Has anyone on here worked on a hyperscale data centre?I am trying to get an understanding about the fanwall/coil wall system used on such projects with a side wall air distribution arrangement.Are there any pitfalls with such a system such as uneven temperature profile across the data hall?
I was recently looking at the design of HVAC system for an apartment building in the Middle East. The apartments are cooled by chilled water fan coil units. There are couple of central chilled water Air Handlers on rooftop that conditions the ventilation air and distributes to various...
The claim is that fresh air can be cooled below wet bulb temperature without refrigeration.Has anyone on here used/come across this product?
http://www.climatewizard.com/
A chiller plant with VSD chillers,VSD condenser water pumps,VSD cooling towers.Though each of the VSDs will help save energy,you would need a software programme to find the sweet spot( point where it consumes lowest possible energy for a given output.Has anyone used such plant optimization...
Recently came across high corrosion in an underground fire ring main of MS construction(no coating) that runs on top of a mains electrical cable feeding the site.My understanding is that stray currents caused by a DC field can cause corrosion in pipe lines.Can an AC field cause corrosion in...
I am looking at the existing condensate metering system at a site where there is a wide gap between steam flow rate and condensate flow rate(condensate being about 40% lower).The condesate is pumped back to the feed tank by means of pump trap units which produces a pulsating flow.The flow rate...
What should be the capacity of a softening plant( in litres/hr) for a 3 MW boiler @1000 Kpa.All condensate is being returned back to the boiler.Any guidelines/ basis for working out the make up rate?
What is the ideal design velocity for a pump discharge header pipe that has multiple branches taking off from it?Is there any established guide line on header velocities?
I am looking at a large chilled water plant that has currently a flow rate of around 120 l/s.The header is 300mm dia.We need...
Most specifications inherited from grandfathers have an outlet velocity limitation of 10~12 m/s for centrifugal fans.Does anyone know what is the basis for this limit?Couldn't we use a higher out velocity (say 16 m/s )for fan selection?This may result in a smaller fan.An expansion fitting can...
Guys,
Please can you advise on the most suitable material(economical as well) for a cooling water system using sea water for the following system components?
Pipes ?
Valves ?
Pumps ?
Heat exchanger ?
Do I need to allow for any special filtraton systems?
Here is an interesting article on stair pressursation system design.In the article, there is an interesting comparison of widely differing stds used by different countries
Guys,
I recently learned that the induction type VAV systems using low off coil temperatures are becoming popular as you can use lower air flows and therfore smaller air ducts .Is it more efficient than a normal VAV system?I guess there will be an energy penalty on the chiller due to lower...
Guys,
I am supplying o.3 micron filtered air into the Production Suites of a pharmaceutical manufacturing facility.The air comes in contact with the product.Is it necessary to validate the compressed air generation system or is it sufficient to validate the system down stream of the fine...
Guys,
Please someone offer some guidelines for the design of aeration system for an in vessel compostor used for composting organic waste?I am looking for advice on spacing of aeration grates,velocities,pressure drop,methods of flow control etc etc
Guys,
I need to design a liqiud nitrogen tranfer piping system about 20~25 m long.The system consists of a main storage tank serving a few cryogenic freezers.I understand the flow will be two phase.
Do I need to provide a return line to bring the gas back into the main tank?
What sort of...
Guys,
Do we need to provide condensate traps in the compressor ring mains when the compressed air has achieved a dew ppoint of 3C or less either thru a refrigerant dryer or a dessicant dryer?I was told by some one they are not required as there is very little moisture left in the air leaving...
Summer design temperatures in most countries are 24C where as typical winter design temperatures vary from 19~21 C.What is the reason for adopting different temperatures for summer and winter from a thermal comfort perspective?
Guys,
I am looking into pressure swings in a manufacturing space at a particular time of the day.I believe this is due to the flow variation in the exhaust fan due to wind. The fan is installed on the roof and equipped with a side discharge.Does anyone have any good idea as to how to isolate...
I have a heat exchanger which condenses steam at the rate of 300 kg/hr.What should be the flow rate for the condesate pump?Should it be also 300 kg/hr or higher with some margin.Some one advised me it should be twice ie 600 kg/hr due to higher condesation rate during startup
