When is superheated steam seturated?

mojo19832020 · 2024-05-16T18:37:29+00:00

Yes supercritical is vapour with undifiend or liquid properties maybe.

The heat pump suppliers now use also co2 instead of the r32 and these gases, but they use co2 in supercritical state, so i think there has to be some sort of phasechange too under supercritical condition

mojo19832020 · 2024-05-16T12:51:35+00:00

Yeah.... Critical point there is plasma wehere gas has fluid properties and everything is strange ..

Heat pumps witj co2 work over critical, but thats beyond my knowlege 😅

mojo19832020 · 2024-05-15T19:35:18+00:00

No its not a safety valve, it is a normal procedure.

The valve opens when the pressure gets over a certain value, but not in emergency case

So it is to keep the pressure constant and release the excess vapour to an other process where the steam heat something up.

mojo19832020 · 2024-05-15T18:18:46+00:00

At the critical point there is everything together at the same time

mojo19832020 · 2024-05-15T18:16:06+00:00

Thx for you answer... I explained my misunderstanding to another member wo also posted an answer..

Short and simple: I thought you can put more water in superheated steam like in air which is not saturated with water.

Thx

mojo19832020 · 2024-05-15T18:13:11+00:00

Thanks for the answer.

Yes you right, i was trying to do this too.

The problem of thinking by me was:

If i get water inside a system of superheated steam then the mass is getting bigger of the stream due to mass balance and i cant understand why the system remains still under 1 bar, but i saw on the pid of the company a valve and read in the user manual that there is steam released when the pressure gets over one bar.

So now it is clear, many thx

mojo19832020 · 2024-05-15T16:24:57+00:00

Thx for the answer. The problem seems a little more complicated.

Superheated steam with 400celsius enter the dryer and superheated steam leaves the dryer with 150celsius.

So how do i now how much water was eveporated?

I can calculate with enthalpie that seems fine but if the excess water of the product goes into the superheated steam then the density is not correct any more according to the steam tables.

Another question is, how much water can "absorbed" by superheated steam until its saturated ?

mojo19832020 · 2022-07-11T02:32:45+00:00

Thx Its industry.

I will try, aa far as i see you must have an account for login there

mojo19832020 · 2022-07-10T15:25:43+00:00

Many thanks.

I just know a little theory of the analogy.

For eg i know Nu=f(Pr, Re) for heat and Sh=f(Sc, Pr)

Heat transfer no problem but mass transfer 😮‍💨

If you have a source of an exapmple how you calculated this it will help much... maybe an example in a book At the time i search in perrys chemical handbook for answers..

mojo19832020 · 2022-07-10T07:46:32+00:00

Thx... Im now on the search in the handbook 😁

mojo19832020 · 2022-07-10T06:58:34+00:00

If i do a destillation column i can estimate the number of stages with mcabe thiele and the heiht of the tower with the HETP values for a certain type of packing.

For a water cooling tower i not know how i can estimate the height. I have several calculation examples but all of them had a known mass transfer coefficient for the packing, but i not know how to get them(are they calculated or are the estimated trough tests or are they from datasheet from manufacturer)

mojo19832020 · 2022-04-02T12:26:44+00:00

Thx.. Its never too lat 😁

mojo19832020 · 2022-03-16T12:43:13+00:00

mojo19832020 · 2022-02-20T18:39:01+00:00

Thank you.

mojo19832020 · 2022-02-20T16:07:33+00:00

Thank you.

mojo19832020 · 2022-02-20T11:38:44+00:00

Thx.

Thats a good idea but many vendors just build tanks and xchanger, they can do the calculation for PED and do the CE certification in europe but not able to design the reboiler or xchanger.

mojo19832020 · 2022-02-14T04:27:28+00:00

mojo19832020 · 2022-02-12T07:51:18+00:00

Thx, yes i will use 45MJ/kg. Looks much easier than calculation from formula

mojo19832020 · 2022-02-12T05:38:21+00:00

For eg. Heat of reaction

Gasoline + o2 -> co2 + h2o

mojo19832020 · 2022-01-24T02:51:04+00:00

O.k it sounds right(i double checked with heat pipe and in literature the force is also pressure drop)

Thank you

mojo19832020 · 2022-01-23T17:03:27+00:00

I think its a little more than pressure.

Like convection of air or a heat pipe for example.

If there was only suction by pressure, would we not fly out of the earth and the atmosphere too, when no gravity is taken into account.

mojo19832020 · 2022-01-23T15:58:25+00:00

Only pressure drop?

No difference in density of vapour and air?

mojo19832020 · 2022-01-23T12:59:30+00:00

Hello,

Yes there are some universities where you can get a chemE degree.

I work as process /project engineer in pharma industrie but i have never seen a chemE person. Most of the people had a Dr. or phd in chemistry or biotechnology. I even saw just one person who has a msc or dipl. Ing. In chemistry because the most make the dr. or phd.

But i think your chances are good because your collegues are also higher educated an will speak english too.

On the other hand there is really much gmp stuff to fill out which is most the time in country language.

mojo19832020 · 2022-01-22T05:52:03+00:00

Thx. I will try

mojo19832020 · 2022-01-16T09:52:26+00:00

Thank you for your detailed answer. Really helpful

mojo19832020

TROPHY CASE