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Tue, Feb 16, 2010
Mechanical : Projects
Mechanical : Projects
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"You have done something truly remarkable here, and the rest of the world's eyes are on this."
Rick Fedrizzi, President
U.S. Green Building Council
H & H Industries was honored to be the HVAC contractor of choice for the new Aldo Leopold Legacy Center in Baraboo, WI. After final testing was completed, the Legacy Center was determined to be the highest ranked LEED building - in the world.
Nineteen geothermal wells feed five variable speed heat pumps which use renewable refrigerant. These heat pumps feed radiant tube flooring and underground ductwork to both heat and cool the building. The floor diffusers are architecturally pleasing wrought cast iron.
A fresh air "earth tube" system uses five rows of one hundred foot long, twenty four inch concrete tubes to cool air in the summer and warm it in the winter. After the air has traveled through the tubes, it passes through a UV light and filter, then to an air to air heat exchanger. The meeting hall has separate air to air heat exchangers to increase efficiency with different occupancy use. The in floor radiant heat system is controlled by a series of variable speed pumps, giving each zone its own control module. A sophisticated weather station provides data for outside air temperature, humidity, wind speed and direction. This information is used to determine when the building can switch over to natural ventilation mode. The weather station also helps monitor how closely the actual building performance tracks the design model. Sensors placed in numerous locations throughout the building monitor interior temperature, C02 levels and humidity. The HVAC system is also equipped with a series of manual valves and dampers used to switch the systems from summer to winter mode.
As a LEED engineered project, materials, labor and equipment were all provided from local sources. The architecture of the building incorporated timber planted by Aldo Leopold himself decades ago. The harvested lumber was then dried, taken to a mill to be cut up or skip peeled, then sent to woodworking shops and transformed into woodwork and trim. Materials used in construction contained certified post consumer recycled content whenever possible.
Energy for the building is provided by one of the largest PV arrays in the state. To date, the Legacy Center has received regular credits from the utility. The month of May alone generated a utility credit of over $180.
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Over 3 miles of steam pipe were connected, welded and buried beneath the streets on the west end of the University of Wisconsin campus. Boxed conduits between accessible steam pits were poured, filled with both steam and condensation pipes, then backfilled. Expansion joints are housed in accessible steam pits at regular intervals.
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Winner - 2006 Associated General Contractors Build Wisconsin "Specialty Contractor Award"
H & H Industries was chosen by Miron Construction as the HVAC contractor for the new Dane County Courthouse. This landmark building located one block off the Capitol square represents a major step forward for the Dane County legal system. The triangular building, gracefully placed at the corner of West Wilson and North Hamilton streets is a showcase for modern design and construction methods. The HVAC systems installed in the building ensure comfort for the wide variety of working spaces being utilized, each with separate control requirements. Rooms with varying sizes and occupancy rates mandated that a wide variety of heating systems be employed. Courtrooms, holding cells, briefing rooms, secure detention areas, break rooms, conference rooms, offices and more required a centrally based heating and ventilation system with multiple zones. With ten floors and over 230,000 square feet to heat and cool, scheduling decisions had to be made. These decisions directly affected the installation for piping, ductwork and equipment. Coordination between trades was a constant concern. Eight air handling units, three hundred sixty variable air volume (VAV) boxes, two chillers with three accompanying cooling towers, a high pressure steam system, perimeter hot water, extensive smoke control system and a driveway snow melt system all play a part in the interior comfort and external safety (no icy driveways) of the building. The elaborate wood ceilings designed for most of the courtrooms and conference rooms demanded exact measurements for placement of grilles and diffusers. This was further complicated by the slightly different design of each of the courtrooms. Secure holding areas meant that any ductwork six inches or larger had to be fitted with burglar bars. With the building located between two one way streets in downtown Madison, crew parking, equipment deliveries and material storage were major challenges. Delivery issues and storage limitations were solved with a unique material handling solution and a very organized delivery schedule. This project involved the installation of approximately 364,000 pounds of sheet metal. By careful coordination with other trades H & H Industries was able to integrate our systems seamlessly into the final construction.
