replacing the air cooled to centrifugal chiller.

[moideen]

Dears,

We are planning to withdraw our 14 year old TRANE RTAA chiller 456 ton capacity (2 No chiller, each 228 ton total 456 ton,unit model RTAA 328) and replace with either same like air cooled chiller or new water cooled centrifugal chiller. We are advised by Mitsubishi to install ETI series 450 ton centrifugal chiller and the water cooled system shall have a power consumption of 0.8 KW against 1.6 KW the existing trane chiller. The additional investment of water cooled system can cover and pay back within 2.3 year by analyzing the local electrical and water cost. I would be interesting your valuable opinions,
1. Is better to replace same brand air cooled chiller
2. Comparison the centrifugal chillers of trane vs York vs Mitsubishi vs carrier.

Regards
Moideen-dubai

[dlove]

my two cents, factor in chemical treatment and PM maintenance on all equipment to support this. But the pay back on either one is good.

[jdblack]

Water treament will be a major focus. If preventative maintenance is an issue go air cooled. Much easier to clean coils then brush out condenser barrels.

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[Nuclrchiller]

Much easier to clean coils then brush out condenser barrels.

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That's a matter of opinion.

[pecmsg]

That's a matter of opinion.

X2

[ga1279]

moideen- One other thing to think about you could cut down on your maint. cost by using a McQuay WMC. There is no oil and KW/ ton is a lot better then .80, something to think about. -GEO

[KnewYork]

One other thing to think about you could cut down on your maint. cost by using a McQuay WMC. There is no oil and KW/ ton is a lot better then .80, something to think about.

I think he's referring to total system kW. A York YK with VSD will do a whole lot better than .8 kW/ton as well. I think one of the problems with a Turbocor compressor in Dubai is the likelihood that it would run a full load more than it may here in the States. Turbocor compressors don't perform as well at full load as many of their competitors.

[motoguy128]

That's a matter of opinion.

That's a matter of water treatment. With good water treatment, I've heard of units going year without beign brushed.

Cooling towers in many climates need to be cleaned as often as condenser coils.

[dlove]

I don't understand how the pay back can be the same for both systems. I also, would not bet on the ROI to be 3 years. If they agree to get payed over the the time period they say it will take to get your ROI then they would have a vested interest in making sure they were right. (don't hold your breath) Every time i hear 3 year ROI i double it. I would forecast the next 5 years of water cost and electrical cost. if cost of water, and electrical goes up this would effect the ROI period. Unless you already added in the increases. DO you pay for sewage waste?

Also, are there any other buildings in your area that has water cooled and are about the same size as yours? If so i would talk with them and get their input. Not sure of the water chemistry but, depending on the type of water you have towers can be the bane of your life.

Personally i would stay with what you have and make repairs. I would imagine the capital cost comes out of your bottom line. Do repairs come out of common charges? if so why would you dump all that money in a new system? Just wondering, I would think if you took that money and properly invested it, the return would be greater than what you make on the savings over the next three years. -just saying. The ROI will always be there, whether you do it now or later. Unless they are making you a deal you cant refuse.




anyway not to get to far off track. Overall not knowing all the little details. Unless the entire systems is failing i would make repairs. If you have the money and just want to save money and they really believe they can get you a 3 year ROI, Then that's great, all new equipment today will save money, much has changed over the last 10 years. But again, Who can support for the equipment your will buy. If there is no local support for this new equipment or there are only a few who can work on it, i would shy away.

[Southern Mech]

That's a matter of opinion.

X3

[KnewYork]

You might want to consider another manufacturer. I know of one (York) that does not require any scheduled overhaul interval and I have seen many compressors run over 75,000 without ever being opened.

[ga1279]

My apologies to one and all as I jumped the gun with my last post, I did not realize the area we were discussing. Water treatment will be costly as your make-up water will be high and fresh water is costly there to begin with. 14 years of life out in that climate, hell I've seen them in Houston that don't last that long.-GEO

[Tech Rob]

I'll take tube-brushing over coil-cleaning any day!