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Technical Requirements
Open Source Ecologie team (OSE French chapter) is researching and developping the linear fresnel reflector. These are the requirements we expect from the solar concentrator of this kind, these requirements will
The current work in progress is located here or on the Collaborative pad
you can see 2 columns describing the level required at the 2 different phases of the project, for each requirement we expressed the rate of achievement required.
Phase 1 - Demonstrateur : is the proof of concept that will be presented in the “ Villages des alternatives” in Paris the September 26th 2015 of 4m^2 of mirrors. Phase 2 - Prototype a: is the full scale product that we expect to deliver early 2016 after a crowdfunding campaign launched during the Villages des alternatives. This will be the Alpha prototype.
The French ethercalc version of this work-in-progress product specification requirement is located here
this document is part of the Product Requirement Document
Introduction
Added to this list of specific requirements, the general OSE Specification for product design should be also applied during the conception and design.
After conception and design are completed, a score will be attributed based on the Ose Specifications evaluation Template and its adherence to the below set of requirements.
the discussions can be carried out on the http://forum.osefrance.org/viewforum.php?f=5 open forum
General
| Requirement | Prototype | Demonstrateur |
|---|---|---|
| Linear Fresnel reflector (primary concentration) | Yes | Yes |
| Second stage concentration on the absorber | Optimised CPC | Yes |
| Heat power output | 5 kW | Defined by mirror surface |
| Mirror surface | Defined by power output | 4 m2 |
| Working temperature | 250°C | 140°C |
| Concentrator orientation | both E/W and S/N | E/W |
| DIY friendly (standardisation of pieces, etc.) | Yes | No |
Structure
Structure on the Forum (independant structures : pro: less vibrations, cons: harder to align correctly)
Supporting Structure
| Requirement | Prototype | Demonstrateur |
|---|---|---|
| Independent structures for the primary concentrator and the absorber | yes | Optionally |
| Structure able to hold the weight of the system | yes | yes |
| Structure sufficently rigid to sustain vibrations and impacts | yes | 70% |
| Ground implantation must assure sufficient stability | not required | |
| Easily assembled with modular-easy to transport components | 70% | 70% |
| Structure and design OSE Compatible http://opensourceecology | Yes | Optional |
| Welding | The least possible | The least possible |
| *Configuration E/W: Designed to allow daily full concentration | 1 focal per side | Pivotable tructure |
| Must be designed to reduce any risk concern | 80% | 60% |
| Cost optimized | 80% | 60% |
Discussions will follow to allow modularity of different absorbers, indipendent concentration source, different working Axis
Mirrors Structure
| Requirement | Prototype | Demonstrateur |
|---|---|---|
| Structure of each mirror to avoid deformation due to weight | 100% | |
| Must allow mirrors rotation to follow the sun | 180° | >60° |
| Weather protection | mirror flip | undefined |
| Reclinable support of the mirrors for seasonal optimization | inclination angle = latitude | |
| Easy optical alignment (assured by any mean - ie. Tracks, guidelines, holes, etc) | 100% | 100% |
Optical Concentration
| Prototype | Proof of concept / Demonstrateur | ||||
| Mirror's Geometry to be (to define based on best optical optimization, in progress) | |||||
| Mirrors with high reflectivity (>90% on wide spectrum) | 100% | 100% | |||
| resistant mirrors with high lifespan for external usage. | 100% | 100% | |||
| Mirrors easy to clean | 100% | 70% | |||
| Secondary concentration on the absorber higher than 2x | 100% | 70% | |||
| total factor of concentration 25 | 100% | 70% | |||
| mirrors easy to fix and replace on their support | 100% | 70% | |||
| must be designed to reduce any risk concern | 80% | 60% | |||
| Cost optimized | 80% | 60% | |||
Absorber
| Prototype | Proof of concept / Demonstrateur | ||||
| specially designed for the selected thermal fluid, with passive o | 100% | 100% | |||
| Absorbing material with high optical absorbtion rate on wide spectrum | 100% | 100% | |||
| elevated thermal exchange Absorber / Fluid | 80% | 60% | |||
| high thermal insulation (from external air, from the point of contact with the structure, from IR radiations) | 80% | 60% | |||
| High resistance of thermal variation constraints (high temperatu | 80% | 60% | |||
| Specially designed for the secondary concentrator | 80% | 60% | |||
| must be designed to reduce any risk concern | 80% | 60% | |||
| Cost optimized | 80% | 60% | |||
Motors, Tracker, Programs
| Prototype | Proof of concept / Demonstrateur | ||||
| Must allow for a real time follow & programmed sun follow base | 80% | 60% | |||
| Automatically detect and self protect in case of bad weather | 80% | 60% | |||
| Must be able to track the sun and send the correct angle in order | 80% | 60% | |||
| Must be able to sense temperature and pressure at fluid input a | 80% | 60% | |||
| programmable to stop automatically | 80% | 60% | |||
| must provide an easy GUI control interface (optionally handled t | 80% | ||||
Modelling and studies
| Prototype | Proof of concept / Demonstrateur | ||||
| Optimisation of Solar concentrator design | 80% | 60% | |||
| Self pilot of the solar concentrator (must perform a logical analysis of current solar concentrator of JB) | 80% | 40% | |||
| Tools to predict energetical production based on geography | |||||
| Model of economical and technical conditions for optimal usage of the solar concentrator | |||||
| Finalize localized business case | 80% | 40% | |||
| Identify technical modifications needed to adapt to new usage | 80% | 40% | |||
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