1. S OLAR H OUSE E XTERNAL H EAT E XCHANGER Ryan Diana Marcel Padilla Javier Rojas Shiv Shah Faculty Advisor: Dr. Yong X. Tao

2. I NTRODUCTION Solar energy is the most abundant power source on the planet. Miami receives close to 1 kW per cubic meter year round. Hard to exploit Commercial PV cells are approx. 20% to 30% efficient Current water heating systems are expensive and complicated

3. G OAL To create an inexpensive, effective, and solar heating and cooling system Uses common building materials Integrates into already existing Solar House architecture Does not block roof solar panels Heats ambient water to between 110ºF and 120ºF Keeps the back wall of the solar house walls near ambient temperature Reduce direct sunlight exposure

4. C URRENT SYSTEMS Passive Systems Do not require a pump Less expensive Active Systems Require a pump and valves More efficient Open loop system – Circulates heated water directly to the storage tank. Closed loop System – transfers energy to the water through heat exchangers.

5. T YPES OF COLLECTORS Flat plate collectors Easy to manufacture Efficient in areas with abundant sunlight. Evacuated tube collector Expensive – complex manufacturing process Works in slight overcast conditions Solar tanks Easy to implement Inefficient

6. P OTENTIAL DESIGN Active open loop Flat plate Heated pipe structure Pipe orientation not yet finalized Angled structure to improve energy collection Closed with a transparent material

7. D ESIGN O PTIMIZATION Pipe material (Copper or PVC) Analyze to effectiveness vs. cost Pipe diameter Most efficient to lower pipe friction Pipe arrangement Best arrangement to capture as much solar energy with the least pipe resistance Parallel, serial, mesh, coil shapes Reflective vs. opaque background

8. T IME TABLE

9. S UMMARY We are creating an inexpensive and effective solar heating/cooling system for the Solar House We are currently considering various design options Preparing our initial computational analysis Prototyping to begin this summer Proceeding as planned