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Thread: Low Evaporating Temp TXV
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27-09-2011, 07:22 PM #1
Low Evaporating Temp TXV
How to set TXV temperature in Brazed Plate Heat Exchanger. I am assembling a chiler for water temperature of 34 degree F. The temperature range printed on TXV is from -49 to +50 F
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28-09-2011, 11:13 AM #2
Re: Low Evaporating Temp TXV
What kind / brand is your TXV?
To make progress is never good enough, I want to do better and better and better
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28-09-2011, 01:45 PM #3
Re: Low Evaporating Temp TXV
It is Danfoss TEX2 for R22
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28-09-2011, 02:16 PM #4
Re: Low Evaporating Temp TXV
What's the evaporating temperature and superheating that is concern to the selection of the plate heat exchanger?
To make progress is never good enough, I want to do better and better and better
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28-09-2011, 04:06 PM #5
Re: Low Evaporating Temp TXV
The target Evaporating temperature is 35 F or 2 C. Not sure about superheat
What kind of design chanes required for different evaporating temperatur like very low temperature freezers for ice cream hardning
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29-09-2011, 10:45 AM #6
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30-09-2011, 09:06 PM #7
Re: Low Evaporating Temp TXV
Sorry for late reply The detail of the chiller is as following
It is a water chiller for a Bakery
Ref Capacity 10 ton
Tank Capacity 90 gal
Water Circulation 30 gal / min
Delta Temp 10 C
Required wter temp 2 C
Water Draw from tank 30 gal after every 20 miniuts
I think I have made a mista to ask you the design Evap temp of 2 C or 34 F. I think it should be some where minus 5 C (to achive 2 C water)
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30-09-2011, 09:22 PM #8
Re: Low Evaporating Temp TXV
What is the PHE capacity?
The TXV size has to fit that capacity regardless the evaporting temp. When you get this info, you can determine the condensing unit size, Or you can check your 10 ton refrigeration unit capacity at -5C and then work out the TXV size and PHE capacity at your required water flow and leaving temp.
Remember that water freezez at 0C so you might need to add some glycol but that will decrease the unit capacity.
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01-10-2011, 12:04 AM #9
Re: Low Evaporating Temp TXV
That's right chemi-cool. But you have to keep in mind that the "size" of the TXV is also affected by the evaporating temperature. Lowering the evaporating temperature less capacity it allows considering the same superheat.
To make progress is never good enough, I want to do better and better and better
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02-10-2011, 02:51 AM #10
Re: Low Evaporating Temp TXV
My basic question is still there
How to lower the evap temp setting of TXV
The way I understand the factory setting is @ 7 C
How to make it -5 C
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02-10-2011, 09:38 AM #11
Re: Low Evaporating Temp TXV
watch out for the low temps in your plate evap. remember the 4°C fase change of water!!
if yore flow is not strong enough.....sh...t will happen
Ice
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02-10-2011, 10:58 PM #12
Re: Low Evaporating Temp TXV
To make progress is never good enough, I want to do better and better and better