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How the 75F System Works with VAV Systems

By Sarah Baker on Apr 18, 2019 6:13:00 AM

There's a lot of waste involved with VAV systems commonly used in office and commercial buildings. Typically, VAV systems operate with roof-top units (RTUs) in cool-only mode. The supply air temperature is held constant at 55°F and, when a zone falls below its setpoint, the damper closes and reheat is enabled. When a zone is above its setpoint, the damper opens fully to allow as much 55°F air as possible into the zone to cool the space quickly. This cycle often involves first cooling and then heating the same air. Since the RTU operates in cool-only mode, the 55°F air must again be reheated before it is discharged back into the space to keep the zone's air temperature in balance.

See the waste?

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How Can Class B Buildings Get Smarter?

By Sarah Baker on Oct 17, 2018 7:52:14 AM

Could your office building be described as… average? Maybe it doesn’t have a fountain in the lobby, or a view of the ocean – but you have four solid walls, a non-leaking roof, and only a few drafty cubicles. Have you ever tried to make your building work with an HVAC hack? Maybe you even taped a piece of cardboard over the vent to manage the airflow. That would be pretty clever of you, MacGyver.

So, if your office building is around 10-20 years old, has some wear and tear, but is generally in good shape, you probably have a Class B building. This is good news. Investors tend to target these buildings since, with a few upgrades, they can easily become Class B+ and compete readily with Class A properties. One of those upgrades is making your Class B smart – and it’s probably easier than you think.

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Occupant Experience: Optimize Air Quality, Comfort & Zone Control

By Ben Wallace on Jul 30, 2018 11:00:27 PM

Your building could be working harder for your occupants. The Occupant Experience (OE) is a key measure of building performance, creating multiple benefits for building tenants and owners alike, especially when combined with Operational Efficiencies (OE) to yield what we call OE2 . Your commercial building can improve productivity, health & comfort with smart zone control of temperature, air quality and lighting to suit occupant preferences and workflows.


Is your building working for your occupants?

At 75F, we're on a mission to make buildings work for the people, especially the people buildings are designed to accommodate - their tenants. And, all building stakeholders, from building owners to facility managers to architects, can agree on the importance of creating the optimal occupant experience. However, comfort is recurring top issue and tenant complaint for commercial real estate properties. And, with 85% of commercial buildings lacking intelligent building systems, yet commercial real estate (CRE) properties are projected to have the highest growth in IoT connected devices deployments, the time is right to get smart with your building. It's more affordable and easier than ever to install a sophisticated IoT-based building automation systems to reduce energy and other operational expenses, while proactively optimizing workplace environments for employees and other occupants.

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VIDEO: VAV Box Controllers Deserve a Smarter Approach

By Ben Wallace on Jun 28, 2018 9:16:24 AM

The Variable Air Volume (VAV) with reheat HVAC systems and box controllers commonly found in commercial office buildings present a great opportunity for building owners and managers to save energy, improve operational efficiencies and better manage occupant comfort, with more sophisticated sensing and controls orchestration. These VAV with reheat systems tend to use the rooftop unit (RTU) to first cool supply air to a standard 55 degrees, then typically use the electric heat at the individual VAV box reheat elements throughout the building for heating supply air to desired temperatures for the zones. Though, the traditional VAV system has several issues with inefficiency and lack of sensing and controls management.

Check out this video to learn how you can improve building performance with operational efficiencies and a better occupant experience with the 75F Smart VAV with Reheat solution.

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Maximizing Efficiency with Variable Frequency Drives (VFDs) & 75F Intelligent Controls Approach

By Michael Moriarity on Dec 4, 2017 9:01:00 AM

 

An HVAC system that incorporates variable frequency drive (VFD) with scheduling control can deliver significant energy savings, especially when deployed at scale along with a building intelligence solution offering predictive and proactive controls for incremental adjustments for variable loads.

In many states and cities, VFDs are required by building code on rooftop units (RTU) and air handling units (AHU) of nine tons or greater. HVAC systems are designed to cater to the peak design load of a building. However, most of the days the building experiences partial loads, either because of milder weather or lower than maximum occupancy load. VFDs offer higher efficiency during partial HVAC load scenarios. VFDs also help reduce inrush current at startup, plus lowered mechanical stress.

In AHU's with variable loading capacities, the 75F CCU will continuously adjust both the chilled water supply as well as fan speed to accommodate the building load. Such equipment can take advantage of the small granular control in capacity between 0-100% that the 75F system can offer.  

However, 75F is often deployed with simpler HVAC equipment with only 1 or 2-stages of cooling or heating. In such a case, we follow an approach that modulates the fan speed based on 3 primary positions for 2-stage RTUs.

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Spotlight: Matt Blount, R&D and Product Engineer

By Kelly Huang on Aug 24, 2017 8:16:00 AM

Matt Blount, 75F Research & Development and Product Engineer, graduated from University of Minnesota Duluth (UMD) with a degree in BioChem. While his role today is far from what he expected when he attended school, it all worked out for the better. Matt found a career that makes sense to him, and 75F appealed to him more than working in a lab. 

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