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This $4.9 million HVAC public project was completed in May of 2002. The project was awarded on a GMP price with building use descriptions. H & H Industries implemented several design value enhancements including an engineered smoke control system and hot water system with higher temperature and higher delta T on coils. This reduced equipment sizes and building foot print tin the mechanical rooms.
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This $4.8 million addition to St. Mary's hospital includes new in-patient rooms, surgery suites, a cardiac rehab and laboratories. Six new floors were added, with the penthouse being one of the most impressive new mechanical rooms in the city of Madison. H & H also installed piping for snow removal on the new helipad. Nine air handling units were craned into the building's penthouse (see slide show), and are now complete with ductwork and piping. The air handling units range in size from 12,000 to 60,000 cubic feet per minute, with the largest containing over 60 filters. Concrete was poured inside the units as an "inertia base pad" to absorb the start up vibration of the large motors. Portions of the ductwork was so large it was necessary to assemble it on site after the individual pieces were fabricated and trucked over from H & H Industries' in-house sheet metal shop. Other equipment installed at St. Mary's:
- 326 VAVs (Variable Air Volume Units)
- 29 Steam humidifiers
- 17 Exhaust fans
- 18 Cabinet unit heaters
- 8 Hot water/ Chilled water pumps
- 7 Large return fans (the largest measures 12'x10')
- 3 Pressure reduction stations
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After the Mid-West Family Broadcasting project, the title of Sound Engineer can be added to H & H Industries' resume. Initiated as a Design/Build project, numerous meetings between H & H, Arnold and O'Sheridan, and Renschler Companies were held before final design documents were produced. These meetings ensured that the unique HVAC systems would fit within the building structure and the elaborate ceiling systems required for multiple radio studios. The building had three main functions: offices for management and sales, on-air and recording studios and finally, electronic equipment that keeps seven stations on the air twenty four hours a day, seven days a week. The three widely different needs required three separate HVAC systems. Because the equipment rooms have to be cooled at all times, reliability was the number one requirement. H & H designed and installed a Liebert computer air conditioning system to make sure the studios stay on the air. To back this system up, a damper system on the office air handling unit redirects conditioned air to the equipment room in the event the Liebert system shuts down. The equipment room has backup protected cooling systems. Noise elimination was the number one concern for recording and on-air studios. These studios needed to be constantly ventilated without the luxury of door vents or open doors. To deal specifically with this concern, H & H designed sound traps to prevent supply or return fan noise from emanating through the ductwork. To avert any possibility of air-flow whistles, oversized ducts were used to slow the speed of air moving to and from studios. Finally, the ductwork was designed with staggered duct branches to eliminate crosstalk from room to room. The system operates so quietly that building maintenance personnel have had check to make sure the air handling unit is operating. The offices required an upgrade from their previous building. Temperature control, humidity control, and improved filtration were the main concerns. The variable volume air handling unit gave the offices 40 zones of temperature control which could be adjusted individually. Humidifiers were installed to control static electricity. Air filters were enhanced to cartridge type, to ensure that dirt and dust would not be circulated through the duct system. This system has resulted in higher air quality, better temperature control, and no static electricity in the winter. To date, the system has performed beyond expectations, giving Mid-West Family broadcasting a level of temperature and humidity control combined with extremely low system noise previously unavailable to staff and maintenance personnel. This HVAC project is distinctive in its design because of the needs that were met with three independently installed systems.
Winner - 2005 Associated General Contractors Build Wisconsin Specialty Contractor Award
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This $2.5 million, 100,000 square foot six story atrium addition to Meriter Hospital was completed in 2004. H & H Industries installed steam, chilled water, VAVs (Variable Air Volume terminal units) serving individual patient rooms, perimeter heating, plumbing and medical gases. There is also a smoke control system for the atrium. All HVAC, plumbing, electric and fire protection were installed by H & H companies.
