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Table 3 - Page 2 T-e C. Circulating surface waters (lake, pored or pool) through heat pump 0. Water to water heat pups - usually Involves relatively warm supply water exposed to a closed loop of water t. Closed loop water to air systems Advantages non -consumptive use of waters can use polluted waters such as abandoned mine pools lessens problems caused by corrosion, sraling and pipe clogging prevents freon from escaping Into the supply water non -consumptive use of water dues not affect the water quality of the aquifer 1) earth-couppied plastic pipes burled In the ground - preferably under a septic tank 2) serpentine cull placed in a - can be very economical pond, tool or surface stream l) closed loop placed down a - does not require the use of a large vertical well land surface Disadvantages - may negatively effect aquatic life - may require a filtering system to eliminate the clogging of pipes - water source has to be large enough (500 sq. ft.. 10 ft. deep) usually wuch less efficient than conventional systems or d u ecl heat applications gray need a large amount of piping in severe winter cllwmtes and thus be more expensive than other systews may require a large amount of land requires excavation of land requires access to water source large trough (or thermal storar)e noels a relatively deep well ( 200 ft. or more) 41 closed loop connected to a saves on pumping costs requires the excavation of land series of large ( 1000 gallons) can provide w—e efficient thermal underground storage tanks storage than . tlrcoupled %ystem 5) series solar heat pump systewr ran Increase the terprerature of water and rxrt well established yet laws fwu rease efficlency requires a heat pump with good high temperature per- formance high rrpitai inves Dent