To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.

Mark Franks

ZmanZman Posts: 2,211Member ✭✭✭
As much as I love my Thursday new letter. this one is simply not true.

http://www.earthtechling.com/2013/05/new-york-city-could-turn-to-geothermal-heating/



Henry Gifford does a great job explaining this one http://www.greenbuildingadvisor.com/blogs/dept/green-building-blog/ground-source-heat-pumps-don-t-save-energy



Carl
· ·

Comments

  • SWEISWEI Posts: 4,670Member ✭✭✭✭
    Tough One

    Let's start with the clear factual error: the earth's core temperature has absolutely nothing to do with the suitability of an area for geo-exchange.



    Geo-exchange is not the universal solution many proponents claim; nor is it the scam which opponents sometimes make it out to be.  It works best when annual heating and cooling loads are *roughly* balanced (say within a 2:1 range)  and when soil moisture is high.  Payback over a modern ASHP can take quite awhile depending on the local climate.  Ground loop installation costs -- especially on existing sites -- can be prohibitive.  Depending on the source of electricity, it can produce less (or more) carbon impact than burning natural gas will.



    When correctly applied (sometimes in a hybrid system with GSHP plus a high efficiency boiler) and competently installed and managed it can produce excellent results.
    · ·
  • Robert O'BrienRobert O'Brien Posts: 2,227Member ✭✭
    COP

    What is upper limit on COP of ASHP,particularly mini split? I see this being the eventual "winner"
    · ·
  • ZmanZman Posts: 2,211Member ✭✭✭
    Facts

    My point is that their is not a correct fact in the article. The heat pumps run on electricity which is produced in a fossil fuel burning power plant. As Henry points out the net efficiency and carbon footprint doesn't change. A 3 COP from a 30% efficient power source is no different than a 90% efficient boiler. A 3 COP running off PV panels is a different matter.

    CArl
    · ·
  • hot rodhot rod Posts: 3,692Member ✭✭✭
    instead of a loop field

    This company uses a fence as the loop field. Clever idea.



    A GSHP heat pump is really moving solar energy. The energy from the ground to provide heating is from the sun.



    I suppose you could make an argument that the coal is also a result of solar energy, from vegetation that grew 400 million years ago :).



    A heat pump powered by PV modules would be a nice, but currently expensive, option.







    http://www.hautec.co.uk/#fence
    png
    png
    Screen shot 2013-06-27 at 11.16.16 AM.png
    0B
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
    · ·
This discussion has been closed.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!