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Just to clarify the exhaust fan will be located very close to an outside wall and will have a duct run of ~10 feet before it exhausts to the outside so the static pressure will be quite small.

Wanted to get folks opinion regarding best fan for an exhaust application. Purpose of exhaust fan is to control static pressure in the building. The building will be in full economizer ~70% of the time. When the building is in full economizer the exhaust fan will run. The exhaust fan will be...

I have a project where we are installing two (2) new 12 ton McQuay Vision AHUs in a stacked configuration. The AHUs will be installed in a new mechanical room. The mechanical room will be located on an outside wall so we will be providing an exhaust air louver to provide full economizer...

I have an application where I need to specify a pump to move approximately 6 to 10 gpm of diesel fuel from a commercial building basement to a 15th floor penthouse where the building's generators are located. One of the pumps needs to run off of AC power and the other pump will ideally run off...

We are looking at purchasing HVAC energy analysis software. We are looking at all the big names i.e. Trace, DOE-2, HAP, etc. I'd like to get some recommendations and reviews of the various programs in an attempt to make a more educated decision. Thanks.

Thanks for the replies. A couple of thoughts. Imok2 - How much money are we really talking about saving in reality? Chiller electrical costs will remain essentially the same I believe so the main area we are saving energy cost is in pumping costs. The pump minimum threshold I think will be...

The humidifier is downstream of the cooling coil. It's the previously humidified return air that is causing the problem I believe when it condenses on the cold outside air dampers. The supply air temperature setpoint is 50 degrees.

A client has asked for a new chillled water plant for a medium sized building. Air cooled chiller feeding the chilled water plant will be sized at approximately 100 tons. This chiller will feed 5 or 6 separate chilled water air handling systems. I'm evaluating pros/cons of designing the...

An owner has asked me to look at an existing condition in a very cold weather climate facility. The main mechanical room is located on the outside wall of the building to facilitate economizer operation. The outside air louvers and outside air dampers are located on one of the mechanical...

I'm reviewing an existing site that has two chillers in parallel. One chiller is sized at 120 tons nominal and one chiller is sized at 40 tons nominal. Both chillers operate off of a single pump. I'm trying to use the existing equipment more efficiently but it seems that if I use only the 40...

What is a typical value that is used for sizing chilled water piping. I've heard that 10'head loss/100' of pipe is a good rule of thumb. Any advice is appreciated. Thanks.