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HVAC System Modeling

High Performance HVAC Design

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::Technical Services - HVAC

Advantek’s Heating, Ventilating and Air Conditioning (HVAC) expertise is unmatched. We focus on developing and properly applying state of the art technology.

Performance data from previous projects demonstrates that a higher level of attention during HVAC design and construction can result in a 9 to 15% savings in energy usage, while at the same time improving indoor air quality, occupant comfort & productivity, and reducing construction change orders and maintenance costs.

The subtleties of indoor air quality and dehumidification are routinely misunderstood or missed altogether. Too often, this results in system performance being less than expected. Advantek provides HVAC engineering oversight and system functional performance testing to ensure that actual system performance meets the project requirements.

  • HVAC system performance, economic, and maintainability evaluations
  • Controls diagnosis, optimization and commissioning
  • Expert application of energy efficient dehumidification technologies
  • High-performance HVAC plants, air systems and controls
  • Ground-source/geothermal heat exchange
  • Energy efficient laboratory HVAC/fume systems using 100% fresh air
  • Bio-defense air filtration and cleaning
  • Mold remediation and prevention
  • Cleanroom designs meeting ISO-14644 and/or FS209 standards
  • Hourly HVAC computer simulations using DOE-2, HAP or TraneSA
  • Cold-air (less than 50 degrees F) distribution systems
  • Retro-commissioning of HVAC equipment and controls

Example Project

HVAC System Modeling
Complaints about poor air quality and high humidity levels at two Hillsborough County high schools prompted an analysis of the HVAC system design. The system controls incorporate a discharge air temperature reset, which  increases air temperature at low cooling loads in order to decrease energy use. Furthermore, the reheat system had been turned off to comply with the Energy Code. Unfortunately, this resulted in decreased system dehumidification  capacity at low sensible loads -- just when humidity control is most critical. An hourly computer building simulation model was developed using DOE2.1E and Visual Basic to simulate control sequences and arrive at low cost modifications that will reduce humidity. The modifications will solve the air quality problem while reducing energy costs, as compared with reactivating the hot water reheat system.

 

High Performance HVAC Design

A state of the art system providing space conditioning, fume hood exhaust, general exhaust, and make-up air was developed for an energy efficient showcase laboratory at the University of Florida. This system is a 100% outside air, once-through system that provides six air changes per hour without the use of expensive reheat for humidity control. Advanced features include the use of both  molecular sieve and silica gel enthalpy wheels, variable speed fans controlled by space pressure, 4-stages of DX cooling using SEER 15 equipment, heat pipe coils, and automatic fume hood sash positioners that close the lab fume hoods when not in use.


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