Poda Punda

1. ERG 211 RENEWABLE ENERGY AND GREEN
TECHNOLOGY (1+1)
Practical - 14
Performance evaluation of solar cooker and
distillation system
Aim: To assess the performance of the solar cooker and
solar distillation system.

2. Performance evaluation of solar cooker & distillation system
Principle:
Solar cookers or distillation system uses solar radiation as
input energy.
Solar radiation is being absorbed as either direct or
reflected radiation and converted into thermal energy.
This heat energy is used to cook food which is kept in the
vessels in a solar cooker.
Similarly, the heat energy is used to evaporate water in
the solar distillation system. The evaporated water gets
condensed and collected as distilled water.

3. Box Type Solar Cooker

4. Performance evaluation of solar cooker
Procedure
1. Weigh the vessel of the solar box type cooker (Note the
material of the vessel).
2. Take known quantity of rice and water in the vessel and
place in the solar cooker under sunlight.
3. Note down the solar radiation, ambient temperature and
initial temperature inside the vessel.
4. Record the temperature inside the vessel at regular
intervals, until the rice gets cooked.
5. Note down the time taken (t) for cooking.

5. Performance evaluation of solar cooker
Observation:
Available solar radiation, SD = W /m2
Length of solar cooker, Lc = m
Breadth of solar cooker, Bc = m
Time taken for cooking, t = h
Mass of vessel, m1 = kg
Mass of rice, m2 = kg
Mass of water, m3 = kg

6. Performance evaluation of solar cooker
Observation:
Temperature difference, dt = Final temperature –
Initial temperature, °C
Specific heat of vessel, Cp1 = kJ /kg °C
Specific heat of rice, Cp2 = kJ /kg °C
Specific heat of water, Cp3 = kJ /kg °C

7. Performance evaluation of solar cooker

8. Problem
Calculate the thermal Efficiency of Solar Cooker from the
following parameters:
Insolation / available sunlight = 740 W/m2
Length and Breadth of solar cooker is 1.25 m and 0.48 m
Time for cooking = 1.45 h
Mass of vessel = 450 g

9. Problem
Mass of Rice = 250 g
Mass of Water = 650 g
Initial Temperature = 320 C;
Final temperature = 1020 C
Specific heat of Aluminium vessel, rice and water is
0.9, 1.11 & 4.184 kj/kg0C respectively.

10. Problem
Solution
Thermal Efficiency of Solar Cooker = 10.275 %

11. Performance evaluation of solar water heater
Problem – 1 - Solution
Thermal Efficiency
[(0.45 x 0.9) + (0.25 x 1.11) + (0.65 x 4.184)] x 70
= x 100 %
(740 x 0.6 x 1.45 x 3600) / 1000 KJd-1
Thermal Efficiency = 10.275 %

12. Performance evaluation of solar distillation

13. Performance evaluation of solar distillation
Procedure
1. Keep known quantity of water to be distilled in the
distillation unit placed under sunlight.
2. Note down the ambient temperature and temperature
inside the distillation unit at regular time interval
3. Collect and measure the quantity of water distilled using
measuring jar and note down the time taken.

14. Performance evaluation of solar distillation
Observation:
Available solar radiation, SD = W m-2
Area of the solar distillation system, AD is = m2
Mass of water, m = kg
Specific heat of water, Cp = kJ kg-1 °C-1
Mass of distilled water, m1 = kg
Latent heat of evaporation of water, Lw = kJ /kg °C
Time taken for distillation, t = h
Temperature difference, dt = Final temp. of water –
Ambient temp., °C

15. Performance evaluation of solar distillation

16. Performance evaluation of solar distillation