This is what happens when you get a hole in your ground source heat pipes.. Sintec were back onsite this week to grout the pipes into the boreholes this involves pressure testing them first to make sure they'll work when the system is commissioned -good times. They couldn't get pressure in the last pipe which generally means theres a hole in it and they have to pull the 70m pipe out by hand and replace it -bad times
After 6 weeks the drilling is finally complete and the rig is taken off site..phew
Excavations continue as the external drains
are put in, I never though I'd become so preoccupied with holes in
the ground (unlike a group of Slade MA students who I recently met
at the Merz barn) but the cost of digging trenches and holes out of
the bedrock means this aspect of the redevelopment is getting quite
a lot of my attention.
Needless to say it was a bit of a nasty surprise to find the two giant concrete rings that have just arrived onsite need a hole 3m deep, to provide an inspection pit for the ground source heat system, it all seemed so simple on paper..
After a few weeks of technical and mechanical problems the drilling for the ground source heat pumps seems to be getting into its groove. They are just moving onto the 5th borehole and the last two have reached the desired depth of 75m, this seems to have been achieved by the addition of biodegradable industrial strength washing up liquid, which is added to the water used during the drilling process. Only four more to go..
After much anticipation the drilling rig has arrived on site to start work on the ground source heat pumps. Progress has not been easy so far the drilling rig has been delayed, in need of repair, missing parts and now appears to have found the 'wrong kind of rock' and this is only day three, lets hope it gets better from here. We also have scaffolders, roofers and dry stone wallers on site this week and suddenly it feels very much like a building site, theres mixed feelings about that but mainly pleased things are progressing, just keep off the grass!
An interesting site meeting today to discuss and co-ordinate the process for the installation of the ground source heat system for Lawson Park. This system is designed to extract heat from the earth to provide the heating and hot water for the new building. As the geology of the site is principally bedrock, a series of seven vertical boreholes are going be drilled, up to 70m deep, these are then connected via a loop system filled with refrigerant to a heat exchange system which connects to the underfloor heating and hot water system.
For more information on ground source heat pumps