1. Originally Posted by Jesus"
I think your over simplifying the answer. There are more factors and as previously stated you always have a pressure tempreature relationship.
Oh yeah, I left out the heat.

2. Originally Posted by sktn77a
Boyle says PV=nRT
Actually, Boyle said P is inversely proportional to V given a constant temperature.

Clapeyron should be given credit for the ideal gas law.

Originally Posted by sktn77a
Pressure is proportional to Temperature.
Ahem. In the condenser, pressure and temperature have nearly an exponential relationship due to the fact you're on the refrigerant's saturation curve. Pressure is only approx proportional to temperature in its gas state at a fixed volume.

3. Touchι

4. New Guest
Join Date
May 2009
Location
Atlanta, GA
Posts
3
Post Likes
So you all are saying that the high-side pressure increase in response to ambient temperature increase has really nothing to do with the refrigeration cycle responding to that as an input? That it is simply the gas in the condenser responding to the temperature increase with a pressure increase? And that the pressure increase is immediate and proportional? Nothing fancy is going on here? The system doesn't even have to be running at all and the pressure will increase if this is the case.

BTW, sorry for what may seem like a rudimentary question. I'm actually an electrical engineer trying to gain an understanding of refrigeration by attending Internet University.

Thanks.

5. Originally Posted by nutohvac
So you all are saying that the high-side pressure increase in response to ambient temperature increase has really nothing to do with the refrigeration cycle responding to that as an input? That it is simply the gas in the condenser responding to the temperature increase with a pressure increase? And that the pressure increase is immediate and proportional? Nothing fancy is going on here? The system doesn't even have to be running at all and the pressure will increase if this is the case.

BTW, sorry for what may seem like a rudimentary question. I'm actually an electrical engineer trying to gain an understanding of refrigeration by attending Internet University.

Thanks.
If my explanation didn't help you, see if this explanation from the Principles of Refrigeration (Dossat) is any help:

http://i5.photobucket.com/albums/y17.../Scan10100.jpg

6. Here's another explanation for the result of higher ambients:

http://i5.photobucket.com/albums/y17.../Scan10098.jpg

7. Professional Member
Join Date
Sep 2008
Location
Western PA
Posts
26,674
Post Likes
http://www.chillers.com/PT%20charts%...frigerants.htm

That will give you an idea of the pressure - temperature relationship.

Page 2 of 2 First 12

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•

## Related Forums

The place where Electrical professionals meet.