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
CNST 2321 || with 100% Error-free Answers. $11.39
Add to cart
Quickly navigate to
Preview
  2.  
  3. CNST 2321
  4.  
  5. CNST 2321

Exam (elaborations)

CNST 2321 || with 100% Error-free Answers.
 0 purchase
  • Course
  • CNST 2321
  • Institution
  • CNST 2321

What are the methods of control for air systems correct answers 1. Varying the temperature of the air supplied while holding the flow constant 2. Varying the flow of warm or cold air supplied while holding the temperature constant ng both the temperature and the flow of air supplied or turning th...

[Show more]

Preview 2 out of 9  pages

Document information

  • August 4, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • what are the methods of control for air systems

Written for

  • CNST 2321
  • CNST 2321

Seller

avatar-seller
FullyFocus

Reviews received

Content preview

CNST 2321 || with 100% Error-free Answers.
What are the methods of control for air systems correct answers 1. Varying the temperature of
the air supplied while holding the flow constant
2. Varying the flow of warm or cold air supplied while holding the temperature constant
3.varying both the temperature and the flow of air supplied or turning the system on or off

Multi Zone VAV systems are correct answers 1 used extensively in commercial buildings
2 have pot
3 least f

The actuated assembly is _____ _____ if flow is prevented when the control pressure (or other
signal) is absent correct answers Normally closed

All HVAC systems require some form of control to accomplish their task of controlling one or
more of the following properties correct answers 1. Temperature
2. Pressure
3. Flow rate
4. Humidity
5. Speed (fixed or variable)
6. Time

In HVAC terminology, a zone is an area where temperature is controlled by a single thermostat
correct answers True

The tendency of an assembly to conduct heat (U-factor) or heat transfer is directly proportional
to R and inversely proportional to U correct answers False

What are the three conditions that affect heating and air conditioning loads from introduction of
outside air? correct answers 1. Infiltration
2. Ventilation
3. Conduction

Energy codes recommend a maximum winter indoor design temperature of ____ and a minimum
summer indoor design temperature of ____. correct answers 72°F / 75°F

Comfort for building occupants is affected by a number of environmental variables, including the
following: correct answers 1. Temperature
2. Airflow
3. Humidity
4. Radiation

Dew point is when the humidity level reaches 75% at a given temperature correct answers False
(100%)

, Absolute humidity correct answers The amount of water in the air (measured in grains or pounds
of water per pound of dry air):

Two basic properties of air-water mixtures are: correct answers Temperature and humidity

Heating and cooling the ventilation (outside) air requires considerable energy, which is wasted
unless the energy is recovered from the exhaust air correct answers True

According ASHRAE, boilers and furnaces which condense flue gas in second heat exchangers
generally have annual fuel utilization efficiency (AFUE) in what range? correct answers 92% to
98.5%

List the four components of the vapor compression cycle in order correct answers 1) compressor
2) condenser
3) expansion valve
4) evaporator

If refrigerant is used in the air conditioning coil (evaporator), refrigerant to air exchange, the
system is generally termed direct expansion (DX) correct answers True

Refrigerants transfer heat (cooling) by changing phase from solid to vapor correct answers False
(Liquid to vapor)

What are the three circuits in a chilled water system? correct answers 1) refrigerant
2) chilled water circuit
3) condenser circuit

Which heat recovery system (ERU) will result in the highest cooling savings? correct answers
Enthalpy wheel

Which of the following statements are true regarding DX systems? correct answers 1) they
include roof top units and PTAC units
2) they can have condensers remote from the fan coil unit
3) refrigerant is used in the air conditioning coil (evaporator)

What are normal materials of construction for coils? correct answers Copper tubes and aluminum
fins

Which is the normal flow in a heating coil? correct answers Counter flow, which is water in on
the leaving air side

What is the unit of measure for water pressure in a pipe? correct answers Psi

What is the unit of measure for water velocity in a pipe? correct answers 1. Gpm
2. Ft/sec

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 FullyFocus. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $11.39. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

69252 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$11.39
  • (0)
Add to cart
Added