DATE: 15/02/2022
PROBLEM : Effect of dust on the ability to heat water.
We collect the dust on solar water heater for maintenance of solar water heater. Firstly we wiped the evacuated tube with clean damp cloth and after the dust settled in the water we filtered the water with filter paper then put the filter paper for sun drying for two hours and weighed the dust.
Here ,
1) A = Solar water heater on Meditation hall
We know ,
Wt. of filter paper 1= P1=2.78gm
Wt. of filter paper 1 with dust = 4.51gm
Wt. of dust on 10 pipes of A= 4.51 – P1 = 4.51 – 2.78 = 1.73gm
Therefore,
Wt. of dust on A solar water heater = (1.73*32) / 10 =5.53gm
2) B = Solar water heater on Boys hostel
We know
Wt. of filter paper 2= P2 = 2.98gm
Wt. of filter paper 2 with dust = 3.93gm
Wt. of dust on 5 pipes of B = 3.93 – P2 = 3.93 – 2.89 = 1.04
Therefore,
Wt. of dust on B solar water heater = (1.04*32) / 5 = 6.65gm
3) C =Solar water heater on DBRT boys hostel
Wt. of filter paper 3=P3=1.31gm
Wt. of filter paper 3 with dust =2.16gm
Wt. of dust on 5 pipes C = 2.16 – P3 =2.16 – 1.31 = 0.85gm
Therefore,
Wt. of dust on C solar water heater = (0.85*32) / 5 = 5.44gm
4) D = Solar water heater in Technopark
we know,
Wt. of filter paper 4=P4=1.33gm
Wt. of filter paper 4 with dust=2.31gm
Wt. of dust on 5 pipes of D= 2.32 – P4 = 2.31 – 1.33 = 0.98gm
Therefore,
Wt. of dust on D solar water heater = (0.98*32) / 5 = 6.27gm
RESULT :
Your solar water heater will perform optimally if it is cleaned regularly. When a dust accumulates on solar collector their efficiency reduced very speedily as temperature increases due to decreasing of the solar irradiation that absorbed by the solar collector.
