Retrofit 2050
Retrofit 2050: upgrading UK housing stock
A
joint publication by the IET and Nottingham Trent University entitled
Scaling up Retrofit 2050 claims that “a nationwide programme
to upgrade the existing housing stock is the only way for the UK to
achieve its carbon saving goals.” It points out that domestic
energy consumption “accounts for about 30% of the UK’s total
energy budget, and 20% of UK greenhouse gas emissions” and claims
that since “80% of the homes we will be living in by 2050 have
already been built, a nationwide programme of deep retrofits and
refurbishment of the existing stock is the only way to deliver the
required carbon savings.” The paper goes on to describe barriers to
progress, and makes recommendations for action, focussing on social
housing. It is available at:
The
following papers focus on a single aspect of retrofitting, namely the
measurement of U-values in existing structures. Such measurements can
be time-consuming and difficult, and the papers illustrate both the
reasons for the difficulties and some of the approaches taken to
overcome them and yield quicker results.
In-situ
measurement of U-value,
Ludmilla Kosmina, BRE September 2016.
This
paper provides a guide to in situ U-value measurement of walls in
existing dwellings under steady state conditions, using heat flow
elements and temperature sensors. Examples
of data sets leading to valid and invalid results are
given, and the case is put for dynamic methods which could shorten
the time required. Available at:
Inferring
the thermal resistance and effective thermal resistance of a wall
using frequent temperature and heat flux measurements,
Biddulph et al., Energy and Buildings, 2014.
A
clear exposition is given of a dynamic measurement method which
reduces time significantly, and allows measurement to take place
outside of the winter period. Nevertheless, three days can be needed
for a measurement. The dynamic model uses four unknowns to
characterise the wall, and the analysis is Bayesian. Available at:
A
novel method for the estimation of thermophysical properties of walls
from short and seasonally independent in-situ surveys. Gori, V., (2017) Doctoral thesis, UCL (University College London).
This
thesis builds on the work described in the previous paper and
includes a review of the literature on the subject.
Available
at: http://discovery.ucl.ac.uk/1568418/
A
practical method for in situ thermal characterisation of walls,
Sassine, E., Case Studies in Thermal Engineering, 2016
This
paper describes a method using complex Fourier analysis, described as
fast, but it nevertheless refers to periods of several days for
measurements.
Available
at:
A
response-factor based method for the rapid in situ determination of a
wall’s thermal resistance in existing buildings
Arash
Rasooli et \al., 2016, Energy and Buildings.
The
authors describe a measurement technique based on excitation pulses
and the theory of response factors, which is said to take hours
rather than days.
Available
at:
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