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Champaign, IL, United States

Vastyan J.,Common Ground Publishing, LLC
HPAC Heating, Piping, AirConditioning Engineering | Year: 2012

Some important facets of hydronic-system design and function that design engineers and building owners should be aware of to create a total system approach are discussed. These facets include first cost, life-cycle cost, annual efficiency, and value engineering. Equipment configuration includes using a modulating condensing boiler to handle the low-temperature startup and circulation phase, then shifting heating and circulation to less expensive, non-condensing systems for routine heating. When life-cycle calculations are completed, a mixed installation of condensing and near-condensing boilers is the most cost- effective solution. Every packaged boiler design must be tested to government standards for its nominal efficiency to be determined. Another important factor is proportional-integral-derivative (PID) controls that sample changes over time. A standard boiler without outdoor reset control will modulate down while operating at high temperatures. Source


Vastyan J.,Common Ground Publishing, LLC
HPAC Heating, Piping, AirConditioning Engineering | Year: 2011

The features of a thermal-storage system coupled with radiant cooling for commercial facilities that were exhibited at ISH 2011 in Frankfurt, Germany, are discussed. Cold night-time air is blown through a cooling tower. The resulting cooled water is moved through a plate- and-frame heat exchanger and circulated through cross-linked-polyethylene (PEX) tubing attached to the underside of floor slabs. Chilled ceilings have a fairly low cooling capacity of 20 to 30 Btuh per square foot. Passive chilled-beam systems, on the other hand, have a cooling capacity approaching 150 Btuh per square foot, while active chilled-beam systems have a cooling capacity approaching 400 Btuh per square foot. An alternative to conventional variable-air-volume (VAV) systems, chilled beams circulate chilled water through tubing embedded in a metal ceiling fixture to wick away heat. The business end of a chilled beam is made of copper tubing bonded to aluminum fins. The beam is housed in a sheet- metal enclosure typically placed at ceiling level. Source


Vastyan J.,Common Ground Publishing, LLC
HPAC Heating, Piping, AirConditioning Engineering | Year: 2011

Advanced hydronic equipment provides efficiency and system flexibility in the construction of larger buildings. The newest generation of hydronic equipment, such as condensing technology that extracts heat from condensate, recovers heat for hydronic use, pushing combustion efficiency into the 95- to 99-percent range. Additionally, hydronic equipment can be fitted with new and sophisticated controls and integrated with a building-automation system (BAS). Additionally, more-sophisticated controls can sample modifications over time and learn a system's responses to changes in conditions. Advanced boiler electronics likely will become self-diagnostic and understand what steps should be taken to fix the problem. Variable-speed pumps, including close-coupled, vertical Inline variable-frequency drives (VFDs), and larger base-mounted, end-suction pump lines, offer a broader range of performance for jobs that demand varying fluid pressures and volumes. Source


Vastyan J.,Common Ground Publishing, LLC
Engineered Systems | Year: 2011

Heidelberg United Church of Christ in York needed a mechanical fix in their heating equipment. Dave Yates, president of F.W. Behler, Inc. was given the contract to handle the situation. Yates' plan included converting the sanctuary's steam radiators to hot water, requiring several new, compact modulating condensing hot-water boilers. Remaining portions of the church would be served by a new, properly sized steam system. Yates also planned to provide A/C to the entire, non-ducted building with ductless Fujitsu mini-split systems. A 12,000 Btuh evaporator unit was installed; one of three that are connected to a 2.5-ton, triple-zone condensing unit outside. The other two evaporators, at 9,000 Btuh each, were installed in the nearby restrooms. Large capacity, three-ton units were installed to throw air over large distances; a requirement for the 5,000 sq ft, 65-ft high sanctuary. Source


Vastyan J.,Common Ground Publishing, LLC
HPAC Heating, Piping, AirConditioning Engineering | Year: 2010

Some of the significant tips that are essential for the application of the variable-speed pumping technology are discussed. The speed of a variable-speed pump is adjusted automatically on the basis of heating- or cooling-load demand. Pipe-sizing guidelines for the technology are based on minimum and maximum flow velocity and maximum head loss. Recommended design parameters are velocities of 2 fps to 8 fps at a head loss of no more than 4 ft per 100 ft. Riley, president of William J. Riley Plumbing & Heating Company Inc., suggests that determining the piping arrangement is another factor that needs to be considered for the application of the technology. He also informs that estimating the head loss of the piping system is the next step that needs to be followed where he measures the longest zone from the discharge side of the pump all of the way around the system till the chiller, and back to the suction side of the pump. Source

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