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Old 03-02-2011, 07:21 PM   #1
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I have 2 technical question


1- Delta temp - How to interpret the outcome temp of the relationship between Supply and Return temp?

2- Compression Ratio - How to interpret the compression ratio for troubleshooting a system?

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Old 03-02-2011, 08:21 PM   #2
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I have 2 technical question


delta temp if you had 72 degree return temp and a 53 degree supply temp you would have a 19 degree temp difference rule of thumb is 16 to 20 degree diff and system is working with in range the same for a furnace if you had 75 return and 125 supply air temp you have 50 degree temp rise the unit size and manufacture will set the range (i.e 35-70 ) but most tech use super heat and subcooling now its a must with t.x.v valves on most systems and as far as trouble shooting you should be abel to down load some empathy charts online the charts and the data from the system your working on should be all you need

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Old 03-02-2011, 09:08 PM   #3
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I have 2 technical question


Check out this expanded performance data on a Goodman JJ. For cooling the bottom line is the higher the moisture in the indoor air, the lower the delta T
http://www.cozyworld.ca/goodman-heat...-tech-info.PDF
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Old 03-03-2011, 05:30 PM   #4
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I have 2 technical question


Ideally, the delta t should be taken at the unit, ie. supply plenum and return plenum.

If the supply air at the vent is > 2-4 degrees warmer than at the supply plenum, your picking up to much heat in the ducts.
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Old 03-03-2011, 06:18 PM   #5
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I have 2 technical question


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Originally Posted by Poppyloppy View Post
Ideally, the delta t should be taken at the unit, ie. supply plenum and return plenum.

If the supply air at the vent is > 2-4 degrees warmer than at the supply plenum, your picking up to much heat in the ducts.

Thanks Poppyloppy.

Does anyone have Compressor Performance Calculator program?

http://hvac-talk.com/vbb/showthread.php?t=56471
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