Project summary Nine 40-year old blocks with 382 apartments have been extensively retrofitted and equipped with solar energy. The system consists of 2,850 sqm glass covered solar collectors, short-term heat storage, aquifer seasonal heat storage, heat pumps and boilers for peak demand. Originally the flats were equipped with small individual gas-fired kitchen tap water heaters. The housing corporations originally planned to install individual combined gas-fired boilers for space heating and hot water. This would however consume scarce living space. The sustainable centralized heating system appeared to be a good alternative. Both the housing corporations and the local government supported this solution and initiated a co-operative venture with a utility company. Building Type of building Number of users/dwellings, floors ca. 900 382 3 and 4 Multi family house users dwellings floors Year of construction 1963 Total effective area (heated) 26,740 m 2 Hot tap water consumption 12,600 m 3 /a, (measured/estimated) Whole energy consumption for heating purpose after CSTS implementation 2,137,000 kwh/a (Design) System engineering Year of construction of CSTS 2002 Type of collectors Flat plate collectors Thermal power 1,995 kw therm Aperture area of collectors *) 2,850 m 2 Buffer storage 9 9.5 m 3 Hot tap water storage./. m 3 Total capacity of boilers with energy source 9 38 kw + heat pump Type of hot tap water heating Centralised Type of heating system Centralised p. block Costs Total cost solar system 1,825,000 Euro Cost of CSTS / gross area of collectors 624 Euro/m 2 Subsidies 35 % John Braakman, Eneco Energie: The future for an energy utility on the long term will depend on its innovative power. We intend to stay market leader for the implementation of large scale solar thermal systems for apartment buildings. Owner Eneco Energie (system investor and ESCO) John Braakman Diakenhuisweg 39 43, Phone: +31 23 5103456 Fax: +31 23 5103457 www.eneco.nl Operator see Owner Output Output of solar heat **) 1,433,000 kwh/a Reduction of final energy ***) 4,433,000 kwh/a CO 2 -emissions avoided n. a. t CO 2 /a Solar performance guarantee *) Aperture area = light transmitting area of the front glass **) measured, between storage and piping to taps (solar system output) ***) related to the measured output mentioned before
Technical description Description of the CSTS Year of construction of CSTS 2002 Thermal power 1,995 kw therm. Gross area of collectors 2,925 m 2 Aperture area of collectors 2,850 m 2 Type of collectors Flat plate collectors Type of assembly Roof top Orientation of collectors South ( ) Inclination angle to horizon 20 Freezing protection Drain back Overheating protection Drain back Operation mode High flow Use of CSTS for Hot tap water heating, Space heating Buffer storage 9.5 m 3 per building; number of storages: 9 for each building; volume per storage: 9.5 m 3. Additionally there is an underground aquifer seasonal heat storage at 110 m depth (natural temp. 12 C, in summer time raised to 45 C); heat storage capacity 1,155 MWh Hot tap water storage./. m³ Control of backup-system/csts Shared control The surplus solar heat in summer is stored in the central aquifer storage at a temperature of 45ºC. In winter, the heat is extracted and used for preheating and as heat source for the heat pumps.
Technical description (2) Hot tap water system Type of hot water heating Centralised Recirculation system For decentralised systems:./. The installation on the consumer site Size of storage for hot tap water./. m 3 Specification: storage of hot tap water. The storage takes place in the 9.5 m 3 buffer storage and hot water is produced via a heat exchanger. Summary Nine 40-year old blocks with 382 apartments have been retrofitted and equipped with solar energy. The system consists of 2,850sqm glass covered solar collectors, short-term heat storage, aquifer seasonal heat storage, heat pumps and boilers for peak demand. The energy savings according to the design amount to 70 %. Space heating system Type of heating system Centralised per block Number of boilers 1 heat pump + 1 peak boiler p. block Total capacity (power output) of boilers 38 kw per block Capacity of each boiler and the 38 kw (2003) year of construction Energy source Natural gas Type of boiler system Condensing Type of operation Operator of the CSTS system ESCO CSTS monitoring (Output of solar heat, Total water consumption, Space heating; contribution aquifer heat storage ) Data accessible via internet Scientific monitoring & follow up Maintenance contract (ESCO) Visualisation of the solar heat output Planner Yield of CSTS plant Output of solar heat Measuring point Reduction of final energy Solar performance guarantee 1,433,000 kwh/a Design (Calculated) Between collector and storage 4,989,000 kwh/a Monitoring (Design) Heat consumption Whole energy consumption for heating 2,138,000 kwh/a purposes after CSTS implementation Estimated Energy used for Hot tap water & Space heating Whole energy consumption for heating 7,127,000 kwh/a purposes before CSTS implementation Total tap water consumption 50,300 m 3 /a Hot tap water consumption 12,600 m 3 /a, Hot tap water temperature 60 C Cold water temperature 9 15 C
Financing & Investment Introduction: Eneco Energie is investor and CSTS system owner. Eneco energie sells heat and hot water to the apartment owners. On the overall investment 35 % of grants have been received. Financing of CSTS Form of financing Purchase Distribution in percentage 35 % Costs of solar materials Total cost of solar system Detailed costs for Collectors (inluding piping, control and installation) Elevation/mounting structure (including installation) Storage/heat exchanger Backup heater Control Installation Planning/Engineering Others Safety measures for work on roof Profit and risk Perparation Bank guarantee Seasonal storage 1,825,000 Euro, excl. VAT for CSTS. Overall project costs: 5,335,000 Euro 910,000 Euro 690,000 Euro 10,000 Euro 118,000 Euro 86,000 Euro 10,000 Euro 1,800 Euro 189,000 Euro Grants: 1,856,000 EUR Tax credits:, EIA (energy investment tax deduction) Others: Avoided exploitation costs of conventional installation (net present value); paid by the housing associations to Eneco Energie: 182,000 EUR Split-up of grants: Province 1,134,000 EUR Municipality 227,000 EUR Sentervem 495,000 EUR Addresses Operation costs of heating system Power cost for pumping Maintenance cost Monitoring cost Other operaton cost Total operation cost Or: Increase of operation cost after CSTS implementation
Development & Experiences Qualitative aspects of the CSTS When buildings are integrally renovated they need to comply to the building codes for new buildings. This is a sales value for Eneco. Summary of experiences / tices to the project performance The future for an energy utility on the long term will depend on its innovative power. Innovation that s meets our social responsibility goals and enables the long-term continuity of our business. These are the drivers for developing the renewable energy market. In the past 10 years Eneco Energie realized more than 50 large scale solar thermal systems in the housing sector. An efficient organization that can initiate, implement and operate large scale solar thermal systems has been built. The 2 WM project is part of the continuous innovation process that we aim at. We intend to stay market leader for the implementation of large scale solar thermal systems in the housing sector. Experiences management Experience problems or failures? Find solutions to these problems or failures? Addresses Financial effects/project performance Project economically efficient? Fiscal or other financial effects? n. a. Effects on rental fees? Experiences technical staff Experience problems or failures? Find solutions to these problems or failures?