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General information |
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| Name |
Emmi Dairy Saignelégier
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| Country installed |
Switzerland
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| Address |
Chemin du Finage 19, 2350 Saignelégier, Switzerland
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| Industry sector, NACE code |
C10.5 - Manufacture of dairy products
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| Solar thermal system owner / operator |
Emmi AG, Fromagerie Tête de Moine
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| Solar thermal engineering company |
NEP Solar AG
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| Process integration engineering company |
D. Jaquier Sàrl
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| Year of operation start |
2012
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Technical parameters |
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| Collector technology |
parabolic trough collector
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| Collector name |
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| Installed collector area (gross), m² |
627.0
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| Installed collector area (aperture), m² |
627.0
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| Installed collector area (absorber), m² |
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| Installed thermal power (actual), kWth |
360.0
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| Solar collector loop heat transfer fluid |
water/glycol
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| Solar energy storage |
short-term water storage
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| Storage volume, m³ |
15.0
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| Kind of conventional heat source |
hot water boiler
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| Kind of fuel used |
fuel oil
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Process |
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| Solar thermal energy used for |
Steam for different dairy processes
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| Unit operation |
general process heating
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| Point of Solar Heat Integration |
A3) Heating of supply heat storage
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| --> Integration how and where |
Solar heat is transferred via 360kW heat plate heat exchanger and then to either of two integration points: (a) To supply side (A3), into existing 15m3 supply heat storage as long as storage remains above 25% charged (boiler switched off) (b) To return line to hot water boiler when storage goes below 25% solar and boiler is switched on.
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| --> Temperature range process |
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| --> Temperature range solar loop (min/max), C° |
140 - 180
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Economic parameters |
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| Total investment costs (excl. VAT), € |
300,000.00
(Turnkey costs including solar collectors, piping, support construction, storage, design, commissioning reduced with subsidies)
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| Solar loop (excl. VAT), € |
315000.0
(Solar collectors, piping, support construction)
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| Solar energy storage (excl. VAT), € |
0.0
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| Others (excl. VAT), € |
156000.0
(Design, commissioning, others)
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| Process integration (excl. VAT), € |
129000.0
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| Subsidy, € or % of total investment costs |
Approx.. 200k€ from Swiss Federal Office of Energy Approx. 100k€ from Kanton Jura (not exactly disclosed)
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| Cost for fuel replaced, €/MWhfuel |
Not exactly known. Cost of fuel approx. 80€/MWh, cost of heat approx. 100€/MWh
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| Calculated solar thermal system life time, a |
20
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| Annual useful solar heat delivery, MWh/a |
255.0
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| Specific annual useful solar heat delivery, MWh/am² |
0.41
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| Specific investment costs, €/m² |
478.47
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| Solar fraction, % |
15
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Lessons learned |
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| Initiative |
NEP Solar, through industry network EnAW (www.enaw.ch)
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| Integration methodology |
Simplicity, low cost, maximum use of available solar heat.
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| Crucial Interfaces |
- Building interface (foundations, integration into roof structure)
- Control interface with fossil boiler. Optimization of boiler start-up to achieve maximum solar fraction. Design of hydraulic circuit and integration.
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| Construction / Commissioning |
- Construction: Simplicity of installation of solar collectors is challenge (collector design, logistics, site organization)
- Commissioning: Collector field control is main challenge. Must be non-attended, fully automatic, robust and reliable, but safe (wind, overheat, hail, etc.)
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| Operation / Performance |
- Performance meets expectations
- Problems with very narrow supply temperature setpoint range (supply T must be between 110 and 120°C) and strongly variable return
temperature. This is still being optimized.
- 17 parabolic trough collectors are all in parallel, NOT in Tichelmann arrangement but with manual balancing valves. Significant differences (flow imbalance) remain, leading to up to 15K temperature differences between collector outlets.
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| Recommendations |
- Allow sufficient tolerance for supply temperature
- Tichelmann connection of solar collectors
- Higher range of controllable flow in solar circuit (here 6-15m3/h, would be preferable to have 6-24 m3/h)
- Dedicated solar storage to have a more damped system
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SHIP Plants
