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Annual volume of water for geothermal

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Dan E_2
Dan E_2 Member Posts: 1
in THE MAIN WALL
How could one calculate the annual water usage of an open ground source system? The Heat Load @ Design day is 81,382 btuh. The location has a 4882 degree day rating. the heating design temperature difference is 56. The cooling load is 136563 btuh. The degree days for cooling is 1903. The design difference for cooling is 32. My geo unit uses 16 gpm and will deliver 170,400 btuh @ our source water temperature of 60 degrees. @ 16 gpm the unit will deliver 139,800 btuh of cooling @ the source water temperature.
I've done my best to calculate annual usage and am coming up with 365,184,000 gallons per year. YIKES! 7.93 acre feet of water seems high. Is there anyone familiar with these kind of calculations that can confirm or correct my thinking. Thanks in advance.

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  • BC_5
    BC_5 Member Posts: 20
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    Let me try...

    Heating load would be 81,382btuh/56deg*24hrs*4882degdays=170MMbtu/yr. Divide by 170400btu/hr and you get 1000 hours of run time in heating mode. Same thing for cooling yields 1394 hours. So 2394 hours*60min*16gpm gives you 2.3 million gallons. Maybe you misplaced a decimal or something?
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