The block work for the silo was completed, leaving a portion
missing to enable access for sheet materials inside. Installing the
auger was like a giant jigsaw puzzle, but made easy by the quality
Austrian engineering. With this is place, the wooden framework was
built around the auger to create a trough for the pellets to fall
into. The interior surfaces of the silo were covered with 25mm
Celotex insulation, a damp proof membrane and then plywood. Cutting
the sheets to meet the three-dimensional geometry of the silo
trough was extremely demanding and in hindsight better done using
CAD software (if you happen to know someone!) The roof was
constructed using layers of plywood, damp proof membrane and
fireproof plasterboard. A custom built metal door was built into
the silo wall.
Prior to installation there was a slight change to the design,
to use a flat plate heat exchanger to connect to the heating system
in the Hall. The key advantages of this were to:
- Enable separation of the pristine boiler and plant room heating
system from the old heating distribution system in the Hall
- Allow for the boiler and plant room system to be pressurised
whilst leaving the hall unpressurised, thereby reducing the risk of
leaks in the older pipe work.
The initial installation of the boiler, buffer tanks, flue and
associated components took place over the course of a week,
particularly allowing for delays due to icy roads which took the
Ecoliving van and installer Tim, skating into a nearby field!
There were various snagging and residual issues to be dealt with
into a second week, after which the boiler controls were configured
with the assistance of the manufacturer ETA in Austria who have
remote access to the boiler across the internet. Once completed
test-firing of the boiler took place.
Given the very cold conditions in mid-December, it was decided
to delay the changes to the existing oil-fired heating system in
the Hall until after the New Year. These changes, including the
introduction of heating zone controls, programmable thermostats,
new hot water cylinders and a full system power-flush, were carried
out during January.
The Hall heating and hot water were cutover to the wood pellet
boiler in late January, since when remaining activities have been
centred on any remaining snags and preparing the Renewable Heat