Performance issue

[supers_5]

No, it is not having

Then I wouldn't go below 8°f SH. The higher you can keep it, the safer the compressors.

[supers_5]

BTW, is the software actively calculating the output capacity?

Have you selected the correct liquid in the software? What liquid are you using? Straight water? Any glycol? Anything else? Are the flow readings also from the software?

Is this unit actually keeping up and you're just confused about the output capacity difference, or are you needed a bit more capacity?

[ddkk0099]

Yes, agree with you.
Looks to me issue with Evaporator.

[ddkk0099]

This is compressor capacity that software is calculating based on operating conditions. Liquid is water.
I need to have more capacity.

[ishaitz]

Hi,

Currently I am working on 18 TR (63 Kw) chiller system. Operating parameters are as below :

Suction pressure (Psig) - 100.383
Discharge pressure (Psig) - 427.092
Superheat (K)- 8.83
Subcooling (K)- 10.46
Flow rate (m3/h) - 8.58
Water in (Deg C)- 11.8
Water out (Deg C ) -7.05

Water capacity that I am geting is 47.63 Kw. When I checked on compressor software, it should deliver around 59 Kw.

Can anyone help on what can be done to improve capacity of system.

How do you measure exactly Subcooling?
Where do you measure liquid pressure and temp?
What is the nominal flow according to manufacture?

If you are sure this is the correct data.
Looks like you Evap approach is a bit high.
I think you should look inside to make sure evap is clean.
Check also filter mesh (opening of the filter).

[ishaitz]

How do you measure exactly Subcooling?
Where do you measure liquid pressure and temp?
What is the nominal flow according to manufacture?

If you are sure this is the correct data.
Looks like you Evap approach is a bit high.
I think you should look inside to make sure evap is clean.
Check also filter mesh (opening of the filter).

Also please share ambient temp and capacity tables of the unit.
How old is it?

[ddkk0099]

Hi, I am having discharge pressure and liquid line temperature. So, I can calculate the subcooling easily. Ambient is 35 deg C and unit is new

[ishaitz]

Hi, I am having discharge pressure and liquid line temperature. So, I can calculate the subcooling easily. Ambient is 35 deg C and unit is new

Please answer fully to all of my questions.
It is not necessarily accurate due to pressure drop.
Usually I measure liquid pressure on liquid line it self.

By the way, any pressure /temp drop on that liquid drier?

[ddkk0099]

Subcooling I am measuring by discharge pressure and liquid line temperature jaround 15 cm from condenser outlet.

I haven't measured air flow rate.

0.3 K temperature drop across drier which I believe is Ok

[dandyme]

OK, I have yet to see where the complete model & serial have been divulged; although asked for at least twice. Is the some super "00" spy unit or something?
Learn to verify what the program is telling you as being true.

[supers_5]

. Liquid is water.
.

Open or closed loop? If open, is it a dirty process? Has the water been treated? Filtered?

I agree that the approach is a tad on the higher side at 13.2°f. Probably could use a cleaning. If there is a water filter, clean /replace it.

Also SST is a bit low. I wouldn't be surprised if it was shutting off due to freeze protection occasionally.

[ddkk0099]

Thanks for your comments. It is in closed loop. So, message coming out is that I need to check on evaporator side.

[supers_5]

Thanks for your comments. It is in closed loop. So, message coming out is that I need to check on evaporator side.

Yea.

Like I said, if there's an inline water filter, change it. If it's a strainer, clean it. What is the rated water flow of the unit?