1. Geothermal Exchange Heat Pumps Jordan Harris 4M-C

2. Objectives What is a HEAT PUMP? What is Geothermal exchange? Air vs. water Closed vs. open system Heating and cooling mode Sources

3. What is a heat pump Moves heat rather than burning a fuel Opposite of Air conditioning Removes heat from source to deliver to desired heating area Fluid expanded, forcibly condensed to release heat, gains more

4. What is Geothermal Exchange Using the Earth as a heat source or a heat sink Consists of a loop of pipe, a compressor, and a pump Pipe is installed below the frost line Ideal, temperatures below ground are fairly constant 70% of energy used is renewable energy from the ground

5. Air vs. Water Traditional air conditioning uses air as a medium Geothermal exchange pumps use water Water can store 3472 times more heat than air Water requires less energy to move, One cubic foot of water 3472 cubic feet of air

6. Open vs. Closed Loops Open –Loop between a water source and a discharge area –Higher performance –Water needs to be analyzed and treated (for corrosives, acid, abrasives) –Cost of pumping is higher

7. Open vs. Closed Loops Closed –Water is re-circulated –No new water is introduced –Heat is transferred through the walls of pipe –High installation cost, low pumping cost

8. Heating and Cooling Heating –Fluid is drawn from the earth - is expanded to vapour in heat exchanger – forced to compress in compressor releases heat – returned to earth Cooling –Opposite.

9. Sources http://www.geothermalheatpump.com/h ow.htmhttp://www.geothermalheatpump.com/h ow.htm http://en.wikipedia.org/wiki/Geothermal _exchange_heat_pumphttp://en.wikipedia.org/wiki/Geothermal _exchange_heat_pump http://home.howstuffworks.com/questio n49.htmhttp://home.howstuffworks.com/questio n49.htm http://home.howstuffworks.com/ac.htm