Posts From May, 2016

Blog Post List

Variable Refrigerant Flow (VRF): Growing Trend Explained 

May, 31, 2016 at 19:00 Categories: Building Commissioning Energy Energy Efficiency engineering

VRF

By: Thomas Conn, Field Engineer, NYC Office

Introduction
Variable Refrigerant Flow, commonly referred to as VRF, is a method of heating and cooling spaces that is quickly gaining acceptance and popularity in the United States. Although VRF, which uses refrigerant in either a subcooled liquid or superheated vapor state to heat and cool spaces, was invented in Japan in 1982, it was only introduced to the United States in the 2000s. This “new” technology spread quickly across several large markets and is now a viable option for heating and cooling in almost any application.

What is VRF?
The concept of VRF is a rather simple, and literal, expansion of the tried and true refrigeration cycle. It should be explained by comparing it to a traditional chiller system first: instead of the evaporator being a heat exchanger where the refrigerant cools down water to be pumped through terminal units to cool a space, the refrigerant flows through coils inside an “Indoor Unit” which blows air taken from the conditioned space over the coils (which are acting as the evaporator), cooling the air and heating the refrigerant. The refrigerant travels back up to the “Outdoor Unit” to be pressurized by the compressor and reject heat to the atmosphere in the outdoor unit’s coils (this takes the place of a condenser in a traditional system)...

 

Employee Spotlight: Ryan Younis 

Employee of the Month
May, 04, 2016 at 56:00 Categories: Building Commissioning Energy Efficiency

Employee of the Month: Ryan Younis, Field Engineer.

Aside from being an all-around amazing engineer, Ryan identified over 30 deficiencies that could have created major issues with system operation if not brought to anyone’s attention. Here's a quick Q/A with him:
• If you could vacation anywhere on the planet, where would you go? I have always wanted to go explore the Philippines.
• What is something about you that would surprise people? I just adopted a puppy – a dachshund beagle mix named Ella!
• Describe your perfect Saturday? Boozy brunch and a day in the Prospect Park with the dog.
• What is something you would like to learn to do? I love home improvement, so I would love to learn more about do-it-yourself home improvement.  
• What do you like best about working at HEA? I like being involved in the energy audits and reducing the energy consumption of major NYC buildings.