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Low Ambient Conditions
Eugene Silberstein 3
Member Posts: 1,380
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Refrigeration and Year-Round Air Conditioning
Although the heating season is upon us, there are many applications where the "chill heads" are still out and about, performing air conditioning and refrigeration service work on equipment that must operate properly year round. Of course, I am referring to heat pump systems, supermarket refrigeration, ice skating rink refrigeration, floral refrigeration and restaurant refrigeration, to name a few.
There has been much discussion on the system-charging practices that are used during periods of low ambient temperatures.
What methods have you guys been using and to what degree of success do you attribute to them, i.e. low call back rate, etc. ?
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Charging
There are charts that take into consideration total additional length of liquid line and you can add or subtract accordingly. I have in the past blocked off cond fans and coils to try and simulate a 60 to 70* day, but when wind conditions are strong it screws it up.0 -
Bless you!!:)
I have always wondered if there were reliable charging methods other than weighing it in. It always seems that when a charge is adjusted in low abient conditions, it messes with the units ability to cool efficiently in normal or warm weather. What a good question.0 -
That is a
> I have always wondered if there were reliable
> charging methods other than weighing it in. It
> always seems that when a charge is adjusted in
> low abient conditions, it messes with the units
> ability to cool efficiently in normal or warm
> weather. What a good question.
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As soon...
As soon as we get some more feedback from some of the other guys, I'll provide some reliable low ambient charging methods.0 -
I just
try and get my evaporator temps 15 degree below ambient.
Also have try adding 126 degree above ambient at compressor
discharge...R22 only.
However no matter what I try I still tell the customer will see you come summer to adjust charge.
I too look forward to hearing from others.
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How about...
How about using an evaportor saturation temperature that is 35 degrees lower than the return air temperature? This will get you even closer.0 -
Thanks Professor
Can that be used when charging heatpumps in heat mode?0 -
The 35
The 35 degree delta-t was intended for cooling applications where the return air temperature is the room temperature. For example, if the room temperature is 75 degrees, the evaporator saturation temperature will be about 40 degrees, or 35 degrees lower than the return air temperature.
More on heat pump charging to follow.0 -
Ok
This is like pulling teeth...LOL.
How about discharge superheat when charging heatpump or refrig equipment in low ambient temps.
Would that be more precise and if not, why?0 -
Mom always told me
that I should become a dentist. I think you just confirmed that, Don!
Check this out... I think it will help you out for charging heat pump systems in the heating mode.0 -
LOL
Moms know best.Thanks Professor I hope all is well with Mom by the way.
So how the book going? Will it be availible any time soon?
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If you are referring to....
If you are referring to my new book on pressure enthalpy, the answer is, "going very well and available soon". This is the first book that I am producing myself and I am very pround with its progress so far. I am hoping to have it completed by mid january.
My goal with this book was to bring pressure-enthalpy, which was primarily used for system design, into the hands of service technicians. P-h is a valuable troubleshooting tool when used correctly.
I will keep you all posted about the book's progress.
As far as mom goes, she seems to be doing well considering the fact that she has very little kidney function. As you might remember, the doctors gave her three days to live on October 16th and, well, here we are on December 11th and she is still going... just like the Energizer bunny.
Hope all is well with you, Don and thanks for asking about mom and the book.
P.S. I know I asked you this before, but where in this fine land are you located?0 -
Yes Please
someone step up to plate will ya!
Professor, I'm in the tidewater area of Virginia.And please
put us on the list when the book become availible.
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This discussion has been closed.
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