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
"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."
"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…"
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
"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…"
"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…"
"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…"
"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…"
"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…"
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New York is increasing its energy standards and is investigating the possibility of implementing the Passive House Standard for new construction and retrofit projects. Interviewee: Ken Levenson, with NY Passive House Assoc and 475.