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L'EauTech is a project run by six students from the Ecole Centrale de Lille in collaboration with the Gold Of Bengal association.
The aim of the project is to build a low-tech solar watermaker, based on two projects already carried out at the Ecole Centrale de Lille: the Opensol project, which created a low-tech solar concentrator, and the Delta project, which created a low-tech watermaker.
2mm-thick stainless steel sheet measuring at least 200x2100mm
2.2.2. Copper pipe
14mm diameter copper tube 2,5m long
2.2.2.1. Copper condensing coil
2.2.2.2. Copper water inlet pipe
2.2.2.3. Copper water outlet pipe
2.2.3. Cover
8 screws 6mm diameter with washers and nuts
2mm thick stainless steel sheet: 250x250mm
3. Total circuit
3.1 Circuit-closing pipes
20 rubber seals
Valve
5 flexible tubes 1m or 50 cm to close the circuit
Any fittings
3.2. Pump
Oil pump
Vegetable oil
Outils
Screws
Drills
Saw
Scissors
Measuring tape
Wood glue
Strong glue for all materials
Pencil
Screwdrivers
Welding machine
Hacksaw
Étape 1 - Nomenclature
1 Solar concentrator
1.1 Frame
1.2 Main reflector
1.2.1 Support for main reflector
1.2.2 Mirrors
1.3 Secondary reflector
1.3.1 Support for secondary reflector
1.3.2 Secondary reflector and copper pipe
2 Watermaker
2.1 Evaporation tank
2.1.1 Frame
2.1.2 Stages
2.1.3 Copper pipe
2.2 Condensation tank
2.2.1 Frame
2.2.2 Copper pipes
2.2.2.1 Copper condensing coil
2.2.2.2 Copper water inlet pipe
2.2.2.3 Copper water outlet pipe
2.2.3 Cover
3 Total circuit
3.1 Circuit closing pipes4
3.2 Pump
Étape 2 - General operating principle
The system can be split into two sub-systems: the solar concentrator 1 and the watermaker 2.
In the solar concentrator 1, the sun's rays are reflected by the main reflector 1.2 and the secondary reflector 1.3 towards a copper tube 1.3.2 in which a heat transfer fluid (oil) circulates. This fluid is then heated until it boils. It circulates in a closed circuit thanks to a pump 3.2.
This circuit goes through an evaporation tank 2.1 filled with dirty water, which is heated to boiling point by the heat transfer fluid. This water vapour then goes through two successive distillation stages 2.1.2 in the evaporation tank 2.1, before reaching the condensation tank 2.2 in which the water vapour is condensed by a coil 2.2.2.1 through which it travels before emerging as clean liquid water.
Étape 3 - Solar concentrator 1 - Presentation
Name of the different parts of the solar concentrator 1
Material: wood
Copper tubes
Mirrors (or aluminium plates)
Étape 4 - Solar concentrator 1 - Main reflector 1.2 - Step 1
Step 1: Frame 1.1
Cut the frame 1.1 out of the strong wooden board: 1mx2m
Étape 5 - Solar concentrator 1 - Main reflector 1.2 - Step 2
Step 2: Main reflector brackets 1.2.1
Cut out the 3 1.2.1 supports for the main reflector using wooden planks.
For the parabolic shape: see dimensions in the table.
Étape 6 - Solar concentrator 1 - Main reflector 1.2 - Step 3
Step 3: Mirrors 1.2.2
Main reflector 1.2: cut the mirror plates 1.2.2 into rectangular shapes (dimensions from previous table).
Fix the plates 1.2.2 with glue to the support 1.2.1 and check that they are correctly oriented: the sun's rays should converge towards a pipe located at a height of 80cm.
Note: The 1.2.2 mirror can be replaced by an aluminium plate that can be covered with self-adhesive mirror.
Étape 7 - Solar concentrator 1 - Pipe support 1.3.1 - Step 1
Step 1: Cutting the battens
Cut the battens into four pieces approximately 65 cm long.
Cut inclined planes at the end of the 4 pieces so that they can be glued together 2 by 2 (see photo). After gluing, the top should be 80cm above the frame.
Cut other inclined surfaces on the other side of the 4 pieces so that they can be fixed to the 1.1 frame.
Étape 8 - Solar concentrator 1 - Pipe support 1.3.1 - Step 2
Step 2: Secondary reflector support 1.3.1 and clamps
Grind the cut surfaces to make the glue more effective.
Glue the cleats C from the previous step in pairs. Board B must be 80cm above the frame.
Screw the two boards B to the battens C (see photo) using the clamp support A.
Étape 9 - Solar concentrator 1 - Pipe support 1.3.1 - Step 4
Step 4: Consolidation
Using the off-cuts of battens, cut pieces and glue them to the supports, taking care to sand them as before, so as to consolidate the structure.
