28/04/2003 1 3 rd IIASA-TITECH Technical Meeting 21 st – 22 nd September 2003, Vienna Center for the Management of Environmental and Social Responsibility (CMER) INSEAD Boulevard de Constance Fontainebleau 77300 http://benjamin.warr.free.fr Resource EXergy Services Forecasts REXS-F An economic forecasting model with quasi-logistic technical progress
Resource EXergy Services Forecasts REXS-F using an economic forecasting model with quasi-logistic technical progress.
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28/04/2003 1
3rd IIASA-TITECH Technical Meeting21st – 22nd September 2003, Vienna
Center for the Management of Environmental and Social Responsibility (CMER)INSEAD
Boulevard de ConstanceFontainebleau
77300http://benjamin.warr.free.fr
Resource EXergy Services ForecastsREXS-F
An economic forecasting model with quasi-logistic technical progress
28/04/2003 2
Overview
– Reminder of REXS model• Historical trends in resource use
– Energy Intensity– Conversion Efficiency,
and economic output.
– Forecasts of output varying future trends of• Energy Intensity• Conversion Efficiency,
for JAPAN and the US
28/04/2003 3
Reminder of REXS economic output module (ICT components optional)
CumulativeProductionMonetaryMonetary
Output
Gross Output
Labour Capital
Linexparameter a
Linexparameter b
ExergyServ ices
ICT Fraction ofCapital
LinexParameter c
ICT CapitalGrowth Rate
28/04/2003 4
Common practice
Yt is output at time t, given by Q a function of,• Kt , Lt , Rt inputs of capital, labour and natural
Trend of “Dematerialisation” – a constrainton future productivity ?
Simulated and empirical primary exergy intensity of output, USA 1900-2000
0
0.2
0.4
0.6
0.8
1
1.2
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990
year
r/y
(190
0=1)
empirical
simulated
28/04/2003 9
Aggregate conversion efficiencies have improved significantly but are they slowing?
0
0,02
0,04
0,06
0,08
0,1
0,12
0,14
0,16
0,18
25 695 1486 2660 4677 7113
cumulative primary exergy production (eJ)
tech
nic
al
eff
icie
ncy
, f
empirical (U/R)"
bilogistic model
Source Data: Ayres, Ayres and Warr, 2003
28/04/2003 10
Could the future rate of technical efficiency growth also be a constraint?
Rate of change of aggregate technical efficiencyof primary exergy conversion, USA 1900-2000
0
0.0005
0.001
0.0015
0.002
0.0025
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00
cumulative production (1900=1)
rate
of c
hang
e
10 yr moving average
28/04/2003 11
REXS Projections of future outputPROJECTIONS AAltering the future rates of the energy intensity of outputThe average decay rate of the exergy intensity of output (R/GDP) for the period 1900-1998 is 1.2% The simulations involved increasing or decreasing this parameter from 1998 onwards, while keeping the values of all other parameters fixed.PROJECTIONS BThe future growth rate of technical efficiency of exergy conversion is uncertain. We tested 3 alternatives, keeping the ‘demat rate’ at 1.2%s
28/04/2003 12
Trends in technical efficiency for other countries
Aggregate conversion efficiency of commercial fuel exergy to useful work,1960-1998
0.00
0.05
0.10
0.15
0.20
0.25
0.30
1960 1965 1970 1975 1980 1985 1990 1995
year
per
cen
tag
e (%
)
France Germany Japan UK US
28/04/2003 13
Possible trajectories for future technical efficiency (US)
P o s s i b l e t r a j e c t o r i e s o f t e c h n i c a l e f f i c i e n c y w i t h p r i m a r y e x e r g y p r o d u c t i o n e x p e r i e n c e , U S 1 9 0 0 - 2 0 5 0
E m p i r i c a l t r e n d f r o m 1 9 0 0 t o 2 0 0 0
d o u b l i n g o f e x p e r i e n c e a n d c u m u l a t i v e p r i m a r y e x e r g y p r o d u c t i o n
1 3 0 %
1 2 0 %
1 1 5 %
P l a u s i b l ei m p r o v e m e n t o n c u r r e n t e f f i c i e n c y o f e x e r g y c o n v e r s i o n
S i m u l a t i o n r e s u l t s u s i n g t h e p l a u s i b l e t r a j e c t o r i e s o f t e c h n i c a l e f f i c i e n c y g r o w t h a s a f u n c t i o n o f c u m u l a t i v e p r i m a r y e x e r g y p r o d u c t i o n
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Forecast Gross Output (GDP), US 2000-2050
Forecast Gross Output REXS F US100
45
33.75
22.5
11.25
01900 1918 1936 1954 1972 1990 2008 2026 2044
year
empiricallowmidhigh
Simulation results using the plausible trajectories of technical efficiency growth as a function of cumulative primary exergy production
GDP (1900=1)
HIGHInitial ~3% growth rate, for 130% target increase in technical efficiency.
