(02/03/2022)
Introduction:
My name is Rohan Chavan, I am the intern in Vigyan Ashram. My department is renewable energy. the first assignment i got was to measure the efficiency of a solar water heater. Now that we know that it is goes to 50 to 60% from observation, using this energy we have to make a model for drying and put different substance in it for observation.
(Lepa has a farmer who dries the chillies in sun which reduces there yield for this we make a dryer using the efficiency of solar water heater so that there product will not decreases. Farmer from MP(Lepa) dry chillies under direct sun. This results in wastage upto 30% .Efficient solar dryer base on vaccume tube is a option. This project is step towards it.)
Ideation:
In brainstorming we decided with different ideas what materials would be needed to make the model and how it would be made.
- First idea is what happens if you put the fan down and what happens if you put the air outlet down?
- Second idea, what would happen if the fan mounted upside and what if the air outlet was put up?
OBJECTIVES:
1.Collect drying data by keeping sawdust.
Process flow diagram: (03/03/2022)
Material flow diagram:
Prototyping: (04/03/2022)
First we take closed chamber (Freezer) and clean it.
after that we found a water pipe in technopark and removing rust by Polish paper.
we then brought the wiremesh for the tray and made the frame to support it. (05/03/2022)
Wiremesh and metal frame are used to make 1st tray.
then installed the tray and water pipe in the chamber and the fan was obtained from the waste material from the computer lab.
(08/03/2022)
During the ideation period we decided to use 2 types of tray for testing.
because we want to see what drying data we get by putting different ingredients in that 2 trays.
Net and wooden frame are used to make the 2nd tray and glue gun is used to glue the net.
Fig. tray making
We then installed valves on the inlet and outlet to turn the water on and off.
Fig. Valve Fitting
Testing (09/03/2022)
On this date we made a prototype and connect to solar water heater at 10:00 Am but there was a problem.
Problem Identified:
- The outlet in the dryer cannot be connected to the solar water heater.
- There was a water leakage problem.
Problem Solution:
- Then we stopped connecting to solar water heater and took 2 bucket and joint to dryer.
- We straightened out the problem of water leakage by applying M seal and Araldite.
Fig. First prototype
(10/03/2022)
Problem Identified:
- In the second test, the electric heater cannot be connected to the extension board because the electric heater is of high voltage and we do not have that voltage board available above the meditation hall.
- We had a 14 Watt submersible Pump but for some reason it didn’t work.
Problem Solution:
- To install the electric heater, we brought an extension pin from outside and attached it to the extension board.
- An 18 Watt submersible pump was available at Vigyan Ashram but it was not fitted with a nozzle. For this, the nozzle of the old damaged pump was installed.
(11/03/2022)
On this date we fixed the problem in the prototype and started drying sawdust in it.
On this 11th march put the sawdust in the dryer to dry and put a sample in the sun.
Conclusion:
- On the 11th march, we noticed that the water in the sawdust in the dryer evaporates 5 to 6 gm in 1 hour and maximum 10gm of water evaporates from tray in 1 hour in the sun.
- The drying percentage in the first tray is 20% after 7hourrs and the drying percentage is 25% after 7 hours. The drying percentage of tray set for sun drying is 61% after 7 hours.
(12/03/2022)
On the 12th march also put the sawdust in the dryer to dry and put a sample in the sun.
Conclusion:
- On the 12th march, we noticed that the water in the sawdust in the dryer evaporates 5 to 6 gm in 1 hour and maximum 10gm of water evaporates from tray in 1 hour in the sun.
- The drying percentage in the first tray is 24% after 7hourrs and the drying percentage is 27% after 7 hours. The drying percentage of tray placed in the sun is 94% after 7 hours.
The water coil is rectangular in shape. Made different parts of water coil to measure the volume.
Volume of 1 water coil= l*b*h
= 40*2*2
=160cm3
volume of 1 water coil is 160cm3
volume of 6 water coil is 160*6= 960cm3
and volume of another coil=l*b*h
=28*2*2
=112cm3
volume of 2 water coil=112*2
=224cm3
Total Volume of water coil=1184cm3
we know that 1cm3=0.001liter
then 1184cm3=1.184liter
The water flows in water coil is=1.184liter
(14/03/2022)
On this date we created a new system to connect the fan to the dryer.
We took a 3.5inch pipe and its cap to attach a fan.
and used Mseal to fill gaps in dryer and pipes.
(16/03/2022)
This day i took the same reading in a different way.
problem identified:
After discussion we will understand that there is no space for air to enter.
Problem solution:
For this we created an air inlet.
Conclusion:
After reading this day, we understood that the higher the contact between air and sawdust, the higher the dryness percentage.
(17/03/2022)
on this day we had a discussion on the problem that occur when testing in a dryer, from which it is understood that after installing a fan, the internal heat transfer can be fast.
(23/03/2022)
on this date i took the same reading but after discussion we understand in our chamber there is no fast heat transfer hence, we took the fan and fit in the dryer on the water coil.
(24/03/2022)
conclusion:
After reading, we realized that the internal heat transfer was increased due to the installation of fan.
(30/03/2022)
brainstorming:
On this day, there was a discussion about the problems in the project and what should be done about it.
The point raised in the discussion are as follows:
- Use IR gun to measure temp of water coil surface.
- Measure the flow rate of Air.
- Measure the flow rate of water.
- Measure the Area of tray.
- Exhaust fan installation.
(31/03/2022)
On march 31, I measured the flow rate of water and measured the flow rate of air.
Flow rate of water= 2 L/m
Flow rate of air= 0
(01/04/2022)
Considering all these points, I took back the same reading on the 1April.
(04/04/2022)
On April 4, About this project discussed with Dr.Arun Dixit and decided to calculate the difference between removing the fan and installing the fan and not turning the water in both readings.
