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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
1
International Conference on Smart Energy Systems and 4th Generation
District Heating
Copenhagen, 25-26 August 2015
Modelling of Technological Solutions
to 4th Generation DH Systems
PhD Edgars Vigants,
PhD Girts Vigants,
Dr.hab.sc.ing. Ivars Veidenbergs,
Dr.hab.sc.ing.Dagnija Blumberga
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Contents
1. Research goal
2. Research history
3. Technological solution
4. Heat and mass transfer analysis
5. Results
6. Conclusions
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Research Goal
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To create efficient technological
solutions of thermal energy sources
for low temperature district heating
systems
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Research hystory
4
Fuel switch from heavy oil to local wood biomass
The transition from the 2 GDH to the 3 GDH
(grid temperature reduction from 120/70 to 90/60)
Design and installation of flue gas condenser
Further lowering of DH return temperature
Gradually transition to 4th Generation DH
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Efficient technological solution (1)
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Efficient technological solution (2)
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Condensing unit in Ludza DH boiler house7
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Efficient technological solution (3)
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Experimental data of condensing unit
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0
5
10
15
20
25
30
40 45 50 55 60
Cond
ense
r effi
cienc
y in
dica
tor
E cd,
%
DH return temperature Tr, 0C
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Efficient technological solution (4)
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Heat and mass transfer parameters (1)
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0
100
200
300
400
500
600
700
800
900
1000
0 0,05 0,1 0,15 0,2 0,25 0,3 0,35
Tem
pera
ture
T, o
C
Absolute humidity w, kg water/kg dry gas
spray water 54°C
spray water 39°C
heated water
A
B B1
C
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Heat and mass transfer parameters (2)
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0
5
10
15
20
25
30
35
40
45
0 200 400 600 800 1000 1200
Part
ial p
ress
ure
p, k
Pa
Gas temperature Tg, oC
saturation pressure T = 39 oC
partial pressure in gas T = 39 oC
saturation pressure T = 54 oC
partial pressure in gas T = 54 oC
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Capacity versus DH return temperature
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0,4
0,6
0,8
1
1,2
25 30 35 40 45 50
Rela
tive
cap
acit
y
DH return temperature Tr, oC
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Conclusions (1)
Modelling results show that capacity of water heater of a
direct-contact equipment decreases, when the return
temperature of DH system increases. The correctness of
tendency is confirmed by experimental researches.
In order to carry out a detailed process analysis based on
heat and mass process descriptive equations, as well as
the correlation for wet gas parameter calculation, software
is being developed.
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Conclusions (2)
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Introduction of the 4th generation DH systems will
increase the energy efficiency of the direct-contact
equipment.
Methodology suggested in the article can be used to
assess it in each particular situation.
International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
Acknowledgment
This work has been supported by the European Social Fund project
“Involvement of Human Resources for Development of Integrated
Renewable Energy Resources Energy Production System” (project
No. 2013/0014/1DP/1.1.1.2.0/13/APIA/ VIAA/026).
IEGULDĪJUMS TAVĀ NĀKOTNĒ
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International Conference on Smart Energy Systems and
4th Generation District Heating, Copenhagen, 25-26 August 2015
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Additional information:
www.videszinatne.lv
PhD Edgars Vigants
