1. HEAT RECOVERY SYSTEM CONTROLLER BY Ajeetesh Govrineni

2. OVERVIEW  Simple and Low-Cost  Differential Temperature Controller  Developed for Heat Recovery System

3. DESIGN  Temperature Sensors  Temperature controlled Switch  DC FAN  AA Batteries

4. FUNCTIONALITY  Differential Temperature  Switches Fan on-off  Lasts 26-27 hours

5. MODELS BUILT  Lab Test Model  Field Test Model

6. APPLICATIONS  Heat Recovery System  Grey Water Recovery System  Solar Water Heater

7. FUTURE IMPROVEMENTS  Low-Power Indicator  New design with Micro-controller  Wall plug in model  Rechargeable model

8. COMPETETION COMPARISON

10. REFERENCES  Microchip TC621 datasheet  http://www.solorb.com/elect/solarcirc/diftemp2/ http://www.solorb.com/elect/solarcirc/diftemp2/  http://www.mydtcstore.com/?gclid=CLKs1fzvta4CF SEQNAodsVQMpw http://www.mydtcstore.com/?gclid=CLKs1fzvta4CF SEQNAodsVQMpw  http://www.emersonclimate.com/en- US/products/thermostats/Pages/programmable_u niversal_thermostats.aspx http://www.emersonclimate.com/en- US/products/thermostats/Pages/programmable_u niversal_thermostats.aspx  http://www.wsetech.com/off%20grid%20solarheati ng%20controller.php http://www.wsetech.com/off%20grid%20solarheati ng%20controller.php  http://en.wikipedia.org/wiki/Solar_water_heating http://en.wikipedia.org/wiki/Solar_water_heating