Questions about adding Additional Chillers

[swood5053]

Hello, this is my first post i believe and I was wondering if I could ask some questions. I am currently an engineering intern at a company right now and they are wanting to know if adding an additional chiller would be cost efficient. First:
From a 6 million gallon tank water is stored, then pumped at a rate to a chiller. If two chillers are in line to cool water then would that mean that the Tonnage use on each machine go down or would it multiply by 2. The chiller is rated at 1300 tons.
Well I guess that is my only question for now. Thanks in advance for the advice!!

 

[CH5OH]

the chillers are used to cool the water in the storage tank?
the 1300 tons is the flow of water?
the reason for the tank being temporarily higher flow requirements (>1300 tons)?

 

[IRstuff]

Cost effective as measured by what? You've not given sufficient information to tell that the driving requirement is. Why do they think they want a second chiller?

TTFN

FAQ731-376

 

[swood5053]

The 1300 tons is the Q dot or heat transfer rating like on an air conditioning unit. When the water that is being chilled is not being sent to the condensers in front of the turbines, it is being stored in the tank and continuously chilled. After doing some calculations yesterday I kind of found the answer to my original question which was, will the tonnage rating go down or up. It will multiply by 2 and the time to chill the tank will be cut in half. So for every 3 degrees lower the water temp is going into the turbine condenser ='s 1 Megawatt of extra power produced. So I thought I would just follow up with this and I appreciate the replies. I am sure as my career goes on, I will be able to formulate better questions for the forum!!

 

[IRstuff]

Cost effective as measured by what? You've not given sufficient information to tell that the driving requirement is. Why do they think they want a second chiller?

TTFN

FAQ731-376

 

[swood5053]

I will try to give a good answer since you are asking the same question again. The cost effective part is: can the plant generate enough extra power when the chillers are running to make up for that extra 3/4 MW/hr loss over a certain period of time. Since adding an additional chiller could help the turbine produce an extra 3 MW's then it is cost effective when the water is running through the turbines. As far as is it cost effective when the chillers have to run to get the tank back down to a certain temperature to start the whole process over, that has yet to be determined by my calculations. That is what I am working on today.

 

[IRstuff]

" The cost effective part is: can the plant generate enough extra power when the chillers are running to make up for that extra 3/4 MW/hr loss over a certain period of time"

> That's a cost question, not a cost effectiveness question

I don't know that you've yet described the problem. The question should be:

What benefit offsets the cost of the extra power comsumption, cost of the chiller, and cost of maintenance of both the turbines and chillers?

Presumably, this has something to do with the turbines you only now mentioned, and whatever benefit is gotten by running them harder, or longer. If the benefit of this is higher than the costs I mentioned, then it's "cost effective," otherwise, it's not.

TTFN

FAQ731-376

 

[CH5OH]

is that what they referring to when talking about reversed engineering:
placing a condensor in front of a turbine (lol)
would be intresting to see the whole installation...
if you talking about a steam turbine, consider the condensor to be on the back end.
if you talking about a gasturbine, its not very efficient to make the inlet air denser with a chiller unit
what you can do is moisterize the air inlet stream but keep the droplets below 1 micron to prevent ruining of your first row of compressor blades (HP fogging)

 

[chicopee]

After reading this post, I think that newly graduated engineers should taken at least one course in technical writing.
I still can not make sense of what swood5053 is trying to convey. May be it's me. A sketch may help.

 

[willard3]

That's two of us. I don't understand your question.

Drop the jargon given you by others and ask the questioin simply.