MIDInitial 1.5% growth rate for target120% improvement in efficiency.
LOWShrinking economy at rate of 2 - 2.5% after 2010 if the target technical efficiency is only 115% greater than the current.
28/04/2003 15
Marginal productivity of exergy services (work)
highest
Graph for Marginal Productivity of Exergy Services
1
0.85
0.7
0.55
0.41900 1920 1940 1960 1980 2000 2020 2040
Time (Year)
Marginal Productivity of Exergy Services : flin04Marginal Productivity of Exergy Services : flin03Marginal Productivity of Exergy Services : flin02Marginal Productivity of Exergy Services : flin01Marginal Productivity of Exergy Services : Empirical Data
Increasing marginal productivity of exergy services as technological progress increases.
Faster rate of marginal productivity growth with slower ratesof technological progress.
Once the economy slows the marginal productivity of capitalis negatively affected.
Simulation results using the plausible trajectories of technical efficiency growth as a function of cumulative primary exergy production
28/04/2003 16
Marginal productivity of capitalGraph for Marginal Productivity of Capital
0.04
-0.02
-0.08
-0.14
-0.21900 1920 1940 1960 1980 2000 2020 2040
Time (Year)
Marginal Productivity of Capital : flin04Marginal Productivity of Capital : flin03Marginal Productivity of Capital : flin02Marginal Productivity of Capital : flin01Marginal Productivity of Capital : Empirical Data
Slower growth in the marginal productivity of capital with faster rates of technological productivity growth
Simulation results using the plausible trajectories of technical efficiency growth as a function of cumulative primary exergy production
low and mid
high
28/04/2003 17
Marginal productivity of labourGraph for Marginal Productivity of Labour
0.6
0.45
0.3
0.15
01900 1920 1940 1960 1980 2000 2020 2040
Time (Year)
Marginal Productivity of Labour : flin04Marginal Productivity of Labour : flin03Marginal Productivity of Labour : flin02Marginal Productivity of Labour : flin01Marginal Productivity of Labour : Empirical Data
Simulation results using the plausible trajectories of technical efficiency growth as a function of cumulative primary exergy production
Slower decrease in the marginal productivity of labour with faster rate of technological productivity growth
28/04/2003 18
US “Dematerialisation” forecasts #1Empirical Data25% 50% 75% 95%
Primary Exergy Intensity of Output2
1.5
1
0.5
01900 1938 1975 2013 2050
Time (Year)
dmat_sensEmpirical Data25% 50% 75% 95%
Gross Output60
45
30
15
01900 1938 1975 2013 2050
Time (Year)
Exergy Intensity of Output(index 1900 = 1)
Forecast GDP (1900 = 1)for sensitivity tests varying the "dematerialisation rate" from 1.2 to 1.5% per annum
28/04/2003 19
US “Dematerialisation” forecasts #2Empirical Data25% 50% 75% 95%
Technical Efficiency of Primary Exergy Conversion0.4
the "dematerialisation rate" from 1.2 to 1.5% per annum
28/04/2003 20
US “Dematerialisation” forecasts #3
"Dematerialisation" Sensitivity Analysis
Varying the "exergy intensity of output" reduction rate between 1.2 and 1.5%, using an exponential distribution (order: 0, stretch: 0.015), using the parameters for the high trajectory of technical efficiency growth.
Empirical Data25% 50% 75% 95%
Marginal Productivity of Labour0.6
0.45
0.3
0.15
01900 1938 1975 2013 2050
Time (Year)
MP of Labour
dmat_sensEmpirical Data25% 50% 75% 95%
Marginal Productivity of Capital0.04
-0.02
-0.08
-0.14
-0.21900 1938 1975 2013 2050
Time (Year)
MP of Capital
dmat_sensEmpirical Data25% 50% 75% 95%
Marginal Productivity of Exergy Services1
0.9
0.8
0.7
0.61900 1938 1975 2013 2050
Time (Year)
MP of Exergy Services
28/04/2003 21
Exergy Service Breakdown Comparison of Japan and USF r a c t io n s o f fo s s i l fu e l e x e r g y a p p a r e n t c o n s u m p t io n ,