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Old 04-26-2013, 12:35 PM   #1
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Condenser Air Temperature In


Something I've wondered is how much efficiency difference ( if any ) there is when let's say the condenser is in shade on a summer day with the ambient temperature for example 98F ( 36.6C ) vs the condenser being in a sunny location with the surrounding air temperature 118F ( 47.7C ). If there is a link to this subject where actual studies have been done I'd sure take a look at them and appreciate any information you have.

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Old 04-26-2013, 01:56 PM   #2
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Condenser Air Temperature In


not so much efficiency but energy usage is the issue which translates into $$ cost to run. freon pressure and work/NRG usage is directly proportional to temperature. higher temp=more work for the AC compressor to do to get rid of the heat. if you want to know about efficiency then google SEER and read up on it.

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Old 04-26-2013, 02:18 PM   #3
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Not so much interested in the seer at this point but when you say " higher temp=more work for the AC compressor to do to get rid of the heat " I'm trying to determine how much less / more work is required if the same condenser unit is located in the two different areas with all other elements being the same. ie same building, line set length, insulation level etc.
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Old 04-26-2013, 03:36 PM   #4
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Condenser Air Temperature In


You need to be a mechanical engineer to figure that one out. Or a design engineer.
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Old 04-26-2013, 05:47 PM   #5
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Condenser Air Temperature In


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Originally Posted by Fairview View Post
Not so much interested in the seer at this point but when you say " higher temp=more work for the AC compressor to do to get rid of the heat " I'm trying to determine how much less / more work is required if the same condenser unit is located in the two different areas with all other elements being the same. ie same building, line set length, insulation level etc.

Less work is higher SEER.

It makes no real difference if your condenser is in a grass yard and the sun beating down on it or in a grass yard and in the shade. now if its on a roof, or surrounded by asphalt, it will make a difference. probably use 10% more electric, and lose 5 to 7 % of its capacity.
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Old 04-26-2013, 06:06 PM   #6
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Condenser Air Temperature In


Yep, I have seen the same condensor run 25 psi higher head on R22 with 10 psi more suction just because it is 100F or more on that flat asphalt roof vs on the ground. With it being so hot in Texas and Arizona and the desert I wonder if they get vapor lock in the fuel line to the condensor like a car does??
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Old 04-26-2013, 06:54 PM   #7
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So if the air entering the condenser unit is 98 degrees and the air entering that same unit increases to 118 degrees, for what ever reason the temperature change, the efficiency is the same of the unit. Ok , got it.
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Old 04-26-2013, 07:08 PM   #8
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So if the air entering the condenser unit is 98 degrees and the air entering that same unit increases to 118 degrees, for what ever reason the temperature change, the efficiency is the same of the unit. Ok , got it.

No. 118 air entering the unit makes it less efficient. However 118 in the sun does not make it 118 air entering the unit. The air is still only 98.
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Old 04-26-2013, 07:18 PM   #9
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efficiency is determined by how effective the compressor is/worn out valves or scrolls etc. just like a worn car motor. efficiency goes down with wear. the rest of it stays pretty much fixed as the coils stay the same size.
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Old 05-02-2013, 04:50 PM   #10
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Go to http://www.achrnews.com/articles/how...tem-efficiency

Dirty or blocked has the same effect as heat.

Have a nice day,

Jim Martin




Last edited by beenthere; 05-02-2013 at 07:08 PM. Reason: Removed link to company website in post
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