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Hi,
It sounds simple enough however when using a TXV selection program there are tipping points that change the valve and orifice size if inputting different liquid temperatures.
So;
I sometimes don't have the info at the time of production therefore for a supermarket rack with a heat exchanger just before the valve I will generally use 70°f (21°C) as my liquid temp for valve selection. Any thoughts?
Thanks, Ken
Ken,
I would have thought you would be indicating amount of liquid line subcooling to make selection. Delta p across valve important & would have thought 2-5 deg C subcooling at inlet of TX valve.
Saturated condensing pressure of 25 deg C seems low, so you would look at possible minimum & maximum ambient temperatures to help selection as well.
Liquid/suction line heat exchanger would not guarantee amount of subcooling though.
Have you any feedback on previous selections?
Ranger 1, I've been selecting TXV's this way for many years without issue. However I'm working with a new installer who believes one of our selections should be larger which led to re-running the numbers research and this inquiry.
Thanks for the feed back I'm sure more will be revealed.
Ken
Sporlan documents 10-9 and 10-10 provide the correction factors to be applied to different liquid temperatures. Their baseline is 100°F.
Download here http://sporlanonline.com/literature-...ansion-valves/
Ken,
No worries, of course a number of ways to cross check things.
After seeing Brians post I found this youtube link.
We probably use Danfoss exclusively & they ask for different things than some others.
https://www.youtube.com/watch?reload=9&v=LIFEQUUru4w
Thank you Brian_UK, I use the Sporlan Product Selection Program. Great tool.
Ken