16 NEWS FEATURE
of 16.34 W/m2
, a 22 mm thickness of
the pre-insulated phenolic ductwork system was needed compared with a 40 mm thickness for the mineral fi bre lagged ductwork.
By using thinner insulation, it should be possible to insulate greater lengths of pipe and ductwork with each delivery to site. This is especially important as many developers switch to heat networks, which require extensive pipework systems in addition to ventilation or air conditioning ductwork. Kingspan Technical Insulation commissioned RBL to carry out a study looking at how the effi ciency of the pipe and ductwork insulation could impact the number of site deliveries and associated carbon emissions.
TOTAL COVERAGE PER LOAD To understand this, RBL fi rst looked at the total length of pipework or area of ductwork which could be insulated to BS 5422:2009 with a single delivery from a typical, 44 tonnes haulage vehicle. The analysis of pipework products considered the pipe insulation, pipe insulation support inserts and all associated packaging. Two different solutions were assessed across a range of pipework systems and pipe diameters: mineral fi bre pipe insulation, and phenolic pipe insulation.
The outputs showed that between 8.33% and 146.53% more linear metres
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of pipework could be insulated with the phenolic pipe insulation specifi cation, depending on the pipework system type and pipe diameters.
RBL then looked at two different ductwork solutions including coupling systems for warm air and dual ductwork: sheet metal ductwork lagged with mineral fi bre insulation, and pre-insulated phenolic ductwork.
This showed that between 33% - 40% additional square metres of the pre-insulated phenolic ductwork could be carried in a 44 tonne lorry.
CARBON EMISSIONS
Based on this analysis, RBL were then able to calculate the expected greenhouse gas (GHG) emissions associated with deliveries of the insulation solutions for a range of applications.
These calculations initially looked at the number of deliveries and associated GHG emissions when delivering pipe insulation and insulated pipe support inserts for 10,000 metre, 20,000 metre and 40,000 metre lengths of pipework. The results showed that total GHG emissions could be as much as 66.67% lower with the phenolic pipe insulation specifi cation compared with the mineral fi bre specifi cation. For the ductwork insulation solution comparison, RBL considered the number of deliveries needed to provide 1,000 m2 2,000 m2
and 4,000 m2
Again, the results showed that the total GHG emissions with the pre-insulated phenolic ductwork could be up to 33.41% lower than the mineral fi bre lagged sheet metal alternative.
They then carried out additional modelling based on the full building service specifi cations from several real-life case studies. This modelling assumed all materials were being sent from the same manufacturing site in Herefordshire and includes emissions from complete round journeys. The results supported those from the initial modelling, showing that emissions from pipework deliveries were reduced by half on the case study building, whilst those from ductwork could be cut by as much as 33.33%.
A FOCUS ON THE DETAILS The extensive potential sources of embodied emissions can make it diffi cult for developers and housebuilders to know where to start when addressing this issue. RBL’s study shows that by breaking the issue down into smaller focus areas, such as working with the building services engineers to consider the effi ciency of building service insulation and its impact on haulage, it’s possible to achieve notable reductions in these emissions through relatively minor adjustments in specifi cations.
, areas of ductwork.
Marc Nickels is business development manager at Kingspan Technical Insulation
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