Bruce Ackerman
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Countercurrent heat exchangers

Started this discussion. Last reply by Barry Stephens Jan 14. 2 Replies

I've been reading a Christmas-gift book called "Vital Circuits" by Steven Vogel. A fun description of the heart and circulatory system from a physics perspective, in particular from a background in…Continue

 

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Barry Stephens replied to Bruce Ackerman's discussion Countercurrent heat exchangers
"The counter-flow heat exchanger is part of what sets the Zehnder HRVs and ERVs apart. This is why they achieve up to 90+ percent recovery efficiency, which is much higher than units using cross-flow exchangers."
Jan 14
Thomas Ailstock replied to Bruce Ackerman's discussion Countercurrent heat exchangers
"Bruce, thanks for the post. This got me thinking and reading more about counter-current vs alternatives. Here is a link to a good article on the topic which provides some pictures as well. Counter Flow Heat Exchanger. I am most familiar with…"
Jan 14
Bruce Ackerman posted a discussion

Countercurrent heat exchangers

I've been reading a Christmas-gift book called "Vital Circuits" by Steven Vogel. A fun description of the heart and circulatory system from a physics perspective, in particular from a background in fluid dynamics. I thought I'd share an insight -- perhaps old news to this group, but maybe not.Vogel describes three categories of heat exchangers:1. Cross-flow (most common in technology) - picture refrigerator coils with a fan blowing air across them. At best the fluid in the coils can be brought…See More
Jan 11
Bruce Ackerman replied to Tom Barrett's discussion How Much Energy Do Building Energy Codes Really Save? Evidence from California
"I'm glad to see this discussion, difficult though it is. I see several points, to try to summarize... 1. A home's efficiency, let alone the efficiency of the overall lifestyle of the occupants, includes a lot more than electricity. Natural…"
Mar 11, 2015
Bruce Ackerman replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"We have gas cooking and gas clothes dryer in the summer as well. Dryer used less than the washer due to clotheslines both indoors and outdoors. Household size varies but typically about 4 people, for showers, hot water for dishwasher and…"
Jan 2, 2015
Bruce Ackerman replied to Damien Greenfield's discussion Is there is cost saving for you in having a tankless water heater?
"We installed a Noritz natural-gas-fired tankless in 2009 and have definitely realized gas savings -- here are our average therms of gas used per month for the summer months (so as to eliminate the differences due to our heating system upgrade or the…"
Jan 2, 2015
Bruce Ackerman replied to Tom DelConte's discussion Are efficient LED bulbs worth the price?
"I've been watching and testing LEDs for several years and can say that, while there is definitely variability both in quality and price, the technology is maturing rapidly. I now use them in 75% of the applications in my house. Yes, in this…"
Dec 13, 2012
Bruce Ackerman replied to Dennis Cheslik's discussion Are Reverse Osmosis water systems actually eco-friendly?
"The waste water could not be recirculated back to the input of the purification system, but it could be used for other purposes. The 2 gallons of waste water contains the ions that were originally in the one gallon of de-ionized water. Is this RODI…"
May 19, 2011
Bruce Ackerman is now a member of Home Energy Pros
Jan 18, 2011

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Self employed
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Energy conservation & education, public policy and process, urban planning, PV including thin-film, digital signal processing, instrumentation, epidemiology
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Bruce Ackerman

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At 9:00pm on January 19, 2011, Diane Chojnowski said…

Hi Bruce,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos andupcoming 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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