Which one is better? Hi-Velocity vs traditional Forced Air sol'ns for the home

I am guessing this topic has come up before however I am hoping some HVAC folks out there would help me understand the advantages and dis-advantages of traditional forced air distribution systems as compared to Hi Velocity forced air systems. Specifically with respect to IAQ (indoor air quality), efficiency, comfort and ease of installation. Also does one type of system work better at a lower design heat temperature? Thank you for your time and willingness to share your expertise!

Tags: Air, Forced, Furnace, HVAC, Hi, IAQ, Velocity

Views: 395

Reply to This

Replies to This Discussion

Great question!

I've never had the opportunity to install these systems, but I am a little familiar with them. 

Pros:

Could save money on installation if there are access issues

Zoning capabilities are good with zoning controls and variable speed fans

Cons

Higher velocity is going to equal a higher static pressure drop, which means that your blower motor is going to be working overtime. Unfortunately, I couldn't find the engineering data behind their duct sizing - they do list maximum duct lengths, but not pressure drop data. I suspect they use larger motors on their blowers than a standard system. This penalty will double if you follow their indoor air quality recommendations and run the fan continuously to filter air.

I also couldn't find the "manual T" performance characteristics of their supply registers. But, if the air is moving fast, I suspect you'll be able to hear it coming out of the register. You'll want to verify the throw distances and noise criterion of their supply registers.

For me, I would think these systems work best when you can't use a standard system because of space restrictions. You could do a cost savings analysis and compare ease of installation versus operations cost (pretty sure these are going to use extra electricity to operate). I'd check with manufacturer to get blower information and register information. Also, try comparing the fan motor horsepower to an equivalent standard unit.

Other units I'd recommend: Carrier makes the infinity system that can be zoned without a bypass. Lifebreath makes nice units that have built in HRVs, FirstCo makes nice hydronic air handlers. You can always install a little fantech HRV with a MERV 6 filter, or use an AprilAire or similar media filter instead of a paper filter on a standard system.

For the ultimate in air quality, comfort, and control, modulating communicating equipment.  Period.  

Carrier Infinity or American Standard/Trane.  I'm not familiar with the other's Brady mentions, but if you want zone control, communicating equipment understands air flow.  This is particularly important when zoning, as he is suggesting.  

I have a Unico in my house, but I was space restricted.  I'm happy with it, but it doesn't hold a candle to Communicating equipment. 

I'm happy with my Fantec ERV.  

Unico systems operate the evaporator close to freezing, lower CFM. If you can keep the air handler/ductwork in conditioned space, you may be able to offset much of the efficiency loss caused by the low CFM system.

RSS

Welcome to Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

Featured Blogs

Seeking Innovation in Roofing Systems

Posted by Sarah OConnell on May 12, 2017 at 9:47am 0 Comments

Oak Ridge National Lab has partnered with GAF to host a technology challenge on roofing systems.  The challenge is part of the online crowdsourcing site, JUMP, and aims to identify innovation solutions for ensuring energy efficient and durable…

Continue

Top tips for maintaining an evaporative cooler

Posted by Kobus Niemand on May 4, 2017 at 3:30am 0 Comments

Evaporative coolers, also known as swamp coolers have become a top choice for anyone looking for an alternative cooling solution from their home or office. In the past, evap cooler technology was limited for use in large operations that have easy…

Continue

Congratulations to the 2017 Race to Zero Winners!

Posted by Home Energy Magazine on May 9, 2017 at 6:56am 0 Comments

The Ryerson University and University of Toronto team topped the …

Continue

Connecting the Dots: Real Estate and Home Performance

Posted by Home Energy Magazine on May 9, 2017 at 6:50am 5 Comments

A new type of conversation between REALTORS® and their clients is changing the real estate industry before our eyes. As homebuyers browse Zillow listings and spend…

Continue

Latest Activity

Andrew Etue added a discussion to the group Job Board
Thumbnail

Washington State Seeks Weatherization Field Monitor

Washington State Department of Commerce in Olympia, Washington is recruiting for a Weatherization…See More
13 hours ago
Andrew Etue joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
13 hours ago
Horace Douglas Hunt, Jr. posted a status
"Still looking to purchase a used RetroTec blower door - complete system. Anyone have something available?"
21 hours ago
Sean Lintow Sr replied to Luis Hernandez's discussion Solar panel leasing
"Sorry but no, not that big of a thing up here Biggest issue I see for most is everyone grid ties…"
yesterday

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service