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'I <br />� <br />� <br />� <br />� <br />� <br />�] <br />1 L� <br />�� <br />7� <br />1� <br />�� <br />7� <br />1� <br />1� <br />7� <br />1� <br />�� <br />�� � <br />LL <br />�� <br />�� <br />�� <br />�� <br />�t <br />�� <br />�� <br />�� <br />�� <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. <br />� � �- � � � _' . �_�„� •J.: ��s (• � �.: �;: �.=i' . �,.-� <br />•• •^�' , L`�{�� �._ � T �` ��: •. n � .'� - - .. � • ' , ' � . <br />' S'61'� � • � • dF' . <br />�` .� �±� <br />. . ; � • : " ��_�. �+�..r .. I��� �r' � - �'�� � �� _ ,� � L�._ ��; � <br />..�.� . <br />i���.�t•.-,�' •' �*���'4 ti •�+ , r � ' �: . y• <br />L ! � . Fii�,. _i <br />} :�F` •• �� ~ � .�� �~ } � 1 } � I F � � . � � � �• • � k • � <br />' . � #' � '� � i i . <br />'� } }�f . .� • � <br />Lr��r}_ , .. rF . i �ti yF.�.:'� i: .a •�r + � �t �•r_ . .. , {�4 <br />_ _�. ��j . . _ ;. . �. _ . � ._. . <br />_ } �{ � ` ` •; � ` + i . ii f� � i' 'r ��Jli �� S . �' �� r <br />i+� 1 r'`r rr;" '' � ' �' i " <br />.� k • . �t ,,. ,,�:� � �'F; , •�• . Gy,� '� ��,.'�r �i ..y'�� <br />���� '.��i . � .��.•��+:y�,�.f I �* I �� s-.. , 7.' _,.J`, } <br />a � ��'••r. 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I� <br />, �' f � . . i L- . .•• �, ' -:y. � ...r ' '. . . •'� <br />�. � , . . , . . • - • -- � ;•�' � : . . ��j � <br />y' �'� ; �, '•'�'•;�' �� y� •£r �.� _ .. _: � <br />'•�-'Y'�'ti 4_ . . y_- . • . • •,.ti. . . _ :� . <br />r �.��F�. �Fy . `� ' ,�� �k4 } '' :�1;: ��� r� ' • - 'hO��Rt��� �FIkS �L'I'• �}��� t}' . ' � i <br />�••w„`•�.� �:: 'v�:�.� . ��.� ' �:. :Il��.ti•�. ..k:',.L�� _. _r" '�.a���� + ti <br />.. j�.. - — ----�.�:'��'c. ��..: �''::_�°� � . . -_.'. � •----• --•- � -�.' � . � <br />- . arv.��-�aa� �r�a�a• — •�aa����t�� . . �, a•• Y � �_'__ _M1.r .y . . <br />• , . . ra � • • � . � . � . ' � � ��i��i�� . . .... . . � <br />•, ��. � - � . <br />�___ ,. '. . , , 5 <br />—zt��� r^�T�JF+�+�Y • t �i • va. �^ _ .•. • '���a-^ I4�4 i� _ __ 4 <br />+�� • � �9--�� <br />. �. �_"w__' _ .. � . " "_ ". . _.. • � � • • •• k . _"_ _" . r. <br />Y .r4 ��Y7rM1;YFt• <br />. . . .. .. _� . __ _ ' <br />• <br />.._. <br />. . _. ... .._. <br />- _ •, _ � , ,'... _1r � __.,�- • •_ . .. �:_:'_'_: ' . _ �v _ : J�' r. �_.7SR���:` . + � <br />�I�;!!� t� � ]. � ��'S :d� }r; _�; � }ri�j��'��rv� J f •:Jr!i� f�!:li �IfL��I �l l 44����t ��!' I ��� i\1f2fIL��r3� f.`Jf c� :'r}�� �Cn � �I��� ':cJi i <br />be consfrucfed <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 <br />