Dan Wise
  • Boalsburg, PA
  • United States
Share on Facebook Share on Facebook Share Twitter
  • Featured Blogs
  • Discussions (2)
  • Events
  • Groups
  • Photos
  • Photo Albums
  • Videos

Dan Wise's Discussions

Convert BTU/hr in a Manual J to actual fuel usages
13 Replies

I cannot find any conversion table that translates the BTU/hr heat loss in a Manual J report to the amount of fuel required to heat the building to the design temperature.  In this case I'm using…Continue

Started this discussion. Last reply by eric anderson Jun 19.

 

Dan Wise's Page

Latest Activity

Diane Chojnowski left a comment for Dan Wise
"Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you! Don't…"
Jun 29
eric anderson replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Morgan, From the perspective of the energy auditor, I don’t agree with that statement. “Actual fuel and electrical usage" is anecdotal at best” Unless you change something, the best predictor of future energy usage is past…"
Jun 19
Morgan M Audetat replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
""Actual fuel and electrical usage" is anecdotal at best. Bin is the thing and ASHRAE/Manual 'J' have the average weather data relevant to the building site.  The operate can cheat the numbers to add what ever he likes, but…"
Jun 18
eric anderson replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Bud, I think these 2 articles will help illustrate the difficulties of modeling energy usage. http://www.nrel.gov/docs/fy11osti/51603.pdf http://www.sustainablybuilt.com/SB_Modeling_Software_Presentation.pdf The first speaks to the common …"
Jun 18
Bud Poll replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Hi Morgan, I have admitted my lack of knowledge concerning Manual J and even worse, I approach heat loss from an energy auditor perspective, somewhat different from the HVAC approach. Example, we have no need to break down heat loss to room by room…"
Jun 17
Morgan M Audetat replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"I use Wrightsoft to design HVAC systems, which is base on ACCA Manual 'J' heat load data.  My experience over the last 40 years has not been that over-sizing results from people depending on any Manual 'J' calculation…"
Jun 17
Bud Poll replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Hi again, Just to be clear, I wasn't questioning the person who did the MJ work, but I was questioning MJ itself as I do not know if or where those factors mentioned are included. There's another distinction between loss at design temp and…"
Jun 15
eric anderson replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Bud, The question was how to translate- from design heat loss calculated by using  ACCA manual J protocol to a yearly fuel usage.   I outlined a crude way to do it.  Is it perfect? Nope.  There are a lot of caveats to…"
Jun 15
Bud Poll replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Hi eric, Before we can reverse engineer that peak heat loss number from the manual J (MJ) report we need to know what they included when calculating it.  MJ is noted for over-estimating the appliance size, so has the 51,000 btus/hr number…"
Jun 15
Bob Blanchette replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"The issues is you size for PEAK, not AVERAGE conditions. This will vary by location, some areas have more constant weather than others. I have NEVER seen a heating system that was too small to do the job, I have seen MANY that are 3X the required…"
Jun 14
eric anderson replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Dan, As a ballpark figure, take the design heat loss and divide by design temp difference, this gives you btu’s per °F per hour.  Multiply this number by 24 hours (per day) and then multiply by heating degree days to get yearly …"
Jun 13
Dan Wise's discussion was featured

Convert BTU/hr in a Manual J to actual fuel usages

I cannot find any conversion table that translates the BTU/hr heat loss in a Manual J report to the amount of fuel required to heat the building to the design temperature.  In this case I'm using propane and I have calculated the 92,000 BTU/gal using the actual BTU/Hr X Degree Days and end up requiring over 30K gallons of propane for a heating system.  This cannot be correct.  Any guidance would be greatly appreciated.See More
Jun 10
Bud Poll replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"If 51,000 is your actual heat loss at the design temperature then you need a system capacity of 51,000 BTUs running continuously to maintain the set temperature.  A 60,000 BTU boiler running at 95% efficiency would just barely keep up. …"
Jun 10
Dan Wise replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Hi Bud,  My total heat loss per hour is 51,000 BTU/Hr with a design temperature difference of 48 degrees.  I am using 3900 degree days to figure the heating requirements.   Thanks for any guidance you may provide. Thanks,  Dan"
Jun 10
Bud Poll replied to Dan Wise's discussion Convert BTU/hr in a Manual J to actual fuel usages
"Hi Dan, That would be close to correct if every day was at the design temperature.  I don't use Manual J, so tell me what you have for the design temperature heat loss per hour and then the total heat loss per year at your local HDD. Bud"
Jun 9
Dan Wise posted a discussion

Convert BTU/hr in a Manual J to actual fuel usages

I cannot find any conversion table that translates the BTU/hr heat loss in a Manual J report to the amount of fuel required to heat the building to the design temperature.  In this case I'm using propane and I have calculated the 92,000 BTU/gal using the actual BTU/Hr X Degree Days and end up requiring over 30K gallons of propane for a heating system.  This cannot be correct.  Any guidance would be greatly appreciated.See More
Jun 9

Profile Information

Company
Grand Design Group
Professional Certification
CGP
Professional Interests
National Green Building Standard consulting and verification services.
Construction Management and Project Planning
Website URL
http://www.granddesigngroup.us

Comment Wall (1 comment)

You need to be a member of Home Energy Pros to add comments!

Join Home Energy Pros

At 1:32pm on June 29, 2014, Diane Chojnowski said…

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to add your profile photo and be sure to put your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Reading the Invisco description you will find that it is designed to be surrounded by cellulose to…"
6 hours ago
Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, I think cost of operation is always a factor but I am not sure I would leave it just cfm.…"
6 hours ago

Paul DelVaglio just added their location.
(via Member Map)

7 hours ago
Paul DelVaglio posted a photo
8 hours ago
reflintorm replied to Jamie Kaye's discussion Flickering LED lights
"I think, Better to replace the dimmer switch if it is not recovered then once go through the…"
12 hours ago
Kurt Shafer replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Glen,  You are the first person who has ever told me they prefer lower CFM. What you left out…"
22 hours ago
Glen Gallo replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Tamarack has lower CFM than typical fans and has a insulated lid that automatically closes when fan…"
22 hours ago
Tom Conlon's discussion was featured

Whole House Fans - Love 'Em or Not?

I just searched this forum for "Whole House Fan", but I didn't find much about them (except …See More
yesterday
Tom White shared Brandon Walton's blog post on Twitter
yesterday
Brandon Walton's blog post was featured

12 Things Every Home Performance Contractor Should Have on Their Work Truck

Every home is unique and differs from the last. It would be a perfect world (from a project…See More
yesterday
Griffin Hagle replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
yesterday
Griffin Hagle replied to Tom Conlon's discussion Whole House Fans - Love 'Em or Not?
"Kurt, Whoops, looks like I got my links mixed up. Thanks for pointing that out. Here's the…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service