trnsys simulation for solar process heat - reemain
TRANSCRIPT
TRNSYS simulation for solar process heat
a comparison with the REEMAIN tool REEMAIN webinar on the tool for the modelling of
solar concentrators 13th October 2015
Dr. Uli Jakob Johannes Steinbeißer
JER
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 2
• TRNSYS standard library:
– solar systems (ST and PV)
– low energy buildings
– HVAC systems
– weather data
– data handling
– time dependent functions
– …
• TESS library:
– solar systems
– HVAC systems
– high temperature solar systems
– cogeneration
– geothermal
– …
Source: wisc.edu
Source: tess-inc.com
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 3
TRNSYS Deck – Simulation Model [Source: JER]
Type connection, Output Input [Source: JER]
→ aim: validation of the REEMAIN Tool with an example of a solar concentrator system
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 4
TOOL
Source: iesve.com; reemain.eu Source: wisc.edu
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 6
Meteonorm weather data TMY2: Burgos, Spain
Source: JER • Atlantic marine climate • high temperature difference between night and day • temperatures rarely below freezing point
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 7
• high direct radiation (63%) • great potential for solar concentrators
Meteonorm weather data TMY2: Burgos, Spain
Source: JER
Ø
Ø
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 8
• specific design radiation level • radiation bin range of 700 – 800 W/m2
• average daily solar yield: 4.31 kWh/m2
Meteonorm weather data TMY2: Burgos, Spain
Source: JER
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 9
Gullón factory aerial view (Source: teicon.es) • leading Spanish cookies manufacturer
• largest biscuit factory in Spain
• focus on heat recovery and renewable energy
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 10
Source: IES
Source: IES
original heating set-up
integration of solar thermal heat
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 11
Generic System Design
Source: JER
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 12
Source: JER
IES-Data
(REEMAIN Tool)
TMY2
(TRNSYS)
Difference
DNI energy sum 1393.92 kWh/m²a 1745.25 kWh/m²a 351.33 kWh/m²a
DNI peak 948.00 W/m² 1017.00 W/m² 69.00 W/m²
Hours of DNI 3291 h 3590 h 299 h
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 13
Simulation Parameters IES JER
REEMAIN TOOL TRNSYS17
azimuth of collector 90° (E-W) 90° (E-W) reflector (one collector)
length 3.0 m Σ = 126 m²
width 1.0 m focal length 0.3m no value
collector units per row (series) 3 3 number o rows (parallel) 14 14 concentration ratio no value 25 tube extension (one unit) 0.2 m 0.2 m intercept factor 0.990 m no value absorber tube radius 0.018 m no value absorber tube absorptance 0.950 m no value mirror reflectance 0.95 no value cover tube transmittance 0.82 no value total fluid flow 50 l/(h*m²) 50 l/(h*m²) pump power 0.2 kW 720 kJ/h fluid specific heat capacity 4100 J/(kg*K) 4.1 kJ/(kg*K) heat exchanger effectiveness 0.4 0.4 tank volume 5,000 l 5 m³ design tank heat loss 0.007 kWh/(l*day) surf. loss coeff.: 10.8 kJ/(m²*K) system pipes no value 60 m order loss coeff. per unit aperture area
η0 no value 0.7 c1 0.4 W/(m²*K) 1.44 kJ/(m²*K) c2 0.002 W/(m²*K) 0.0072 kJ/(m²*K)
water loop design temperature supply 60 °C dynamic return 30 °C 30 °C
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 14
TRNSYS Simulation Model
Source: JER
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 16
Source: JER
peak loads between 80 kW – 120 kW
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 20
• only small difference between REEMAIN Tool and TRNSYS • peak loads are a little higher in TRNSYS
• annual sum of solar system energy yield 2 MWh higher in the REEMAIN Tool
• main reason for the variances: the two different weather files
Aim:
• analysis of the input potential of solar power into the industry process
• evaluation of the REEMAIN Tool via an adjusted, dynamic TRNSYS system simulation
Results:
• results differ only slightly
• different weather file data influenced the simulation results
• successful validation of the model approach of the REEMAIN tool
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 21
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977
Source: JER (Samuel Baumeister)
Source: Bossa
• Area of about 200,000 m2
• 2,600 employees
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 24
Source: Bossa (Data), JER (Chart)
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 25
Source: JER (Samuel Baumeister) Examples of integration of parabolic trough solar collectors (see also 1st REEMAIN Webinar on the WP3 technology roadmap)
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 26
Source: wisc.edu
Source: JER Source: Solera
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 27
Source: JER • Solar input covers a large amount of energy demand in summer • Total solar coverage ca. 28%
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 28
Source: JER • Solar coverage (parabolic trough collectors) at ca. 28%
Aim:
• analysis of the input potential of solar power into an industry process
• detailed dynamic simulation
Results:
• solar concentrating power can be a very interesting renewable energy technology for process heat in industries
• further case studies for solar process heat and solar cooling will be investigated in the future
REEMAIN: “Resource and Energy Efficient Manufacturing" / 608977 29