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Please check the design to see if there are any exhaust dampers on the system. I have seen hospitals being designed with a purge system that allows the air handling system to function on a 100% fresh air mode. Usually the purge cycle is done in the morning when the temperature is favourable and...

I would suggest a course in Revit MEP and look for opportunities to work as a Revit MEP designer with either consulting or contacting industries. As you gain more experience as a designer you can move up to an engineer role. You can utilise your operational and maintenance experience to create...

A buffer tank or a balancing tank with hot/cold well is very common in all production facilities requiring process cooling. The chiller capacity and production demand is never going to match so you need a buffer to stop the chiller from cycling on/off.If the production load is of short duration...

VRV system will be obviously cheaper. You can save more by using ductless systems. There is also cost saving as the VRV system comes with its own control system so you may not require a full on building automation system required for chilled water systems

There is a limitation on the number of times the heat pump compressor can start in an hour usually not more than 6-7 times in an hour. Therefore you need a buffer storage tank that will smoothen the fluctuating field flow requirement. This buffer tank sizing will also take into account seasonal...

You can solve the problem by supplying ventilation air at a neutral temperature say 21C.The ventilation AHU needs to cool down to at least 13C( or lower as allowed by the chilled water flow temp) to wring out all moisture from the air and then reheat it to 21C.This is how it is done in hotels...

VPF is not a panacea for all new buildings. Its use is limited to simple designs. A more complex campus like building layout still requires the conventional primary-secondary system. Functionality is more important than minor improvement in energy efficiency.

Thanks for asking a good question Smali1! This is how you do it: Before you start the balancing process you isolate a certain number of AHUs/FCUs equivalent to 250 tons in your case. You start the pump and balance the operational units at their maximum design flows. Once you accomplish the...

If I understood you correctly some of the VAV boxes have air flowing in reverse direction when the AHU is shut off. This means the space is at a higher pressure/temperature than the duct and air is flowing out of the space through a path of least resistance. The exfiltration could be due to...

The only way to prove acid wash caused it is to send a sample to a lab for analysis and get their opinion on the reasons for corrosion

It was not very wise to use a metal duct for burying underground. FRP or HDPE would have been better choices. Aluminium is not well known for strength so typically I have always used a gauge higher than recommended when I needed to use Aluminium in places like MRI rooms etc. So it is worth...

As trashcanman said these coolers will not work in SEA.I have worked and travelled throughout SEA and I have never seen them in use anywhere. Do not fool yourself and the poor workers who need to live in this horrible environment!

You need to challenge your consultant for specifying something that is not available in Egypt. They should have researched it before specifying it. It is not going to be economical for your client to fly out duct cleaners from the US. These certifications are a ticket clipping business in the US...

Divide the AHU rated flow by the number of G4 filters you have now and that should give you air flow required per each G4 filter. That should be enough to order a new G4.

Chasbean1 Long time no see! where have you been? Hope to see you here often!

Why not heat trace the pipe rather than wasting energy on heating a large space?

I would go with a blending valve set to couple of degrees higher than 55F(a portion of water going through the tower fills and the balance bypassing the tower completely)

BronYrAur, Where are you located? It looks like you are in a mild climate location. If you bypass the entire water flow away from the tower, the temperature rise on startup will be very quick and may trip the chiller on high pressure cutout. Based on the line-fill volume you can calculate how...

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?

The general live loading allowance for the plant room is 5.0 kPa and 4.5 kN concentrated point load. You may find the information on your building design brief or structural drawings. If the information is not readily available a structural engineer may be able to back calculate the figure for...