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25-08-2017, 10:21 PM #1
UK - Danfoss Refrigerant Slider app
Sorry for the rookie question, but i recently got the danfoss refrigerant slider app to help with day to day pressure checks ect.
I have asked a few other engineers that i work with and no one can seem to give me a direct answer and it seems they dont really understand it either.
Basically when you choose the gas type you can select either bubble or dew, what am i supposed to be using to work out the correct running pressures?
Any help would be much appreciated
Rik
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25-08-2017, 10:28 PM #2
Re: UK - Danfoss Refrigerant Slider app
Knowledge of what you are measuring.
Knowing the difference between bubble or dew points is fundamental to working with refrigerants.Brian, retired in Devon.
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25-08-2017, 10:33 PM #3
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25-08-2017, 10:42 PM #4
Re: UK - Danfoss Refrigerant Slider app
As Brian says you need to know what you are measuring.
Basically when using the dew point info you measure the evaporator superheat , when measuring the condenser liquid subcooling you use the bubble info.
The reason is with the new type gases such as R407c etc which are made from 3 different refrigerants ,the pressure / temperature relationship is not constant as like the good old R12, R22 etc. This is called the temperature "glide" which some of these gases have a glide of 6k so you have to know if its the dew point or the bubble point you need to use.
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25-08-2017, 10:45 PM #5
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15-12-2017, 01:44 PM #6
Re: UK - Danfoss Refrigerant Slider app
Think: "dewperheat" dewpoint for superheat, and "Bubcooling" bubblepoint for subcooling
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15-12-2017, 01:54 PM #7
Re: UK - Danfoss Refrigerant Slider app
Rep point added my friend.
I like your way of remembering the difference.
Tricky.
Asking when not sure shows initiative,
Those you asked not knowing!
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16-12-2017, 08:22 PM #8
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Re: UK - Danfoss Refrigerant Slider app
Not to forget that when you calculating heat exchanger TD-s you should use midle between buble and dew point.