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-   -   Pressure temperature chart for refrigerants (http://www.diychatroom.com/f17/pressure-temperature-chart-refrigerants-101915/)

 Samart 04-17-2011 07:46 PM

Pressure temperature chart for refrigerants

Hi guys,

I have couple of questions.
1)The pressure values listed on this chart are suction pressure or discharge pressure?
2)Is the temperature listed is ambient temperature.

Sam

 yuri 04-17-2011 07:50 PM

 Samart 04-17-2011 07:58 PM

Quote:
 Originally Posted by yuri What chart? Click on Go Advanced and follow instructions to upload a jpeg etc.
I got the chart but what to understand the following:
1)The pressure values listed on this chart are suction pressure or discharge pressure?
2)Is the temperature listed is ambient temperature.

Sam

 JJboy 04-17-2011 08:21 PM

The temperature is related to the pressure. When the temperature changes the pressure increase or decrease.

 Samart 04-17-2011 08:24 PM

Quote:
 Originally Posted by JJboy The temperature is related to the pressure. When the temperature changes the pressure increase or decrease.
Thanks for the reply. I understand that, but not sure if the pressure values listed on the pressure temperature chart are suction pressure values or discharge pressure.

 Marty S. 04-17-2011 08:49 PM

So long as there's a saturated mix of both liquid and gas present it covers everything. Look at your chart and tell me what the R22 temp shows with a suction pressure of 60. Now look at the chart and tell me what it is on a 180 psig liquid line. How about a R22 tank with vapor and liquid in it at a room temp of 70 degrees?

 Samart 04-17-2011 09:05 PM

Quote:
 Originally Posted by Marty S. So long as there's a saturated mix of both liquid and gas present it covers everything. Look at your chart and tell me what the R22 temp shows with a suction pressure of 60. Now look at the chart and tell me what it is on a 180 psig liquid line. How about a R22 tank with vapor and liquid in it at a room temp of 70 degrees?
R22 shows 34 F at 60psi and 93F at 180psi. At 70F the pressur is showing around 120psi.
Thanks

 Samart 04-17-2011 09:30 PM

Quote:
 Originally Posted by Marty S. So long as there's a saturated mix of both liquid and gas present it covers everything. Look at your chart and tell me what the R22 temp shows with a suction pressure of 60. Now look at the chart and tell me what it is on a 180 psig liquid line. How about a R22 tank with vapor and liquid in it at a room temp of 70 degrees?
I will wait for your response.
Thanks a lot

 JJboy 04-17-2011 09:56 PM

1)The pressure values listed on this chart are suction pressure or discharge pressure?

Compressor does the change low pressure to high pressure. So the temp changes low to high temp..... What is your question?

 Marty S. 04-17-2011 09:56 PM

That's all there is to it,a relationship between pressure and temp for a given refrigerant. You have a system running 60/180. The suction line measures 50 degrees so how much is the refrigerant super heated ? The liquid line measures 80 which means you have what for subcool?

 Samart 04-17-2011 10:04 PM

Quote:
 Originally Posted by JJboy 1)The pressure values listed on this chart are suction pressure or discharge pressure? Compressor does the change low pressure to high pressure. So the temp changes low to high temp..... What is your question?
I mean when to compare the pressure values on the PT chart with the actual suction pressure reading on the ac and when to compare with the actual discharge pressure reading

 Samart 04-17-2011 10:14 PM

Quote:
 Originally Posted by Marty S. That's all there is to it,a relationship between pressure and temp for a given refrigerant. You have a system running 60/180. The suction line measures 50 degrees so how much is the refrigerant super heated ? The liquid line measures 80 which means you have what for subcool?
I mean when to compare the pressure values on the PT chart with the actual suction pressure reading on the air conditioner and when to compare with the actual discharge pressure reading

 JJboy 04-17-2011 10:25 PM

The difference between the temps that you are ​​measuring with a thermometer and the values ​​of PT chart are due to the SH and SC

 Samart 04-17-2011 10:59 PM

Quote:
 Originally Posted by JJboy The difference between the temps that you are ​​measuring with a thermometer and the values ​​of PT chart are due to the SH and SC
Does the temperatures on the PT chart indicate the ambient temperature or the pipe temperature?

 JJboy 04-17-2011 11:06 PM

PT chart indicate the temp of the environment where is the refrigerant. The pipe temperature it's the measured temp

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