
WINTER - ANS Refers to the season when the temperature difference between inside and
outside is greater.
CFM per person for ventilation - ANS 10-20 CFM, with the kiss line of maximum and outdoor
air.
Radiation - ANS A function of temperature difference, angle of view, and absorption.
Emittance - ANS A material's ability to release heat.
Emissivity - ANS The combined measure of emittance and absorption.
10 R value - ANS Typical R value of a building material.
Direct Gain space - ANS A type of passive solar gain where the floor acts as a thermal mass
that stores and radiates heat, resulting in thermal lag.
Trombe Wall - ANS A type of passive solar gain where the wall acts as a thermal mass,
trapping and releasing heat.
Sun space - ANS A type of passive solar gain that is an unconditioned buffer space not meant
to be occupied year-round, trapping and slowly releasing heat.
Evaporation - ANS The process of liquid turning to gas, which requires heat and occurs at low
pressure, resulting in a cold coolant.
Condensation - ANS The process of gas turning to liquid, which produces heat and occurs at
high pressure, resulting in a warm coolant.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
STUDY EXAM QUESTIONS AND
ANSWERS 100% PASS
Psychometric chart - ANS A graphical representation of the physical and thermal properties
of moist air.
Evaporative cooling - ANS A process represented diagonally on the psychometric chart,
indicating total heat in BTU/lb of dry air.
Conduction Equation - ANS Q (BTU/hr) = U-value x Area x temperature difference.
Convection Equation - ANS Q (BTU/hr) = 1.08 x CFM x temperature difference.
k - Conductivity - ANS How well a temperature passes through a homogeneous material;
fast=high rate=conductor, slow=low rate=insulator.
r - Resistivity - ANS Rate of resisting heat transfer in a homogeneous material, inverse of
conductivity; generally want high meaning molecules are farther apart.
C - Conductance - ANS The ability of touching materials to exchange heat between two
surfaces in contact, applicable to homogeneous or heterogeneous materials of a given
thickness.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, R - resistance - ANS Inverse of conductance, calculated as R value = 1/C or r x d.
WINTER - ANS Refers to the season when the temperature difference between inside and
outside is greater.
CFM per person for ventilation - ANS 10-20 CFM, with the kiss line of maximum and outdoor
air.
Radiation - ANS A function of temperature difference, angle of view, and absorption.
Emittance - ANS A material's ability to release heat.
Emissivity - ANS The combined measure of emittance and absorption.
10 R value - ANS Typical R value of a building material.
Direct Gain space - ANS A type of passive solar gain where the floor acts as a thermal mass
that stores and radiates heat, resulting in thermal lag.
Trombe Wall - ANS A type of passive solar gain where the wall acts as a thermal mass,
trapping and releasing heat.
Sun space - ANS A type of passive solar gain that is an unconditioned buffer space not meant
to be occupied year-round, trapping and slowly releasing heat.
Evaporation - ANS The process of liquid turning to gas, which requires heat and occurs at low
pressure, resulting in a cold coolant.
Condensation - ANS The process of gas turning to liquid, which produces heat and occurs at
high pressure, resulting in a warm coolant.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
