certus_cost_eff

EXAMPLES OF RENOVATION DESIGNS
PRODUCED IN THE PROJECT CERtuS

ELEMENTARY SCHOOL OF SOLUM – COIMBRA PORTUGAL

BUILDING CURRENT CONDITION – TECHNICAL AND OTHER PROBLEMS DETECTED

portugal-school-of-solum

The orientation of the building is optimal, being along an east–west axis with the main façade in the north. The back façade is oriented to south and has the existing PV system. The external walls are made of breeze blocks and bricks and have a thickness of 55 to 60 cm in the 2 blocks and of 35 to 55 cm in the refectory. All window have aluminum frames providing good leak tightness, with the exception of 2 windows, which have a wooden frame. All the windows are double glazed with the exception of 4 windows. Also the windows directed to west and south have interior shutters. Some shading is also ensured by other building (south façade) and trees (south, east and west). The main entrance doors of the 2 blocks are not airtight and present unintentional infiltration of air into the building. However, the circulation areas do not have any HVAC source. The building does not present relevant pathologies.
ECONOMIC, FINANCIAL AND LEGISLATIVE CONSTRAINS BRIEF DESCRIPTION
Economic/Financial Risks
The Municipality has no financial plan to improve this specific building. The Municipality is trying to raise funds from national and European funding programs.
Legislative Obstacles
There are no major legislative obstacles to the renovation of this building.
The Elementary School of Solum (Escola Básica do 1º Ciclo da Solum) was built in the 1950s. Until the 1970s this was an annex school to the teacher training colleges dedicated to pedagogical training. In the 1990s it was converted into an Elementary School. The construction of refectory and a partial renovation of the building was done 10 years ago.The building is located in the East side of the city, near to the Stadium and a commercial area.The school is constituted by 2 buildings with 39.8 x 9.5m each and 1 building (refectory) with 2 areas of 9.73 x 6.5 m and one of 7.15 x 2.15 m. The largest buildings have two floors and the refectory building only one floor.The school has about 300 students.The schedule of the daily activities (Monday to Friday) is:– Classes – 9h00 to 12h30 and 14h00 to 16h00– Lunch – 12h30 to 14h00– Extra-curricular activities – 16h30 to 17h30– Family support – 7h30 to 9h00 and 17h30 to 19h00

RENOVATION SCHEME

Building Envelope
The renovation of the building envelope was not considered in the renovation scheme. The building was recently renovated and therefore the opaque envelope does not present major problems. Additionally, since the building does not have any centralized HVAC system the improvement of the envelope would not lead to a major reduction of energy consumption in heating and cooling. Therefore, the improvement of the opaque envelope was not considered in the renovation plan.
HVAC
The building only has central heating in the refectory. The other areas of the building do not have central heating, being the heating in the classrooms ensured by one oil-filled radiator during the coldest days. However, the option to replace such oil-filled radiators by heat pumps is not effective. In the refectory it was considered the replacement of the existing gas boiler by a heat pump.
Lighting
The actual lighting system is mainly constituted by fluorescent linear T8 lamps with electromagnetic ballast. The planned action is to replace all T8 lamps with electromagnetic ballast by T5 lamps with electronic ballast.
RES
The buildings already has a small PV systems (18 modules). It is planned to increase the PV system to 72 PV panels, ensuring an installed power of 16.92 kWp. This will ensure a generation of 23.32 MWh/year.
Other
ICT and other appliances (mainly PCs, monitors and printers) do not represent individually a large share of energy consumption and therefore the achieved savings with such appliances would not have a major impact on the total energy consumption. The replacement of such appliances by new devices is not cost-effective just from the energy savings point of view and therefore this is not considered in the renovation plan. However, in the regular replacement of ICT appliances it is recommended to install just ICT appliances with lower energy consumption.

GENERAL INFORMATION

Year of construction:
Built in the 1950s
Area/Volume:
1,655 m2/6,269.21m3
Building Use :
Elementary school
supp_zanca LEARN MORE:
Link to D2.1 pdf

Link to D2.3 pdf
Link to Guide or Brochure
certus_cost_eff

EXAMPLES OF RENOVATION DESIGNS
PRODUCED IN THE PROJECT CERtuS

ELEMENTARY SCHOOL OF SOLUM – COIMBRA PORTUGAL

RENOVATION SCHEME EVALUATION

Energy Savings
The energy consumption before the renovation is equal to 39,291 kWh/year (electricity and natural gas) and the energy consumption by square meter is equal to 23.74 kWh/m2. After the renovation the energy consumption drops to 928 kWh/year (electricity only, gas is not used after the renovation) and the energy consumption by square meter is equal to 0.56 kWh/m2. Which means an energy expenditure saving of 5,082 Euro/year. The renovation will lead to 97.6% savings in the building.
CO2 Savings
The savings resulting from the expansion of the PV system, lamp and ballast replacement and gas boiler replacement are equal to 5.54 tons/year.
RES Integration
In the evaluation of the PV generation it was considered the self-consumption of 90% of the energy. RES will ensure 96.2% of the total energy consumption.
PARAMETERS OF THE RENOVATION SCHEME- TOTAL

Energy Savings 32,191 kWh
Costs 31,469 €
Savings 5,082 €/year
Simple Payback 6.19 years
CO2 Savings 5.54 tons/year

ECONOMIC EVALUATION

Payback Period
The project payback period is 6.19 years.Total Cost
The total investment cost is equal to 31,469 Euro, which means the investment cost per square meter is 19.12 Euro/m2.


Economic Savings
The energy expenditure saving is 5,082 Euro/year.

INVESTMENT FOR RENOVATION – TOTAL

INVESTMENTS
HVAC 6,556
Lighting system (internal) 2,920
Renewable Energy – PV 21,993
Casing Building skin 0
Control system 0
Investment for Renovation 31,649

FINANCING SCHEME

Energy Performance Contract
On the basis of Deliverable D3.5 the implementation of the “shared savings” EPC contract (considered to be the most widespread among the four CERtuS countries) was chosen. The ESCo is supposed to invest through a Special Purpose Vehicle (SPV).

Duration of EPC
Duration of the EPC: 15 years

Financial Sources
Given the Renovation Scheme selected and the characteristic of the project, ESCo involvement is possible at current market conditions but it needs a mix of source of finance, in particular the use of Subsides Funds:Equity is about 33% of the whole financial sourceSenior Debt is about 22% of the whole financial sourceSubsided Funds 31%VAT Facilities is about 14%

Equity Pay Back Period
The project equity payback period is 14 years.

Other considerations
With this financial structure, an ESCo intervention is possible and the remuneration of the invested capital, in terms of IRR, should be considered adequate for this kind of projects.

elementaryschoolofsolum-coimbra

INVESTMENTS (ESCOs)
Investment for renovation 27,167
Starting liquidity 0
Interests and Banking Fees 384
Total Investments exc. VAT 27,551
VAT 4,302
TOTAL INVESTMENTS 31,853

 

FINANCIAL SOURCES (ESCOs) %
Equity 10,447 33
Senior debt 6,964 22
Grant 0 0
Subsided Funds 9,900 31
Total Financial Sources exc. VAT 27,311 86
VAT 4,302 14
Total Financial Sources 31,613 100
supp_zanca LEARN MORE:
Link to D2.5 pdf

Link to D3.6 pdf

Link to D3.7 pdf