Exam (elaborations)
COSC 325 EXAM 1 NEWEST ACTUAL EXAM QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE STUDYGUIDE
- Course
- Institution
COSC 325 EXAM 1 NEWEST ACTUAL EXAM QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE STUDYGUIDE
[Show more]
Content preview
COSC 325 EXAM 1 NEWEST ACTUALEXAM QUESTIONS AND DETAILED
CORRECT ANSWERS | A+ GRADE
STUDYGUIDE 2024-2025
What does having a COP of 1 mean? Correct Answer
They can deliver 3400 BTU from each kilowatt of electrical
energy input.
out of a heat pump and a electric heat resistance heater
which one deliver more heat in mild winter climates?
Correct Answer heat pumps
in a mild winter climate, where does a heat pump get most
of its BTU? Correct Answer From the winter environment.
heat pump performance improves with _______
environmental temperature Correct Answer increasing
heat pump performance decreases with ____
environmental temperature. Correct Answer decreasing
A heat pump produces less heat during cold weather, how
is this over come? Correct Answer Supplemental electric
resistance heat is installed to augment heat pump output.
What is HSPF? when is it used? Correct Answer Heating
Seasonal Performance factor is a heating efficiency index
,used instead of COP for residential heat pumps. Like
SEER it is measured in BTU per watt.
what does a air-source heat pump use as it heat source or
heat sink? Correct Answer outdoor air
What needs to be watched for and taken care of for an air-
source heat pump during cold, damp weather? Correct
Answer Ice can form on the heat pump's outdoor coil, and
a defrost cycle is required.
For a water-source heat pump, what does it use as a heat
source or heat sink? Correct Answer It uses water instead
of air.
What is more efficient, a water-source heat pump, or an
air-source heat pump? why? Correct Answer A water-
source pump is more efficient because water from a lake
or well is usually warmer than winter air and cooler than
summer air.
When water is not available for water-source heat pump,
what can be used as an alternative? Correct Answer The
earth may be used as a heat source and sink. A heat
pump can be connected to a buried loop of piping that
circulates water to give or take heat from the earth.
In super markets, how is refrigeration energy used twice?
Correct Answer First it cools food, and then it heats the
store.
,What is a chiller? Correct Answer it includes all parts of
rerigeration cycle, evaporator, condenser, compressor,
and expansion.
how is using water instead of air more beneficial than
using water to carry heat? Correct Answer water used to
carry heat saves energy and space when transport
distance exceed 200 ft.
what is a cooling tower? Correct Answer this dumps
building heat to the environment by evaporating water.
cooling towers can be more efficient than air-cooled
condensers, and they require less space.
What are the 3 type of piping arrangements that are
utilized for heating-cooling applications. Correct Answer
two-pipe, three-pipe, and four-pipe
describe a two-pipe arrangement Correct Answer The
heat changer in each air handler or fan coil receives hot or
chill water depending on the season. Two-pipe systems
are economical, but changeover to and from heating or
cooling is slow. The heat exchangers inside air handlers
and fan coils are called "decks" or "coils"
In winter months, large office buildings heat the _____
zones and simultaneously cool the ____ zone to remove
heat from people and lights. Correct Answer exterior and
core
, what is a pro and con of four-pipe arrangments? Correct
Answer this arrangement increases piping costs, but they
allow coincident heating and cooling and easy and rapid
change to and from heating or cooling.
what are the pros and cons or a three pipe system?
Correct Answer this arrangement saves some dollars by
using a common return. comfort control is as good as a
four-pipe system, but when some air handlers are heating
and others are cooling, operating costs increase because
the return water temperature is high for the chiller and low
for the boiler.
Design air velocity at the face of the hot deck is usually
about ____ FPM (frame per minute) and room air supply
temperature varies form ___ degrees to ___ degrees
Correct Answer 700, 80 degrees to 130 degrees
Design air velocity at the face of the cold deck is held near
_____ FPM to encourage condensation. Room air supply
temperature can be as low as ___ degrees F Correct
Answer 500 FPM 55 degrees F
usual water supply temperature is ____ degrees F but
very large heating systems circulate pressurized water at
___ degrees F Correct Answer 180 dgrees, and 300
degrees
calculated heat (gain or loss?) sets total boiler capacity
Correct Answer loss
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 TUTORWAC. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $22.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now