More sensible ideas from NL

Discussion in 'Cycling Archive' started by Alex Potter, Jan 8, 2013.

  1. Alex Potter

    Alex Potter Guest

    Alex Potter, Jan 8, 2013
    #1
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  2. Alex Potter

    Tom Gardner Guest

    You forgot the quotes around "sensible" :)

    First idea: luminescent lines invented by a "designer". Let's
    see the half-life of the light intensity, and it's robustness.

    I was once at a lecture by a professor of engineering at
    Imperial College, who also lectured to "designers" at the RCA.
    He greatly enjoyed lecturing at the RCA, but had a word
    of caution about the results you might expect if you
    asked them to design an egg...
    - most students would produce something that was the
    same size and shape
    - good students would get a reasonable colour
    - excellent students would get the weight right
    - none would produce anything edible, because
    that wasn't their problem

    Second idea: geothermal energy by an "geothermal engineer".

    It would be interesting to understand the length of
    time for which sufficient energy is stored to keep ice
    melted, and whether it makes it more or less likely to
    create sheet ice due to the freeze-thaw effect,

    I can't say it wouldn't work, particularly since much of
    the NL has a high water table and the ground is therefore
    thermally conductive and has a high heat capacity.

    However, it isn't geothermal energy, which only provides a trickle
    of energy in most of the world. Rather it is "ground source"
    energy.
     
    Tom Gardner, Jan 8, 2013
    #2
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  3. Alex Potter

    Phil Cook Guest

    That phrase to me implies heat pumps and lots of pipes with refrigerant.
    What they were implying from the film was using the groundwater which is
    at about 10 deg C in urban areas to heat the surface.

    I didn't spot a single plastic hat or narrow farcility in the entire
    clip though :)
     
    Phil Cook, Jan 8, 2013
    #3
  4. Alex Potter

    Tom Gardner Guest

    Yes and no.

    Ground source can (and often is) associated with heat pumps,
    but the "refrigerant" can be water,

    Heat pumps can (and often are) associated with air source,
    i.e. air-con in reverse.

    In the case in question it /might/ be sufficient to simply
    circulate water from below, since I presume there's no
    requirement to raise the ground temp significantly above 0C.

    Background: a few metres down the temperature in the UK is 11C.

    See http://www.inference.phy.cam.ac.uk/withouthotair/c21/page_152.shtml
    which also includes a definition of what proportion of our
    heating we might get from ground source, and why combined
    heat and power surprisingly inefficient.
     
    Tom Gardner, Jan 8, 2013
    #4
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