Advice for minimizing chilled water use in server room cooling
Advice for minimizing chilled water use in server room cooling
(OP)
I have a small office space in a research park which I'm using to house a 42U rack of servers. Specs by equipment manufacturers put my cooling demands around a ton.
The building has a chilled water system and bringing it to my space shouldn't be too big a deal. The park would bill me solely on chilled water volume, not temperature rise.
So... what kind of equipment should I use to provide my cooling and use the least amount of chilled water possible. I've googled fan coils and found most of them in my range use at least a gallon per minute with cold water return only 10F higher.
Any advice appreciated,
Thanks
The building has a chilled water system and bringing it to my space shouldn't be too big a deal. The park would bill me solely on chilled water volume, not temperature rise.
So... what kind of equipment should I use to provide my cooling and use the least amount of chilled water possible. I've googled fan coils and found most of them in my range use at least a gallon per minute with cold water return only 10F higher.
Any advice appreciated,
Thanks





RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
Chilled water supply should be between 4-7C. The office is pretty near the start of their loop. The room temperature is currently too hot at 25C. Relative humidity should be around 50% +- 10% for server rooms. I'm not looking for an ice-locker, just for bringing the room down to 19C
The room is currently cooled by a passive radiator panel and two dx portable air conditioners. The air conditioners aren't that effective because they're only exhausting to the plenum which isn't circulated sufficiently to handle the heat load.
RE: Advice for minimizing chilled water use in server room cooling
1 gpm doesn't seem like a whole lot to be fretting about. You will probably need more like 2.4 gpm for a 1-ton unit(with the 10 deg delta T). Either way, run 3/4" chilled water pipes to the unit and neck down to the connection sizes (probably 1/2"). It doens't get much smaller than this in terms of chilled water based air-conditioning. The actual usage (gpm) will vary if you have say a 2-way modualting control valve. Is someone going to meter the usage and bill accordingly?
If the server stuff is critical, you might want to check out fancier stuff than standard fan-coil units. Liebert, Mitsubishi, etc. Then you could perhaps have something with a dx primary system with chilled water as a secondary stystem. Computer room air conditioing equipment will also have reheaters, humidifiers and other things to maintain more precise temperature/environment control in the space (at a cost of course).
RE: Advice for minimizing chilled water use in server room cooling
RE: Advice for minimizing chilled water use in server room cooling
When you jump up a case size as the temperature difference increase you will probably have the best selection, though might be worthwhile to see the payback would be with the larger unit?
Also get a CRAC unit with EC fans to reduce fan power consumption.
RE: Advice for minimizing chilled water use in server room cooling