Comparison of Laboratories with respect to emission of CO2 10 9Emission of CO 8 2 7 Total CO2 6 emission tonnes per year 5 Classroom CO2 4 per student 3 2 1 0 Physics Biology Chemistry Computer Name of the Laboratories
OBJECTIVESStudy Solar Reflectance of building coatings.Determine the best material for ourproject.Calculate the reduction ininternal temperature due toreflected heat.Explore into its futureprospects.
HYPOTHESISReflective coatings will reduce internaltemperaturesWill lower the powerconsumption of airconditioners.Implies better energyconservation.Lower Electricity bills.
Apparatus RequiredSpectrophotometer: Is a device which measures the reflectance as a function of the wavelength of light.
Procedure 1. Different samples were tested for their reflectivity in spectrophotometer. Distemper2. These materials were applied on a glass slide and adequate time of 4 to 6 hours was given Interior for them to dry by Paint natural process. Enamel
COATING THE GLASS SLIDES MAKING THE DISTEMPER SOLUTION
Procedure 1. These glass slides were then bound to a frame which was put in the spectrophotometer : Reference Slide Inserted HereSample Slide Inserted Here
RESULT Avg. Reflectance in Reflectance in short Coating visible region(400-700 infrared nm)Distemper 55% 60-65% Interior 70% 70% paint Enamel 55% 70% Barium 92-93% 92-93%Sulphate
Part II: Building The PrototypeA wooden box of size 20”x15”x11” was constructed.Different samples were painted onthe box. PrototypeThe surrounding temperature wasmeasured using clinicalthermometer.The internal temperature wasmeasured with a thermocouple. Observations were made testedfor our hypothesis.
Temperature ObservationsCoating Outdoor Initial Final Difference Temp. Temp Temp in Temp o C (inside) (inside) o C o C o CDistemper 35 35 32.5 1.5 Enamel 35 35 32 2 Interior 35 35 31 2.5 Paint
Coating Reflectance( Drop in %) temp. in VISIBLE INFRARED prototypeDistemper 55 60-65 1.5 Enamel 55 70 2 Interior 70 70 2.5 paint Power Saving Calcula
CONCLUSIONS2.5 21.5 10.5 0 Distemper Enamel Interior paint Temperature drop
CONCLUSIONS FROM THE POWER SAVING CALCULATOR REFLECTANCECOATING TAKEN MONEY POWER CO2 SAVED SAVED SAVED (Kg) (Rs.) (In KW) (0.527*B) BDistemper 60 3251 812.7 428.29 Enamel 65 3560 890.1 469.08 Interior 70 4179 1041 548.60 paint
LimitationsOpposite effect of reflective coatings inwinters.Due to unavailability of most sensitive pairof materials for the thermocouple only steeland constantan could be used.Variables like room dimensions, performanceof the AC, and insulation materials.
FUTURE PROSPECTS Barium Sulphate (pure form) if mixed with paints, increases reflectance. Thermocouple can be made more accurate with Bismuth and antimony which come at the extremes of the thermocouple series. Along with the coatings the effect of thickness of the wall on the indoor temperature can also be tested. Efficiency can be tested against clay, mud, water and other conventional construction materials.