12/06/2009

Is a Variable Refrigerant Flow System Right for Your Building?

VRF systems are one of several modern variable-speed and variable-output systems that provide lower energy costs and quiet, comfortable HVAC operation. View larger
VRF systems are one of several modern variable-speed and variable-output systems that provide lower energy costs and quiet, comfortable HVAC operation

VRF systems are one of several modern variable-speed and variable-output systems that provide lower energy costs and quiet, comfortable HVAC operation. View larger

Variable refrigerant flow systems (VRF) are a more sophisticated version of the minisplit HVAC system used throughout the world. They distribute the refrigerant instead of piping hot water and chilled water to each fan coil unit (FCU) or air handling unit (AHU). By supplying different amounts of refrigerant to evaporators, the systems provide simultaneous heating and cooling.

VRF systems vary the amount of refrigerant flowing to a series of evaporation coils in a “common” refrigeration piping system. The evaporation components – HVAC in common terms – can be different sizes and serve many different spaces within a building. Some VRF evaporators can be in the cooling mode and others in the heating mode at the same time.

While VRF systems are relatively new to the U.S., they have been used in Japan and Europe since the 1980s. In Japan, 50 percent of mid-size buildings up to 70,000 square feet and 33 percent of buildings larger than 70,000 square feet use VRF systems.

The initial costs for VRF systems are an additional 5 to 20 percent over those for chilled water systems; however, they are roughly 30 percent more efficient than comparable HVAC systems. Although the equipment cost is higher, the installation cost should be a bit lower because all the evaporators use a two-pipe distribution system.

As you might assume, VRF systems require more advanced controls than a simple thermostat. Nearly all of the new HVAC systems require more advanced controls since they communicate continuously with the components of the HVAC system without human intervention. While these systems may require some programming by the mechanical contractor, they are now nearly “plug and play” from the end-user’s perspective. Modern HVAC systems and controls are installed and maintained by factory-trained service techs much the same as the modern automobile. Gone are the days of the shade tree mechanic. Modern automation controls are the reason the systems are more efficient. They also make it easier to determine if a component of the system needs repair.

The bottom line is VRF systems are one of several modern variable-speed and variable-output systems that provide lower energy costs and quiet, comfortable HVAC operation. There is no need to invest in the old constant-volume, on/off HVAC systems that cost more to heat and cool your buildings. The only decision is how much to invest on the front end to ensure lower energy cost for the long run

  Richard G. Lubinski is president of Think Energy Management LLC, an energy consulting firm. His national professional certifications include Certified Energy Manager, Certified Energy Auditor, Certified Demand Side Management Professional, Certified Sustainable Development Professional, Certified Energy Management Systems Contractor, Certified Business Energy Professional and Certified U.S. Green Lights Survey Ally.


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.

Add highly responsive multi-zone comfort to any building project, in any climate. Our CITY MULTI H2i R2- and Y-Series VRF systems give you flexibility to fit the needs of any building. Enjoy 100% heating capacity at 0°F outdoor ambient, and 85% heating capacity at -13°F outdoor ambient.  For more information, log on to www.mitsubishipro.com

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