Manual J ... The Easy Way When do I need it? How much detail? How does it relate to my Scope Of Work? Can I contract it out? Is it the gospel truth? The whole truth? Are there shortcuts? When can I take them? Easy, Medium, Hard, Which one’s for me? G r e e n E a r t h E q u i t i e s . C o m
(This is not the Easy Way... But it’s good to Saving understand) The Planet © 2010
One House At A Time
Before we begin... What’s happening here? (It was mentioned last week as a Change Order)
Rogelio sends me stuff like this from his iPhone so 3000 miles doesn’t matter. G r e e n E a r t h E q u i t i e s . C o m
© 2010
Saving The Planet One House At A Time
Couldn’t go overhead as the new gas stove is in an island = Had to cut the concrete. Owner Requested and Paid Change Order Wall Removal and Stove Relocation
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Questions From Last Week
1 zone or 2? Buyer wants changes?
How bad is “Oversizing?”
How can we reduce the heat load? Concealed Unit or Wall Mount?
When to keep old equipment? Western Exposure?
Change Order?
Need an ERV-HRV?
Ducts Inside Envelope or in the Attic? Does a Room Add makes sense?
Fireplace?
How much can a 2 ton do?
How tight can we get this one?
G r e e n E a r t h E q u i t i e s . C o m
Manual J? Manual D? Mini Split Heat Pump? What Size? Even with 2 Room Adds? How about a Garage Conversion? Still 2 ton? Rigid Insulation?
Low E 140? © 2010
Saving The Planet One House At A Time
Garage only = 361
Total = 1700
Shows total square footage. Newest (owner’s) plan is to convert the garage
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
N G r e e n E a r t h E q u i t i e s . C o m
Note: No Windows on East, Few on West Saving
Š 2010
The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Any Surprises?
Walls
Ducts Infiltration
Glazing Doors
Floors
Ceiling Walls
Internal Gains
Glazing Doors Ceilings
Ducts Infiltration
G r e e n E a r t h E q u i t i e s . C o m
Internal gains are growing annually .... A big area for homeowner education
Š 2010
Saving The Planet One House At A Time
HTM = Heat Transfer Multiplier Every Building Component has one
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Room by Room & Component by Component
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Your HVAC contractor should provide this type of report for you ... Just as your realtor should provide you with the CMA. But for quick reference, let’s look at an easier way to do Manual J And see how close to the same answer we get ...
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Fill in Yellow ... The Rest Auto Calculates
Blank Template
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Instructions for using the Load Calc SpreadSheet They are in the cells immediately to the right of the main sheet
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Now go live to the Load Calc SpreadSheet. Let’s see how easy it is to tell if a 2 ton mini split will do the job! (2 ton is the smallest they make.) G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
G r e e n E a r t h E q u i t i e s . C o m
Š 2010
Saving The Planet One House At A Time
Let’s see which questions were answered by doing the Manual J Calculation Can you identify where Manual J addressed each question? G r e e n E a r t h E q u i t i e s . C o m
© 2010
Saving The Planet One House At A Time
1 zone or 2? Buyer wants changes?
Always? 2
Always In Writing, Paid For Up Front
How can we reduce the heat load? Concealed Unit or Wall Mount?
When to keep old equipment?
Address each component & maximize it’s efficiency Wall mount would be even more efficient. No duct loss
Not as bad as once thought... Especially with inverter technology
How bad is “Oversizing?”
5-10 yrs old But dont even consider the ducts.
Western Exposure?
Low E 140? Especially on West and East Expsure
Twice the load as North
Need an ERV-HRV? Build so that you always need Ventilation ON Purpose
Fireplace? It’s Gotta Go!
Manual J? Manual D? J for equipment D for Ducts
Mini Split Heat Pump? What Size? Even with 2 Room Adds? How about a Garage Conversion? Still 2 ton?
Ducts Inside Rigid Insulation? Could reduce Envelope or in load even more Good load with ducts inside the Attic? reduction especially on east and west. We think so Does a Also reduce leaks So did our buyer How tight Room Add Saving makes sense? How much can This one, 1700 sf can we get We’re shooting for The Planet .5 cfm50 per square still has 20% extra this one? One House a 2 ton do? foot of floor capacity G r e e n E a r t h E q u i t i e s . C o m
© 2010
At A Time
Manual J ... The Easy Way When do I need it? How much detail? How does it relate to my Scope Of Work? Can I contract it out? Is it the gospel truth? The whole truth? Are there shortcuts? When can I take them? Easy, Medium, Hard, Which one’s for me?
Always, Unless you are building so tight that the smallest unit is still too big. Still a good idea After answering the big question, the detail is needed for room to room air delivery Dont guess, Improve the envelope or the equipment Yes, HVAC Sub Sort of. There are other ways and other factors. Fudge factors and safety factors are built in. Yes but it’s good to know the old school way It’s America You Choose
G r e e n E a r t h E q u i t i e s . C o m
© 2010
Saving The Planet One House At A Time