(05/04/2022)
On the 5th we took readings but on that day we took readings by turning off the fan and without turning on the water.
(06/04/2022)
On the 6th we took readings but on that day we started reading only by turning on the fan and without circulating water in the coil.
(08/04/2022)
On April 8, there was a discussion about the project. From my data we measured efficiency of solar dryer it has goes up to 3 to 4%.
(09/04/2022)
Take 15 liters of water in bucket.
On April 9, we took the same readings but measured how much water evaporated while taking these readings.
Conclusion:
From this we learned that 3 liters of water evaporate in 3 hours. Total 6 liter water evaporate in 7 houres.
13/04/2022
On april 12, i worked in the honeycomb structure.
Some students in DIC have developed different sensors for the honey comb structure. may helped them a littal beat for that.
15/04/2022
On this date I calculated efficiency with the help of Dr. Arun Dixit.
17/04/2022
On april 17, after discussion with arun dixit , there was a discussion on what we can do to increase the heat transfer in the dryer.
to do this, you need to close the hole in the dryer, cut in into 4parts, open one part on the first day, open 2parts on the same day and take such readings.
19/04/2022
open 1 part of the foam.
20/04/2022
open two parts of the foam
21/04/2022
open 3 parts of the foam
23/04/2022
open all pipe
Result:
From the data of last 4 days, it is understood that the drying percentage is increases as the diameter of hole increases.
25/04/2022
I took same readings as compared to 19/04/2022 for comparison.
26/04/2022
I took same readings as compared to 20/04/2022 for comparison.
Observations:
- There is not much difference between inner temperature in chamber and atmospheric temperature.
- In 7 hrs 6 litre water evaporated in bucket.
- The drying percentage decreases when the fan is placed outside the chamber and increases when installed inside the chamber.
- There is a difference of 30 to 40% between the drying percentage of the tray placed outside and the tray placed inside the chamber. (From Table No.1)
Result:
There is no heat exchange in chamber, chamber is poor and not much evaporation occurs.
From calculation dryer efficiency is 17.4%.
Conclusion:
When the fan is installed inside the chamber, the efficiency of the dryer increases.
Tips and suggestion:
When making dryer in future, hot water should be circulated under the tray. so more heat will go into the tray and higher drying percentage will be obtained.
Concluding Note:
27/04/2022
After discussion with Dr. Arun dixit and Prasad sir we decided to design a new experiment for my project.
28/04/2022
I draw some sketches of my project.
29/04/2022
I worked on a metal dome dryer.
After Discussion with Dr. Arun Dixit, he asked me to repair a metal dome dryer with Jaydeep.
We straightened a part of the dome dryer using a rubber hammer.
there was a lot of dust on it so we cleaned and I saw what else I could use for my project.
30/04/2022
We took some parts of the workshop for repairs, they are called scrap-stand.
we seperated its wheels.
And I brought a pimp from technopark for my project.
And brought the bucket of G>I sheet where the colour work is done in vigyan ashram.
03/05/2022
I looked at what material would be needed for my project.
- submersible pump
- Aluminium pot
- valves
- bucket lid
- Pipes
- Extension board
06/05/2022
Today I started making dryer.
Created a system to attach 2 bucket with each other.
After fitting the pipe it it fitted with Areldite so that it will fit after 7-8 hours.
07/05/2022
Today we created a tray to put in the dryer.
the tray did not fit easily in it, so a system is created that would give support.
Made a lid of G.I Sheet to cover a Aluminium pot.
9/05/2022
Today we tested the system and we stopped the leakage with the help of MSeal.
10/05/2022
I took readings on my new system.
Weight of tray (11:00Am)
220. 225
(1:00pm)
219. 223
(3:00pm)
217. 220
(5:00pm)
215. 216
Result:
There is water condensation inside the aluminum pot.
Conclusion:
- No evaporation inside the aluminum pot
2. create some air inlet
11/05/2022
We had gone to Shikrapur to fetch the material for the metal dome.
Material list:
Aluminium Sheet.
U bolts.
Black oil paint.
Rivets.
To fill the gap in the dome, aluminum sheet was applied to it and riveting was done to make it joint.
12/05/2022
To fill the gap in the metal dome, put metal putty in it and MSeal in the place where there is more gap and left to dry.
and taking Reading on my new system.
open lid of the bucket.
Weight of tray (11:00Am)
220. 225
(1:00pm)
218 223
(3.00pm)
216 220
(5.00pm)
212 216
13/05/2022
Today we polished the stand with the help of polish wheel.
And the metal dome was polished with the help of polished paper because the metal putti and Mseal should not come outside.
And painted the base plywood of metal dome.
14/05/2022
Today we have given red oxide to the inside of the metal dome with the help of compresser and cover with the masking tape inside.
And black oil paint outside of the metal dome with the help of compresser.
And painted the stand of metal dome dryer by silver colour.
17/05/2022
Calculate how many trays it would take.
Welding a metal dome dryer with L-angle.
Taking a reading on metal dome dryer, polycarbonate dome dryer and flat plate polycarbonate Dryer.
18/05/2022
Today we made sheet cut for tray on plasma cutter.
It was cut with a grinder to bend the cut sheet.
After cutting it, he was bent with a grip and hammer.
After making the tray, metal putti was applied to close the gap and put to try.
19/05/2022
Today we made sheet cut for tray on plasma cutter.
It was cut with a grinder to bend the cut sheet.
After cutting it, he was bent with a grip and hammer.
After making the tray, metal putti was applied to close the gap and put to try.
20/05/2022
Today again I put the sample of sawdust and water in three dome dryers.
and calculating how much water evaporated by weighing each tray after 6 hrs.
