ICT solutions to improve the energy performance of

buildings in Bulgaria

ICT solution for heat consumption optimization

ICT solution is based on server software, communication

modules and GSM network for:

Online monitoring of heat energy consumption

Online monitoring of different parameters and working modes

Remote control of schedules

Remote optimization of service parameters

On-line preventive maintenance

Online monitoring of DHS helps for immediate detection of fault

conditions

Usually these conditions were not detected by end users because in

such situations DHS work in a service mode and buildings are over-

heated

Most common faults detected were:

Outside Temperature Sensor Fault Detection

Motor Valve Fault Detection

Pressure Sensors values outside limits

Other sensors’ values outside limits

Advantages:

• Decreasing the heat energy expenditures

• Regulating the work of the heating system in accordance with the heat consumption in the building

• Maintenance, improvement and modernization of the buildings and the building installations

• Reduction of CO2 emissions and protection of the environment

Covenant of Mayors

• It is an initiative of the European Commission involving local and regional

authorities, voluntarily committing to increasing energy efficiency and use of

renewable energy sources on their territories. By their commitment, Covenant

signatories aim to meet and exceed the European Union 20% CO2 reduction

objective by 2020.

• Sofia Municipality became part of the initiative with a decision of the Sofia

Municipality Council № 315/26.05.2011 and prepared its Sustainable Energy

Action Plan in 2013 according to which it intend to reduce the CO2 emissions with

22% up to 2020.

Sustainable Energy Action Plan of Sofia Municipality

• One of the accepted measures is:

Measure 4.1.3 – Increase of the energy efficiency of heat stations and

boilers

Situation before 2011

* For the period 2007-2011 Source: SOFENA

MWh Emissions t CO2

2007 2011 2007 2011

Coals (MWh) 0 632 0 215

Gas oil (t) 16 093 23 062 4 293 6 152

Heavy oil (t) 9 378 3 639 2 613 1 014

Natural gas (1000 m3) 10 244 11 863 2 069 2 396

Electricity (MWh) 318 802 294 383 261 099 241 100

Heat Energy (MWh) 119 324 119 468 34 604 34 646

Total 473 842 453 048 304 678 285 523

Energy Consumption of Municipality Companies and Structures

Period 2007-2011

• 90% replaced windows

• Thermal façade insulation

of more than 20

Municipal buildings

Situation and Goals

Source: Sofia Municipality Virtual Press Centre

Buildings with District Heating

Building: kWh/year kWh/m2.year kWh/m2.year

Goals

School 594 193 109 (95)

Kindergarten 290 039 156 (119,5)

Hospital 1 000 075 210 (110,3)

Administrative building 174 961 94 (89,2)

Intelligent Solutions for Energy Savings

Steps for implementation

Preliminary check and audit of the

building, DH substation and installations

Installation of equipment for on-

line monitoring and remote control

Connection to SCADA

INFOSYS

Optimization of the operational

regimes. Maintaining the

achieved results

Monthly reports and

analysis of the results

IT for energy efficiency

The solution for decreasing the sum of the heat energy bills

• 24/7 – distance centre for monitoring, control and management of heat stations in buildings

• Optimization and management of the building installations purposely to maintain the normative comfort

• On-time uncovering of fault situations

• Team for eliminating the problems

IT for energy efficiency

The solution for decreasing the sum of the heat energy bills

24/7 distance

• monitoring

• control

• management of heat stations

Scheme

• Regulation in accordance with the

consumption in the building

IT for energy efficiency

• Regulation in accordance with the External

Temperature

IT for energy efficiency

Preventive Energy Management

• Monitoring of the consumption

• Monitoring of parameter values

On-time uncovering of fault situations

• Damaged External Sensor

• Broken Regulation Mechanism

• Overheating or insufficient heating

IT energy efficiency

Giving information to the client

IT for energy efficiency

Municipal buildings

Other Buildings

•Telecommunication College

• University of Forestry

• Technical University - Sofia

• Others

Users

Buildings - Schools Region

119 СОУ „Акад. Михаил Арнаудов“ Изток

45 ЦДГ „Алиса“ Сердика

68 СОУ „Акад. Никола Обрешков“ Искър

141 ОУ „Народни Будители“ Надежда

150 ОУ „Цар Симеон Първи” Искър

133 СОУ „А.С.Пушкин“ Средец

25 ОУ „Д-р Петър Берон“ Красно Село

8 СОУ „Васил Левски“ Студентски

101 СОУ „Бачо Киро“ Надежда

3 СОУ „Марин Дринов“ Илинден

14 СОУ „Проф. д-р Асен Златаров“ Сердика

Results

Building Invoice for Heat Consumption Invoice for Heat Consumption

December 2011 December 2012

School in Sofia (new client)

( included before Dec 2012 ) 18 000 leva 10 000 leva

School in Sofia ( new client )

( included on 15 Dec 2012 ) 17 000 leva 14 000 leva

Schools – New Buildings with this system from 2012

Kindergartens – Sofia, Region Nadezjda switched to the system from March

2013 г.

Month Ext T 170 ОДЗ 90 ОДЗ 115 ОДЗ 6 ОДЗ 38 ОДЗ 137 ОДЗ Total

- ºC MWh MWh MWh MWh MWh MWh MWh

March 2012 6,48 19,879 27,900 25,384 62,379 49,800 31,050 216,3

March 2013 5,40 13,000 17,500 15,000 30,200 30,700 20,200 126,6

Difference [MWh] 89,7

Difference [leva] 8967,48

Schools

24,1 %

Kindergartens

18.6 %

Universities

29,0 %

The System for Energy Management is used in more than 50 buildings in

Bulgaria.

The expenditures for heat energy in schools, universities, kindergartens and

hostels were reduced with about 20% , without to change the heat comfort of

the inhabitants.

Analyzed Results

• 24/7 distance monitoring, control and management

• Energy efficiency management and increase of the comfort

• Correction of the settings several times per day

• Identification of the fault situations from 5 to 30 minutes after appearing

• On-time reaction and keeping the comfort of the inhabitants.

Advantages

• Consultations

• Repair of the internal installation

• Replacement of damaged or broken parts of the installation

Other Services

The introduction of Energy Management solution leads to:

• Energy savings – 15-35%

• Optimum management and optimization of the regime

• Discovering of failures and preventive maintenance

• Monitoring, control and analyses of the results

• Possibility for optimization of the working regimes of the heat supply –

District Heating Utility Company – Toplofikaciq Sofiq

Conclusion

THANK YOU FOR YOUR ATTENTION

Diana Paunova-Galeva

dpaunova@sofena.com Tel: +359 2 943 44 01

Ivo Gunev

igunev@sofena.com Tel: +359 2 943 44 01