"It seems a bit wasteful to use NG for such a low temperature application as space heat. If a heat pump with a seasonal COP of 2 to 3 is used and it's power source is a CCNG(combined cycle natural gas) power plant with thermal efficiency around…"
""The famous rationale for going to high performance was, if you beef up your envelope enough you can change or reduce the expense needed for your HVAC system. We’re not finding this in Minnesota. In the summer, dehumidification is…"
"When and if we have far more variable renewable power available and therefore grid operators need much more demand/response opportunity via TOU power pricing and thermal and electrical storage via car batteries,hot water, ice,etc., then I will need…"
"Dennis, I guess a high efficiency gas heater would mean less CO2 than electric resistance from coal and maybe even natural gas power unless a CCNG plant. Hard to say how expensive reliable CCS will be. The coal plant is located in central North…"
"The only downside I can see is setting to a lower temperature and do not program a return time because your not sure or don't have a progammable. On returning it will take longer to reach higher temperature.
"The Canadian manufactures are the best I found. They are pulltruded fiber glass from Fibretech in Ontario. Check there web site for specs. Accurate Dorwin of Winnipeg was my second choice.Well radiant will certainly work with geo. But be aware of…"
"Overall the article raises the right issues and addresses them well. Some other points: I've found on my ICF passive solar house in central Minnesota after four heating seasons that high efficiency triple glazed windows are the best money…"
"Remember the PV system was tracking the sun daily and seasonally which for residential roof top installations would be difficult if not impractical. It appears that PV comes out better with tracking unless the residence has an above average wind…"
"At a Minnesota Energy Conference I met a wind and PV solar installer. He sells and installs both Southwest wind systems and Sunpower PV(one of the highest efficiencies in the industry) systems. He monitored both a 2.4 kW wind turbine and a 4.14 kW…"
"It's a reasonable start anyway. However the 35 foot tower is no where near high enough, especially with the tall trees in the photo. 90 ft would be a minimum height and mite double the average wind speed to get eight times the kwh but 110 would…"
This group will focus on the issues associated with incorporating renewable energy sources like Solar PV, Solar Thermal, Geothermal, Small Wind, Small Hydro into the Residential Energy Efficiency and Sustainability business model.
"The idea of geothermal seasonal heat storage has been played with in Europe and the US for sometime now. I found a 60 unit single family housing development in Alberta Canada that installed a system that they feel will provide 90% of space heating…"
Charlie Weschler sits down with Grace and Corbett and gives fascinating examples of the complexity of indoor air chemistry. He is an air quality legend, a professor on three continents, and a super nice guy.