Which APD helium compressors (HC series) are compatible with older APD cold heads such as the DE-202-B (two-stage)?

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Eugenio Urquiza

This suggests that the HC-2 is compatible with the ADP DE-202: http://www.eas.slu.edu/GGP/fullpapers/sdarticle304.pdf

Rajendra Singh

Dear Euhenio < please see the pressure settng and connection, it should work.

best luck.

Thanks @Rajendra Singh. There's also an electrical cable that apparently controls the phasing between the components and might also power the cold head valves (not sure). So I think determining compatibility is a little more complicated than just the pressure setting and connection -- but that's certainly part of it. I'm hoping we get a comment from someone that has seen this combination in the past. I'm currently leaning towards the HC-2DR, which has a built in electrical cable that looks like it will fit the DE-202-B.

Varadarajan Sridharan

HC-2 compressor and DE-202 forms a pair. This is for sure as I am using it. The letter following DE-202 should be denoting modification at the external portion of second stage to suit a specific application. This may see it from ARS website http://www.arscryo.com/DE-202.html. Electrical cable (between the compressor and cold head) connections would differ in a majour way depending upon if the cold head is operated at 50 or 60 Hz as the cooling capacity is higher in the latter case. Let me know

Thanks Varadarajan! I am curious as to how long these compressors last. Have you seen compressors with more than 30,000 hours? Have you seen any degradation in performance?

Yes, the comressor that I caught hold of had seen typically 28,500 hours. I started using the same. But I cleaned the oil filter before anything. That is all I did. Fortunately, no helium leak (touchwoood!). Using a diffusion vacuum system, I was able hit 13K just in 30 min. After having put the sample holder and heater and carrying out some more modifications, I could reach 13K in 50 min. Still good.

Thanks for the blogpost website. I agree on most of the points mentioned there. You may also get hold of USERs manual from offical web site of the company- coldedge.