energy consumption is very high-centrifugal chiller
energy consumption is very high-centrifugal chiller
(OP)
Our two buildings, assume building A and B. equipped Mitsubishi centrifugal chiller. The electrical consumption in 2015 as below mentioned. Capacity is approximately same. Now I am taking details to analyze the reason the huge consumption for building A. I already conducted the primary survey on building A. I found the building automation is out of order. Chilled water delta t is not maintained as design. (In building B also, the automation system is out of order). Now I am collecting all details to find out the cause. The problem is the same operation quality follows for two building. Except the condenser pump is placed in building in ground floor.so its power is high compare to building B. I will update more details. Your any comments on this really appreciated.

thanks
moideen-dubai

thanks
moideen-dubai





RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
I didn't double-check your numbers, but there is a 960 ton chiller plant with 960 gpm, how do you get 2 gpm/ton?
what are actual dT?
You say controls are bad.. i'd say fix that and ensure chiller operates as designed to begin with. then think of improvements.
RE: energy consumption is very high-centrifugal chiller
Is the hot (red) side for heat in winter and the green side for cooling in summer??
My comment is that we have virtually nothing to go on.
Is building A in the sun more?
Did the residents have the AC on for longer?
Did they have it cooler than building B?
There must be something major between the operation of the two buildings to be approx. 3times as much power.
What are you using for tonnes to kw consumed?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
what are the numbers, 2708333, 879167, 14423077, 152243549 and what are the units (dollars, KW/H, ..etc.)
RE: energy consumption is very high-centrifugal chiller
Now winter started here, chiller works now in part load, delta t is 3.7f in chiller and CT range is 3.7F.
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
Are these systems primary secondary, and if so, how do you maintain the primary secondary flow relationship?
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
The 70 m likely is the pressure at no or minimal flow.
RE: energy consumption is very high-centrifugal chiller
RE: energy consumption is very high-centrifugal chiller
and are you operating as intended? for example maybe only two pumps should ever run and 3rd is reserve (N+1)? how do you know 575 gpm is the right number?
and again, in a 2-valve system flow will vary depending on load.
how do you intend to check the flowrate? What pump is it that the manufacturer doesn't have curves on their website?
too little information for us to judge, and i still think your schematic is incomplete, or that is a weird setup.
RE: energy consumption is very high-centrifugal chiller
Full load hours = Annual kwh/(kw of chiller and auxiliaries)
Approx kw of chillers & auxiliaries = .5 for chiller + .1 for pumps + .1 for cooling tower = .7 kw/ton