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Thread: High superheat TXV
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19-09-2009, 11:34 PM #1
High superheat TXV
A conventional adjustable TXV, for example Alco brand, will allow a maximum superheat setting of around 10.8-11.35K, at evaporator discharge.
I am searching for an adjustable TXV which will allow stable control at superheats higher than this, perhaps as high as up to 14-15K.
The intention is not to use a suction-line heater for this application.
If there are alternative control-valve/sensors that will allow these high superheats to be reached, then I'd be interested as well.
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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20-09-2009, 12:02 AM #2
Re: High superheat TXV
Hi DesA
have looked at using an Air conditioning rated TX valve, that operate at a higher superheat range. Sporlan do a CP100 txv cap.
magoo
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20-09-2009, 12:15 AM #3
Re: High superheat TXV
Thanks so much Magoo. I'll follow up on the Sporlan CP100 TXV - much obliged.
(I've tried adding to your reputation, but it tells me to keep spreading it around firstEngineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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20-09-2009, 02:25 PM #4
Re: High superheat TXV
Perhaps an electronic EEV like the E2V of Carel, not that expensive.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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20-09-2009, 03:27 PM #5
Re: High superheat TXV
Thanks very much Peter_1 - that's a good lead. Many thanks.
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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20-09-2009, 04:13 PM #6
Re: High superheat TXV
Danfoss ETS and controller we have controlled superheat at 25'c
The Bridge Keeper
'Answer me these questions three, n'er the other side ye see.'
What is your name?
What is your favourite colour?
What is your suction superheat?
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20-09-2009, 04:36 PM #7
Re: High superheat TXV
You're right about the Danfoss but compare once the price for both?
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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20-09-2009, 04:57 PM #8
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22-09-2009, 02:59 PM #9
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22-09-2009, 04:26 PM #10
Re: High superheat TXV
Are there any other non-electronic TXV's with extended super-heat capability?
Are for instance, stronger springs a possibility, for instance, for the Alco, Danfoss, Sporlan series TXV's?
Would alternative bulbs be of use? The refrigerant in use is R-134a.Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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22-09-2009, 05:16 PM #11
Re: High superheat TXV
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22-09-2009, 05:29 PM #12
Re: High superheat TXV
You might consider switching to an AEV, set the Te,sat where you want it, then control superheat with fan speed. The higher the fan speed/heat load, the higher the superheat.
Last edited by Gary; 22-09-2009 at 05:32 PM.
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23-09-2009, 02:22 AM #13
Re: High superheat TXV
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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23-09-2009, 02:27 AM #14
Re: High superheat TXV
Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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23-09-2009, 02:30 AM #15
Re: High superheat TXV
A TXV with MOP - revisited:
Can we review exactly how this works?
Acts as a normal TXV until a certain limiting pressure (determined by MOP setting) has been reached, then TXV begins shutting back mass-flow & allows the superheat to drift upwards, in the process.Engineering Specialist - Cuprobraze, Nocolok, CD Technology
Rarefied Technologies ( SE Asia )
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23-09-2009, 03:14 AM #16
Re: High superheat TXV
Last edited by Gary; 23-09-2009 at 04:01 AM.
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23-09-2009, 04:19 AM #17
Re: High superheat TXV
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