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5 Unitop® 50FY / units simultaneously generate 90 MW heat energy and 60 MW

trict was awarded the Client United Nations Environmental Prize in Helsinki Energy 1990 – and Helsinki Energy’s CHP and 00090 HELEN, Finland expertise has been used in Korea, China, Japan, Canada, Britain, and Russia. Helsinki is a fast growing area 3 With a population of about 560,000 Significant reduction of emissions ­inhabitants (Greater Helsinki area Helsinki Energy is a leading company Most of the heat energy in Helsinki is ­approx. 1.0 mil.), Helsinki is located for combined heat and power (CHP) produced with natural gas. The use of at the sea in the southernmost part of natural gas creates no particle or sul- Finland. In winter, ambient tempera- Helsinki Energy produces district heat phur emissions, and its carbon dioxide tures drop as low –25ºC for longer pe- effectively with combined heat and emissions are considerably lower than riods. In the summer, the climate is power production. Thus, the plants with other fossil fuels. relatively warm and temperatures rise produce both electricity and heat with The emissions from the power plants up to 25ºC or even higher. the highest possible efficiency, as op- in Helsinki have reduced significantly posed to separate electricity produc- since 1990. Dust emissions have been tion, where the heating energy gener- cut down by 89%, sulphur dioxide emis- Helsinki Energy ated as a by-product is lead to the sea sions by 82% and nitrogen oxide emis- and lost. Helsinki Energy is one of the largest sions by 72%. Emission reductions have Finnish service companies in the energy The CHP solution also offers a number been achieved mostly with combined sector. Customers are industrial and of environmental benefits, including production, use of natural gas and con- business enterprises, energy compa- lower fuel use and controlled emis- stantly refined production techniques. nies, municipalities, real estates and sions. In Helsinki, CHP use typically re- private consumers using electricity, sults in a fuel consumption efficiency District heating... district heating and district cooling. rate exceeding 90%. The move from individually heated Helsinki Energy supplies electric energy By comparison, an equivalent quantity buildings to centrally generated dis- to over 300,000 customers in different of fuel used solely for generating elec- trict heat began in the 1950s, and dis- parts of Finland. Among the services tricity would result in a maximum fuel trict heat now covers over 90% of the provided are the design, projecting consumption efficiency rate of 40–50%. city’s infrastructure. Low individual and maintenance of energy production Helsinki Energy is one of the world’s chimneys have almost vanished from and distribution systems. It produces leading CHP specialists, and Fin- the urban landscape. and supplies district cooling energy land one of the leading countries in The reliability of the district heating and provides IT services to business this field. Helsinki’s CHP-based dis- network is very high in Helsinki. It is buildings. With annual district heating sales exceeding 6,000 GWh and serv- ing 13,000 customer premises, most of which are residential buildings, Helsinki Energy is the largest energy company in Finland producing, distrib- uting and selling district heat. 4

designed with loops allowing distribu- The chilled water is distributed via the Katri Vala combined district heating tion to customers via several alterna- underground district cooling network and district cooling plant tive routes, if required. Looped net- to office and business buildings con- In a rock cavern excavated beneath works increase distribution reliability nected in the district of Ruoholahti. the Katri Vala Park in the Sörnäinen considerably. Since the year 2002, district cooling district of Helsinki, the heat-pump has been supplied to office buildings The operation of Helsinki Energy’s plant is generating district heat of in the district of Hermanni and Vallila. district heating network is constantly 88ºC and simultaneously chilled water Transportable cooling units produce monitored, limiting interruptions to a with a temperature of 4ºC for district the required cooling energy until a minimum. cooling purposes.

...and district cooling Since the late 1990s, Helsinki Energy is also constantly developing its district cooling system. One of the main reasons for the grow- ing popularity of district cooling is seen in the increased concentration on core business activities of companies and subsequent outsourcing of building services. Another reason for the grow- ing popularity of the service is its en- 5 6 vironmental friendliness and cost-ef- fectiveness compared to conventional technology with local installed small cooling plant and corresponding distri- Excavation work for the installation units. bution network for district cooling are started in summer 2004 and the plant From Helsinki Energy’s point of view, constructed in the area. has been in commercial operation district cooling also enhances the en- since autumn 2006. ergy efficiency of CHP production even Energy distribution tunnels The Katri Vala installation is connected further. Along with electricity and dis- Helsinki Energy operates close to 30 km to the Suvilahti seawater pumping trict heat sales, district cooling consti- of multi-utility tunnels excavated in ­station via a 600 m long multi-utility tutes a new form of energy service. bedrock. They contain water-, district tunnel. heating- and district cooling pipelines, “First, the seawater pumping station Development of district cooling electric cables up to 110 kV as well as will only serve the Katri Vala heat- electric and telecommunication cables The capacity of the first district cool- pump plant. By 2020, the pumping sta- for domestic purposes. The size of the ing plant located at the Salmisaari tion will also serve the future Suvilahti tunnels allows travelling by car. power plant is 10 MW. It consists of and Pasila district cooling plants” says two absorption and a 1,000 m3 Due to the growing demand, Helsinki Mr Veijo Noponen, who is a process chilled water storage tank to cope with Energy has increased its district cool- designer and installation supervisor at peak loads. Between the years ing production capacity significantly Helen Engineering, a business unit of 2002-2006 another district cooling with the new Katri Vala installation. Helsinki Energy. plant was built in the Salmisaari power A distribution network is built to con- plant area. The total capacity of this nect the city centre of Helsinki and the plant is 28 MW. district of Sörnäinen to the new plant. 4 7 8 9

