Selection of chiller

[shiv...@gmail.com]

Hello All,

 

I am in the process of selection chiller plant for a hospital building.

 

This hospital building is coming up in chennai and has six floors.

 

There are 14 operation theatres and one ICU in each floor except ground and third. The overall HVAC load is working to about 750 TR.

 

I intend to choose 2 x 400 TR chiller units, (water cooled) each with more than one compressor for redundancy.

 

One of the leading vendor says that centrifugal chillers with magnetic bearings + VFD are available in India and are very efficient, while mentionng the drawbacks of screw chiller.

 

The other leading vendor says that screw chillers (either with mono or dual rotors) are more effecient while mentioning the drawbacks of ecntrifugal chiller and that too with magnetic bearing+VFD.

 

I understand that both these machines are good but I am not sure which is better under a given IPLV condition. As this is an hosiptal, I am snot sure what will be the part load. I also understand that the OTs will be used only for about 4 days in a week and on any given day only about 60 % of the total no. of OTs are expected to work.

 

This is an Goverment owned hospital and I do not wont the public money to be wasted on either inappropraite selection of the type of chiller or thier capacity.

 

Thanks in advance.

 

Ramesh.A 

[Arun]

Dear Ramesh,

This is a good idea to save energy on the public buildings. Looking at the options to choose from

And the confusion over the system selection, I may suggest to do a computational analysis of the building. This is a very typical situation, and simulations tools are the best fit to optimize on your investment, even for a public building!

You may start looking at the two things basically:

1) the system size, location, and requirement analysis of the TR including some data analysis of similar size public hospital building in the region

2) take help of historical data to identify the right balance of systems. Water side centrifugal chillers along with economizers and waste heat recovery systems can be ideal choice. But this has to be bagged by the real time and annual situational data.

We have worked with public buildings in Tamil Nadu and buildings in Chennai with warm and humid weather conditions it is difficult to design right balance of climate solutions. Why don't you share the details of the system specifications and building plan with community to ideate further. Hope this helps.

Best regards,

Arun Bhandari

ECUBE solution

Bengaluru

Sent from my iPhone

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