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<br />Roseville Skating Center and City Hall
<br />Feasibility Study September 23, 2007
<br />When fluid in the GHX is circulated through water source heat pumps, thermal energy
<br />can be either extracted to or rejected �ro�� the fluid. When heat is extracted from the fluid
<br />the GHX is an energy source for the heat pumps.
<br />Heat pumps operate at a coefficient of performance (COP) of 3.0 to 4.0 when extracting
<br />thermal energy from fluid that is �2°�. When a heat pump is operating at a COP of 4.0
<br />this means that 1.0 unit of electricity is used to power the equipment and 3.0 units of
<br />thermal energy are extracted from the fluid circulating through the heat pump. Since only
<br />the electricity is purchased and the energy in the GHX is free, each k',�l17 of electricity
<br />produces 4.0 units of thermal energy. If the cost of electricity is $0.064, the cost'of
<br />heating a building is $0.064 f 4.0 �$0.016 per kVllh. In 2006, the cost of natural gas
<br />used on the City Hall Campus averaged $0.0376 per EkWh. The cost of heating a
<br />building with a geothermal system operating at a COP of 4.0 is only $0.016 ($0.0376 x
<br />100 = 42°/o of the cost of heating the building with natural gas.
<br />When the GHX temperature is higher, the heat pump operates at a significantly higher
<br />COP. When the GHX temperature is 60°� to 70°F, a heat pump will operate at a COP as
<br />high as 5.0. This reduces ihr� cost of heating to $0.064 ! 5.0 =$0.013 per kWh. In
<br />comparison to natural gas this provides a saving of $0.013 I$0.0376 x� 40 = 35°/o of the
<br />cost of heating with natural gas.
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<br />5.2. Ex���� Thermal Ener�y at the ice Arena and Banquet Hall
<br />The following graph illustrates the amount of thermal energy dissipated by the
<br />refrigeration plant in the (c� Arena compared to the amount of thermal energy required
<br />for space heating and hot water in the ice Arena I Banquet Hall facility.
<br />GeaXergy Systems Page 15 of 33
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