November Lunch Meeting: 100% DOAS for VRF Tech with Dan Hahne

Bio:

Dan Hahne began his HVAC industry career in 1985 when he accepted his first position working as an estimator for the HVAC representative organization, Norman S. Wright Co. SW, Phoenix. After years of estimating, Dan’s profession transitioned into contractor sales before he accepted a position at a newly established representative company in 2000, Air Specialty Products (ASP), currently known as ThermAir Systems. At ASP he learned how to support and sell to design development projects for large commercial and institutional buildings. He currently holds the position as Director of High Performance Building Solutions at Varitec Solutions.

Topic:

100% Outside Air Systems: Variable Refrigerant Technology

To design high-efficiency HVAC systems, it is necessary to control a building’s space air conditions local at each zone. As room loads fluctuate, depending on the type of zone conditioned and its location, a system should respond (modulate) in a manner that consumes only as much energy required to meet each respective zone load. Variable refrigerant systems, commonly known at VRF, are an all-electric mechanical system that accomplishes this objective. By supplying only the amount of refrigerant required to satisfy space load, condenser work is minimized and system efficiency enhanced. However, in our Sonoran Desert climate zone, conventional VRF layouts are often not designed to deliver the type of efficiency available to the technology. To enhance performance, decoupling the outside air from a VRF layout delivers improved system efficiency while creating superior building IAQ. And, since these are all electric systems, they support the AIA’s 2030 Commitment initiatives.

Topics to be covered are:

• Indoor Air Quality: Institutional Initiatives (EPA, CDC, ASHRAE)

• Variable Refrigerant Technology:

  • Condenser and Air Handler Operation and Performance

• Variable Refrigerant Design Considerations

• Optimizing Variable Refrigerant Systems: 100% OSA Concept

  • Three System Design Concepts: Performance and Review

• Architectural Considerations

(1) AIA HSW/LU credit will be available for attending registered architects or (1) PDH for professional engineers.

Recommended Audience: ASHRAE members, mechanical engineers and designers, architects, building owners