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Ceci est une ancienne révision du document !


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

General on the Forum

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 structure | | Must be designed to reduce any risk concern | 80% | 60% | | Cost optimized | 80% | 60% | Discussions will follow to allow different absorbers (modularity) or indipendent concentration source or different orientation

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

Optical concentration

Prototype A size 1 Solar concentrator 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

Absorber

Prototype A size 1 Solar concentrator Proof of concept / Demonstrateur
specially designed for the selected thermal fluid, with passive or forced circulation 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 temperature and valiration, high pressure and variation, thermal expansions and contractions) 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

Motors, trackers, programs

Prototype A size 1 Solar concentrator Proof of concept / Demonstrateur
Must allow for a real time follow & programmed sun follow based on Lat/long 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 to optimize concentration 80% 60%
Must be able to sense temperature and pressure at fluid input and output 80% 60%
programmable to stop automatically 80% 60%
must provide an easy GUI control interface (optionally handled through cloud, with data collection) 80%

Modelling and studies

Modeling and studies

Prototype A size 1 Solar concentrator 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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