The driving force will be pressure, a greater rate of transfer until all the liquid leaves the cylinder in the 100f room. Equlaibrium will occur (the pressure in the 80f room), as some point when the...
Type: Posts; User: barbar
The driving force will be pressure, a greater rate of transfer until all the liquid leaves the cylinder in the 100f room. Equlaibrium will occur (the pressure in the 80f room), as some point when the...
It is the natural instability of system than gives the potential for liquid sub cooling.
A simple example that we see every day
" we have a cond fan, controlled by a simple pressure switch, the...
Only RE and this site, and had some very interesting conversations. And there a lot of very clever people on both sites.
As an industry there is always plenty to learn, even though it sometime...
barbar aka mad fridgie
This is always an interesting subject.
My first observation is that liquid temperature measured by the service tech is normally incorrectly (influence of ambient temp),...
I was thinking, could Phosgene be the issue, as an old fridgy I did what I had to do to get the plant up and running quickly, I can not count how many lungs full of burning refrigerant I have taken...
That is so true.
Thank you.
I think our wives are some what stronger than us,
As the population grows, more changes are coming good and bad.
Over the past 2 years I have been very badly affected by issues of mental health of at least one of my siblings. (which could happen to anybody at any time)
However, it seems to be a pattern a high...
Maximum total load is = max. cutting machine drive motor output "Kw" plus pump output "Kw"
R410a comp using R22 refrigerant.
To achieve the same duty the displacement or hourly swept volume (if running at a different speed) must be the same as the original to achieve the same mass flow...
That is about 1500% to big
So many pages to read.
The vacuum pump is there for one purpose only, to remove non condensables, which is split into 2, in the chamber and within the product itself. So the vacuum pump should turn...
That is the easy bit.
The load is very small, with many refrigeration issues (even on big ones), greater than you think.
Here is an easy way, for your load, have a closed vessel (long and skinny)...
20hrs seems OK
keeping it simple what is your duty
j/s = w
And welcome to freeze drying!
How long would you like it to take.
Will this time allow energy to infiltrate the product (for sublimation) without the product (parts of) raising above the eutectic...
You have gone so far.
(latent) Energy of sublimation
Needs to be even colder.
work your load out first. Total Kgs H2O to be transfered and time, not a linear process. Keep the product as thin as possible. The inner moisture has to pass through the...
So if your running at 50pa, with ice formation on evap, your refrigeration temp is going to b lower than -35C.
First flush should not be an issue. (free moisture)
How thick is the product?
Wrong!
The deeper the vacuum the colder the temperature!
What is the eutectic point of your product?
There is a lot more to it than you think, especially freeze driers.
Why not just go multistage peltier, more up your alley
Yes sort of correct, he did bring in the issue of an energy balance. basically how can you work on airflow rates, if you do not know the true load.
WOW, stop right there!
The problem, you are starting in the middle.
Understand your application! so what is the room used for? Yes you have people doing work, do you want to suffocate them? So you...
With that pic, you should be in real estate.
Why not put an elbow down on each compressor, fitter suction drier, then a "U" bend back into an elbow back into the "tee"
I must be showing my age!
Belts the same size, "generic numbering system" is not the same as a matched set. If they are not matched getting equal tension on both is near on impossible.
I have seen this type of issue...
Just a simple question,
Are you replacing with matched belt sets. Not the size, but the production number on the side?
I better explain.
On screw and scroll, you have an interstage port, commonly known as an "economizer", in simple words, lets say half way through compression, there is a void that could be filled...
This one maybe a little harder to explain, over the internet, especially as I am a very slow typer!
The discharge temperature, (theory) is a fuction of compression ration (pressure difference) and...
Discharge pressure would drop, correct.
But so would your suction increasing suction superheat (reducing refrigerant mass flow), increasing discharge temperature.
Gauges without saying, our industry relies on pressures and temps.
However my guess would be high suction superheat, short of refrigerant!
Discharge temp has no direct relationship to saturated condensing temperature "SCT".
R410a goes critical at SCT just above 70C (158f) (677psig)
As far as I can see, it was temperature measurements, not pressure.
My very first question is
"are you measuring compressor discharge pressure or liquid pressure"? If discharge are you then making a presumption about liquid pressure and thus the sub-cooling?
[QUOTE=barbar;24474391]You need 2 things for de-humidification,
1 low evap temperatures (so either a smaller indoor unit, or reduced airflow passing through your present evaporator)
2 Time, which...
You need 2 things for humidification,
1 low evap temperatures (so either a smaller indoor unit, or reduced airflow passing through your present evaporator)
2 Time, which normally means, you need...
EPR's are generally not fitted on cases as a pure temperature control (even though well set one can), they are fitted to keep the temperature difference on the evap low, to stop de-humidification...
You are fundamentally correct about the EPR, however experience says that the EPR seat gets drawn(scratched) over a period, so after time the suction can lower. At 15f you will still get ice build up...
We can see that it is split fin "air entering the bottom" and therefore can assume that the refrigerant enters the top to ensure counter cross flow.
So there is a number of possible causes.
1 Very...
I understand.
Before you cut your pipe, place your flaring block over the dis-formed pipe and tighten (not 100% force). This will bring it back to shape.
Only use a flaring tool, that rolls the...
Come to NZ and get one of our snakes, they can do everything you can think of.
Excellent on hard drawn, especially on the large thick wall pipe used for R410a and CO2. Internal Burr is very small, no external burr, no distortion of the pipe. Very quick compared to a more...
The main purpose is my sisters wedding, and quality time with family. (my kids are joining us in Europe)
An old English saying,
"there's nothing as funny as folk"
So I do hope I meet a variety of people, part of being a traveler. I have been to many gay bars, always good dance music and I have seen...
I have "her who must be obeyed" with me, so have all the protection I need. She will certainly enjoy Chocolate heaven.
Public transport is quite an adventure in its self, as something we really do...
NIB is the name of the company. ( I think is an Aussie based company)
All does depend upon which type of visa she is on. But generally speaking again she should be able to get an extension of 11months, which costs only a few hundred dollars, however she must show that...
If she can get a work visa for a period greater than 2 years, then she will be covered as if she was a resident. (but she may be on a young persons working visa, which is intended to allow young...
I try to sit in the front seat, that way i can see where i am going and have a chat with the driver. In NZ it is law, but I am master criminal and do not wear them.
Thanks for the info.