“In winter, the energy for district heat- Uniturbo® 50FY with inte- environments. Each Unitop® 50FY heat ing is extracted from treated domestic grated lube- and seal oil systems, all pump is equipped with its own PLC, sewage flowing through the factory assembled, completely piped touch screen, and is connected to the of the heat pumps, downstream of the and wired up and delivered to site as a field components like pressure- and Viikki sewage works and cold sea­water single lift package. The high-efficiency temperature sensors, actuators, elec- is used for producing district cooling package is also pre- tric motors, contactors and switches. in free-cooling mode. In summer, the assembled in the works. It consists of The control and logic system is de- heat pumps produce heat continuously , condenser, subcooler and signed for fully automatic operation also in cooling mode. While the chilled intermediate pressure vessel. Disman- of the heat pump plant. For remote operation, a link is provided via Mode- bus to Helsinki energy’s main control room where operators monitor Helsin- ki’s whole district heating and district cooling networks.

Flexibility for high energy efficiency Unitop® 50FY chillers offer all imagi- nable flexibility regarding use of heat sources. Picture no. 12 shows the inte- gration of the Unitop® 50FY heat pump at Katri Vala. 10 11 Winter operation The temperature of the sewage is water is completely absorbed by the tled again, the package is supplied to higher than the seawater temperature, district cooling system, the surplus site in various parts of still impressive resulting in a favourable COP of the heat energy is discharged into the sea size. heat pump. (Valves B, C+ D open, Valve water”, explains Mr. Noponen. A closed). The district heating water Enhanced finned tubes of the latest de- is preheated only by the heat pump to New 10,000 m3 chilled water storage sign are used for optimal 62°C, thus further enhancing the overall facilities connected to the multi-util- and highest performance of the heat COP. The heat energy generated is com- ity tunnels are planned in the city exchangers. Materials are selected to pletely absorbed by the district heating centre. They are charged during the perfectly match the requirements of network, while the district cooling de- night when cooling energy sales are the heat transfer fluids. mand is covered by using cold seawater generally lower. The energy stored is in “” mode. (Valves G open, used during the next day at peak load Advanced plant control system valves E, F + H closed). hours. The storage process enables the operation of the heat pumps at maxi- The control and logic system is based Summer operation mum efficiency. on the latest Siemens PLC equipment There is a considerably smaller demand designed especially for use in industrial of heat energy during the warm season.

Five Unitop® 50FY heat pumps The Katri Vala installation comprises five electric-driven Unitop® 50FY heat pumps leaving space for a sixth unit. Each heat pump consists of the 12

Thus, the Unitop® 50FY heat pumps are 3 The only smoking chimneys on a cold Technical data: able to produce the full temperature winter day are the ones of the Helsinki ® Energy’s power plants. They cover more lift required. The chilled water pro- 5 Heat Pump Unitop 50FY, each than 90 percent of the heat demand of duced is absorbed completely by the the capital city with district heat Winter operation: district cooling system. During times 4 A Unitop® 50FY heat pump unit at right, Heating capacity 16,770 kW without heat load, the condensing with district heating pumps and piping Heating water flow 1,221 m3/h in the centre, towards the end of erec- temperature is lowered to match with Inlet/outlet temperature 50/62 °C tion. sea water conditions and the heating Power absorbed 4,770 kW 5 Helsinki Energy is developing its net- energy is rejected to the sea, resulting works for district heating and district Electric motor 6,500 kW in a very high COP. (Valves A + H open, cooling at great speed to match with Voltage 11 kV the increasing demand. Valve B + C closed, Valves E + F open, Heat source (cooling) capacity 12,000 kW 6 The Katri Vala park is located between Valves D + G closed). Sewage in/out temp. 10/4 °C the city center and the harbour area with the Hanasaari power station. Main features of the Unitop® 50FY Summer operation: 7 Main entrance door to the district hea- ting / cooling plant located below the • Open-type two stage compressor Heating capacity 18,113 kW 3 Katri Vala park. • : halocarbon/hydrocarbon Heating water flow 370 m /h Inlet/outlet temperature 45/88 °C 8 One of the three service tunnels of the • Tough industrial design with vertically Katri Vala plant. Each Unitop® 50FY is split casing for easy maintenance Power absorbed 6,113 kW placed in a cavern, isolated from the other units. • Suited for all drive systems Electric motor 6,500 kW Voltage 11 kV 9 Operating staff member next to a Uni- • High efficiency across the entire top® 50FY heat pump unit. Right: Com- operating range Heat source (cooling) capacity 12,000 kW pressor and motor; centre: the seal oil • Operating temperatures –40°C/+90°C District cooling in/out temp. 20/4 °C package; back: the heat exchangers. • Operation in series or in parallel 10 3D-view of the Unitop® 50FY. Left: motor, gear, compressor and oil system. • Large capacity, small floor space Right: the heat exchanger package. 11 Sample screen of the touch panel with Service and maintenance user friendly setup of the control system Legend for each Unitop® 50FY heat pump unit. Specialists of Helsinki Energy are main- 1 View of the harbour area and the city taining the Unitop® 50FY heat pump centre of Helsinki. 12 Simplified functional diagram of the ­Katri Vala district heating / district during normal operation. Under a spe- 2 The Hanasaari combined heat and power cooling systems, utilising sewage and cial agreement, Friotherm carries out plant. The Suvilahti seawater pumping sea water as heat sources. station is located in the flat roofed the regular service works on the five brick building on the left. heat pumps.

Friotherm AG Zürcherstrasse 12 · P.O.Box 414 CH-8400 Winterthur · Switzerland Tel. +41 (0) 52 2 62-80 80 · Fax -00 03 E-Mail [email protected] Internet www.friotherm.com

E012-07 Subject to technical change