Has anyone had any experience with installing ultrasonic humidifiers? The literature claims that there are significant savings in energy cost as compared to electric type humidifiers. I have a AHU that supplies a 24/7 telecommunications room. Does anyone know what the advantages and...
I would like to get some of your thoughts on the use of a VAV system with a main bypass damper on a RTU versus a system with a RTU and terminal unit bypass boxes dumping into a ceiling plenum. The project is a reletively small building 12.5 tons of cooling (approx. 5,5500 cfm). From what I've...
Hello,
I am involved with a renovation to an exisitng 5 storey hospital in Winnipeg, Canada. There is a new 2 storey front entrance going to be constructed and connected to the exisitng hospital. 2 hour rated firewalls will be used between the new entrance and the exisitng building such that...
Hello,
I am working on a new 2 storey front entrance to a hospital with large south facing windows (see attached sketch). The entrance will be used to connect people to the main hospital and a doctor’s clinic. It will be equipped with seating along the south and east walls and include a water...
I have an existing hospital that is going to be adding two isolation rooms with a common ante room. The existing HVAC system is a constant volume dual duct system. I was thinking of using two separate exhaust fans (one for each room). Each room would be supplied with its own dual duct box. It...
I am trying to calculate the perimeter heat loss in order to design a radiant ceiling panel system (supplementing the building AHU system). The area is the top floor of a hospital. I have calculated the transmission loss through the walls, windows and infiltration. Should I be adding in the roof...
I haven't encountered this problem before so I hope someone can provide me with some help. I currently have a lab room that is supplied with 180 cfm (being fed from a ceiling mounted heat pump). In the room is a recirculating bio-hood that the owner wants to convert to a fume hood, which will be...
I am just wondering what some you are doing when sizing your fans to incorporate the friction loss of a filter. For instance I have a situation where I need 2000 cfm and a MERV 13 filter. When I go to the manufacturers literature I find that for 2000 cfm the pressure drop through a 2" filter is...
I have a data centre that requires 60 tons of cooling. Based on a report the project engineer did, the design is to use a duct loop and have the diffusers discharge into the cold aisles (See attached skech). We will require each to operate in order to satisfy the cooling load. AC-1 unit is...
I am dealing with a retrofit project where an existing training room (approx.1025 sf) was modified to 5 office spaces (approx. 950 st). The existing roof-top unit (RTU) is a 7-ton constant volume unit (DX cooling). It originally supplied approx. 2,400 cfm to the training room. The system has...
I am working with a client who has an exisiting multi-zone air handling system (approx. 33 yrs old) with DX cooling and hot water heating. The building is two story ofice buidling with approx. 15 zones (there doesn't seem to be any purpose to the choice of zones and with renovations over the...
We have been designing quite a few fire pump systems lately and in the past have usually specified the typical test header arrangement (flowing water through 2.5" hose valves) for testing purposes. I am wondering though if going forward we should also be specifying a closed-loop metered by-pass...
I am involved in a project for a correctional facility located outside the city limits. The facility has a fire pump to provide water for their sprinkler system and a separate diesel fire pump taking water from the river to supply only fire hydrants. The exisiting hydrant pump was installed in...
Hello, I'm relatively new to the HVAC and HVAC controls industry and one of the projects I have been involved with is upgrading the ventilation system controls for an existing diesel generator room that is not working properly. The existing room is equipped with an O/A damper, return damper and...
I have large building with a number of sprinkler headers located at various locations. The building fire protection system is to be supplied with a reservoir and a vertical turbine pump. Based on hydraulic calculations of the sprinkler systems, the system futhest from the water supply has a...
I am dealing with a client who has a circulating pool system. The idea is to collect drain water from a splash pad (using a storage tank of some kind) transfer it to a surge tank (existing), filter and chlorinate the water and then send it back to the pad. We need to pump around 200 gpm of...
I am a professional engineer with 8 years experience with a fire protection contracting company. The company has been declining for the past year and most senior members have already left for the competition. I am not interested in moving to a competitor and have been contemplating leaving the...
I am a mechanical engineer in Canada with 8 years experience in the construction industry designing fire protection systems. I have been looking to move into a consulting company and have noticed that the job descriptions usually require experience in HVAC/Plumbing/Fire Protection. Over the last...
