Looking for ERV recommendations for a new two level ICF residence located at 6800 ft elevation with 6001 HDD base 65 and 0 CDD base 50. Radiant floor heating only. Conditioned living space is 20,000 cf per level plus small amount of conditioned attic due to foaming the roof deck. Lower level is walkout on one side and buried on three. Upper level has garage attached on one side only.

Using total volume * 0.35 ach / 60 min/hour = ~120 cfm flow per level. There are two baths and laundry per level and two bedrooms and great area on each level. Plan on drawing from baths and laundry and supply bedrooms and great area.

Looking for easy to install and maintain system with auto dehumidification boost capability for the bathrooms. Will install in storage room on lower level and conditioned attic space on upper. Prefer side pipes due to limited height in attic space. House as gas fireplaces on each level that vent to the exterior, though currently drawing from the house. Also, large range hood over island stove top with no makeup air. Considering making the house slightly positive pressure. 

What do you find that works in the dry southwest at altitude? Remote area with limited HVAC technicians to rely on! Any design considerations we should keep in mind?

Thank you in advance for sharing your knowledge.

Tags: ERV

Views: 417

Reply to This

Replies to This Discussion

I've used the CAR II regulators before. They work, but obviously it's more mechanical moving parts that might fail overtime. I've had good success using simple adjustable diffusers. Diffusers closest to the ERV will be more "closed" and ones farther from the ERV will be more open.

If you give old school HVAC contractors a good ERV strategy outlining duct sizes and locations, they shouldn't have a problem. ERV/HRV systems can be as simple or as complicated as you want to make them. In your strategy (60-120 cfm per floor) I would use 6" trunks off the ERV and 4" branches to 2-3 locations.

Example layout:

ERV-1 operating at 60 cfm continuous and 120 cfm in boost.

Supply: 6" trunk off ERV, 4" branch to bed1, 4" branch to bed2, 4" branch to great room.

Exhaust 6" trunk off ERV, 4" branch to bath1, 4" branch to bath2. Boost timers wired from bathrooms to ERV for increased flow rate.

Two 6" insulated trunks routed to the exterior 6" hoods -- hoods located minimum of 6 ft a part and preferably 4 ft above the exterior ground. 

4" adjustable round diffusers (SEIHO) installed at the termination of each branch duct in ceiling. Adjustable to achieve the desired continuous flow rate in that location.

Hard to make a full strategy without seeing the actual floor plans. But this is a pretty standard set up for an ERV in an ICF house. Balanced approach.

RSS

Forum

Capillary break retrofit

Started by Paul Raymer in Best Practices. Last reply by Paul Raymer on Thursday. 3 Replies

Help with OpenStudio/EnergyPlus

Started by Kerry Haglund in General Forum. Last reply by Kerry Haglund on Thursday. 1 Reply

Insulating Chilled/Cold Water Lines

Started by Sean Wiens in HVAC. Last reply by Sean Wiens Jan 20. 10 Replies

What's the Most Profitable HVAC Job for Your Company?

Started by Wayne Melancon in HVAC. Last reply by bebelyn accessdoors Jan 16. 5 Replies

Looking for a Rater in Sacramento Area

Started by Brian A McFadden in BPI. Last reply by Building Performance Institute Jan 14. 1 Reply

Hydronic System Critique

Started by Sean Wiens in HVAC. Last reply by Sean Wiens Jan 14. 8 Replies

Condensation Quick Fix

Started by Dan Antonioli in General Forum. Last reply by Sean Wiens Jan 13. 12 Replies

Latest Activity

Mark Fetsko replied to rebecca bridges's discussion Your Top Energy Efficiency Tips for the Heating Season
"Plexi-Glass Window Inserts. For interior or exterior sides of drafty or older single pane…"
yesterday
Profile IconValerie Urso, Jason Epley, Emily Dale and 1 more joined Home Energy Pros Forum
Friday
Leslie Jackson commented on Macie Melendez's blog post Re-introducing Myself as the Building Performance Journal’s Managing Editor
"Great to have you back, Macie, and to work beside you this time! Looking forward to the coming…"
Friday
Leslie Jackson liked Macie Melendez's blog post Re-introducing Myself as the Building Performance Journal’s Managing Editor
Friday
Paul Raymer replied to Paul Raymer's discussion Capillary break retrofit
"Thanks for the input."
Thursday
Kerry Haglund replied to Kerry Haglund's discussion Help with OpenStudio/EnergyPlus
"I think I may have found the issue with the original residential prototype IDF files. See the last…"
Thursday
Jim Gunshinan commented on Macie Melendez's blog post Re-introducing Myself as the Building Performance Journal’s Managing Editor
"We are very glad to have you back on our team Macie. I think anyone reading your post will…"
Thursday
Jim Gunshinan liked Macie Melendez's blog post Re-introducing Myself as the Building Performance Journal’s Managing Editor
Thursday
Jim Gunshinan liked Building Performance Journal's blog post Dust-Control Strategies for Energy Upgrades
Thursday
Robin Henry replied to Robin Henry's discussion Potentially Looking To Buy Insulation Machine in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Thanks for the offers and phone call fellahs. I ended up purchasing a Force2 this past weekend so…"
Thursday
Walter Ahlgrim replied to Paul Raymer's discussion Capillary break retrofit
"I think you are confusing terminology. Capillary break retrofit is a impossibility. A sheet…"
Thursday
Kerry Haglund posted a discussion

Help with OpenStudio/EnergyPlus

A bit new to the Open/Studio/EnergyPlus world and I am seeking some help. I have downloaded the…See More
Thursday

© 2020   Created by Building Performance Association   Powered by

Badges  |  Report an Issue  |  Terms of Service