certus_cost_eff

EXAMPLES OF RENOVATION DESIGNS
PRODUCED IN THE PROJECT CERtuS

CITY HALL – COIMBRA PORTUGAL

BUILDING CURRENT CONDITION – TECHNICAL AND OTHER PROBLEMS DETECTED

portugal-city-hall
The building has 3 floors and 2 intermediate floors and it is oriented with an axis of 10º, with the main façade oriented to West.The external walls are made of stone masonry and have a thickness of 90 to 145 cm. All the windows and balcony doors are of single glazing with wood frames. A thermal survey made in the building showed that walls present a good thermal performance but the windows, with single glazing with wood frames, present insulation problems, aggravated by aging, contributing to high heat losses during winter.The building does not present major pathologies, such as condensations or mould growth.

ECONOMIC, FINANCIAL AND LEGISLATIVE CONSTRAINS

BRIEF DESCRIPTION
Economic/Financial Risks
The Municipality has no financial plan to improve this specific building, with the exception of the roof whose intervention was already planned. The Municipality is trying to raise funds from national and European funding programs.
Legislative Obstacles
Coimbra – part of the historic city center, older University buildings and other urban structures – is since June 22th 2013 inscribed on the World Heritage List of UNESCO. The Property inscribed is called University of Coimbra — Alta and Sofia (http://worldheritage.uc.pt/). The Coimbra Town Hall is included in this area and therefore strong restrictions are applied in the renovation of such building due to the protection rules. Therefore, it is not possible to implement any change in the building envelope able to cause any visual impact.		 The building is located in the downtown of Coimbra and it was built after the demolition of part of the old Monastery of Santa Cruz. The demolitions works and construction was carried out mainly between 1876 and 1879, but some construction works were developed gradually until the beginning of the 20th century. The building is used as the town hall of the Municipality of Coimbra, being mainly constituted by offices and storage areas.Brief video presentation: https://www.youtube.com/watch?v=IrsS95cpta4 The building usually has occupation between 7h30 and 19h30 (Monday to Friday). However, the public only have access between 9h00 and 17h00. The building has 220 employees and is visited by more than 25,000 users/year.
RENOVATION SCHEME
Building Envelope
 Regarding the insulation, the walls present a good thermal performance. The roof is to undergo an already planned renovation soon. Therefore, the improvement of the opaque envelope was not considered in the renovation plan.The windows present high thermal losses. However, since the building is part of the property “University of Coimbra — Alta and Sofia” inscribed on the World Heritage List of UNESCO several strong restrictions are applied in the renovation of such building due to the protection rules and it is not possible to implement any change in the building envelope that causes a visual impact. Therefore, it is not possible to replace the windows by double glazed windows using standard solutions, since the original frame must be maintained.
HVAC
 The HVAC system is constituted by 8 multi-split units and 21 mono-split units with a total cooling power of 273.02 kW. Most of the systems are old and are most likely to have low levels of efficiency. The replacement of mono-split systems by multi-split systems and the concentration of multi-split systems in less units was not considered, since the impact of the installation process on the building operation would be much higher. Therefore, it was always considered the replacement by systems of the same type, but with higher efficiency, keeping the same total power.
Lighting
The actual lighting system is constituted by several different types of lamps and luminaires, including fluorescent linear T8 and T5 lamps, several types of compact fluorescent lamps, incandescent lamps, halogen spots and projectors and metal halide lamps. The planned action is to replace all lamps by LEDs.
RES
Since the building is part of the property “University of Coimbra — Alta and Sofia” inscribed on the World Heritage List of UNESCO several strong restrictions are applied in the renovation of such building due to the protection rules. Therefore, the use of traditional PV panels was not considered due to its high visual impact. Therefore, it was considered the use of solar tiles, to replace the actual roof. It was considered the installation of 2,102 m2 (with the different directions of the roof) of thin film PV panels, ensuring an installed power of 126.1 kWp. This will ensure a generation of 143.3 MWh/year.

GENERAL INFORMATION
Year of construction:
1876-1879
Area/Volume:
5,880 m2 / 40,575 m3
Building Use :
City Hall / Multiple functions of public utility
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

TOWN HALL – COIMBRA PORTUGAL

RENOVATION SCHEME EVALUATION
Energy Savings
The energy consumption before the renovation, considered as baseline, is equal to 305,107 kWh/year (electricity) and the energy consumption by square meter is about 51.9 kWh/m2. After the renovation the energy consumption drops to 55,508 kWh/year (electricity only) and the energy consumption by square meter is equal to 9.4 kWh/m2. Which means 42,739 Euro/year of savings. The renovation will lead to 72.1% savings in the building.
CO2 Savings
The savings resulting from the PV system, lamp replacement and HVAC replacement by others with higher efficiency are equal to 34.92 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 72.1% of the total energy consumption.		 PARAMETERS OF THE RENOVATION SCHEME- TOTAL

Energy Savings 249,599 kWh
Costs 723,949 €
Savings 42,739 €/year
Simple Payback 16.94 years
CO2 Savings 34.92 tons/year

ECONOMIC EVALUATION

Payback Period
The project payback period is close to 17 years This payback is calculated without considering the Financing Scheme.
Total Cost
The technical investment cost is equal to 632.068 Euro (excluded VAT), which means the investment cost per square meter is 107.5 Euro/m2.
Economic Savings
The energy expenditure savings are 34,880 Euro/year

INVESTMENT FOR RENOVATION – TOTAL

INVESTMENTS €
HVAC 80,209
Lighting system (internal) 16,917
Renewable Energy – PV 534,942
Casing Building skin 0
Control system 0
Investment for Renovation 632,068

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 EPC: 25 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 26% of the whole financial source · Senior Debt is about 61% of the whole financial source · VAT Facilities is about 13%

Equity Pay Back Period
The project equity payback period is 18 years

Other considerations
In this case, the project generates enough cash flows to pay the debt but it is not able to remunerate sufficiently the capital invested by the ESCo. As a consequence, an ESCo intervention at market conditions should be considered sustainable but not profitable enough.

 coimbratownhall

INVESTMENTS (ESCOs) €
Investment for renovation 632,068
Starting liquidity 0
Interests and Banking Fees 8,927
Total Investments exc. VAT 640,995
VAT 91,881
TOTAL INVESTMENTS 732,876

 

FINANCIAL SOURCES (ESCOs) € %
Equity 192,299 26
Senior debt 448,697 61
Grant 0 0
Subsided Funds 0 0
Total Financial Sources exc. VAT 640,995 87
VAT 91,881 13
Total Financial Sources 401,959 100
supp_zanca LEARN MORE:
Link to D2.5 pdf
Link to D3.6 pdf
Link to D3.7 pdf