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APEC 2007/1/291 District Heating and Cooling through the Utilization of Untapped Energy Sources Tokyo Toshi Service Co., Ltd. (TTS)

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Presentation on theme: "APEC 2007/1/291 District Heating and Cooling through the Utilization of Untapped Energy Sources Tokyo Toshi Service Co., Ltd. (TTS)"— Presentation transcript:

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2 APEC 2007/1/291 District Heating and Cooling through the Utilization of Untapped Energy Sources Tokyo Toshi Service Co., Ltd. (TTS)

3 APEC 2007/1/292 Heat Supply Status (as of the end of FY2005) Heat suppliers Heat supplied region all areas Total floor area Heat sales volume Heating capacity Cooling capacity Water thermal storage tank Ice thermal storage tank ( 1000 ㎡) ( 1000GJ )( GJ/hr ) (m 3 ) 3 ) Nationwide ,05347,01525,07215,82013,655265,88522,627 TTS 1161,8193,3381, , (Source: Heat supply project booklet 2006) (Note: TTS operates in 17 regions + one region that is not subject to the Heat Supply Business Law) Heat supplied regions

4 APEC 2007/1/293 Untapped Energy Sources (as of the end of FY2005) Classification Untapped energy sources NationwideTTS Waste incineration/plant 80 Urban Subways 20 waste Substations/transformers 105 heat Waste/reclaimed oil 30 Power plant extraction steam 20 Recycled wastewater/sewage 6(1)6(1) 1 River water 4(1)4(1) 1 Sea water40 Natural energy sources Groundwater 2(1)2(1) 1 Total 41 ( 3 ) 8 (Source: Heat supply project booklet 2006) Figures in ( ): regions adopting other energy sources

5 APEC 2007/1/294 TTS Monthly Heat Sales Results (FY2005) 0 50, , , , ,000 April May June July August September October November December January February March GJ Cold water for air-conditioning Hot water for air-conditioning Hot water supply Annual heat sales (17 regions): 1.39 million GJ products ・ Cold water: 79% ・ Hot water: 19% ・ Hot water supply: 2%

6 APEC 2007/1/295 Features and Effectiveness of TTS System Introduced in 17 regions Treated sewage effluent, river water, underground water, substation waste heat: utilized in 8 regions (Air-conditioning waste heat: utilized in 17 regions) + + Heat pump Thermal storage Untapped energy sources

7 APEC 2007/1/296 Effectiveness of Heat Recovery Pump ( Recovery of air-conditioning waste heat, one form of untapped energy) Air-conditioning waste heat is recovered (heat recycling) from autumn to spring, enabling extensive energy conservation COP: Electric power input= 1 Cold water generation = 3.5 Hot water generation = 4.0 (Simultaneous production of cold/warm heat ) Electric power Heat pump Cold water storage tank Hot water storage tank Heat exchanger During thermal storage

8 APEC 2007/1/297 Heat Pump Operation (during summer) Energy (electric power): 1 Heat energy: 5 Cold water Heat energy: 6 Sewage effluent Heat exchanger (condenser) Compressor Pressure Heat exchanger (vaporizer) Heat intake Reduced pressure Motor

9 APEC 2007/1/298 Thermal Storage Tanks Heat pump ■ Mechanism ■ Thermal storage ■ Effectiveness ● Improvement of energy utilization efficiency by continuous rating operation ● Downsizing of heat pump capacity: ・ Downsizing from A to B ・ Requires less space for the control/ operations room ① Store ice, cold/hot water at night ② Release heat during day in accordance with the variations of air-conditioning loads ③ Heat shortages offset by heat pump Time Load During thermal storage Cold water storage tank Hot water storage tank 22 Thermal Storage tank & Distributor

10 APEC 2007/1/299 Multifunction Storage Tanks ( “ community tanks ” ) Special uses: ・ Toilet flushing water ・ Domestic water: laundry/washing Emergency use: ・ Fire fighting Regular use : ・ Cold/hot water for air-conditioning

11 APEC 2007/1/2910 Untapped Energy Sources: Characteristics and Issues Resolution: combination of a heat pump and a storage tank Treated sewage effluent ○○ River water○○ Sea water○○ Recycled wastewater ○○ Industrial water ○○ Availability Available heat variations Untapped energy sources Low Moderat e High Moderate Low ■ Characteristics (Excluding high-temperature exhaust heat from incineration plants, etc.) ■ Utilization issues ● ・ Difficult to match availability of untapped energy source with user demand ● Timin g ● ・ Long distance between untapped energy sources and users Location Temperatur e ・ Insufficient heat level of untapped energy sources often make the utilization by users difficult.

12 APEC 2007/1/2911 Project example: Heat Supply by Treated Sewage Effluent Heat Utilization

13 APEC 2007/1/2912 Project example: Heat Supplied Areas ● Heat supplied areas ● Supplied floor areas ● Plant location ● Heat supply system Part of Hibino 1 and 2 and Nakase 1 and 2, Mihama-ku, Chiba-shi, Chiba Pref. 48.9ha Nakase 1-3 G, Mihama-ku, Chiba-shi, Chiba Pref. Plant total areas: 3,124 ㎡ Storage heat pump, utilizing electric power at night (heat source: treated sewage) Higashi Kanto highway Central plant 2 nd plant (planned) Supplied area Distribution pipes Heat source water pipes Users Seiko Instruments Inc. Canon Inc. Sumitomo Chemical Engineering Co., Ltd. IBM Japan Robot FA SHARP FUJITSU Aeon Co., Ltd. KITS Tokio Marine & Nichido Fire Insurance Co., Ltd. Hotel Springs Makuhari Annex Makuhari Kaihin Park Messe Mall Kaihin Makuhari Station JR Keiyo Line Makuhari Techno Garden Inbanuma sewage treatment pond to Hanami river terminal water treatment plant Inbanuma sewage treatment pond to Hanami river 2 nd terminal water treatment plant Operations began April 1991

