Chillers Replacement Plan

What does the Client want? What does it say in the User Requirement Statement document for this project?

After all, it isn't possible to read it from here.

the Client want to improving Performance of the HVAC service, And these are one of my duties functional, But I'm still new graduates.

Get a mentor.

Without SOME details, it's impossible to teach you properly.

This forum cannot educate you from the other side of the world.

As PWSlack has said, get a mentor.

Thank you very much

sure, good luck with your project.

Please see recommendation on chiller replacement Plan:

1. are the existing chillers compressors is reciprocating, screw or centrifugal design? - above compressor's has respective KW/ton ratings which you must understand. - Centrifugal chillers has a range from 0.45kw/ton to 0.6kw/ton depending on manufacturer supplier ratings and for recip compressors has a design from 1.5 to 2kw/ton range.

2. Please advice if chillers are easily accessible for site replacement, if it happens to be under the basement, you may consider stripping/disassemble the compressors, evap, condenser and motor etc. and reassembly it again.

3. Other to considers to improve plant capacity are as follows:

a. replace starters with VFD's - but check if motors are designed for VFD application.

c. check AHU's coils if require coil replacement or need to replace with highly effecient AHU's.

Should you need more info, please feel free to contact me at CR4. or you may inquire reliable companies that offer new installation without cost to client - but they will charged your company based on the current electric consumption of your Plant within a certain period and they will also handle the OPM during that period.

Nelson/Dubai - +971502487606

You should have posted this under Mechanical Engineering to get more response. You need not replace the AHUS/FCUS or ducts as long as they are in good working condition. Include a clause in the chiller replacement specification that when new chiller is installed and commissioned it needs to be integrated with the existing ac units and deliver the required conditions as specified. Ensure to procure chiller with environmental free refrigerants.

Abdullah,

Some more suggestions:

-Find out what is driving the need to replace the chillers. Speak to the person who originated the product to gain total understanding.

-Speak to the technicians who work on this equipment. Make sure they agree that a replacement is necessary. Ask them if any other equipment needs to be included in the replacement plan.

-Whenever possible, replace with units that are more energy efficient.

-Your solution should be safe, highly-reliable, and easy to access, clean, and maintain.

Mr Abdullah

Its better to replace air handling and the fan coil also. Because new chillers are more efficient than the old one and others units are most likely not suitable with the new chillers. Go with IVs chillers now in the market. Go to Armstrong pumps.com to get full information on pumps and chillers. Good luck

Abdullah:

Replacing your existing chillers with variable speed, variable flow centrifugal chillers will improve their efficiency if the chiller sizes are compatible with available centrifugal machines. In general you would not need to replace the AHUs but you may need to change the chilled water control valves. For variable flow operation you need to have 2-way valves on the CHW coils, not 3-way valves.

Another common problem affecting chiller system efficiency is low delta T syndrome which is due to excessive chilled water supply flow returning to the chiller before it has picked up sufficient heat to raise its temperature. This can be due to 3-way valves, excess CHW flow through coils, improper bypass operation, or improper coil design. The coils in your AHUs were designed for some delta T, typically 10 or 12 degrees F, and depending on their age, some of your coils may be designed for different delta Ta than the chillers. If your new chillers are specified for 12 degrees delta T but your coils are designed for 10 degrees, you will not realize the full capacity or efficiency of the new machines. However, it's much easier to change coils (if needed) and control valves than entire AHUs, unless the AHUs need replacement for other reasons.

Though I agree with Fredski to a point the easy answer is no, but that is only for the down line sources that the chiller feeds, if water cooled. If it is an Evap condenser or cooling tower that is feeding the condenser for the chiller they will need to be looked at and flows adjusted or lines changed to accommodate to the new refrigerants used.

These items will also need to be added to the plan for assessment.

Thanks to all

It is a Valuable information

I will work to ensure the success of our Project.

Regards,

Abdullah Al Showaier