With April showers well on their way, one customer asked the question, “How does all this rain affect my HVAC system?”
Bruner Engineer John Mrofchak has the answer:
An air cooled condensing unit could operate more efficiently with a lower discharge pressure when it is raining outside or when cooled with moisture. However, air cooled condensing units are typically not designed to be continually sprayed with moisture. Continual moisture could create several issues, including electrical, compressor, and condenser coil damage.
Compressor damage could result by water spray overcooling the condenser, and liquid refrigerant returning to the compressor. Compressors are designed to compress gas, not liquid. The refrigerant in an air conditioning system changes state from liquid to gas as part of the air conditioning process.
The condenser coil could be damaged by poor spray water quality. Another type of outdoor condensing unit is an evaporative condenser. If you have an evaporative condenser, you’re in the clear; they are designed to be continually sprayed with moisture.
For a more detailed explanation or assistance preparing your systems for the influx of moisture, contact Bruner Corporation at (614) 334-9000.
Nationwide Children’s Research Building III is nearing the end of the installation of the building’s plumbing and medical gas lines after almost two years of field installation work. The seven-story building is roughed in and final connections to medical outlets, building equipment and fixtures will be made throughout the next 30 days.
Nearly 15,000 linear feet of medical gas copper pipe serve the wet labs on levels four and six, distributing carbon dioxide, oxygen, medical air, and lab gas. Over 17,000 linear feet of domestic water copper pipe has been installed, with more than half of that being located in the lower level vivarium. These lines feed the faucets, drinking fountains, emergency shower and eyewash stations throughout the building. The lower level vivarium also required a specialized drinking water distribution system specifically designed for small and mid-sized animals. These 2,600 linear feet of fire rated plastic pipe were brought in from a design and manufacturing company based out of California to supply clean water to over 200 distribution stations.
Currently, Bruner is working in conjunction with other final trades companies to ensure all sinks, faucets, eyewashes, and bathroom fixtures are set properly. Final items to be completed by other trades include installation of cabinetry, floor tile, drywall, and ceilings; painting; and installation of lab-specific structures to house medical gas lines.
Life Safety for the building is set for February 6, 2012, meaning that all plumbing work must be completed and inspected by that time.
Bruner’s work as on the Ohio State University Medical Center Tunnel project began mid-2010. As we near the end of 2011, Bruner’s team is working hard to meet deadlines, complete tasks, and prepare for next year’s challenges.
At its inception, the project involved a utility tunnel relocation providing high pressure steam and chilled water to OSU Medical Center’s new Cancer Critical Tower, along with distribution to other main hospitals on the Medical Center campus. Feature of the project include:
- Chilled Water Piping
- 1,600 lineal feet of 36” extra heavy carbon steel piping
- 900 lineal feet of 42” extra heavy carbon steel piping
- 500 lineal feet of 24” preinsulated underground piping
- High Pressure Steam and Condensate Piping
- 1,000 lineal feet of 12” seamless carbon steel piping
- 1,500 lineal feet of 8” and 6” stainless steel piping
The goal of the mechanical upgrade was to result in greater efficiencies and savings in operational costs and energy in adjacent Medical Center buildings.
As we sit here today, the main piping systems for chilled water (CHW), high pressure steam (HPS), and pumped condensate return (PCR) for all remaining sequences in the Tunnel project are nearing completion. The Bruner team is also preparing for hydrotesting of the CHW piping, which will begin in mid-to-late January 2012. In the following four weeks, crews will focus on small bore piping and specialties as they prepare for the steam blow operation to begin in May 2012.