A proposal of Energy Saving in the Power Supply System for Green ilc

• A Proposal of Energy Saving in the Power Supply System for Green ILC

• 　　　　　　　　　　　　　　　　

• Takayuki SAEKI (KEK)

• Yumi NAGAOKA (UNISUN Japan) and

• Tadashi FUJINAWA (RIKEN Nishina Center)

• 26th October 2017

• LCWS2017 at Strasbourg

RIKEN RIBF created the nuclei of element 113, and RIKEN got the naming right of element 113.

• RIKEN RIBF created the nuclei of element 113, and RIKEN got the naming right of element 113.

• Nh(Nihonium)

Motors (Toshiba Co. Ltd.) for cooling water are in high efficiency.

• Motors (Toshiba Co. Ltd.) for cooling water are in high efficiency.

• 　30 kW: 92.62%(High-efficient type), 91.35%(Normal type)

• 55 kW: 94.20%(High-efficient type), 92.30%(Normal type)

• The transformer’s highest efficiency is 99.4％　（1.5 MVA)

Waste Heat Boiler :WHB

• Waste Heat Boiler :WHB

HV / MV substations

• HV / MV substations

• 66 kV/6.6 kV ｘ 7 sets

The ILC-TDR plan is the extension from the scheme in KEK and/or other HEP laboratories, 100 - 500 kV to 66 kV, and 66 kV to 6.6 kV.

• The ILC-TDR plan is the extension from the scheme in KEK and/or other HEP laboratories, 100 - 500 kV to 66 kV, and 66 kV to 6.6 kV.

• But all these transformers have loss in iron and copper.

Currently, two independent power sources are available from Tohoku EPCO at 154 kV.

• Currently, two independent power sources are available from Tohoku EPCO at 154 kV.

• When one fails in an accident, the other will remain operational and it will be switched within 0.06 sec.(3 cycle)

Transformer loss in ILC-TDR:

• Transformer loss in ILC-TDR:

• 2,230 kW (Op) + 808 kW (Maintenance)

• Transformer loss in our proposal for G-ILC:

• 1,200 kW (Op) + 200 kW (M)

• Total difference : 8,280 MWh/year

• Cost difference : 99,360,960 yen /year

• Save in CO2 emission : 632 tons/year

154 kV/66 kV substation should be skipped. We can save energy and cost. We have many track records of 500 kV/6.6 kV substation.

• 154 kV/66 kV substation should be skipped. We can save energy and cost. We have many track records of 500 kV/6.6 kV substation.

• 3 x (154 kV, 60 MVA substation) will be constructed. The number of substations will be less than half.

• The number of transformers will be 3/18.

• Loss of 66 kV cable is larger than that of 154 kV cable.

• The dual power sources from the local power company are available at 154 kV and then the system is reliable.

• CGS is not recommended for ILC. See following slides.

• Also sustainable energy sources are used in parallel. See following slides.

No pipe line for gas at ILC site!

• No pipe line for gas at ILC site!

• 16,000 Nm3/h of fuel (natural gas) for ILC-CGS.

• The COP of the absorption chiller is lower than turbo one. (1.3 vs 6)

• The turbo chiller has increased COP in 15 years. (COP: Coefficient of Performance)

• RIKEN installed the CGS 15 yeas ago. Now the turbo chiller is better than absorption chiller.

Tohoku EPCO reported that solar power output is at maximum in high noon in their territory.

• Tohoku EPCO reported that solar power output is at maximum in high noon in their territory.

• Wind power will be at minimum at 12 o’clock in the day time, so they are complimentary and can cover each other.

The dual power sources at 154 kV are available from the local power company. The system at 154 kV is reliable.

• The dual power sources at 154 kV are available from the local power company. The system at 154 kV is reliable.

• We propose to use the transformer: 154/6.6 kV to reduce the number of substations.

• We can save 8,280 MWh/year (\99,360,960/year), and can save 632 tons/year of CO2 emission.

• Less equipment is good for reliable operation and easy maintenance.

• CGS is not recommended for ILC due to fuel (natural gas) transportation.

• We propose to use sustainable power sources, such as solar and wind energy, as much as possible in parallel.

An absorption refrigerator is a refrigerator that uses a heat source (e.g., solar, kerosene-fueled flame, waste heat from factories or district heating systems) to provide the energy needed to drive the cooling system.

• An absorption refrigerator is a refrigerator that uses a heat source (e.g., solar, kerosene-fueled flame, waste heat from factories or district heating systems) to provide the energy needed to drive the cooling system.

• In the early years of the twentieth century, the vapor absorption cycle using water-ammonia systems was popular and widely used, but after the development of the vapor compression cycle it lost much of its importance because of its low coefficient of performance (about one fifth of that of the vapor compression cycle). Nowadays, the vapor absorption cycle is used only where waste heat is available or where heat is derived from solar collectors. Absorption refrigerators are a popular alternative to regular compressor refrigerators where electricity is unreliable, costly, or unavailable, where noise from the compressor is problematic, or where surplus heat is available (e.g., from turbine exhausts or industrial processes, or from solar plants).