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H & H Industries installed four 17,000 cfm Air Handling Units as part of a remodel at the Waisman Center on the University of Wisconsin Madison Campus. Space limitations made it necessary to stack the units two high and two abreast. With the louver opening being the only place to bring in equipment, assembly began at the farthest point from the louver opening and the units were assembled piece by piece back to the louver. Prefabricated piping, assembled at H & H Industries' facilities was brought up interior stairways and installed in pieces. Extra bends in the piping make it possible to open all the doors on the air handling units. Flanges were used at multiple connections to facilitate the removal of any coils for service or replacement. The Air Handling Units heat and cool two floors of lab spaces. There are also large run around loop heat recovery units which capture heat from the fume exhaust system to increase energy efficiency in this research lab. The roof is outfitted with four 20,000 cfm exhaust fans to expel fumes from laboratory areas. The lab has variable air volume boxes on the supply duct and exhaust valves to control pressure in the spaces. The labs were also outfitted with ping pong ball pressure indicators so researches can confirm pressure relationships in the rooms at a glance. The floors below this work were occupied during construction, so most of the project was installed between 2AM and 10AM to allow meetings and research to continue while the construction work was ongoing. This site did not have any parking or staging space, so materials, equipment, and manpower had to be coordinated carefully. The project contract amount was $2 million and took twelve months to complete.
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The Ullsvik Center on the campus of the University of Wisconsin, Platteville received a major remodel and addition in 2007/2008. The building contains classrooms, a banquet hall, an art gallery, administrative offices and a full service kitchen. H&H was responsible for the $3.5 million HVAC upgrade and new installation. Six air handling units were installed to heat plus distribute the 510 tons of cooling produced by two chillers. The new mechanical room contains a steam pressure reducing station, a steam to water heat exchanger and a steam to water converter for domestic hot water. 146 VAV (variable air volume) boxes with hot water reheat and perimeter baseboard heat are distributed throughout the building.
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College of Business and Economics
Plumbing
H&H Industries plumbers installed all the piping and fixtures for this four story, new-construction educational building at the University of Wisconsin, Whitewater. The plan/spec project included bathrooms, classrooms sinks and storm drainage. Fixtures, toilets, urinals, laboratories, drinking fountains, and stainless steel classroom sinks kept the H&H crew busy throughout the spring, summer and fall of 2008.
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Plumbing
H&H Industries is honored to be the plumbing contractor for the new coolwater facility at the Wild Rose Fish Hatchery in Wild Rose, Wisconsin. This ongoing project will triple the size of the existing facility, which is currently the largest fish hatchery in the state. Six half acre ponds and eight one acre ponds receive the hatched fish from the main building. All the ponds contain "kettles" to fill or drain the ponds. The facility is well fed by two wells, one used for the facility and the other for domestic water (showers, bathrooms and sinks). A wide variety of piping is being used at the hatchery: schedule 80 PVC, schedule 40 PVC, SDR 35, C900 (heavy PVC), HD PE (high density polyethylene), buried oxygen, low pressure and high pressure air. A "head tank" building takes incoming water and processes it in oxygenation and degassing columns. There are five oxygenation/degassing columns and six transit time water flow meters located in the head tank building. A 3,000 bulk oxygen tank and distribution system supplies the tank house. Pump sizes range from 5 to 50 horsepower throughout the facility.
Other features of the plumbing work at Wild Rose Fish Hatchery:
- 112 stainless steel pneumatic fish feeders
- 3 positive displacement blowers
- A UV building containing two UV filters with a flow rate of 2,083 gallons per minute each
- Separate from the UV building are four more UV disinfection light chambers, with a flow rate of 1,200 gallons per minute, each
- A circular sludge storage tank, measuring 56' diameter x 15' tall (see slide show photo) with a rotatable jet vortex mixing system
- A 25' diamter, 14' deep clarifier
- Over 900 feet of in-floor trench drains
- Twenty four 5' round tanks
- Twenty 4' tanks
- Ten 30' jar racks, used for actual hatching
- Four rotating drum microscreens remove fish waste from water
- Eight concrete raceways, each 54' long
- Forty 20' fiberglass tanks
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Plumbing
H&H Industries Plumbing department performed a complete plumbing installation in this new-construction building on the UW Platteville campus. H&H work included hot and cold water, compressed air throughout the building and several sink and eye wash stations.
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