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Borehole versus horizontal collector heatpumps

  • 26-05-2006 3:20pm
    #1
    iplogger1
    Registered Users, Registered Users 2 Posts: 277 ✭✭


    What is the real deal with borehole geothermal ?

    What type of ground is suitable for it and why would one opt for
    it in preference to the horizontal collector. Does it make sum
    presumption about wells/springs underground which might not
    always exist compared to horizontal collector which can more
    or less always expect to find the same general ground conditions
    for extracting useful heat ??

    My geology knowledge is obviously very limited here so I am
    interested in knowing from those who are more informed how
    these two methods of harvesting convertible heat energy from
    the ground (in the Irish climate) apply.

    I realise the capital expenditure on the borehole is higher but
    a few people mentioned it to me in passing recently and
    I didn't catch enough time to query them as to why they
    were thinking of borehole geothermal.

    ~ipl


Comments

  • #2
    gonk
    Closed Accounts Posts: 144 ✭✭gonk


    iplogger1 wrote:
    What is the real deal with borehole geothermal ?

    What type of ground is suitable for it and why would one opt for
    it in preference to the horizontal collector.

    The main reason for using a borehole collector is where space is restricted, say in an urban setting. If you didn't have a big enough site to put in the usual type of collector, you'd use the borehole.


  • #3
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,567 Mod ✭✭✭✭Capt'n Midnight


    http://www.iklimnet.com/save/groundsourceheatpumps%20.html
    Vertical Closed-Loop
    In a vertical closed-loop ground heat exchanger, a water/antifreeze mixture is circulated through sealed pipe loops buried in vertical bore holes. the bore holes are typically 150 to 200 feet deep. As with a horizontal closed-loop system, heat is transferred by the heat pump system, from the ground during the winter and to the ground during the summer. A vertical heat exchanger can be installed on smaller lots rather than a horizontal system.
    How deep would they need to be here ?


  • #4
    yop
    Moderators, Home & Garden Moderators, Regional Midwest Moderators, Regional West Moderators Posts: 16,724 Mod ✭✭✭✭yop


    From what little research I have done the Borehole retruns the highest COP of all the alternative energies, up to 7 on average about 6 from what I remember.
    They bore 2(I think!!) holes to about 120m in the ground.
    I think you would be talking about 3k more for the borehole option based on quotes I got.


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