1. > SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions from Experience
Lisa Willwerth
Co-Authors: Michael Berger, Marwan Mokhtar, Dirk Krüger, Christian Zahler

2. Solar Field at RAMPharma, Amman
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Solar Field at RAMPharma, Amman
Solar field: linear Fresnel collectors of Industrial Solar GmbH
Supply of saturated steam at 6 bar gauge
Start of operation: March 2015
Solar field
394 m²
Steam drum 2 m³
Collector field and steam drum with piping to steam network

3. Solar Field at RAMPharma, Amman
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Solar Field at RAMPharma, Amman
< 14
General design

4. Experience of Operation
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Experience of Operation
fossil Energy 830 kWh
solar Energy 860 kWh
~ 50% fossil fuel saving
13th of July 2016

5. Experience of Operation
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Experience of Operation
Reliable operation
No negative interference with conventional steam supply
Solar field can provide more stable pressure than fossil boiler
SD function as Ruths storage works well and supplies steam in a pressure range from 7 barg to 14 barg

6. Measured and Calculated Steam Drum Level
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Measured and Calculated Steam Drum Level
13th of July 2016

7. Flow Meter Measurement Uncertainties
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Flow Meter Measurement Uncertainties
13th of July 2016

8. Changes in the Steam Drum Level
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Changes in the Steam Drum Level
13th of July 2016

9. Changes in the Steam Drum Level for 9 random days
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Changes in the Steam Drum Level for 9 random days

10. Causes for Increase and Decrease in Steam Drum Level
> SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Causes for Increase and Decrease in Steam Drum Level
Level Increase
Level Decrease
Feed water increases water mass
Steam flow to the consumer reduces water mass
Evaporation in the solar field due to an increase in power, temperature and pressure
Condensation in the solar field due to a decrease in power, temperature and pressure
Flash evaporation in the solar field due to an (increased) opening of V01 and a related pressure drop
Collapse of the steam bubble in the solar field due to the decrease in temperature caused by evaporation, or due to an increase in pressure without an increase in power.
Shrink and swell effect due to flash evaporation in the steam drum due to opening of V01 and a related pressure drop
The feed water mass flow cools down the solar field and stops evaporation.
Thermal Expansion in the liquid water due to temperature increase
Temperature decrease causes liquid water volume to shrink

11. > SolarPACES 2017 > Lisa Willwerth • Volume Change in DSG-Solarfield and Steam Drum due to Changes in Evaporation Conditions > 28th Sept. 2017
Conclusion
Solar DSG in most situations provides stable pressure to industrial processes
A big steam drum stabilizes DSG and serves as Ruths storage
Over the day steam drum level changes several times in the scale of solar field volume (~250 Liter) due to water volume changes during evaporation and condensation
The RamPHARMA steam drum of
2000 liter is big enough to have no
problem with these volume changes
A table of causes for increasing or
decreasing water volume was compiled.