(16/02/2022)
Why calculate the efficiency of solar water heaters ?
Solar water heater are expensive and Evacuated tube collectors absorb most of the heat from the sun but it is only used it to heat water temp 50 to 60°C then we want to see where else it can be used. eg. dryer
EMPATHY:
The first assignment I got to measure the efficiency of solar water heater. Now that we know that is goes to 50 to 60 % from observations, using this energy we have to make a model for drying and put sawdust 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.
Procedure:
- Measuring Temp at 9.00am with help of thermometer.
- Measuring Temp at 3.00pm with help of thermometer.
- Measuring Temp at 5.00pm with help of thermometer.
- Calculate Area of ETC.
- Calculate Energy in 1m²(Solar Irradiation)
- Difference in time
- Efficiency=Output/Input
Taking temperature reading at 9.00Am, 3.00pm, 5.00 Pm for 4days continuously
PROBLEM IDENTIFIED:
Initially we were taking morning and evening temperature readings without draining water.
PROBLEM SOLUTION:
The efficiency on 24th february is higher than 19th and 21st february because we tried to bring the inlet and outlet temperature same.
DBRT boys hostel Date(19/02/2022) (8Houres)
Temp at 9.00Am= 42°C
Temp at 5.00Am= 48°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
12558000
Efficiency=Output/Input
17.52734
Techno park (19/02/2022)
Temp at 9.00Am= 49°C
Temp at 5.00Am= 60°C
Input=Area of ETC×Energy in 1m²×Time
45423936
Output=Capacity of Storage tank×4.186×Diff. in time
11511500
Efficiency=Output/Input
25.34237
DBRT boys hostel Date(21/02/2022) (6hOURES)
Temp at 11.30Am= 41°C
Temp at 5.30Am= 56°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
31395000
Efficiency=Output/Input
50.58476
Techno park (21/02/2022)
Temp at 11.30Am= 55°C
Temp at 5.30Am= 73°C
Input=Area of ETC×Energy in 1m²×Time
39347856
Output=Capacity of Storage tank×4.186×Diff. in time
18837000
Efficiency=Output/Input
47.873
DBRT boys hostel Date(24/02/2022) [6HOURES]
Temp at 9.00Am= 30°C
Temp at 3.00Am= 44°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
29302000
Efficiency=Output/Input
47.21245
Meditation hall (24/02/2022)
Temp at 9.00Am= 26°C
Temp at 3.00Am= 41°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
31395000
Efficiency=Output/Input
50.58476
DBRT boys hostel Date(24/02/2022) [8HOURES]
Temp at 9.00Am= 30°C
Temp at 5.00Am= 48°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
37674000
Efficiency=Output/Input
52.58202092
Meditation hall (24/02/2022)
Temp at 9.00Am= 26°C
Temp at 5.00Am= 46°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
41860000
Efficiency=Output/Input
58.42446769
DBRT boys hostel Date(25/02/2022) [6HOURES]
Temp at 9.00Am= 29°C
Temp at 3.00Am= 45°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
33488000
Efficiency=Output/Input
53.95708
Meditation hall (25/02/2022)
Temp at 9.00Am= 29°C
Temp at 3.00Am= 45°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
33488000
Efficiency=Output/Input
53.95708
DIC BOYS HOATEL (25/02/2022)
Temp at 9.00Am= 29°C
Temp at 3.00Am= 44°C
Input=Area of ETC×Energy in 1m²×Time
62064144
Output=Capacity of Storage tank×4.186×Diff. in time
31395000
Efficiency=Output/Input
50.58476
DBRT boys hostel Date(25/02/2022) [8HOURES]
Temp at 9.00Am= 29°C
Temp at 5.00Am= 50°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
43953000
Efficiency=Output/Input
61.34569107
Meditation hall (25/02/2022)
Temp at 9.00Am= 29°C
Temp at 5.00Am= 50°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
43953000
Efficiency=Output/Input
61.34569107
DIC BOYS HOSTEL (25/02/2022)
Temp at 9.00Am= 29°C
Temp at 5.00Am= 49°C
Input=Area of ETC×Energy in 1m²×Time
71648064
Output=Capacity of Storage tank×4.186×Diff. in time
41860000
Efficiency=Output/Input
58.42446769
Conclusion:
we have to come to the conclusion that we need to drain all water in storage tank completely and the efficiency does not come up until the temperature of inlet and the outlet come together.
Result:
After measuring the efficiency of each day, we find that the efficiency goes up to a maximum 50-70%
