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Midterm Environmental Systems in Engineering Question and answers already passed 2024/2025
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Midterm Environmental Systems in Engineering Question and answers already passed 2024/2025 Midterm Environmental Systems in Engineering & Architecture The movement of heat through a substance or between two substances in contact with each other is called ________. - correct answer conduction....

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  • September 15, 2024
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  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • midterm environmental systems in engineering
  • midterm environmental systems in engineering quest

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Midterm Environmental Systems in
Engineering & Architecture
The movement of heat through a substance or between two substances in
contact with each other is called ________. - correct answer ✔conduction.


Heat transfer by the motion of a fluid or gas is called _________ - correct
answer ✔convection.


Heat transfer involved by the movement of energy of electromagnetic waves
is referred to as ______________. - correct answer ✔radiation.


A black body absorbs all of the radiative energy (T/F) - correct answer ✔True


The emissivity of a surface is the ratio of radiant energy emitted by a surface
and radiant energy emitted by a black body at the same temperature (T/F) -
correct answer ✔True


Low e coatings are used on window glass to reduce infrared radiative enery
heat transfer by up to 20 times, reflecting infrared wavelengths while
transmitting most of the visible wavelengths in the solar radiation. (T/F) -
correct answer ✔True


A dull metal surface can have an emittance of less than .1 therefore releasing
very little radiation across surfaces. (T/F) - correct answer ✔False


A steel stud of a wall creates a thermal bridge enhancing heat transfer. (T/F) -
correct answer ✔True

,The R value represents the ability of a material to insulate therefore the lower
the R value the better the insulation. (T/F) - correct answer ✔False


The k value of a material indicates it thermal conductivity therefore a k value is
equal to 1/R relationship. (T/F) - correct answer ✔True


The overall coefficient of heat transmission through a wall is indicated by the
U value of the material assembly. (T/F) - correct answer ✔True


The U value of a wall is obtained by dividing 1 by the sum of R values for all
materials used in a wall. (T/F) - correct answer ✔True


Air films located on the interior and exterior surfaces of a wall constitutes
resistance to heat flow. (T/F) - correct answer ✔True


Based upon Table 2.6, the resistance of the outside air film with a 15 mph
wind is .03 imperial units. (T/F) - correct answer ✔False


Refer to Table 2.4 the resistance of brick face 4" thick is 0.44. (T/F) - correct
answer ✔True


Determine the total R value for the following wall:


Outside Air Film with 15 mph wind (table 2.6)


Brick face 4" veneer (Table 2.4)


3/4 sheathing polyisocyanurate insul board foil faced two sides (Table 2.4)

, 3/4" air space Winter application with reflective surface ε = .03 (Table 2.7)


6" fiberglass batt insulation


Gypsum wall board ½" thick (Table 2.4)


Inside Air Film non reflective surface-interior wall surface (Table 2.5) - correct
answer ✔28.44


Determine the total R value of the following assembly:


Wood Floor System


Inside Air Film - Non Reflective Surface-winter


¾" wood sub floor OSB or plywood


Carpet fibrous pad


6" batt insulation


Outside Air Film - 7.5 mph wind


Total R for Floor - correct answer ✔23.03

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