CENTRALISED HEAT
DISTRIBUTION SYSTEM RECONSTRUCTION
Vimperk, Czech Republic
DESCRIPTION OF THE PROJECT
Partnership process
The current state of
heat management in Vimperk town provides one of the most advanced
heating systems in South Bohemia. The project was co-financed by
the State Environmental Fund. SEVEn, The Energy Efficiency Center,
prepared the technical solution in cooperation with the company
K-projekt from Dačice. The project was implemented by
Kotlemont Praha in cooperation with EVČ Pardubice (design
documentation, transmission station) and Johnson - Controls
(measuring and regulation).
Technical data
Fuel and power flows within the Central centralized heat
distribution system are displayed on the Sankey´s diagram
before and after the upgrade.
CONTEXT
Two central heating
distribution systems were gradually established in Vimperk. These
are two island systems without interconnection. The centralized
heat distribution system in Vimperk is the main heat supplier for
space heating and water heating mainly in locations with newer
concrete apartment blocks, older brick houses and also provides
public infrastructure for other heat consumers.
At the end of 2005 the town implemented substantial reconstruction
of the Central centralized heat distribution system.
Glass Factory centralized heat distribution system
The boiler station supplies heat within insulated small heat
distribution system for concrete apartment blocks with 424
apartments and the public infrastructure of K. Weise´s blocks
of apartments.
Two of the boilers are part of the independent steam system
established for glass factory operation - which is currently out of
operation.
Originally low pressure coal-fired steam boiler station was partly
upgraded in 1995 for use of natural gas and equipped with three
identical warm water boilers - Průmyslovesta Brno, type HVP
1500, with unit output of 1,5.MWtep. Annually the boiler station
supplies heat for space heating and water heating (app. 16.000 GJ)
to small concrete blocks of apartments with 424 apartments and to
the public infrastructure. Originally the boiler station has been
equipped with two low pressure steam boilers for the glass factory
technology. These boilers are currently out of operation since the
glass factory is out of business. The annual natural gas
consumption is app. 470 - 500 thousands of m3.
The distribution network from the Glass Factory boiler station is a
warm-water line of four pipe type. Warm water routes length is 775
m, length of the inlet utility warm water inlet line is also 775
m.
INNOVATIVE PRACTICE
Central centralized heat distribution system
The source was established in 1978 as a medium pressure brown coal
fired steam source. It serves for heat supply to concrete and older
blocks of apartments with 1.530 apartments, including public
infrastructure. In 1998 medium pressure natural gas fired steam
boiler has been installed, but it is has not been operated. The
total installed output of the source was 13.5 MW.
The primary steam
distribution within the centralized heat distribution system
supplied in total seven heat exchange stations, from which four of
them supplied heat to secondary heat distribution systems for
residential houses, including central utility water heating and
three stations were located directly in specific buildings (school,
Český Telecom and Health Centre). The exchange stations
were not suitable from the technical and economical point of view.
The secondary distribution system was of four pipes type.
Reconstruction of the centralized heat distribution system was
implemented in the summer 2004. The original central boiler station
was cancelled and new condensation gas boiler station was installed
in the original heat exchange station at Rokle. The boiler station
includes three Viessmann gas boilers with power output 3.1 MW and
Weisshaupt single unit burners. Two boilers are equipped with
condensation heat exchangers with maximum output of 0.35 MW. The
total installed output of the warm-water gas boilers including flue
gas exchanger varies between 9.3 - 9.8 MW. In addition the boiler
station also includes TEDOM 22 kWel, 44 kWt cogeneration unit (for
own power consumption in the boiler station). The heat generation
efficiency during the year is about 95 %.
The original four pipes lines were replaced with double pile
distribution lines 95/65°C. Unit heat transmission station
with heating water regulation and decentralized utility warm water
preparation were installed directly in the individual supplied
buildings. The boiler station operation as well as of the entire
centralized heat distribution system is controlled by Johnson -
Controls system.
LESSONS LEARNT & APPLICABILITY IN OTHER SITUATIONS
COST AND BENEFITS
Economical
The town heating management upgrade has been implemented on the
basis of technical documentation prepared by SEVEn and K - projekt
Dačice. The upgrade was implemented during the summer months
of 2004. The new system has been in operation since the 2004/2005
heating season. The total project implementation costs totaled CZK
66,789.5 thousands, from that the subsidy from SFŽP was CZK
28,159.6 thous..
The total savings including fuel and energy costs, wages, service
and maintenance as well as other services, air pollution fees etc.,
present CZK 3.175 mil. a year. The investment return is 12.7
years.
Environmental
The basic pollutants emission was reduced by 94% and CO2 emissions
by 84%. This significant reduction of basic pollutants and CO2
emissions results from the change of the fuel type - transmission
from brown coal to natural gas, installation of high efficiency
heat generation equipment, installation of cogeneration unit and
reconstruction of distribution lines - it all significantly reduced
loss from distribution.
CONTACT DETAILS
Lenka Pavlátková
THE REGION OF SOUTH BOHEMIA - PERMANENT OFFICE
Avenue d´Auderghem 84
B-1040 Bruxelles
Tel/Fax: +32 2 512 96 13
IP Tel: +420 386 720 573
lenka.pavlatkova@southbohemia.eu
