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hydrogenhead
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Sizing a Capillary Tube

02/07/2016 4:03 AM

I have been looking at a datasheet on a compressor I have. It is a TLS5K. I want to use it for chilling water but currently it is far too cold and just makes a lump of ice. I am using secop cap sel to help me calculate the tube size but I am not sure what exactly to put in. The compressor has a maximum heat capacity of 225 watts and I will be liquid cooling the condenser to around 20 degrees C. The numbers I have put in are based on the ashrae test conditions but it does not let me set the condensing temp to 20 degrees C. 30 is the lowest it will go. I want to cool the water to 0 degrees C for a compressed air dryer. I will put antifreeze in it.
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SolarEagle
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#1

Re: Sizing a capillary tube

02/07/2016 7:54 AM

Sounds like you need a different refrigerant....

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BevnBeerGuy
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#2

Re: Sizing a Capillary Tube

02/07/2016 9:52 PM

Hi HH,

Try the following inputs:

Duty: 450 Watts (That is the performance of your compressor at the specifications listed below)

Evaporator: -5C

Condenser: 35C

Superheat: 4K

Subcooling: 10K

How much water are you trying to cool? What are you using to control the temperature of the water bath?

The refrigerant is R290 which is highly flammable propane. Use relevant precautions or refer to ISO 5149 or IEC 60335-2-24 if you need assistance.

Good Luck!

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hydrogenhead
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#6
In reply to #2

Re: Sizing a Capillary Tube

02/08/2016 3:23 PM

I am not using anything to control the temperature. I have the system built and working but it is too cold. I am cooling 2 liters of water.
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BevnBeerGuy
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#8
In reply to #6

Re: Sizing a Capillary Tube

02/08/2016 4:17 PM

Not sure of the particulars of your set up, heat loads and configuration, but a solution may be to up your water/cooling reservoir to say 20 litres and use a digital thermostat to cycle your compressor.

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hydrogenhead
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#9
In reply to #8

Re: Sizing a Capillary Tube

02/08/2016 4:37 PM

I will look into it. I think my capillary tube needs shortened as it is 2.5 metres of 0.8mm I have currently. I will be hopefully getting a few more big black blobs out of some more fridges with more power but I will experiment more.
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PWSlack
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#3

Re: Sizing a Capillary Tube

02/08/2016 5:28 AM

Do let the forum know how the telephone call with the equipment supplier went.

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hydrogenhead
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#7
In reply to #3

Re: Sizing a Capillary Tube

02/08/2016 3:25 PM

What telephone call? The propane came from a Calor seller and the compressors were in fridges at the side of the road.
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PWSlack
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#11
In reply to #7

Re: Sizing a Capillary Tube

02/09/2016 3:38 PM

So where did the data sheet come from? Wal-mart?

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hydrogenhead
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#12
In reply to #11

Re: Sizing a Capillary Tube

02/09/2016 4:14 PM

No, Google.
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HiTekRedNek
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#4

Re: Sizing a Capillary Tube

02/08/2016 6:46 AM

Why not use an adjustable thermostatic expansion valve(TXV)?

Then adjust according to load.

This will work well on a fixed heat load.

If load is variable,use an automatic TXV.

Info at link:

http://www.parker.com/literature/RAC%20Division%20-%20Europe/RAC%20Division%20-%20Europe%20-%20Literature%20Documents/Service%20and%20User%20Manuals/10-11TEV-2UKLow.pdf

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horace40
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#5

Re: Sizing a Capillary Tube

02/08/2016 9:53 AM

A capillary tube is unlikely to provide adequate speed control of load for a compressed air drying application if sensing the temperature of the compressed air heat-exchanger.

If set at 0C (much too low) the chiller freezes up and stops the air, or if set too high, doesn't condense the water vapour.

Unless you are talking of a heat-sink chiller type.

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Tornado
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#10

Re: Sizing a Capillary Tube

02/09/2016 3:01 AM

If you are freezing the water, a longer rather than shorter cap tube might help. Even better would be a suction pressure regulator, but I don't know what is available for really small systems such as this. Sporlan probably has something.

(I'm a retired industrial ammonia guy, having worked on systems with 45,000; 70,000, and 240,000 pounds of ammonia. Coors in Colorado, Anheuser-Busch in Missouri, and Tropicana in Florida have even bigger systems, which I have not worked on.)

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BevnBeerGuy (2); HiTekRedNek (1); horace40 (1); hydrogenhead (4); PWSlack (2); SolarEagle (1); Tornado (1)

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