14 APEC 2007/1/2913 Project example: Central Plant System ( Summer time ) Hot water storage tank Cold water storage tank Users To the second plant (in the future) Heat exchanger 750RT Heat exchanger 1500RT Heat exchangers 1800RT×4 Low heat exchanger Cooling tower Turbo refrigerator Heat source (treated sewage effluent ) HP: water heat source heat pump DB: double band heat recovery pump

15 APEC 2007/1/2914 Project example: Principal Equipment Refrigerator UnitCapacity/# of units Heat medium Temperature Pressure Principal equipment at the central plant Cold water (temp. at time supplied ) Hot water (temp. at time supplied ) Cooling RT Heating MJ Cooling RT Heating MJ Cooling RT Heat sources Storage tanks Heat recovery pump Treated sewage effluent heat pump Total cold heat Total heat Cold water tank Hot water tank Hot/cold water tank Storage tank total

16 APEC 2007/1/2915 Project example: Treated Sewage Effluent Temperature Cold water: 5 ℃ Hot water: 48 ℃ Maximum OATMinimum OATSewage effluent Apr.MayJun.Jul.Aug.Sept.Oct.Nov. Dec. Jan. Feb. Mar 4月5月6月7月8月9月10月 ℃ o Stable temperature throughout the year compared to outside air o Effective as heat source for a heat pump due to lower temp. than OAT in summer/higher temp. in winter. Maximum OATMinimum OATSewage avg. temp. Apr.MayJun.Jul.Aug.Sept.Oct.Nov. Dec. Jan. Feb. Mar. Hot water: 48 ℃ Cold water: 5 ℃

17 APEC 2007/1/2916 Project example: Effectiveness of the Utilization of Untapped Energy Sources Sewage effluent HP (cold water) Air heat HP (cold water) Sewage effluent HP (hot water) Air heat HP (hot water) Heat pump coefficient of performance (COP) Aug. 2004/Jan. 2005) Average temp. (℃) COP Sewage effluent HP (cold water) Air heat HP (cold water) Sewage effluent HP (hot water) Air heat HP (hot water)

18 APEC 2007/1/2917 Project example: Effectiveness of the Utilization of Untapped Energy Sources

19 APEC 2007/1/2918 Project example: Heat Generation Ratio by Pump Type (2004) Dependency on sewage effluent heat: 63% Sewage effluent HP (cold water) Sewage effluent HP (hot water) Turbo HP (cold water) Heat recovery pump (cold water) Heat recovery pump (hot water)

20 APEC 2007/1/2919 Project example: Effectiveness of the Utilization of Untapped Energy Sources Note: COP = heat sales (GJ)/ total plant energy input (GJ) Cold water Hot water Hot water supply (steam) COP Apr.MayJun.Jul.Aug.Sept.Oct.Nov.Dec.Jan.Feb.Mar.

21 APEC 2007/1/2920 Notes: ・ Combustion method: boiler + absorption chiller ・ Primary energy basic unit (electric power): 9760kJ/kWh ・ CO 2 emission basic unit: electric power: 0.381kg/kWh gas: 2.362kg/m 3 Project example: Effectiveness of Utilization of Untapped Energy Sources ■ Reduction effects Combustion Air heat pump Energy conservation 38%13% Reduction of CO 2 47%13% Water conservation ~ 230,000m 3 ~ 120,000m 3

22 APEC 2007/1/2921 Total Energy Efficiency in Domestic Heat Supplied Areas (FY2005) Total energy efficiency Air-conditioning by electric power (thermal storage) 0.7 to 1.2 Air-conditioning by gas 0.45 to 0.8 Air-conditioning by electric power/gas 0.45 to 1.0 Cogeneration system 0.5 to 0.8 Projects introduced in this presentation Air-conditioning by electric power (thermal storage) (untapped energy utilized) 0.7 to 1.3 ○ Thermal storage (untapped energy) □ Thermal storage (general) △ Gas (cogeneration) × Gas (general) ● Combined Energy sales (GJ) Source: Heat supply project booklet 2006 Calculated by electricity: 9,760kJ/kWh and city gas: 46.0MJ/m 3 Total energy efficiency = energy sales/primary energy input

23 APEC 2007/1/2922 Challenges in the Utilization of Untapped Energy Sources ■ Technological challenges: ○ Development of affordable untapped energy networking technologies ○ Materialization of network concept and development of utilization technologies ■ Social issues: ○ Incorporation into social system: i.e. getting society to think of waste heat utilization the way people think about recycling their garbage ○ Collaboration with various types of urban infrastructure planners/construction companies ○ Establishment of effective project subsidy schemes and further improvement of government ’ s support Ongoing projects: ・ Project for Supporting New Energy Operators ・ “ Eco-town Networking Project ” ■ Recent developments: ○ New National Energy Strategy (issued May 31, 2006) ・ “ Promotion of Untapped Energy Utilization ”

24 APEC 2007/1/2923 Thank you for your attention! TTS


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