Thermal, Hvac, Plumbing Study Exam Questions and Answers | Updated 2026 | Guaranteed Success

Thermal, Hvac, Plumbing Study Exam Questions and Answers | Updated 2026 | Guaranteed Success Psychometric chart - answer-A graphical representation of the physical and thermal properties of moist air. Evaporative cooling - answer-A process represented diagonally on the psychometric chart, indicating total heat in BTU/lb of dry air. Conduction Equation - answer-Q (BTU/hr) = U-value x Area x temperature difference. Convection Equation - answer-Q (BTU/hr) = 1.08 x CFM x temperature difference. k - Conductivity - answer-How well a temperature passes through a homogeneous material; fast=high rate=conductor, slow=low rate=insulator. r - Resistivity - answer-Rate of resisting heat transfer in a homogeneous material, inverse of conductivity; generally want high meaning molecules are farther apart. C - Conductance - answer-The ability of touching materials to exchange heat between two surfaces in contact, applicable to homogeneous or heterogeneous materials of a given thickness. R - resistance - answer-Inverse of conductance, calculated as R value = 1/C or r x d. WINTER - answer-Refers to the season when the temperature difference between inside and outside is greater.CFM per person for ventilation - answer-10-20 CFM, with the kiss line of maximum and outdoor air. Radiation - answer-A function of temperature difference, angle of view, and absorption. Emittance - answer-A material's ability to release heat. Emissivity - answer-The combined measure of emittance and absorption. 10 R value - answer-Typical R value of a building material. Direct Gain space - answer-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 - answer-A type of passive solar gain where the wall acts as a thermal mass, trapping and releasing heat. Sun space - answer-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 - answer-The process of liquid turning to gas, which requires heat and occurs at low pressure, resulting in a cold coolant.