A Mollier (H-S) diagram would be useful if the vapour compression took place in a flowing system, i.e. with a continuous stream of saturated vapour being compressed in a machine and leaving at 1.6 MPa, since the enthalpy takes account of the PV work done by / on the flowing medium.
In this case...
Since the process is adiabatic there is no transfer of heat from or to the vapour, and since the compression process is also reversible the entropy change is zero, since dS = dq/T in a reversible process and dq, the heat transferred, is zero.
The entropy of the saturated vapour at 110°C is...
If I need physical properties of a common pure gas over just a limited range of P, T conditions I've found the NIST Chemistry WebBook (http://webbook.nist.gov/chemistry/) is often quite handy. Under "Fluid Properties" it lets you generate a table of data that you can copy into Excel. For getting...
This worked alright for me (Excel 2003):
=IF(A1<=TODAY(),SUM(B1:D1),"")
The date is in A1, the numbers to be added are in B1 to D1 and the result is to be displayed in the cell where the above formula is entered, e.g., E1.
Obviously the second day of the month will be in A2, the third in A3...
As Jim says, the correction depends on the operating principle of the gas flow meter.
If the measurement is based on differential pressure (such as with orifice plate, venturi or rotameter type) the correction is approximately:
VTRUE,O = VI,O*SquareRoot(RhoCAL/RhoO)
Where:
VTRUE,O = actual...
Try the DECHEMA Chemistry Data Series (CDS) or the DETHERM online database. The DECHEMA CDS books contains a lot of VLE and other data. Coefficients of the common VLE correlations are given. There is a large overlap between DFETHERM and the CDS. You can do free searches of DETHERM in the...
Thanks to everybody for your comments and suggestions, expecially to dcasto - hydrogen is available on site, so the idea with the catalytic burn may be applicable after all - and to Jason for the idea with the SRU burner manufacturers. I'm following up both avenues.
The same principle would apply in a vertical line:
If your medium is a liquid, locate the pressure transmitter below the lower pressure tapping. This keeps the impulse tubing full of the medium. If the medium is vapour/gaseous, put the transmitter above the higher pressure tapping so any liquid...
The impulse tubing is the piping that connects each side of your differential pressure transmitter to the part of the process over which you're trying to measure the differential pressure, for example on the upstream and downstream sides of a filter or over an orifice plate used for flow...
I realise that the combustion air must also be at 6 bar, but perhaps this wasn't clear from my first post. That seems to be the main difficulty that the burner vendors I've contacted so far have with this application.
The inert gas contains around 3% O2, but I have the catch 22 situation that...
I need to heat an inert gas stream (6 bar, 60 ton/h, mainly nitrogen) from 250°C to 500°C by mixing it with gas from a natural gas burner (duty = 5.5 MW). The burner itself must, of course, operate at 6 bar for this to work. All the burner suppliers I've tried so far have been unable/unwilling...
