Heat exchanger

[Jeremy325]

I have a 30 ra030 with a scaled heat exchanger planning on cleaning it Saturday. Carrier says use 5% hydrocloric acid. Has any one had any luck cleaning one. Chiller is about 7 years old with no water treatment.

[Dallas Duster]

Did you check the strainer?

[Jeremy325]

Yes check pump curve also. Pump is doing more than it needs The approach was over 15 degrees if I remember correctly. Have a 10 psi psi drop across heat exchanger

[R123]

If your pumping more than it needs, then your approach and pressure drop across heat exchanger is going to be high. Also, you can have an oil logged heat exchanger. Is this a shell and tube heat exchanger, or a plate frame heat exchanger?

[Jeremy325]

This is a plate heat exchanger.

[Dallas Duster]

This is a plate heat exchanger.

Ou should be able to pop the Vic's off and take a peek in there and see if anything looks bad.

[Jeremy325]

Ou should be able to pop the Vic's off and take a peek in there and see if anything looks bad.

U can take it apart?

[R123]

U can take it apart?

No, you can pull the Victolic fittings off (chilled water connections), and look inside.

[R123]

What is the design pressure drop across the heat exchanger? What is the design delta T?

[Jeremy325]

The design pressure drop is 5-1/2 to 6 psi The design delta is 10 degrees

[R123]

Try slowing your flow down to achieve design pressure drop, load chiller to 100%, and see if you achieve design delta T and check for an improvement in your approach.

[Jeremy325]

Will do thank you. I spent all day up there to day running a hydrocloric solution Did not get a lot out of it. I don't have balancing valves I have full port valves on both in and out. Which one do suggest throttling down?

[R123]

Will do thank you. I spent all day up there to day running a hydrocloric solution Did not get a lot out of it. I don't have balancing valves I have full port valves on both in and out. Which one do suggest throttling down?

Outlet of chiller.