I am curious on how people who use Manual J for load calculations addresses the quirky issues that arise in high end custom home issues such as how to calculate the load for: a screening room that seats 20, a personal gym, a dinning room that seats 35-40. How does one correctly size a unit when the baseline load for the house will be very different than the peak loads in certain rooms? 

Tags: JSD, Manual, right, size

Views: 132

Reply to This

Replies to This Discussion

Hi Dav, since all of my work is custom, much of it high end, these types of scenarios come up from time to time. Extra people and exercising (gym) generates extra cooling loads, not heating loads. Zoning those rooms doesn't help because a) the capacity required to address those loads may be significantly larger than the baseline load, and b) in a confined space like a home theater, it's easy to end up with a cooling load in the winter. So the only viable option is to install a separate system specifically to address the "impulse" loads.

I typically use mini-splits for this. The mini would only be used when the additional loads are present. Depending on the space, I use ductless or ducted minis. The whole house HVAC would handle the loads in those spaces when they're unoccupied or lightly used.

As for calculating the load, you'll find the following site helpful: http://bit.ly/2Ah4SHH

Feel free to contact me privately if you need support on a specific project.

Thank you David. I will check out the link. BTW, I tried to email you; did you get it?

what time of year?  If mid summer late afternoon -Yes add a unit just for the party room.   I just did a very low energy house that has a bridge party each monday at 3 pm with 16 extra body's - extra drinks - extra food - ended up with extra 1.5 tons of cooling

RSS

Latest Activity

Summer Reyes posted a blog post
6 hours ago
Oliver Periman is now a member of Home Energy Pros Forum
13 hours ago
Bob Krell joined Tom White's group
Thumbnail

Trainers and Mentors

Share your experience with different training and mentoring methods. Learn about new training…See More
yesterday
Bob Krell replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"Most of the moisture issues there can be attributed to failure to get the roof system completely…"
yesterday
Bob Krell replied to Bob Krell's discussion What Do You Do When You Find Suspected Mold? in the group Healthy Indoors (IAQ)
"You are correct about it being multi-family.  It is, in fact, an assisted-living facility, so…"
yesterday
Quinn Korzeniecki added a discussion to the group Building Performance Institute (BPI)
Thumbnail

Weatherization Pros: Only 9 Days Left to Apply for Free BPI Certification Exams!

Are you a weatherization professional? Don't miss your chance to get the costs of your new 2018 BPI…See More
yesterday
Quinn Korzeniecki posted a discussion

Weatherization Pros: Get BPI Certification Exam Costs Covered!

Are you a weatherization professional? Don't miss your chance to get the costs of your new 2018 BPI…See More
yesterday
Diane Chojnowski replied to David Butler's discussion Beginners Guide: Managing Subscriptions on Home Energy Pros
"Great guide David! Thanks! We send two weekly emails to keep members in the loop about new blogs,…"
yesterday

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service