Monday, March 22, 2010

My suggestion for a Shanghai Abstract

There is a good chance we can get a paper on this project to the annual global conference of SET in Shanghai. The abstract has to be submitted by April 10.  I am suggesting the following, which reflects most of the thinking that has gone into it, and now that it is working, it is pretty clearly sorted out in my mind.

  • "In the world of Ground Source heatpumps, there is much discussion of the best arrangement of sourcing, comparison of boreholes with horizontal arrangements, the depth and number of boreholes, and the seasonal performance of GSHP compared with air-source. With deep boreholes, solar heat can take decades to reach the depths, and there is a risk of annually declining performance if the soil does not recover to the previous season’s temperature before the next winter. After several years, the deep soil can be permanently chilled. There is a good case for augmenting the performance of GSHP with additional sources, combining solar panels with the ground loop, to provide immediate diurnial benefits, and to increase the chance of interseasonal storage, dependent on the depth and quality of soil."
  •    "This paper presents a discussion of the viability of hybridising the GSHP to improve the coefficient of performance. An experimental rig has been constructed during winter 2009-2010 on a full size occupied house in the city of Nottingham, England. The rig augments an existing GSHP installation. For maintaining ground temperature, warmth is more useful than heat. The south facing structures collect solar heat on sunny days, bright-sky air warmth on dull days, and air warmth even during summer nights. The warmth is sent directly to the borehole, to be recovered the same day (diurnial) during winter and equinox. The collectors continue to work through the summer and are large enough to capture long term warmth to prepare for the following winter season (interseasonal). Data is being collected in real time and can be compared with previous data records - temperatures, electricity consumption, liquid flows in different parts of the system, weather and human factors. In the initial testing, the diurnial benefits have been immediately realised."
  •     "The technology for augmenting the GSHP is considerably cheaper than the original boreholes and of the GSHP itself, and once fully quantified could lead to a reduction of the number and length of boreholes, dependent on the size of the solar installation and the predicted weather statistics for the location of the building. The technology can also improve the performance of horizontal ground source diurnally."

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