Class notes
Physics: Heat Pumps
- Course
- Institution
These notes are my own taken in class. It is about how heat pumps work and has diagrams explaining it.
[Show more]
Seller
Follow
aliyahikhlas
Content preview
Heat PumpsUnder normal circumstances, heat only flows from
high temperatures to low temperatures.
In order to move heat from a low temperature
environment to a high temperature environment,
work needs to be done (or energy needs to be
transferred).
This is what a heat pump does. This is why fridges
keep our food cold. They move heat from the cold
inside of the fridge to the warmer outside. This is
why the grill at the back is warm, it is the heat that
has been removed from the inside.
A simple heat pump such as a fridge has four
basic components:
1. condenser,
2. expansion valve,
3. evaporator,
4. compressor.
A→B: The electrically driven
compressor increases the temperature and
pressure of the gas and forces it into the
condenser coils [the back of the fridge].
B→C: Because the temperature of the gas
is higher than the temperature in the
room, heat transfer [QH] from the gas to the
room occurs as the gas condenses to a liquid.
C→D: The liquid then flows back through
a pressure-reducing valve to the
evaporator coils [pipes IN the fridge] cooling
rapidly.
D→A: As the liquid is now cooler than
the inside of the fridge it absorbs heat from
it.
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 aliyahikhlas. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.73. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
50064 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now