Dušan Petráš ENERGY AUDITING AND CERTIFICATION OF BUILDINGS IN SLOVAK REPUBLIC Slovak University of Technology in Bratislava, Faculty of Civil Engineering, Slovakia PROJECT ENHANCE

To promote the improvement of the energy performance of buildings through cost effective measures (new and existing buildings) The Directive require the following to be introduced: Methodology for calculating the energy performance of buildings (EN ISO 13790); Application of performance standards for new and existing buildings; Certification schemes for buildings; Regular inspection and assessment of boilers, heating systems and air conditioning systems Objective: To prepare “Certificate” and identify “Cost effective measures”  Energy Auditing (Directive 2006/32 EC, EN 15217) EU Directive on the Energy Performance of Buildings

Energy Performance and Energy Requirements Energy Performance: overall indicator EP = weighted sum of net delivered energy per energy carrier (per m 2 conditioned area). EP may represent: Primary energy; CO 2 emissions; Net delivered energy weighted by any other nationally defined parameters EP may be completed by other indications, defined by national bodies. Energy Requirements: minimum level of EP to be achieved. To ways of expressing the energy requirements EP r : 1.Overall EP requirement 2.Specific requirements:  Energy use for heating, ventilation, DHW, cooling and lighting  Energy need for heating, ventilation, DHW, cooling  Characteristics of the building itself or its technical building systems considered as a whole  Characteristics of the building itself or its technical building systems components New buildings and major renovations: one overall EP requirement shall be included

Standard Building geometry Actual/standard Climate Actual Use Actual Tech. systems Certificate EE Measures InvestmentNet savingsPB [euro][euro/yr][year] 1. Energy efficient showers ,9 2. Automatic control system ,6 3. O&M / EM ,0 4. Heat recovery, ventilation ,5 5. Thermostatic radiator valv ,4 6. Insulation of pipes, valves ,8 7. Insulation of roof ,4 Profitable measures ,0 Energy Auditing of Buildings Climate Use Tech. systems

Software for Auditing/Certification

Software results – existing situation Budget itemExisting situation Global indicator [kWh/m² a] Heating94,395,4 Ventilation11,411,8 Domestic hot water14,514,6 Fans (ventilation)9,4 Pumps, heating1,1 Incl. in heating Pumps, ventilation0,4 Incl. in ventilation Pumps, DHW0,1 Incl. in DHW Pumps, cooling0- Lighting30,1 Various8,8- Cooling0- Total170,1161,3 Global indicator - heating

Primary energy and CO2 emissions

Results – after EE measures Budget itemAfter measures Global indicator [kWh/m² a] Heating 33,534,6 Ventilation8,89,2 Domestic hot water12,913,0 Fans (ventilation)9,4 Pumps, heating1,1 Incl. in heating Pumps, ventilation0,4 Incl. in ventilation Pumps, DHW0,1 Incl. in DHW Pumps, cooling0- Lighting15,0 Various8,8- Cooling0- Total 90,0 81,2 Global indicator - heating

ENergy CONservation (ENCON) : is saving energy with an economic and environmental profit ! Energy Conservation ?

Energy Conservation Project Objectives : Evaluation of the ENCON potential Implementation in order to achieve profitable energy savings Achievement of calculated energy saving potential and keeping it permanently on the right level Evaluation of the ENCON potential Implementation in order to achieve profitable energy savings Achievement of calculated energy saving potential and keeping it permanently on the right level

Detailed Auditing with guarantee Simplified Auditing Operation Implementation Scanning Project Identification ENCON Potential USD, kWh/year Profit Training Maintenance Project Management Energy Monitoring Business Planning The ENCON Process

What is influencing the Energy Conservation Potential ? Electrical systems Operation / user pattern HVAC systems Building envelope

EAS v1.0 Quick and easy handling application based on European standard The database contains: 42 apartment buildings (most built) 8 typical single family houses Countable in two climatic zones (-12°C and -18°C) Structure of EAS v1.0: 1. Photo documentation 2. Drawing documentation 3. Building description 4. Energy – economy calculation 5. Grafical presentation 6. What is an energy audit...

1. Photo documentation View on the selected type of building Identification of the building 2. Drawing documentation Technical recods (ground-plan, typical floor,...) Necessary dimensions (calculation of heated areas,...) Description of BE, HS, HW EAS v1.0 - structure

3. Energy – economy calculation Calculations of: Energy savings Investments Profitability Calculate measures individually (depends on the customer) Three basic domains of energy measures: Heating System Building Envelope EAS v1.0 - structure Hot Water

Table 1 Energy saving measurements of Building Envelope Table 2 Energy saving measurements of Heating System Table 3 Energy saving measurements of Hot Water Three basic domains of energy measures

Table 4 Energy potential for individual energy saving measures* Input values: Cost of GJ heat or m3 of natural gas Calculation of the whole building vs. just one flat Investments for the profitability calculations are running behind and they contains from costs of: Investment Cost of supply Design work Installation Test (running, pressure,…) Taxes (VAT) Energy potencial

Energy savings:  Building Envelope (blue)  Heating System (green)  Hot Water (red) Energy consumption before / after Contribution percentage of each profession 4. Graphical presentation

 Panel buildings are dominant type of residential buildings  Energy performance of buildings - HEATING  110 ~ 140 kWh / m 2 ( E –F )  40 ~ 80 kWh / m 2 (B –C ) Do not comply with current requirements on thermal protection and energy efficiency High energy consumption, poor insulation, leaky constructions (envelope, roof) thermal discomfort CASE STUDY in SLOVAKIA

To clarify the relationship between energy consumption, energy efficiency measures and the indoor environment To study occupant´s behavior and habits To show results at three time points: A) Before renovation B) After renovation with no-balanced heating system C) After complex renovation Objective of the case study

Description- general Prefabricate building built in NP : 1.NP – common premises, storage space NP – residential 32 apartments The Facade Windows, doors

Heating system and DHW Heat sources- Heat exchange station Distribution - Instalation space - Instalation shafts Description- building services

Insulation of the roof Energy efficient measures Insulation of the facade New windows, doors Hydraulic balance of the heating system Installation of saving shower heads

Energy consumption of heating system Year Energy consumption* real measured values [kWh] Energy consumption* values from simulation program [kWh] % YEAR 2009  Hydraulic balance of the heating system Table: Comparison of energy consumption in each year 51 % YEAR 2008  Insulation of the facade  New window, doors  Insulation of the roof YEAR 2007  Original conditions After renovation with no-balanced heating system : After complex renovation:Before renovation : D 106 kWh/m 2 72 kWh/m 2 C 35 kWh/m 2 B

Energy certification Heating system BEFORE: 106AFTER: 35 Domestic Hot Water system BEFORE : 41AFTER: 30 GLOBAL INDICATOR BEFORE : 147AFTER: 65 EB DC DB

Energy Auditing and Certification of Buildings THANK YOU FOR ATTENTION ! Contact:

THANK YOU FOR ATTENTION ! Contact: