Dan Wise
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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, 2014.

 

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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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014
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, 2014

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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

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

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