100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
NATE Air Conditioning and Heat Pump Questions and Answers | Latest Update $13.79   Add to cart
Quickly navigate to
Preview
  2.  
  3. NATE
  4.  
  5. NATE

Exam (elaborations)

NATE Air Conditioning and Heat Pump Questions and Answers | Latest Update
 5 views  0 purchase
  • Course
  • NATE
  • Institution
  • NATE

Which of the following factors affects a customers level of comfort? All of the above A cooling load calculation estimates the sensible heat gain of the structure. The cooling-only system should be within _____% of this calculated value. +15% The maximum sensible cooling capacity of a heat ...

[Show more]

Preview 4 out of 40  pages

Document information

  • September 27, 2024
  • 40
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • nate air conditioning and heat pump questions and
  • which of the following factors affects a customers

Written for

  • NATE
  • NATE

Seller

avatar-seller
Latestupdate

Reviews received

Content preview

2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!

NATE Air Conditioning and Heat Pump
Questions and Answers | Latest Update
Which of the following factors affects a customers level of comfort?


✓ All of the above




A cooling load calculation estimates the sensible heat gain of the structure. The cooling-only

system should be within _____% of this calculated value.


✓ +15%




The maximum sensible cooling capacity of a heat pump should be within ______% of the

calculated sensible heat gain of a structure with a large heating load.


✓ +25%




The combined output of a heatpump and its auxiliary heat should not exceed the calculated

heat loss of a home by more than ____%.


✓ 15%




What amount of auxiliary electronic heat is needed when the output of a heat pump on a

design day equals 18,800 Btuh and the heat loss of a home is 29,700 Btuh?




1 | P a g e | G r a d e A + | 2 0 0 2 5

,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
✓ 3.2 kWh




The three processes that transfer heat energy are conduction, convection, and _________.


✓ Radiation




Heat transfer that occurs when substances of different temperatures are in contact with

each other is called _______.


✓ conduction




What effect does raising the pressure in a sealed system have on refrigerant?


✓ The boiling point increases




What is the primary danger to people near an accidental refrigerant release or spill?


✓ suffocation caused by the heavier refrigerant displacing oxygen in the air




The maximum temperature at which refrigerant may be stored is ______ F when the

container is no more than ____% full of liquid by volume.;


✓ 125 F, 80%




1 | P a g e | G r a d e A + | 2 0 0 2 5

,2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!
Boiling of the refrigerant occurs in which system component?


✓ Evaporator




Why is superheat necessary in a system that utilizes hermetic compressors


✓ It ensures that dry vapor reaches the compressor so that mechanical

damage does not occur




When the heat load on an evaporator increases, what is the effect on the system?


✓ Suction pressure and discharge pressure both increase




What type of energy is transferred when work is done in the condenser?


✓ Both latent and sensible heat energy




What is the primary function performed by a thermal expansion valve?


✓ It maintains the correct superheat in the suction vapor leaving the

evaporator




Which component pumps refrigerant through the system and raises the vapor temperature?


✓ compressor


1 | P a g e | G r a d e A + | 2 0 0 2 5

, 2024/ 2025 | © copyright | This work may not be copied for profit gain Excel!


How are hermetic compressor motors cooled?


✓ With suction vapor drawn from the evaporator




Heat pump compressors sometimes run hotter than compressors used in cooling-only units

because heat pump compressors _____.


✓ exhibit low refrigerant density at low suction pressures during the

heating cycle




When is crankcase heat most needed?


✓ When the compressor is off




Work done on the refrigerant in the condenser is transferred as ____.


✓ Both sensible and latent heat




Why are more circuits needed in the outdoor coils used in heat pumps than in the

condenser coils used in cooling-only units?


✓ To keep the pressure drop across the outdoor coil low




1 | P a g e | G r a d e A + | 2 0 0 2 5

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 Latestupdate. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.79. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

78462 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$13.79
  • (0)
  Add to cart