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Nailor News is your source for content on relevant topics concerning Nailor Industries, Inc. and the HVAC industry. New product releases, case studies, product & project spotlights, employee interviews, trade publication articles, and general announcements are some of the content types you can expect to find in the Nailor Airwaves.

Ventilation Strategies: Chilled Water Fan Powered Terminal Units

September 27, 2021
By: Matthew Crump, PE

The most advanced system for delivering, controlling, and optimizing ventilation air utilizes Chilled Water Fan Powered Terminal Units. With this system, the DOAS unit handles the conditioning of the ventilation air and the latent load within the building. The system eliminates the need for the recirculating air system to handle latent loads and distributes the sensible cooling into the space.

Achieving this system requires series fan-powered terminal units that are equipped with a sensible cooling coil, eliminating the need for the building air...

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Ventilation Strategies: Chilled Beams vs. Chilled Water Fan Powered Terminal Units

September 1, 2021
By: Matthew Crump, PE

A large portion of the energy exerted by an HVAC system comes from conditioning the outside air required by the mechanical code, which typically reference the ASHRAE 62.1 standard. Increasingly, this is performed separately from the building HVAC system by a Dedicated Outside Air System (DOAS). When designing a DOAS system, one decision is how to distribute the air to the space. In my previous Ventilation Strategies article, I highlight a few methods for...

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Ventilation Strategies: Controlling Fresh Air

August 12, 2021
By: Matthew Crump, PE

The first goal when designing an HVAC system is occupant comfort. Comfort includes considering thermal, acoustic (sound), and health conditions delivered by the system. HVAC helps create a healthy environment that is achieved through the delivery of fresh air to the space.

ASHRAE Standard

Recognized as a need in the 1960s, ASHRAE documented this with the first publication of standard 62 in 1973. This standard, now known as 62.1, provides the ventilation requirements and guidelines to achieve a well-ventilated building...

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VAV Systems: How Air Flows Through the Equipment

June 24, 2021
By: Matthew Crump, PE

The purpose of using a Variable Air Volume (VAV) system is to add controllability to a diversity of occupancies using only one air handling unit. A constant volume system is like what you have in your home, either off or on. If you apply a constant volume system to a space with multiple heating/cooling load profiles, someone will not be comfortable at different times of operation. The fundamental parts of a VAV system include:

  • Air handling unit
  • Primary ductwork
  • Terminal unit
  • The ductwork/air distribution...
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HVAC Ins & Outs with Dan Int-Hout - Area Factors and Free Area

June 9, 2021
By Dan Int-Hout

Every so often, we get a request for the Ak, or area factors, or for the “Free Area” for our air outlets and inlets. For many years, manufacturers published “area factors” for balancing purposes. These Ak factors are determined by measurement of indicated air velocities and measured air quantities and can be used to balance HVAC systems. For a number of reasons, these values, however, are no longer being presented. When we get these requests, the first question we must ask is “What are you going to do with the value”?

The A...

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