Midterm Environmental Systems in Engineering Question and answers already passed 2024/2025
4 views 0 purchase
Course
CLTD - Certified in Logistics
Institution
CLTD - Certified In Logistics
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....
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:
, 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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Carzola98. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