Étape 10 - Solar concentrator 1 - Pipe support 1.3.1 - Step 5
Step 5: Screwing
All that remains is to screw the two pieces of the pipe support structure 1.3.1 to the frame 1.1 from underneath the structure.
The secondary reflector 1.3 reflects light rays not intercepted by the copper tube 1.3.2 back onto it. It is located above the tube 1.3.2.
Étape 12 - Solar concentrator 1 - Main reflector 1.3 - Step 1
Step 1: Cutting the PVC pipe
The PVC tube is what supports the secondary reflector 1.3. It holds the soda cans that reflect the light rays.
Cut the PVC pipe in half lengthways.
Colour the outside of the PVC pipe black with paint.
Étape 13 - Solar concentrator 1 - Main reflector 1.3 - Step 2
Step 2: Cutting and gluing the cans
As the cans are made of aluminium, the inside of the can proved to be a good alternative for reflecting light rays.
Cut the cans into rectangles 9cm wide, there are no length constraints for the other sides.
Fold in half widthways to make two parts 4.5cm wide.
Glue the cans into the PVC tube (they will have a rounded W shape) using strong glue.
Note: you can stick self-adhesive mirrors in the cans to improve reflection.
Étape 14 - Watermaker 2 - Presentation
Name of the different parts of the watermaker 2
Material: steel
Copper tubes
The condensation tank 2.2 is used to store brackish water before the evaporation tank 2.1. In this tank, the steam created by the evaporation tank 2.1 circulates in a coil 2.2.2.1.
The evaporation vat 2.1, consisting of 2 stages 2.1.2, is used to convert brackish water into steam. The vapour created circulates through a coil 2.2.2.1 in the condensation tank 2.2 in order to cool it and convert it into a liquid state.
Add material by welding to the side walls of vat 2.1 so that the trays can be placed on them (see photo for the height of the 2 trays and therefore the height of the 2 additions of material).
Drill 5 cm diameter holes at one end of each tray (so that steam can circulate through all the levels) and place the 2 trays in vat 2.1 with their holes located at opposite ends.
A water inlet hole from the storage tank, which accommodates a flow regulator (such as a flush valve for autonomous use, but a simple manual valve may suffice). This hole should be at the top of the tank. The 2.2.2.2 pipe passes through it.
An outlet hole for brackish water preheated by steam condensation, at the bottom of tank 2.2, towards evaporation tank 2.1. Pipe 2.2.2.3 passes through.
A steam inlet hole from the evaporation tank 2.1 (condensation coil inlet 2.2.2.1), located below the water level in tank 2.2.
A drinking water outlet hole (condensing coil outlet 2.2.2.1), lower than the previous hole.
Note: these holes must be made in relation to the other parts of the prototype (particularly for the condensation coil 2.2.2.1 where it is advisable to manufacture it before drilling the holes: see next step).
See image where the brackish water outlet hole is not shown (water inlet: top right and the 2 ends of the condensing coil 2.2.2.1 are top left and bottom right).
Step 3: Condensing coil 2.2.2.1 (where the steam condenses)
Surround the copper tube 2.2.2.1 with a rigid spring (to obtain a circular shape).
If the copper is not annealed, heat it to a red colour and immerse it in cold water immediately.
Then give it a helical shape by gradually winding it around a cylinder.
Insert the coil 2.2.2.1 into the tank 2.2 through the 2 holes previously made.
Étape 21 - Dessalinisateur 2 - Cuve de condensation 2.2 - Etape 4
Etape 4: Couvercle 2.3 de la cuve 2.2
Percer au moins 8 trous sur les rebords de la cuve 2.2 pour les vis qui fixeront le couvercle 2.3.
Découper une tôle carré de 250x250mm qui fera office de couvercle 2.3 et y percer au moins 8 trous correspondants aux précédents afin de pouvoir visser ce couvercle;
Une chambre à air de vélo peut être insérée entre les rebords de la cuve 2.2 et le couvercle 2.3 pour une meilleure étanchéité.
Étape 22 - Circuit total 3
Les deux parties principales étant construites, il ne reste plus qu’à fermer le circuit où circulera le fluide caloporteur ! Ce fluide caloporteur est une huile végétale qui circulera grâce à la pompe 3.2 intégrée au circuit. Privilégier des tuyaux 3.1 bien isolés thermiquement (isoler soi-même au besoin), flexibles (pour pouvoir déplacer facilement le prototype).
Étape 23 - Pompe 3.2
Pour le choix de la pompe 3.2, il faut bien faire attention à utiliser une pompe à huile. Une telle pompe peut être une pompe de récupération et peut se trouver sur des motos ou des voitures ou toute autre machine dont le fonctionnement nécessite une pompe à huile.
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