Igor Zhadanovsky
  • West Newton, MA
  • United States
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Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Seith and Kurt: Thanks for your comments. Kurt’s statements sounds right but as usual, devil is in details: Lower quality heat is easier to obtain and generally costs less. Designing your emitter system to operate using a lower quality heat…"
Nov 20, 2013
Kurt Albershardt commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Hot water is a lower quality heat source than steam.  100ºF water is a lower quality heat source than 180ºF water.  Lower quality heat is easier to obtain and generally costs less. Designing your emitter system to operate using a…"
Nov 20, 2013
Seth Rutledge commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Am I understanding this correctly: basically lower temperature water does not transfer heat as efficiently as higher temp. water; so even if theoretically you captured 100% of the energy of the fuel if the energy is the same temp. as it is outside…"
Nov 20, 2013
Kurt Albershardt commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"I heartily agree that AFUE needs a major re-work. I do believe that measuring overall system efficiency (in something like BTUs per square foot per degree-day) will factor in these second law effects.   As long as we include pumping costs, it…"
Jul 3, 2013
Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"John, thanks for good words about article. It took me a while to figure out how temperatures, AFUE, energetic and exergetic efficiencies are interconnected for  heating systems. Fortunately, found very logical explanation - Szargut…"
Jun 8, 2013
John M Rogers commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"It's hard for me to understand how impatient Curt is behaving about having a college level discussion on some simple basic ideas. Give me more conceps to let simmer in my knowledge base, please. Wonderful article"
Jun 8, 2013
Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Curt, 1lb stone weight at 100 ft elevation is the same at 1 ft,  but has potential energy 100 times  more relative to ground level. Temperature parameter for potential energy of 1  BTU is similar to elevation for stone - it indicates…"
Jun 8, 2013
Curt Kinder commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Thanks for the review of thermodynamics. Fortunately, I've already eaten a tasty lunch. Chilly homeowners care not a wit about the work potential of heat they need to stay warm. They are interested in safety, health, comfort and efficiency,…"
Jun 7, 2013
Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"The Laws of Thermodynamics 1. Energy is conserved. 2. dW ≤ dQ ≤ TdS + Sdt [Condensed form for experts] 3. S=0 at T=0.   1. You can’t win. 2. You can’t even break even. 3. You can’t leave the game.   1.…"
Jun 7, 2013
Curt Kinder commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"So a homeowner is really better off with an 80% AFUE appliance compared with a 90+% model? Why would any homeowner care about "Exergy"? Let me go check my Exergy balance at my online banking and I'll get right back to you!"
Jun 7, 2013
Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Please, check Table 1 in blog.  From exergy point of view, regular hot water boiler is more efficient/economical compared to hot water condensing boiler."
Jun 7, 2013
Curt Kinder commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"How does this relate to a typical homeowner choosing between alternatives to heat a house?"
Jun 6, 2013
Igor Zhadanovsky commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"Curt, The concept of Exergy came from a fundamental law of Thermodynamic and is applicable to thermal electric power plant,  home boiler or furnace or any other process which involve energy usage.  For the particular example of condensing…"
Jun 6, 2013
Eric Kjelshus commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"The biggest repair(replacement) I do is to change to PVC flue so not use old chimney and then get will not  back draft.   With low price of Natural gas its very hard to just sell  on just cost ROI.  sell on comfort and safety.…"
Jun 6, 2013
Curt Kinder commented on Igor Zhadanovsky's blog post Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)
"This thread seems to (perhaps deliberately) confuse the overall efficiency (fire to wire) of a thermal electric power plant with the thermal efficiency (fire to water or air) of a home boiler or furnace. While the concept of Exergy may be…"
Jun 6, 2013
Igor Zhadanovsky's blog post was featured

Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)

“It’s amazing. Every year, we find somebody who comes up with a way of going around the second law (of Thermodynamics) and somehow convinces people who are very smart that it will work.”      MIT lecture on  Thermodynamics and & Kinetics, Spring 2008  Since the 1980s, hot water condensing boilers (CB) have aimed to improve efficiency by utilizing the heat of water vapor condensation from flue gas. Modern CB…See More
Jun 4, 2013

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AEC
Professional Interests
energy efficiency, steam heating retrofits

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Igor Zhadanovsky's Blog

Scrutinizing Condensing Boilers With the Second Law of Thermodynamics (SLT)

“It’s amazing. Every year, we find somebody who comes up with a way of going around the second law (of Thermodynamics) and somehow convinces people who are very smart that it will work.”      MIT lecture on  Thermodynamics and & Kinetics, Spring 2008

 

 

Since the 1980s, hot water condensing boilers (CB) have…

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Posted on May 29, 2013 at 9:31am — 15 Comments

Bang for the buck: deep-energy retrofit approach

"Americans can always be counted on to do the right thing...after they have exhausted all other possibilities."                                                                                                      Winston Churchill

How much does it cost to perform a deep-energy retrofit at a 100-year-old single-family home? Thanks to a recent study in Utica, New York, we now know the answer: about $100,000.…

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Posted on January 3, 2013 at 1:44pm — 32 Comments

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At 6:24am on December 19, 2012, Diane Chojnowski said…

Hi Igor,

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 upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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