1. Home Energy Solution Arnab Sarkar Chandan Kumar R Dhushyanth Siddharth Bhowmik Institute of Technology-Banaras Hindu University Varanasi-221005

2. The challenge is to design a portable system which produces 20 Wh energy for at least one hour by utilizing the energy wasted in household processes or the energy naturally available to us. Changes shouldn’t interfere with the existing systems. Wasted energy The big idea Electrical power >20 Wh PROBLEM STATEMENT

3. PROPOSED IDEA We plan to use the excess heat dissipated through the sides of a stove to power up our system. It consists of these 3 principal parts: Emitter Emits radiation spectrally matched to the photocell We propose to use Tungsten emitter, matched for GaSb photocell Filter Used to reflect back sub- optimum frequencies We’ll use a dielectric mirror PV The heart of the device that actually converts radiant energy to electricity We shall use a Ga-Sb photocell.

4. NOVELTY OF THE IDEA No such commercial system exists The emphasis on safety is a very big plus point Stress on cost aspects have resulted in us designing a system which is cost-effective The apparatus has been designed in such away that it captures most heat without interfering with cooking process

5. FEASIBILITY OF THE IDEA ( TECHNICAL) The technology to produce such PVs already exists. The system we have designed is simple and light, with minimal circuitry Research into the components, be it emitter, photocell, etc has gained momentum and is likely to continue, yielding better results every year. Feasibility analysis Idea $$$$$ Usage of cooking gas in average Indian home = 3 hours Energy generated in burning gas in 1 hour = 3-6 kWh We assume generated energy = 4.5 kWh Therefore, power generated = 4.5 kW & energy generated = (3*4.5) kWh = 13.5 kWh Energy available for conversion = ((27/100)*13.5) kWh = 3.645 kWh (Since 73% of the power is utilized in cooking and rest 23% is wasted as heat) Power available for conversion = 1.215kW 0.1m 2 for a fuel input 12.3 kW causes 1.5 kW of electrical power output Thus for 0.0785 m 2 for a fuel input 1.215 kW causes energy output = (1.5*0.0787*1.1215/12.3*0.1) = 116 W Thus, energy output = 348 Wh This amount is 17 times the target value of 20Wh

6. TECHNICAL CHALLENGES : (What could go wrong) Advantages Oops! Practical-difficulties may creep in product life severely affected in household operating conditions Air-cooling may be insufficient “A slip between the cup and the lip” Theoretically possible Innovative

7. FEASIBILITY : (COST PROFILE ) Daily electric output =348 Wh Cost of 1 unit electricity=Rs. 5 Per day saving=Rs. 1.74 Annual saving=Rs.635.10 System cost(from market analysis)=Rs.4000 Payback period=6 years 4 months

8. COMMERCIALIZATION PLANS Payback period of 6 years Can be subsidized by Govt. Costs of around Rs 4000 can be achieved Modified for use in rural scenario $

9. CONCLUSIONS We can conclude from above points that cogenrative use of TPV is a very viable idea and it is no longer a question of if but rather a question of when……until then all we can do is put our efforts into it. Acknowledgements: Besides Tim Berners Lee(inventor of WWW), we’d like to thank our teachers and of course our parents for guiding and helping us. But perhaps most important are our friends who helped us out most when we were depressed or unwilling to go any further.