I'm asked to estimate the heating energy savings from air sealing a 10,000 sf house built in 1900. The former mansion has 6 undampered chimneys and about 40 windows needing repair as well as doors, some needing replacement and all needing weatherstripping. The house has a semi heated basement, and three stories on top of it.

The house has new radiators in all rooms and a 92% efficient boiler.

How do I estimate the potential heating savings from all the air sealing possible here?

George Matthews

 

Views: 201

Reply to This

Replies to This Discussion

"A Journey of a Thousand Miles starts with a single step."

Try breaking the house into smaller pieces and working on the "knowns" first.

The most accurate way would be to have a blower door test conducted.  Once you know how much infiltration you have you should be able to determine the total energy waste associated with that air infiltration.

The Retrotec blower door manual has this chart for estimating the energy wasted due to air leakage. This should help you.

David,

Thanks! That is exactly the information I needed to make sense of the blower door data.

Now I need to learn how to estimate the potential energy savings from changing out a 23 y.o. boiler that was 80% efficient when new. The replacement would be a 95% boiler potentially coupled with solar hot water. There are 25 people here who take showers daily.

 

Also, I've read about heat exchangers to recapture waste heat from the pipes running from showers. "EcoDrain" is one such unit. Does anyone have experience with these? And if so what type of efficiencies are they finding?

George,

If you know the annual fuel heating energy bill you can make an estimate. If you know the cost per therm of natural gas or per gallon of fuel oil you can estimate the total amount of energy required.  For example, for a 80% efficient propane unit and if we assume 340 gallons of propane for heating...
340 * 91,300 * 0.8 = 24.8 MMBTU produced.  We then divide this by 0.95 and 91300 for the new boiler to get 286 gallons required for the new furnace. (91300 is the # of BTU's in 1 gal of propane).  I hope you see my logic...  Or just divide .8 by .95 to get the ratio of new energy required (84%), 16% less energy.

RSS

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 commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Bob, Good idea. I see that you are a window energy reduction expert. You might consider adding…"
7 minutes ago
Robert (Bob) Bacon commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Kurt, I would explain what energy/efficiency problem this device solves and explain the science the…"
37 minutes ago
Ben Jacobs replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"I agree that in many homes the indoor air sucks.  However, a lot of this problem is caused…"
2 hours ago
Kurt Shafer commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Tom, thank you for your odd reference to a leaky duck. It is a bit off topic since I was not asking…"
3 hours ago
Tom Delconte commented on Kurt Shafer's blog post What is your opinion about members promoting products here?
"Shameless self promotion here sucks like a leaky duck!"
4 hours ago
Profile IconJohn A Deuth, Lisa M. Harr and Ramon Aguirre joined Home Energy Pros
4 hours ago
Don Fitchett posted a blog post

Small Businesses: Diversify with Infrared Thermography Services, Save Your Business, Save the Country...

HERS should all offer Infrared Thermography Services.It is all ways great advice for small…See More
15 hours ago
Richard Beyer replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
""There are thousands of potential harmful products that can contribute to existing homes poor…"
16 hours ago
Richard Beyer replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"Barbara, We both know a fan switch will only conserve on energy. What is Berkeley devising to clean…"
16 hours ago
Richard Beyer replied to Mike Kandel's discussion Our Homes Suck – And That's Why Our Kids Have Sinus Problems
"Ted no one can help anyone with their head stuck in the sand. All you said is MONEY is your God.…"
16 hours ago
Richard Beyer replied to Richard Beyer's discussion Spontaneous Combustion and Flash Fire regarding Spray Foam Insulation
"Hal, Thank you for laying out those facts. Fire safety is just as important of an issue as energy…"
17 hours ago
Don Fitchett commented on Diane Chojnowski's group Facebook Pages
"I just went through the 1st 2 pages of member's facebook pages liking them. While our training…"
18 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service