Cryogenik waste heat utilization for DESY and European XFEL 2nd Workshop on Energy for Sustainable...

Cryogenik waste heat utilization for DESY and European XFEL2nd Workshop on Energy for Sustainable Science at Research Infrastructurs

Jens-Peter Jensen, Eva LeisterEnergy for Sustainable ScienceGenf, 24.10.2013

Jens-Peter Jensen, Eva Leister | Energy for Sustainable Science | 24.10.2013 | page 2

DESY campus


DESY premises heat distribution

XFEL cryogenics plant

district heating transfer station

XFEL injector

Heat distribution pipes 110 °C (red)

Heat pipes 80 °C (blue)


Energy foot print of DESY and XFEL

DESY premises in 2015 ff

>Electrical energy: 160 GWh, 25 MW

>Heating energy: 20 GWh, 10 MW

>Dominated by the accelerators and experimental halls

XFEL operation at 10 Hz in 2016 ff

>Electrical energy: 120 GWh, 20 MW

>Heating energy: 10 GWh, 5 MW Schenefeld premises

>Cryogenics electrical energy at 10 Hz: 24 GWh/a

Heating demand is predominant on the Schenefeld and Osdorf premises

XFEL cryogenic plant is on the DESY premises, ex HERA cryogenics plant

>XFEL cryogenics waste heat utilization possible for DESY premises


Cryogenics


Coldbox

Dewar

Subcooler

oilseperatorcompressors

air cooler He preheater

The helium-heater is only used when the subcooler is cooling down or heating up.

Helium

Oil Breox B35

Oil-Helium mixture

6 K

300 K

40°C

75°C

XFELmodulestunnelinjector

Cryogenic Plant Functionality

50°C

heat exchanger

to the heat distribution return pipe


Oilsystem of the XFEL Cryogenic Plant

heat exchanger for cryogenics waste heat utilization air/oil cooler

low pressure compressors


Temperature Plot of the Breox Oil in 2012

average: 70,2 °C

oil temperature of the high pressure compressor in 2012


Heat emission of 1 street of the cryogenic plant in 2012

average value: 823 kW


District heating transfer station

UST 48

UST 8

UST 47

UST 28c

UST 49

UST 72

UST 24UST 30

UST 25b3

UST 25

UST 25c

UST 1d

UST 54

UST 2 UST 1a

UST 7

UST 5

UST 10

UST 16

UST 17

UST 3b

UST 3

UST 80b

UST 62

UST 64

UST 69

UST 67

UST 67-2

UST 67-1

1

8

7

54

3

6

210

11

13

14

15

16

17

18

19 20

21

23242526

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41 42

912

44

UST CFEL

46

UST ZOQ

45

4a

UST CSSB

3a

UST 11a

UST Nanolab

20a

UST FLASHII

UST PXN22

Vattenfall district heat supply

Heat Distribution Sceme of DESY Premises

XFEL cryogenic

UST = heat substation

cuts for calculations

exist access to heat distribution


Simulation Models for MATLAB/Simulink

district heat transfer station heat substation

heat pipes heat exchanger of the cryogenic plant


Classified Heat Load Curve of 2012

1 street of the cryogenic plant

2 streets of the cryogenic plant

DESY heat consumption 2012 20,9 GWh/a


Results of Cryogenic Heat Utilization

1 street 2 streets

heat extraction 4,6 GWh/a 7,0 GWh/a

cost savings1) 228.450 €/a 350.600 €/a

payback period 2) 2,6 a 1,7 a

cash value after 10 years 3) 807.740 € 1.558.298 €

CO2-Emission 4) 1.087 t-CO2/a 1.669 t-CO2/a

1) price for district heat: 0,05 €/kWh2) investment costs: 592 k€3) refunding rate: 10 %4) district heat: 238 g CO2/kWh


Waste Heat Utilization from the XFEL Water Cooling

Pump HouseDESY campus

Pump HouseSchenefeld


cooling towers

klystrons: 7500 kWmagnets: 500 kW

compression chiller

air conditioning: 800 kW electronic racks: 200 kW(water cooled)

heat exchanger heat exchanger

30°C 8°C 20°C 20°C

summer Tair >16°C

winter Tair<16°C

heat exchanger

Water Cooling of XFEL Injector and Main Linac XTL

45°C 14°C 30°C 30°C

18°C28°C

25°C40°C

Electronic rack cooling in winter


District heating transfer station

UST 48

UST 8

UST 47

UST 28c

UST 49

UST 72

UST 24UST 30

UST 25b3

UST 25

UST 25c

UST 1d

UST 54

UST 2 UST 1a

UST 7

UST 5

UST 10

UST 16

UST 17

UST 3b

UST 3

UST 80b

UST 62

UST 64

UST 69

UST 67

UST 67-2

UST 67-1

1

8

7

54

3

6

210

11

13

14

15

16

17

18

19 20

21

23242526

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41 42

912

44

UST CFEL

46

UST ZOQ

45

4a

UST CSSB

3a

UST 11a

UST Nanolab

20a

UST FLASHII

UST PXN22

Vattenfall district heat supply

Heat Distribution Sceme of DESY Premises

XHMP waste heat pump

UST = heat substation

cuts for calculations


Waste Heat Pump Calculation

> Heat pump: 630 kW, Tcond = 85 °C, Tvap = 40 °C

> Heat is transferred into the heat distribution return pipe

> Investment costs are 725 k€

> Without heat utilization from the cryogenics

1 heat pump

heat economy 4,6 GWh/a

cost savings1) 74.300 €/a

payback period 2) 9,8 a

Cash value after 10 years 3) - 270.222 €

CO2-Emission 4) 745 t-CO2/a

1) price for district heating: 0,05 €/kWh electricity: 0,15 €/kWh2) investment costs: 725.000 €3) adequate target rate: 10 %4) district heating: 238 g-CO2/kWh elecricity: 336 g-CO2/kWh


Conclusion

Cooling water waste heat utilization with heat pump

>The most waste heat goes into the cooling water

>The cooling water temperatures are to low for direct transfer into the heat distribution pipes

>One needs a heat pump to boost the temperature

>The savings does not pay back the invest and service costs

and

>The XFEL pump house XHMP is near the cryogenics hall

>The heat pump is in competition with the cryogenics

>This makes it even more uneconomic


Conclusion

XFEL Cryogenic oil waste heat utilization

The utilization of the oil waste heat pays back after 2 – 3 years

Heat pump utilization to boost low temperatures does not pay

Cryogenik waste heat utilization for DESY and European XFEL 2nd Workshop on Energy for Sustainable...

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